Статті в журналах: "The compensation method of measurement"

1

Zhou, Shichao, Haibin Zhu, Qinwei Ma, and Shaopeng Ma. "Mechanism and Compensation of Measurement Error Induced by Thermal Deformation of Digital Camera in Photo Mechanics." Applied Sciences 10, no. 10 (May 15, 2020): 3422. http://dx.doi.org/10.3390/app10103422.

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A thermal-induced measurement error induced by thermal deformation of digital camera in photo mechanics methods that has the same magnitude of the error as that in the resistance strain measurement method reduces the accuracy of high-precision measurement substantially and must, therefore, be compensated. Starting from the underlying mechanism of a thermal-induced measurement error, we investigated the image error introduced by thermal behaviours of digital cameras widely used in photo mechanics. We experimentally determined the relationships between the thermal behaviours and temperature, derived the relationship between the image error and measurement error of photo mechanics methods, and eventually established a physical model to explain the underlying relationship between the thermal-induced measurement error and temperature. Furthermore, based on the investigation of the underlying mechanism, we introduced three types of temperature compensation methods for photo mechanics, namely the model compensation method, the preheating method, and the compensation specimen method. We experimentally demonstrated the feasibility of these compensation methods. The model compensation method only needs the data regarding the environmental temperature during operation of the digital camera to implement the correction of the measurement results and enhance the measurement accuracy of photo mechanics methods. The preheating method is suitable for indoor photo mechanics measurements wherein the environmental temperature is almost constant, which ensures that the appearance of thermal balance of the digital camera after a period of self-heating. The compensation specimen method reduces the effective resolution of the images and it also requires that the image error forms in the region of tested specimen are the same as that in the region of the compensation specimen.

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2

Yu, Hua. "Short Time Interval Measurement Method Based on Compensation." Applied Mechanics and Materials 608-609 (October 2014): 865–69. http://dx.doi.org/10.4028/www.scientific.net/amm.608-609.865.

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In this paper, we use a compensation method of the measured short interval to improve the measurement accuracy by two groups of multiplex. By using two groups of multi-channel monostable pulse signal as a compensation signal, we respectively compensate time difference between the starting/ending measured short time interval and the reference signal. Pulse width of each compensation signal is uniform increasing and incremental sum is a reference signal cycle. We select the average value of two compensation signals pulse width as the beginning and the end of the time difference when the reference signal value jumps after compensation. Then according to the number of reference signal and two compensation time difference we can obtain measured short time interval. Error analysis and evaluation of uncertainty measurement show that the precision of this method is decided by pulse width increment of adjacent compensation signals. The experimental data shows that the method effectively reduces the measurement error of one reference signal cycle in the measurement of time interval.

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3

Yi, Li, Zheng Yi, Su Xiyu, and Song Lianke. "Birefringence measurement by the self-compensation method." Applied Optics 31, no. 16 (June 1, 1992): 2968. http://dx.doi.org/10.1364/ao.31.002968.

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4

Čeperković, Vladimir, and Vujo Drndarević. "A method for selfcalibration of a magneto-resistive angular position sensor in servo systems." Tehnika 75, no. 4 (2020): 469–76. http://dx.doi.org/10.5937/tehnika2004469c.

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Magneto-resistive and Hall angular position sensors are frequently used in servo systems, due to their reliability, longevity, and tolerance to environmental conditions. In this paper, a measurement error compensation is integrated into the servo system control structure. The compensation consists of two steps: a linear compensation of the magnetic field vector measurement error, and harmonic compensation of the angular position measurement error. The selfcalibration method uses data collected during rotation with maximal speed to identify parameters of the measurement process model. Identification is executed periodically, each time when the shaft makes a full rotation. The least squares method is utilized for identification of the linear compensation parameters, while the average rotational speed is used as an internal reference for the harmonic compensation parameters identification. The method, together with a fast convergence, increases the measurement accuracy by an order of magnitude. Experimentally achieved measurement error is below 0.7°, with residual variance below 0.05°, comparable with sensor differentiability.

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5

Nagy, Csaba, Zalán Biró-Ambrus, and Lőrinc Márton. "Ultrasound-Based Indoor Robot Localization Using Ambient Temperature Compensation." Acta Universitatis Sapientiae Electrical and Mechanical Engineering 8, no. 1 (December 1, 2016): 19–28. http://dx.doi.org/10.1515/auseme-2017-0002.

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AbstractThis paper focuses on the hardware development of an indoor ultrasound based robot localization system. The problems related to the ultrasound based distance measurements are presented and solutions are proposed related to Time of Flight measurements and measurement synchronization. An optimization based compensation method is introduced to attenuate the effect of the ambient temperature on the distance measurement precision. Experimental measurements were performed to analyze the applicability of the developed system and measurement methods.

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6

Rossant, Cyrille, Bertrand Fontaine, Anna K. Magnusson, and Romain Brette. "A calibration-free electrode compensation method." Journal of Neurophysiology 108, no. 9 (November 1, 2012): 2629–39. http://dx.doi.org/10.1152/jn.01122.2011.

