Relevant bibliographies by topics / Photoacoustic spectrometer

Academic literature on the topic 'Photoacoustic spectrometer'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Photoacoustic spectrometer"

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Palanichamy, P., P. Kalyanasundaram, K. Jeyadheepan, M. Jeyaprakasam, K. Ramachandran, and C. Sanjeeviraja. "Automation of Photoacoustic Spectrometer for NDE Applications." Materials Science Forum 699 (September 2011): 185–204. http://dx.doi.org/10.4028/www.scientific.net/msf.699.185.

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New software using VEE Pro was developed to integrate the various components of photoacoustic spectrometer through RS-232 interface and this is the first time such an effort is made not only to integrate but also to automatically acquire the data for depth profile and wave length scanning. The performance and validity was rigorously tested for repeatability and standard error for samples like air, glass and silicon wafer. As an application towards NDE, the thermal parameters obtained from photoacoustics are compared with ultrasonics and discussed.
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Qiu, Yi-Geng, Yuan-Yuan Fan, Bo-Xia Yan, Yan-Wei Wang, Yi-Hang Wu, Zhe Han, Yan Qi, and Ping Lu. "Design and experiment of light field shaping system for three-dimensional extended light source used in photoacoustic spectrometer." Acta Physica Sinica 70, no. 20 (2021): 204201. http://dx.doi.org/10.7498/aps.70.20210691.

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Compared with infrared laser sources, the three-dimensional incoherent extended light source has the advantages of high power, wide spectral range, and low cost. It has extremely wide applications in high-precision and multi-component photoacoustic spectrometers. However, it encounters some problems about poor directivity, low energy density, irregular shape, light field shaping needed in the design of optical system. The photoacoustic spectrometer is required to collect and optimize the radiation of the centimeter-level three-dimensional extended light source to the whole space in a small volume. Through using a series of wavelength and frequency modulation elements, the final cylindrical light field distribution with millimeter-level radius and centimeter-level length is realized. According to the concept of optical expansion and the principle of edge light, this paper breaks through the traditional design mode based on point light source in the process of optical system design and optimization. The concept of extended light source is used throughout the design process. The luminous characteristics of the three-dimensional extended light source are directly acquired by the self-designed measurement method and device which is accurately reflected in the three-dimensional extended light source model in the form of micro-element. The design of the light field shaping system of the three-dimensional extended light source for the photoacoustic spectrometer is realized by the aspheric surface, and the relevant experimental verification is carried out. Taking the Hawkeye IR-Si272 light source for example, the experimental value of the light power at the entrance of the photoacoustic cell and the sidewall noise rate of the photoacoustic spectrometer have a small deviation from their corresponding simulation values. Compared with the original condenser system, the self-designed photoacoustic spectrometer light source system increases the value of the light power at the entrance of the photoacoustic cell from 0.86W to 1.32W, and reduces the value of the sidewall noise rate from 50.3% to 19.7%. The lower limit of detection of the concentration of trace gas in the order of ppm (parts per million) is also achieved.
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Boraas, Kirk, and J. P. Reilly. "Low‐temperature intracavity photoacoustic spectrometer." Review of Scientific Instruments 64, no. 11 (November 1993): 3108–10. http://dx.doi.org/10.1063/1.1144474.

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Bluvshtein, Nir, J. Michel Flores, Quanfu He, Enrico Segre, Lior Segev, Nina Hong, Andrea Donohue, James N. Hilfiker, and Yinon Rudich. "Calibration of a multi-pass photoacoustic spectrometer cell using light-absorbing aerosols." Atmospheric Measurement Techniques 10, no. 3 (March 29, 2017): 1203–13. http://dx.doi.org/10.5194/amt-10-1203-2017.

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Abstract. The multi-pass photoacoustic spectrometer (PAS) is an important tool for the direct measurement of light absorption by atmospheric aerosol. Accurate PAS measurements heavily rely on accurate calibration of their signal. Ozone is often used for calibrating PAS instruments by relating the photoacoustic signal to the absorption coefficient measured by an independent method such as cavity ring down spectroscopy (CRD-S), cavity-enhanced spectroscopy (CES) or an ozone monitor. We report here a calibration method that uses measured absorption coefficients of aerosolized, light-absorbing organic materials and offer an alternative approach to calibrate photoacoustic aerosol spectrometers at 404 nm. To implement this method, we first determined the complex refractive index of nigrosin, an organic dye, using spectroscopic ellipsometry and then used this well-characterized material as a standard material for PAS calibration.
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Cheng, Gang, Yuan Cao, Kun Liu, Ya-Nan Cao, Jia-Jin Chen, and Xiao-Ming Gao. "Numerical calculation and optimization of photoacoustic cell for photoacoustic spectrometer." Acta Physica Sinica 68, no. 7 (2019): 074202. http://dx.doi.org/10.7498/aps.68.20182084.

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Davies, Nicholas W., Michael I. Cotterell, Cathryn Fox, Kate Szpek, Jim M. Haywood, and Justin M. Langridge. "On the accuracy of aerosol photoacoustic spectrometer calibrations using absorption by ozone." Atmospheric Measurement Techniques 11, no. 4 (April 24, 2018): 2313–24. http://dx.doi.org/10.5194/amt-11-2313-2018.

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Abstract. In recent years, photoacoustic spectroscopy has emerged as an invaluable tool for the accurate measurement of light absorption by atmospheric aerosol. Photoacoustic instruments require calibration, which can be achieved by measuring the photoacoustic signal generated by known quantities of gaseous ozone. Recent work has questioned the validity of this approach at short visible wavelengths (404 nm), indicating systematic calibration errors of the order of a factor of 2. We revisit this result and test the validity of the ozone calibration method using a suite of multipass photoacoustic cells operating at wavelengths 405, 514 and 658 nm. Using aerosolised nigrosin with mobility-selected diameters in the range 250–425 nm, we demonstrate excellent agreement between measured and modelled ensemble absorption cross sections at all wavelengths, thus demonstrating the validity of the ozone-based calibration method for aerosol photoacoustic spectroscopy at visible wavelengths.
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Sapna , P. Bhaskar, Sapna ,. P. Bhaskar. "Review on Applications of Photoacoustic Spectrometer." International Journal of Electrical and Electronics Engineering Research 7, no. 4 (2017): 61–70. http://dx.doi.org/10.24247/ijeeeraug20177.

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Guo, Lina, Zhilie Tang, Yongheng He, and Hanchao Zhang. "Characterization of a derivative photoacoustic spectrometer." Review of Scientific Instruments 78, no. 2 (February 2007): 023104. http://dx.doi.org/10.1063/1.2472594.

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Budevska, Boiana O., and Christopher J. Manning. "Time-Resolved Impulse Photoacoustic Measurements by Step-Scan FT-IR Spectrometry." Applied Spectroscopy 50, no. 7 (July 1996): 939–47. http://dx.doi.org/10.1366/0003702963905457.

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An impulse/response approach for measuring photoacoustic spectra is described. Instead of the usual modulation from either a chopper or an interferometric phase modulation, a radiation pulse is used to generate the photoacoustic (PA) signal at each step of a step-scan FT-IR spectrometer. The signal from the PA cell is recorded as a time-resolved sequence. The time-dependent photoacoustic signal reveals depth-profiling information for solid samples. Examples of time-resolved impulse photoacoustic spectra (TRIPAS) of gas and solid samples are presented.
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Anjo, Dennis, Coleman Smith, and Humberto Gutierrez. "Construction of a Microcomputer Controlled Photoacoustic Spectrometer." Instrumentation Science & Technology 21, no. 3-4 (January 1993): 113–21. http://dx.doi.org/10.1080/10739149308543767.

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Dissertations / Theses on the topic "Photoacoustic spectrometer"

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Macleod, Kenneth Alexander. "Validation and application of a photo-acoustic gas analyser for multiple breath inert gas washout in children." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/33295.