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In a single-electrode current-clamp recording, the measured potential includes both the response of the membrane and that of the measuring electrode. The electrode response is traditionally removed using bridge balance, where the response of an ideal resistor representing the electrode is subtracted from the measurement. Because the electrode is not an ideal resistor, this procedure produces capacitive transients in response to fast or discontinuous currents. More sophisticated methods exist, but they all require a preliminary calibration phase, to estimate the properties of the electrode. If these properties change after calibration, the measurements are corrupted. We propose a compensation method that does not require preliminary calibration. Measurements are compensated offline by fitting a model of the neuron and electrode to the trace and subtracting the predicted electrode response. The error criterion is designed to avoid the distortion of compensated traces by spikes. The technique allows electrode properties to be tracked over time and can be extended to arbitrary models of electrode and neuron. We demonstrate the method using biophysical models and whole cell recordings in cortical and brain-stem neurons.

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7

Li, Dong Xia, Ai Min Wang, and Peng Hao Ren. "An Error Compensation Method for Rectangular Window Based on NURBS Reconstruction Theory." Materials Science Forum 917 (March 2018): 284–88. http://dx.doi.org/10.4028/www.scientific.net/msf.917.284.

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Aiming at the error compensation problem for rectangular window, this paper presents a method of compensation for rectangular window based on NURBS (Non-Uniform Rational B-Splines) reconstruction. In the method, the machining surface is digitally obtained by means of on-machine measurement. The measured data are divided into four regions and different error compensation schemes are used for different regions. The adaptive compensation of the machining error calculated based on NURBS reconstruction theory is achieved by modifying the coordinates of the tool point in the cutter location file. The automation of error calculation and compensation is implemented by software development based on Visual Studio 2012. At the end of the paper, a compensating tool path is emulated in VERICUT. The results show our method is feasible.

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8

He Yuhang, 何宇航, 柴立群 Chai Liqun, 陈波 Chen Bo, 李强 Li Qiang, 魏小红 Wei Xiaohong, and 高波 Gao Bo. "Error Compensation Method for Mirror Symmetry Absolute Measurement." Acta Optica Sinica 33, no. 4 (2013): 0412003. http://dx.doi.org/10.3788/aos201333.0412003.

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9

Gu, Tingting, Xiaoming Qian, and Peihuang Lou. "Research on Temperature Compensation Method in Crankshaft Online Measurement System." Applied Sciences 11, no. 16 (August 18, 2021): 7558. http://dx.doi.org/10.3390/app11167558.

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The crankshaft online measurement system has realized the full inspection function with fast beats, at the same time it requires for high-precision measurement. Considering the effect of ambient temperature and temperature changes on measuring machine, the calibration part, the measured crankshaft and displacement sensor, a temperature compensation method is proposed. Firstly, relationship between calibration part and ambient temperature can be get through the zero calibration. Then use the material properties to obtain compensation values of the calibration part and the measured crankshaft part at different temperatures. Finally, the compensation parameters for displacement sensor can be obtained through the BP algorithm. The improved dragonfly algorithm (DA) is used to optimize the parameters of BP neural network algorithm. Experiments verify the effectiveness of IDA-BP for LVDT in temperature compensation. After temperature compensation, the error range of main journal radius is reduced from 0.0156 mm to 0.0028 mm, the residual error decreased from −0.0282 mm~+0.0018 mm to −0.0058 mm~−0.0008 mm. The influence of temperature changes on the measurement is reduced and measurement accuracy is improved through the temperature compensation method. The effectiveness of the method is proved.

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10

Ko, Nak, Seokki Jeong, Suk-seung Hwang, and Jae-Young Pyun. "Attitude Estimation of Underwater Vehicles Using Field Measurements and Bias Compensation." Sensors 19, no. 2 (January 15, 2019): 330. http://dx.doi.org/10.3390/s19020330.

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This paper proposes a method of estimating the attitude of an underwater vehicle. The proposed method uses two field measurements, namely, a gravitational field and a magnetic field represented in terms of vectors in three-dimensional space. In many existing methods that convert the measured field vectors into Euler angles, the yaw accuracy is affected by the uncertainty of the gravitational measurement and by the uncertainty of the magnetic field measurement. Additionally, previous methods have used the magnetic field measurement under the assumption that the magnetic field has only a horizontal component. The proposed method utilizes all field measurement components as they are, without converting them into Euler angles. The bias in the measured magnetic field vector is estimated and compensated to take full advantage of all measured field vector components. Because the proposed method deals with the measured field independently, uncertainties in the measured vectors affect the attitude estimation separately without adding up. The proposed method was tested by conducting navigation experiments with an unmanned underwater vehicle inside test tanks. The results were compared with those obtained by other methods, wherein the Euler angles converted from the measured field vectors were used as measurements.

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11

Madura, Henryk, Mariusz Kastek, Tomasz Sosnowski, and Tomasz Orżanowski. "Pyrometric Method of Temperature Measurement with Compensation for Solar Radiation." Metrology and Measurement Systems 17, no. 1 (January 1, 2010): 77–86. http://dx.doi.org/10.2478/v10178-010-0008-6.

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Pyrometric Method of Temperature Measurement with Compensation for Solar RadiationOutdoor remote temperature measurements in the infrared range can be very inaccurate because of the influence of solar radiation reflected from a measured object. In case of strong directional reflection towards a measuring device, the error rate can easily reach hundreds per cent as the reflected signal adds to the thermal emission of an object. As a result, the measured temperature is much higher than the real one. Error rate depends mainly on the emissivity of an object and intensity of solar radiation. The position of the measuring device with reference to an object and the Sun is also important. The method of compensation of such undesirable influence of solar radiation will be presented. It is based on simultaneous measurements in two different spectral bands, shor-twavelength and long-wavelength ones. The temperature of an object is derived from long-wavelength data only, whereas the short-wavelength band, the corrective one, is used to estimate the solar radiation level. Both bands were selected to achieve proportional changes of the output signal due to solar radiation. Knowing the relation between emissivity and solar radiation levels in both spectral bands, it is possible to reduce the measurement error several times.