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Multiple breath washout (MBW) of inert gas for assessment of airway disease in children is an emerging technique. In many studies Lung Clearance Index (LCI), derived from multiple breath washout of SF6, is more able to detect early or mild lung disease than standard lung function measurements. It is also able to detect very early lung disease in progressive conditions such as Cystic Fibrosis (CF). Where infants born with this condition were thought to have minimal lung disease activity, LCI is higher in these children than healthy controls. Lack of available commercial devices has hampered expansion of this technique to centres other than specialist research teams. Innocor (Innovision, Dk), a photoacoustic mass spectrometer capable of performing multiple breath washout, was adapted within this research group for use in adults. This thesis describes the setup, adaptation and validation of Innocor for use in children. In 4 studies, healthy controls, children with asthma and children with CF were recruited to perform MBW. In one study, 29 healthy controls and 31 children with asthma were recruited. Healthy controls performed 1 set of washouts, establishing a normative range. Children with asthma performed measurements before and after bronchodilator. Results showed increased LCI in children with asthma even though they were clinically stable as defined by symptoms. LCI stayed high even following bronchodilator suggesting evidence of residual airway disease in well controlled asthmatics despite adequate symptom control. To investigate short term variability of MBW measurements, two other studies recruited 18 children with CF in each. They performed measurements before and after standard physiotherapy manoeuvres and during sitting and lying posture. LCI did not change significantly after airway clearance physiotherapy, compared with children who did no intervention. Variability was high in both groups however suggesting CF lung disease is a complex interaction of changing ventilation in adjacent lung units. Lying posture induced greater changes in lung function in children with CF than controls. LCI appears to be more sensitive to this change than standard lung function measurements (spirometry). In another study 32 children with CF were recruited to perform serial lung function measurements over 18 months. These were data collected as part of the UK Cystic Fibrosis Gene Therapy Consortium (CFGTC) clinical studies in preparation for planned gene therapy trials. LCI appears comparable to FEV1 and may be able to detect another aspect of airway disease. All initial studies were performed in older children (>5yrs). The basic Innocor device is unsuitable for testing of younger patients with low breath volume and high respiratory rate. In-house adaptations following detailed lung model experimentation led to a faster analyser response, potentially capable of MBW in younger children. The second part of this thesis concerns lab experiments and an in-vivo comparison with the current gold-standard MBW device, a respiratory mass spectrometer. 16 healthy volunteers and 9 children with CF were recruited. Ages ranged from 0.4 yrs to 49 yrs. Innocor values for lung volume estimation compared favourably with the mass spectrometer. No evidence of bias caused by Innocor error was seen, however intra-test variability was rather high, reducing the precision of the results. These studies indicate Innocor is a robust, simple to use device with potential as a commercial lung function system. Modifications were made to make it suitable for use in all ages. Further development will need to focus on the patient interface and software, which is the domain of the manufacturers. The experiments contained in this thesis are therefore of interest to the wider respiratory research community as well as manufacturers of MBW devices.
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Rouxel, Justin. "Conception et réalisation de cellules photoacoustiques miniaturisées pour la détection de traces de gaz." Thesis, Reims, 2015. http://www.theses.fr/2015REIMS030/document.