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12

Li, Yan, Hao Li, Yifeng Xiao, Le Cao, and Zhan-She Guo. "A Compensation Method for Nonlinear Vibration of Silicon-Micro Resonant Sensor." Sensors 21, no. 7 (April 5, 2021): 2545. http://dx.doi.org/10.3390/s21072545.

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A compensation method for nonlinear vibration of a silicon micro resonant sensor is proposed and evaluated to be effective through simulation and experimental analysis. Firstly, the parameter characterization model of the silicon micro resonant sensor is established, which presents significant nonlinearity because of the nonlinear vibration of the resonant beam. A verification circuit is devised to imitate the nonlinear behavior of the model by matching the simulation measurement error of the frequency offset produced by the circuit block with the theoretical counterparts obtained from the model. Secondly, the principle of measurement error compensation is studied, and the compensation method dealing with nonlinear characteristics of the resonant beam is proposed by introducing a compensation beam and corresponding differential operations. The measurement error, compensation rate, and measurement residual between the two scenarios that use single beam and double beams, respectively, are derived and are compared with their simulation and experimental counterparts. The results coincide with the predicted trend, which verifies the effectiveness of the compensation method.

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13

Sun, Shi Zheng, Dong Lin Peng, and Fang Yan Zheng. "A Novel Compensation Method for Time-Grating Sensor’s Dynamic Measurement Error." Applied Mechanics and Materials 644-650 (September 2014): 1278–81. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.1278.

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In order to improve time-grating sensor’s measurement accuracy, which is influenced by stability of the components, temperature and mechanical processing in precision measuring procedure. A novel compensation method based on Fourier series approach and least square is presented. With this method, the measurement error is separate into a lot of harmonics, and the optimal parameters of compensation are evaluated by least square method. The accuracy analysis certificates that time-grating sensor’s measurement error is reduced from ±14.8′′ to ±2.5′′ by applying the error compensation method, which is compensated about 80% compared with no compensation. Sensor’s accuracy is effectively improved.

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14

Wang, Shih-Ming, Ren-Qi Tu, and Hariyanto Gunawan. "In-Process Error-Matching Measurement and Compensation Method for Complex Mating." Sensors 21, no. 22 (November 18, 2021): 7660. http://dx.doi.org/10.3390/s21227660.

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This study proposed an error-matching measurement and compensation method for curve mating and complex mating. With use of polynomial curve fitting and least squares methods for error analysis, an algorithm for error identification and error compensation were proposed. Furthermore, based on the proposed method, an online error-matching compensation system with an autorevising function module for autogenerating an error-compensated NC program for machining was built. Experimental verification results showed that the proposed method can effectively improve the accuracy of assembly matching. In a curve-type mating experiment, the matching error without compensation was 0.116 mm, and it decreased to 0.048 mm after compensation. The assembly accuracy was improved by 28%. In a complex-type mating experiment, the verification results showed that the error reductions after compensation for three mating shapes (straight line, triangle, and curve shape) were 81%, 87%, and 79%, respectively. It showed that the proposed method can improve the assembly accuracy for complex mating shapes, which would also be improved without losing production efficiency.

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15

Liu, Guang Sheng, and Zhen Zhen Guan. "Research of Interference Field Measurement and Error Compensation for Geomagnetic Navigation." Applied Mechanics and Materials 602-605 (August 2014): 1586–89. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.1586.

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Aiming at removing interference field in the geomagnetic navigation, the technology of interference magnetic field measurement and error compensation are studied. The scheme of error measuring and compensating are designed, the compensation model is established based on the magnetic dipole theory, its calculation method is designed, experiments prove that this technology is of high accuracy and its process is simpler, it provides a new way for eliminating interference in the aeromagnetic survey.

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16

Kocher, Matthias, B. T. Yao, Julietta Weisse, Mathias Rommel, Zong Wei Xu, Tobias Erlbacher, and Anton Bauer. "Determination of Compensation Ratios of Al-Implanted 4H-SiC by TCAD Modelling of TLM Measurements." Materials Science Forum 963 (July 2019): 445–48. http://dx.doi.org/10.4028/www.scientific.net/msf.963.445.

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The prediction of the compensation induced hole concentration reduction in implanted Al regions is a key parameter in developing high power SiC devices. Hall effect measurements are commonly used to determine the compensation ratio of Al implanted regions. Due to the fact that this measurement method is rather complex, an approximate method was developed by using transfer length method structure measurements in combination with a TCAD simulation model. The determined compensation ratios from this work’s simulation and from Hall effect measurements from literature show consistent compensation ratios. Based on this data a fit function was derived which allows for estimating the compensation ratio for a wide Al concentration range.

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17

Motuz, Rastislav, Petr Munster, and Miloslav Filka. "PMD Study & Measurement – Fixed Analyzer Method." Journal of Communications Software and Systems 11, no. 4 (December 22, 2015): 199. http://dx.doi.org/10.24138/jcomss.v11i4.98.

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The paper theoretically describes Polarization Mode Dispersion (PMD) which is important parameter in high-speed optical networks. Furthermore, compensation methods and measurement principles are presented. Main attention is given to Fixed Analyzer (FA) method that uses common research laboratory equipment in setup. We performed practical measurement of the PMD by using Optical Spectrum Analyzer (OSA) Anritsu MS9740A, in-line polarizers and a polarization controller. To verify the accuracy of measurements Reference Measurement (RM) using a modular platform EXFO FTB-200 in combination with CD/PMD module EXFO FTB-5700 was performed. Moreover, PMD etalons with defined values of delay was used for measurement. All results were evaluated in comparison with defined limit values.

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18

Du, Qing Fu. "Temperature Measurement with High Accuracy." Advanced Materials Research 301-303 (July 2011): 1333–38. http://dx.doi.org/10.4028/www.scientific.net/amr.301-303.1333.

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Calibration of general temperature sensor, platinum resistor is done with measuring its zero resistance and dispersity of linear system and compensating. Accurate constant current source is used to provide platinum resistor sensor power and four-wire measuring method is designed for self-compensation of lead wire resistance. With amplifying the changing signal of platinum using amplifier of high precision and low temperature drift, and MCPU digital filtering, highly accurate temperature measurement result is got finally.

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19

Alhaj, Hussam M. M., Nursyarizal Mohd Nor, Vijanth S. Asirvadam, M. F. Abdullah, and T. Ibrahim. "Time Delay Measurement Compensation in Harmonic State Estimation." Applied Mechanics and Materials 699 (November 2014): 745–50. http://dx.doi.org/10.4028/www.scientific.net/amm.699.745.

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The proliferation of power electronics equipments generates harmonics distortion problem. Harmonics have many effects to the power system grid and the main limitation of harmonics is heating of power system devices. To monitor and mitigate the harmonics, the source location and the level of harmonics should be known. However, harmonic measurements are costly and is not practical to put harmonic measurement in each location in the grid. Hence, harmonic state estimation is needed. The most common method in harmonic state estimation is singular value decomposition (SVD). A time delay of the measurements can affect the SVD performance, therfore,this paper presents a prediction method based on ARX model and modified normalized least mean square to compensate the time delay measurements. The result shows better performance of the proposed method as compared to least mean square.

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20

Wan, Peng, Jun Jie Guo, and Hai Tao Li. "Study on the Method of Error Identification and Compensation for Gear Measuring Center." Advanced Materials Research 482-484 (February 2012): 1821–28. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.1821.

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Gear Measuring Center(GMC) is commonly used to test error of the tooth surface of the gear, whose geometric accuracy directly impacts on the accuracy of measurement. How to quickly and accurately detect space geometric error of the measuring machine and compensate becomes the essential means of high-precision measurements. According to the problem above, in the paper, three-beams laser detection technology is proposed. The detection of the geometric errors of the linear axis was achieved. The accurate measurement for the position and attitude of the plane mirror on measurement seat was achieved based on laser telemetry principle. The positioning error, the pitching angle errors, the deflection angle errors and the straightness errors were separated. And then based on multi-body system theory, by using of homogeneous coordinate transformation, the error compensation model of 4-axis measuring machine which includes three shifting pairs and one revolute pair was established, and the algorithm was given in the paper. The theoretical foundation for real-time compensation of 4-axis GMC was established. The geometric errors of GMC can be improved by the method of the error detection and compensation. The method plays a very important role in high-precision measurements.

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21

Li, Yuebo, and Aimin Wang. "Machining Error Compensation Method for Thin Plate Parts Based on In-machine Measurement." Journal of Physics: Conference Series 2183, no. 1 (January 1, 2022): 012001. http://dx.doi.org/10.1088/1742-6596/2183/1/012001.

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Abstract Aiming at the problem of datum drift and dimension error compensation of machine tool in the machining process of plate parts.This paper presents a machining error compensation method for plate parts based on in-machine measurement.The parts are measured in situ in the clamping state by machine measuring equipment;The key features were reconstructed based on the measurement results, and the parts were divided into four quadrant regions, and the scaling errors of knife points in different quadrants were compensated according to different directions.Then, the reconstructed key feature model is discretized into point cloud data model.Based on binary tree and improved iterative nearest point algorithm, the margin optimization and datum correction rotation matrix and translation vector are obtained.The accuracy and quality of the machine tool are improved by adjusting the rotation matrix and translational vector according to the procedure of compensating the error of scaling.

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22

Lv, Jun Wei, Zhen Tao Yu, and Li Heng Fan. "A New Compensation Method for the Magnetic Interference of Vehicle." Applied Mechanics and Materials 373-375 (August 2013): 811–14. http://dx.doi.org/10.4028/www.scientific.net/amm.373-375.811.

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It is unavoidable that the geomagnetic field measurement is interfered by the vehicle magnetic field in geomagnetic navigation. In order to improve the measurement accuracy, the magnetic interference of vehicle must be correctly compensated. Based on the ellipse fitting compensation method, a new 3D magnetic interference compensation method is proposed. The proposed method improves the vehicle magnetic interference compensation method from 2D ellipse fitting to 3D ellipsoid fitting by the least square algorithm of ellipsoid restriction, which relaxes the restriction on 2D motion of vehicles. And a computing method of the compensation parameters is proposed to decrease the load of calculation. Finally, the experiment shows that the compensation method can compensate the vehicle 3D magnetic interference efficiently.

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23

Adamczyk, Marcin, Paweł Liberadzki, and Robert Sitnik. "Temperature Compensation Method for Digital Cameras in 2D and 3D Measurement Applications." Sensors 18, no. 11 (October 30, 2018): 3685. http://dx.doi.org/10.3390/s18113685.