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Les cellules photoacoustiques sont des capteurs optiques qui utilisent l'absorption des photons par des molécules de gaz pour générer une onde de pression proportionnelle à leur concentration. Le signal photoacoustique est également inversement proportionnel au volume de la cellule. La miniaturisation de la cuve permet donc l’amélioration des performances du capteur. Le travail de cette thèse consiste en la conception, la réalisation et la caractérisation de cellules photoacoustiques résonantes différentielles d’Helmholtz (DHR) miniaturisées. Dans un premier temps, des simulations par la méthode des éléments finis de cellules à l'échelle millimétrique ont permis de montrer que la miniaturisation de ce type de résonateur est une voie prometteuse. Aussi, la réalisation ambitieuse d’une cellule DHR sur silicium a été engagée en utilisant les techniques de la microélectronique. Cependant, cette voie de miniaturisation extrême s'est heurtée à des difficultés de réalisation, qui n'ont pas permis d'obtenir des dispositifs fonctionnels. Une alternative de miniaturisation, à l'échelle centimétrique, utilisant des microphones MEMS du commerce, a donc été engagée. Trois cellules fabriquées par différentes méthodes ont été réalisées et testées pour la détection de méthane. La dernière génération a permis la détection d'environ 100 ppb de méthane avec un laser à cascade interbande commercial à 3,357 µm de longueur d’onde. Pour préparer la prochaine génération de cellules, l'optimisation de la géométrie a été effectuée par simulation. Cette optimisation permet d'envisager une augmentation de 43 % du signal par rapport à la cellule la plus performante
Photoacoustic cells are optical sensors based on the absorption of photons by gas molecules. The pressure wave created by gas relaxation is proportional to the trace gas concentration. Furthermore the photoacoustic signal is inversely proportional to the cell volume. Thus cell miniaturization enables performances improvements. This work consists in designing, realizing and characterizing miniaturized photoacoustic cells, based on the differential Helmholtz resonator (DHR) principle. In a first phase, modeling by the finite element method of millimeter scale cells has shown that the miniaturization of this type of resonator should effectively improve the detection limit. Thus, the ambitious realization of a DHR cell on silicon by the use of microelectronic techniques has been attempted. However, this extreme miniaturization direction encountered design and fabrication difficulties which made the produced devices unusable. To overcome these difficulties, a miniaturization alternative, at the centimeter scale, using commercial MEMS microphones, has been carried out. Three cells have been built by different methods and have been tested for methane detection. The last cell generation can detect around 100 ppb of methane with a commercial interband cascade laser at 3.357 µm of wavelength. Finally, to anticipate the next cell generation fabrication, a geometry optimization has been performed by simulation. This optimization shows that a 43 % signal improvement, compared to the most performant cell already built
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Goodall, Rosemary A. "Non-destructive techniques for the analysis of pigments from an archaeological site." Thesis, Queensland University of Technology, 1997. https://eprints.qut.edu.au/36948/1/36948_Goodall_1997.pdf.

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The detennination of trade routes and social interactions has previously been undertaken using cultural records and archaeological trends. In many regions this infonnation is sparse or inconclusive. By provenancing materials such as the pigments used by Aboriginal artists the movement of materials in the past can be directly investigated. This study is an attempt to characterise and provenance the excavated pigments from Fem Cave, Chillagoe, Southeast Cape York Peninsula. Two techniques, Fourier transform infrared -photoacoustic spectroscopy and proton induced X-ray and gamma-ray emission spectroscopy, have been used to examine the mineralogy and elemental composition of earth pigments. Both these techniques are suited to the examination of solid samples, requiring only very small samples (
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Lin, Jim-Wein, and 林雋文. "CO2 Laser Photoacoustic Spectrometry and Its Application to Gas Detection." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/54721532921447822052.

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博士
國立清華大學
電機工程學系
97
The CO2 laser-based photoacoustic (PA) spectrometry has played an important role in a wide variety of applications, such as the detection of motor-vehicle and industrial exhausts, air pollution monitoring, trace gas sensing in the growth of plants, and so forth. With development of laser-spectroscopic gas sensors, the infrared gas analysis techniques are attracting lots of interest in medicine and biology in recent years. These include breath analysis for animals or human beings, medical diagnostics, and biological processes in living organisms, etc. For some specific molecular species, the use of CO2 laser PA method was still proven to be valuable in sensitivity and multi-component analysis. The successful examples of CO2 laser PA detection may imply the possibilities for future potential applications. This thesis reports the construction of an automatic CO2 laser PA spectrometer which uses a RF-excited waveguide CO2 laser. Operating in a waveguide mode can obtain higher gain per unit length, reduced physical size, and larger linewidth, thus increasing the probability of overlap between laser transitions and gas absorption spectrum. RF excitation provides additional advantages of low-voltage operation, improved lifetime and better overall efficiency. To increase the sensitivity, we put the small PA cell inside the laser cavity while operating in nonresonant mode. In addition, a number of new applications for trace-gas detection by CO2 laser PA spectrometry have also been proposed in this study. The use of this PA method for detecting the methanol contents in alcohol beverages is first presented. The calibration curves for methanol and ethanol were established by selecting three laser transitions. A series of samples referring to adulterated alcoholic beverages were measured and the concentrations of methanol and ethanol could be derived by the PA spectra. These results show great promise for diagnosis of adulterated wine by using CO2 laser PA spectrometry (error < 5.89%). This idea can be applied further for the detection of some volatile organic compounds, such as methanol/gasoline blends, gasoline contamination in water, acetone pollution, and even alcohol breath analysis. Compared to traditional gas chromatography, the PA scheme provides fast and easy operation without pre-treatment of toxic chemicals. Also, the spectroscopic method offers reliable and multi-component analysis in comparison with common chemical gas sensors. The preliminary measurements can be an experimental reference for future work.
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Books on the topic "Photoacoustic spectrometer"