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This paper presents the results of several studies concerning the effect of temperature on digital cameras. Experiments were performed using three different camera models. The presented results conclusively demonstrate that the typical camera design does not adequately take into account the effect of temperature variation on the device’s performance. In this regard, a modified camera design is proposed that exhibits a highly predictable behavior under varying ambient temperature and facilitates thermal compensation. A novel temperature compensation method is also proposed. This compensation model can be applied in almost every existing camera application, as it is compatible with every camera calibration model. A two-dimensional (2D) and three-dimensional (3D) application of the proposed compensation model is also described. The results of the application of the proposed compensation approach are presented herein.

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He, C. Y., W. M. Li, and T. Huang. "A New Method for Single-Measurement and Compensating the Position Errors of a Three-Axis Machine Tool." Materials Science Forum 697-698 (September 2011): 314–19. http://dx.doi.org/10.4028/www.scientific.net/msf.697-698.314.

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There is great practical significance in error compensation of CNC machine tools. In this dissertation, the measurement theory and application methods of some advanced measure were analyzed. From those measurement methods, we found the drawback of comprehensive error measurement. Further more, this paper has detailed a new defined as single-measurement for the sake of the double-frequency laser interferometer to measure 14 geometric errors of three-axis system. The method facilitates measurements and shortens the machine shutdown time.

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Mei, Chuan Zhi, Lin Hua Piao, and Bao Li Zhang. "Study on Fluidic Gyroscope Linearity Compensation Method." Advanced Materials Research 756-759 (September 2013): 4221–24. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.4221.

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Based on the linearity of the MEMS thermal element fluidic gyroscope compensation. By analyzing the results of the linear characteristic of the fluidic gyroscope sensor output, comparator linearity compensation two implementation methods, the introduction of the microcontroller and the temperature sensor, to achieve the linearity compensation of the gyro output signal. The experiments show that: after compensation, the non-linearity of the fluidic gyroscope5%down to 0.5%, to-120°/s~+120°/s measurement range from-40°/s~+40°/s Fluidic gyroscope linearity compensation with low non-linearity, wide measuring range.

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Hao, Qun, and Q. D. Zhu. "Aspheric Surface Testing Using a Partial Compensation Lens." Key Engineering Materials 381-382 (June 2008): 263–66. http://dx.doi.org/10.4028/www.scientific.net/kem.381-382.263.

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Null compensator method is a popular aspheric surface testing method. However null compensator has the characteristics of complex structure, high price and poor universal property. This paper proposed to test aspheric surface by a partial compensation lens (PCL) to overcome the defect. This novel PCL method is designed to partially compensate the wave aberration caused by the aspheric surface, which allow some residual wave aberration exists. Research was conducted on measurement principle, design method of PCL. The experiment results show the feasibility and validity of this method.

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D, Sundarasekaran, and Gomathy C. "COMPENSATION METHOD IN BOILER DRUM LEVEL MEASUREMENT AND CONTROL." International Journal on Intelligent Electronic Systems 4, no. 2 (2010): 56–61. http://dx.doi.org/10.18000/ijies.30079.

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Chunxia Lu, Xiaodong Chen, Jianhua Wang, and Linyan Wang. "Eccentricity Compensation Method in the Rectangle Ring Gauge Measurement." Journal of Convergence Information Technology 8, no. 8 (April 30, 2013): 366–74. http://dx.doi.org/10.4156/jcit.vol8.issue8.44.

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Zhang, Qi, Hongfeng Pang, and Chengbiao Wan. "Magnetic interference compensation method for geomagnetic field vector measurement." Measurement 91 (September 2016): 628–33. http://dx.doi.org/10.1016/j.measurement.2016.05.081.

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Coppens, Joris E., Luuk Franssen, L. J. van Rijn, and Thomas J. T. P. van den Berg. "Reliability of the compensation comparison stray-light measurement method." Journal of Biomedical Optics 11, no. 3 (2006): 034027. http://dx.doi.org/10.1117/1.2209555.

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31

Wang, Ling-Yu, Hong-Mian Du, and Hao Xu. "Compensation method for infrared temperature measurement of explosive fireball." Thermochimica Acta 680 (October 2019): 178342. http://dx.doi.org/10.1016/j.tca.2019.178342.

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Zhu, Xiaorui, Shunchun Yao, Wei Ren, Zhimin Lu, and Zhenghui Li. "TDLAS Monitoring of Carbon Dioxide with Temperature Compensation in Power Plant Exhausts." Applied Sciences 9, no. 3 (January 28, 2019): 442. http://dx.doi.org/10.3390/app9030442.

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Temperature variations of flue gas have an effect on carbon dioxide (CO2) emissions monitoring. This paper demonstrates accurate CO2 concentration measurement using tunable diode laser absorption spectroscopy (TDLAS) with temperature compensation methods. A distributed feedback diode laser at 1579 nm was chosen as the laser source for CO2 measurements. A modeled flue gas was made referring to CO2 concentrations of 10–20% and temperatures of 298–338 K in the exhaust of a power plant. Two temperature compensation methods based on direct absorption (DA) and wavelength modulation (WMS) are presented to improve the accuracy of the concentration measurement. The relative standard deviations of DA and WMS measurements of concentration were reduced from 0.84% and 0.35% to 0.42% and 0.31%, respectively. Our experimental results have validated the rationality of temperature compensations and can be further applied for high-precision measurement of gas concentrations in industrial emission monitoring.

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33

Zhaoxing, Lu, Fang Jiancheng, Gong Xiaolin, Li Jianli, Wang Shicheng, and Wang Yun. "Dynamic Lever Arm Error Compensation of POS Used for Airborne Earth Observation." International Journal of Aerospace Engineering 2018 (2018): 1–13. http://dx.doi.org/10.1155/2018/9464568.

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The position and orientation system (POS) is widely applied in airborne Earth observation, which integrates the strapdown inertial navigation system (SINS) and global positioning system (GPS) to provide high-accuracy position, velocity, and attitude information for remote sensing motion compensation. However, for keeping the appointed direction of remote sensing load, the inertial measurement unit (IMU) and remote sensing load will be driven to sweep by the servo machine. The lever arms among IMU, GPS, and remote sensing load will be time varying, and their influence on the measurement accuracy of POS is serious. To solve the problem, a dynamic lever arm error compensation method is proposed, which contains the first-level lever arm error compensations between IMU and GPS and the second-level lever arm error compensation between POS and remote sensing load. The flight experiment results show that the proposed method can effectively compensate the dynamic lever arm error and achieve high measurement accuracy for POS.

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34

Sato, Ryuta, and Kotaro Nagaoka. "Motion Trajectory Measurement of NC Machine Tools Using Accelerometers." International Journal of Automation Technology 5, no. 3 (May 5, 2011): 387–94. http://dx.doi.org/10.20965/ijat.2011.p0387.

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NC controllers use different types of compensation systems to improve motion accuracy of feed drive systems against pitch error, friction, backlash, and elastic deformation. Compensators for static error, such as pitch and squareness errors, are tuned semiautomatically. However, for dynamic error such as quadrant glitches and vibration, parameter tuning takes too much time. In this study, motion trajectory measurement for parameter tuning using accelerometers has been proposed. In the methods, displacements of each axis can be obtained from measured accelerations along each axis. Although the obtained displacements include some errors, such as setting error, sensitivity error, and integral error in numerical integration, the errors can be compensated for based on the feedback positions measured simultaneously. To confirm the feasibility of the proposed methods, measurement tests using a grid encoder are carried out. Results of the measurements confirm that the circular trajectories and vibrations can be measured by the proposed method. Automatic parameter tuning method for the backlash compensator is also proposed.

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35

CHOI, NAK-SAM, and DAL-WOO JUNG. "A CALIBRATION METHOD OF MECHANICAL STRAINS FROM A TEMPERATURE-COMPENSATING FBG SENSOR." Modern Physics Letters B 22, no. 11 (May 10, 2008): 1111–15. http://dx.doi.org/10.1142/s0217984908015929.

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The sensitivity of a temperature-compensating fiber Bragg grating (FBG) sensor which has different FBGs in one fiber line was analyzed for the real time measurement of mechanical normal strain in structures. Measurement of mechanical strains of the aluminum beam surface by the double FBG sensor was performed under various heating rates and temperature range. The results were compared with those of an electrical resistance strain gage. A considerable delay in the strain measurement by the double FBG sensor during the heating process was shown, which could be quantified for the strain compensation by the introduction of a strain retardation factor to the FBG sensor.

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36

Huang, Hao, Xiang Yang Lei, Jian Wang, Qiao Xu, Liang Yu He, and Yin Biao Guo. "A Machining Error Compensation Method Using on-Machine Profile Measurement in 3-Axis Aspheric Grinding." Advanced Materials Research 154-155 (October 2010): 390–95. http://dx.doi.org/10.4028/www.scientific.net/amr.154-155.390.

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The causes of machining errors are very complicated and apt to mutual influence in aspheric grinding, so it is difficult to improve machining accuracy by control one cause. To compensate the machining error of large aspheric grinding, an error-compensation technique using on-machine profile measurement system in three axes grinding machine are presented. To verify the effectiveness of the compensation machining and the reliability of the measurement system, experiments on high-precision grinding machine were performed. Moreover, the compensation machining with the on-machine measurement substantially decreases the machining errors and improve machining accuracy by more than 45%, compared with the non-compensation machining.

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37

Li, J., and Y. Han. "Dispersion Compensation Method for Lamb Waves Based on Measured Wavenumber." Shock and Vibration 2020 (February 22, 2020): 1–9. http://dx.doi.org/10.1155/2020/6704642.

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In this study, a delta wavenumber dispersion compensation (∆K-DC) method was developed and applied, not only with the theoretical wavenumber but also with the measured wavenumber. Dispersion compensation can be achieved by the following steps: relative wavenumber measurement, traveling distance estimation, phase compensation, and wave correction. The feasibility of ∆K-DC with the theoretical wavenumber and measured wavenumber was validated with a high-dispersive A0 mode in a 2 mm steel plate experiment. The results showed that phase spectrum measurement was an effective method to construct the wavenumber curve, the propagation distances estimated by SAP2 were very accurate, and the dispersive signals can be compensated perfectly by applying the phase compensation and wave correction methods for each wavepacket. The present results highlight the application of ∆K-DC on dispersion compensation without any material parameters of a waveguide.

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38

Johnson, R. F., and J. W. Rish. "Rolling Weight Deflectometer with Thermal and Vibrational Bending Compensation." Transportation Research Record: Journal of the Transportation Research Board 1540, no. 1 (January 1996): 77–82. http://dx.doi.org/10.1177/0361198196154000111.