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Zhan, Xiaowei. High resolution photoacoustic titanium: Sapphire/dye ring laser spectrometer and its application to acetylene overtone spectrum. Helsinki: Suomalainen Tiedeakatemia, 1993.

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Book chapters on the topic "Photoacoustic spectrometer"

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Kornilov, S. T., I. V. Ostrejkovskij, and E. D. Protsenko. "Optothermal Laser Spectrometer." In Photoacoustic and Photothermal Phenomena II, 517–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-540-46972-8_132.

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Gordon, S. H., R. V. Greene, and C. Pareja. "Modification of a Conventional Fourier Transform Infrared Spectrometer for Enhanced Photoacoustic Detection." In Photoacoustic and Photothermal Phenomena III, 572–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-540-47269-8_147.

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Plamann, K., K. Giese, B. Sennhenn, N. Harendt, and K. Kölmel. "In Vivo Evaluation of the Human Skin Permeation of Topically Applied Light Absorbing Agents by a Mirage Effect Spectrometer." In Photoacoustic and Photothermal Phenomena III, 92–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-540-47269-8_25.

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Mandelis, A., and J. F. Power. "Frequency Modulation Time Delay Photopyroelectric Spectrometry (FM-TD P 2ES)." In Photoacoustic and Photothermal Phenomena, 456–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-540-48181-2_121.

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Franko, M., and C. D. Tran. "Characterization of Chemical Reactions by Thermal Lens Spectrometry." In Photoacoustic and Photothermal Phenomena III, 273–75. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-540-47269-8_69.

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Tran, C. D. "Analytical Thermal Lens Spectrometry: Past, Present and Future Prospects." In Photoacoustic and Photothermal Phenomena III, 463–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-540-47269-8_117.

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Power, J. F. "Amplitude and Phase Modulation (AM-PM) Wideband Photothermal Spectrometry." In Photoacoustic and Photothermal Phenomena II, 479–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-540-46972-8_122.

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Chen, Z., and A. Mandelis. "Rate-Window Transient Thermomodulation Spectrometry: Technique and Measurements in Semiconductors." In Photoacoustic and Photothermal Phenomena III, 556–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-540-47269-8_142.

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Yu, Yang, Shuo Wu, Guohua Zhang, and Peixin Sun. "Study on Wave Filtering of Photoacoustic Spectrometry Detecting Signal Based on Mallat Algorithm." In Advances in Computer Science, Environment, Ecoinformatics, and Education, 347–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23321-0_54.

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Marcott, Curtis, Gloria M. Story, Anthony E. Dowrey, Robert C. Reeder, and Isao Noda. "Photoacoustic Depth Profiling, Dynamic Rheo-optics, and Spectroscopic Imaging Microscopy of Polymers by Step-Scanning FT-IR Spectrometry." In Progress in Fourier Transform Spectroscopy, 157–63. Vienna: Springer Vienna, 1997. http://dx.doi.org/10.1007/978-3-7091-6840-0_19.