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A pavement deflectometer has been developed for continuous measurement of airfield pavements under a rolling load wheel. The rolling weight deflectometer (RWD) measures pavement deflection using a new method of laser triangulation. It also compensates for bending of the beam on which the sensors are mounted. This compensation allows accurate measurement of deflection in the presence of motion and thermal effects. The deflection measurement incorporates data from four equally spaced pavement sensors mounted on a beam. The method requires the sensors to remain in a straight line at all times. This method was previously plagued with measurement errors caused by thermal and vibrational effects. The RWD uses a laser beam to monitor the state of bending of the physical beam in real time. The bending data are used with pavement sensor data to produce accurate deflection measurements in the presence of any amount of beam bending. The bending-compensated RWD produces deflection measurements on 0.3-m (1-ft) intervals with an accuracy of 40 microns (0.0015 in.) while moving at 10 km/hr (6 mph). The RWD is composed of a towed trailer, a networked data-acquisition system, and a load platform. Its essential elements consist of a horizontally transported beam, strategically placed pavement sensors, sensors to measure beam bending, an odometer, and a data-acquisition computer. A brief history of pavement deflection methods is presented along with a description of the RWD. Preliminary field results include a comparison between data obtained by a falling weight deflectometer and the RWD.

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39

Wang, Xiao Jun, Yong Jie Zhao, and Jian Xue. "Ultra-High Resistance Measurement Based on Offset Current Compensation." Applied Mechanics and Materials 373-375 (August 2013): 856–60. http://dx.doi.org/10.4028/www.scientific.net/amm.373-375.856.

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An on-line offset current compensation method is proposed to improve ultra-high resistance (UHR) measurement more accurately and reliably. Iterative compensation algorithm is firstly adopted to generate compensation current by adjusting the compensation DAC to decrease the offset current to approximate zero, and then on-line offset current measurement algorithm is employed to ensure the time-varying offset current is always in an appropriate range. This algorithm can maintain a continuous unsaturated measurement process. Experiment results show that the uncertainty (k=2) is 1.4% for 1014Ω and 5.5% for 1015Ω under ±1000V based on the offset current compensation method proposed, which has been successfully implemented in a commercial UHR meter.

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40

Xiong, Zhenhua, and Zexiang Li. "Probe Radius Compensation of Workpiece Localization." Journal of Manufacturing Science and Engineering 125, no. 1 (February 1, 2003): 100–104. http://dx.doi.org/10.1115/1.1537260.

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Workpiece localization has direct relations with many manufacturing automation applications. In order to gain accurate workpiece measurement by on-machine measurement system or coordinate measuring machines (CMM), the touch trigger probe is widely adopted. In spite of the high repeatability of the touch trigger probe, there are still error sources associated with the probe. In this paper, we will focus on probe radius compensation. We first show the sources of probe radius error. Then, several compensation methods in related papers are reviewed. After that, a new radius compensation method is proposed in this paper. Simulation and experimental results of probe radius compensation by different methods are given. It is shown that our proposed method has the best performance both in terms of compensation accuracy and computational time. The method is also implemented in a computer aided setup (CAS) system.

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41

Liu, Wei, Zhao Hui Deng, Lin Lin Wan, and Hao Tang. "Research Progress of On-Line Measurement and Compensation Technology about Grinding Wheel Wear." Advanced Materials Research 565 (September 2012): 190–95. http://dx.doi.org/10.4028/www.scientific.net/amr.565.190.

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According to the characteristics of grinding wheel wear in the grinding process, the grinding wheel wear forms and their reasons are analyzed. At the same time, as the grinding wheel wear will affect the size of components, the procedures of on-line measurement and compensation technology about grinding wheel wear are summarized. The current domestic and international research status of on-line measurement and compensation methods about grinding wheel wear are introduced, such as position calibration based method, machine vision based method, laser displacement based method, acoustic emission based method, grinding force based method, cutting vibration based method, grinding acceleration based method and pressure based method. Finally, the current research difficulties of grinding wheel wear’s on-line measurement and compensation technology are analyzed, and the further research direction is made.

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42

Zybov, V. N., L. Ya Mizyuk, and Z. T. Nazarchuk. "Compensation method in multifactor measurements." Measurement Techniques 42, no. 2 (February 1999): 95–102. http://dx.doi.org/10.1007/bf02504241.

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43

Barton, S. A., C. E. Hahn, and A. M. Black. "A compensation method for membrane-covered (Clark) electrodes." Journal of Applied Physiology 65, no. 3 (September 1, 1988): 1430–35. http://dx.doi.org/10.1152/jappl.1988.65.3.1430.

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Membrane-covered electrodes (Clark electrodes) are widely used for monitoring blood gases, particularly PO2. A method of compensating for the inherently limited speed of response of Clark electrodes is presented. The theoretical response in the time domain is related to that in the frequency domain, and the latter is deduced from measurement of the former. Although the response functions are both infinite series, both responses are nevertheless completely defined by a single time parameter Te characteristic of the electrode under given measurement conditions. Practical verification was performed using electrodes in the double-pulsed mode, but the theory is applicable equally to direct-current-polarized and simply pulsed electrodes.

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44

Xu, Bin, So Ito, Yuki Shimizu, and Wei Gao. "Eccentric Error Compensation for Pitch Deviation Measurement of Gears." Key Engineering Materials 523-524 (November 2012): 853–58. http://dx.doi.org/10.4028/www.scientific.net/kem.523-524.853.