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Conference papers on the topic "Photoacoustic spectrometer"

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Telles, Edjar M., Edson Bezerra, and Artemio Scalabrin. "Photoacoustic spectrometer for ozone detection." In IV Iberoamerican Meeting of Optics and the VII Latin American Meeting of Optics, Lasers and Their Applications, edited by Vera L. Brudny, Silvia A. Ledesma, and Mario C. Marconi. SPIE, 2001. http://dx.doi.org/10.1117/12.437157.

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Willing, B., P. Muralt, and O. Oehler. "Infrared gas spectrometer based on a pyroelectric thin film array detector." In PHOTOACOUSTIC AND PHOTOTHERMAL PHENOMENA. ASCE, 1999. http://dx.doi.org/10.1063/1.58065.

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Pilgrim, Jeffrey S., and David S. Bomse. "Diode Pumped Solid State Laser Photoacoustic Spectrometer." In Advanced Solid State Lasers. Washington, D.C.: OSA, 2001. http://dx.doi.org/10.1364/assl.2001.me4.

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Buma, Takashi. "Photoacoustic Microscopy using a Scanning Fourier Transform Spectrometer." In 2020 IEEE International Ultrasonics Symposium (IUS). IEEE, 2020. http://dx.doi.org/10.1109/ius46767.2020.9251825.

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Menduni, Giansergio, Andrea Zifarelli, Michele Di Gioia, Marilena Giglio, Pietro Patimisco, Angelo Sampaolo, Cristoforo Marzocca, Vittorio Passaro, and Vincenzo Spagnolo. "Quartz enhanced photoacoustic spectrometer for natural gas composition analysis." In Photonic Instrumentation Engineering IX, edited by Yakov Soskind and Lynda E. Busse. SPIE, 2022. http://dx.doi.org/10.1117/12.2608868.

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Li, Shaocheng, Qingxu Yu, Zhibin Chen, and Junxiu Lin. "Sensitive intracavity photoacoustic spectrometer based on CO 2 waveguide laser." In Optics and Optoelectronic Inspection and Control: Techniques, Applications, and Instruments, edited by Guang Hui Wei and Sheng Liu. SPIE, 2000. http://dx.doi.org/10.1117/12.401777.

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Lamard, Laurent, David Balslev-Harder, Andre Peremans, Jan C. Petersen, and Mikael Lassen. "Photoacoustic spectrometer based on widely tunable mid-infrared pulsed optical parametric." In CLEO: Science and Innovations. Washington, D.C.: OSA, 2019. http://dx.doi.org/10.1364/cleo_si.2019.sw3l.6.

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Arnold, I. J., H. Moosmüller, N. Sharma, and C. Mazzoleni. "Development of a supercontinuum-based photoacoustic spectrometer for characterization of atmospheric aerosol optics." In Optical Instrumentation for Energy and Environmental Applications. Washington, D.C.: OSA, 2013. http://dx.doi.org/10.1364/e2.2013.ew2a.4.

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Romann, Albert, and Markus W. Sigrist. "Continuously tunable frequency-doubled CO2-laser-based photoacoustic spectrometer for trace gas detection." In International Symposium on Biomedical Optics, edited by Alexander A. Oraevsky. SPIE, 2002. http://dx.doi.org/10.1117/12.469856.

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Wang, Qiaoyun. "An All-Optical Photoacoustic Spectrometer for Remote Detection of Acetyelene Gas in Power Transformer." In 2011 Symposium on Photonics and Optoelectronics (SOPO 2011). IEEE, 2011. http://dx.doi.org/10.1109/sopo.2011.5780682.

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Reports on the topic "Photoacoustic spectrometer"

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Dubey, M., S. Springston, A. Koontz, and A. Aiken. Photoacoustic Soot Spectrometer (PASS) Instrument Handbook. Office of Scientific and Technical Information (OSTI), January 2013. http://dx.doi.org/10.2172/1226795.

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Kotovsky, J. A Micro-Opto-Mechanical Photoacoustic Spectrometer. Office of Scientific and Technical Information (OSTI), October 2008. http://dx.doi.org/10.2172/950094.

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