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An eccentric error compensation method is presented for the pitch deviation measurement of gears. The eccentric error compensation method mainly consists of the evaluation of the assembly accuracy, the reconstruction of the reference curve and the coordinate compensation of intersection points. The geometrical model of the measurement system was analyzed and the corresponding mathematical model was proposed. A gear with small modulus was adopted as the specimen for the pitch deviation measurement. Experimental results reveal that the values of eccentricity can be extracted from the measured profile successfully and the eccentric error compensation is effective for the pitch deviation measurement of gears.

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45

Xu, Meng, Keiichi Nakamoto, and Yoshimi Takeuchi. "Compensation Method for Tool Setting Errors Based on Non-Contact On-Machine Measurement." International Journal of Automation Technology 14, no. 1 (January 5, 2020): 66–72. http://dx.doi.org/10.20965/ijat.2020.p0066.

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The high-accuracy manufacturing of optical requires highly integrated ultraprecision cutting technologies. However, all sorts of small errors adversely affect machining accuracy because of the miniaturization and complexity of objects. Among these errors, slight setting errors critically impact machining accuracy because it is difficult to place a cutting tool accurately on a ultraprecision machine tool. The authors have conducted multi-axis control ultraprecision cutting based on tool setting errors compensation. In this compensation method, the workpiece must be removed from the machine tool after test cutting to measure grooves to detect actual tool positions and to calculate setting errors. However, after the workpiece is removed, it cannot be perfectly replaced on a ultraprecision machine tool. This makes it difficult to automate setting errors compensation. In order to solve these problems, tool positioning must be detected without removing the workpiece. Therefore, in this study, a novel compensation method is developed by means of non-contact measurement with a laser imaging device. Furthermore, in order to improve compensation performance, a laser imaging device is calibrated on an ultraprecision machine tool. The proposed method enables direct detection of actual tool position and calculation of the tool centerpoint coordinate on the machine coordinate system. By modifying an NC program, the tool setting errors can be finally compensated. The feasibility of the proposed compensation method is verified by conducting experiments of creating grooves.

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46

Zeng, Qi Wen, and Guang Lin Wang. "Researchment on Valve Sleeve Bore’s Cylindricity Pneumatic Measurement Technology Based on Error Compensation." Key Engineering Materials 579-580 (September 2013): 476–81. http://dx.doi.org/10.4028/www.scientific.net/kem.579-580.476.

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Raising a pneumatic measurement method to measure the valve sleeve bores cylindricity based on error compensation. Analysis related errors of the raised measurement method, determined the maximum error, and setting up the error compensation model to the maximum error, designed the measurement system, related experiment has been conducted, which verified the correctness of the measurement method and the accuracy of the measurement system.

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47

Petrosyan, Hovsep S., Yegisabeth H. Hayrapetyan, and Hovnan A. Hunanyan. "The Construction Basis of High-Precision Optical Range Finder GD-j₁(l)." Materials Science Forum 931 (September 2018): 681–86. http://dx.doi.org/10.4028/www.scientific.net/msf.931.681.

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The methods of construction of high-precision rangefinder on the modulation method, which will complement the means of linear measurements on the interference method, are considered. The linearly compensation method, which leads to the possibility of implementing range finders with an error of mφ=0.01 mm, is proposed as the basic constructions of extremely high accuracy linear measurement devices.

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48

Tian, Huanhuan, Yixiao Liu, Jiqin Zhou, Ying Wang, Jing Wang, and Weigong Zhang. "Attitude Angle Compensation for a Synchronous Acquisition Method Based on an MEMS Sensor." Sensors 19, no. 3 (January 24, 2019): 483. http://dx.doi.org/10.3390/s19030483.

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As a new type of micro-electro-mechanical systems (MEMS) inertial sensor, the Quartz Vibrating Beam Accelerometer (QVBA) is widely used in intelligent sweeping robots, small aircraft, navigation systems, etc. For these applications, correcting and compensating the attitude angle with the result of acceleration plays an important role to improve the measurement accuracy. The synchronization error between the measurement of the accelerometer and gyroscope attitude angle has an adverse impact on the accuracy of the attitude angle. In this paper, a synchronous acquisition scheme of the accelerometer and gyroscope attitude angle in a strapdown inertial navigation system (SINS) is proposed. At the same time, to improve the sampling accuracy and the conversion speed of QVBA, an improved equal-precision frequency measuring method is also implemented in this paper. The hardware float point unit (FPU) is used to accelerate the calculation of the frequency measurement value. The long-term cumulative error of the frequency measurement value is less than 10 − 4 . The calculation process time from sampling to attitude angle compensation calculation is reduced by 40.8%. This work has played a very good role in improving the measurement accuracy and speed of the SINS.

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Geng Lei, Xiao Zhitao, Wu Jun, Zhang Fang, and Miao Jinghong. "Monocular Vision Distance Measurement Method Based on Dynamic Error Compensation." International Journal of Digital Content Technology and its Applications 7, no. 5 (March 15, 2013): 230–39. http://dx.doi.org/10.4156/jdcta.vol7.issue5.28.

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50

Cha, Yong-Dae, and Gil-Wwon Yoon. "Measurement of electrical conductivity by a dynamic temperature compensation method." Journal of Sensor Science and Technology 17, no. 3 (May 31, 2008): 223–28. http://dx.doi.org/10.5369/jsst.2008.17.3.223.

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