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Littérature scientifique sur le sujet « Noice spectroscopy »

Auteur : Grafiati

Publié le 10 mars 2023

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Articles de revues sur le sujet "Noice spectroscopy"

Chao Shen, Chao Shen, Yujun Zhang Yujun Zhang et Jiazheng Ni Jiazheng Ni. « Real-time adaptive noise cancelling for signal-to-noise enhancement in direct absorption spectroscopy ». Chinese Optics Letters 11, n^o 7 (2013) : 073001–73004. http://dx.doi.org/10.3788/col201311.073001.

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Velichko, E. N., O. I. Kotov, E. K. Nepomnyashchaya, A. N. Petrov et A. V. Sokolov. « On Basic Requirements to Main Elements of Laser Correlation Spectrometer ». Journal of the Russian Universities. Radioelectronics 23, n^o 1 (28 février 2020) : 83–95. http://dx.doi.org/10.32603/1993-8985-2020-23-1-83-95.

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Introduction. Laser correlation spectroscopy is a promising method that allows one to analyze sizes of nanoparticles and to evaluate their shape and dynamics of aggregation in liquids. A limited usage of laser correlation spectroscopy is currently caused by insufficient accuracy of existing instruments and data processing algorithms. The paper described the development of laser correlation spectroscopic hardware complex designed for nanoparticles size determination in liquids. The basic requirements for the elements of the device and the approaches used to calculate the signal-to-noise ratio were discussed. The achieved parameters of the laser correlation spectrometer were presented.Aim. To develop the hardware for nanoparticles size determination in liquids and to optimize the parameters of hardware elements to increase signal-to-noise ratio.Materials and methods. Theory of dynamic light scattering to describe scattering of laser radiation in liquids was applied. Fundamental requirements for the elements of the laser correlation spectrometer were described.Results. An original scheme of the laser correlation spectrometer was developed, the basic requirements for the general scheme elements were described. Equations for calculating signal-to-noise ratio were given.Conclusion. The analysis of the main parameters of the elements of the laser correlation spectroscopic scheme were carried out. It helps one to evaluate the expected signal-to-noise ratio in laser correlation spectrometers.

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Hu, Mengyuan, Andrea Ventura, Juliano Grigoleto Hayashi, Francesco Poletti et Wei Ren. « Mid-Infrared Frequency Modulation Spectroscopy of NO Detection in a Hollow-Core Antiresonant Fiber ». Photonics 9, n^o 12 (3 décembre 2022) : 935. http://dx.doi.org/10.3390/photonics9120935.

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Mid-infrared frequency modulation spectroscopy (FMS) in a tellurite hollow-core antiresonant fiber (HC-ARF) is investigated for gas detection. The spectroscopic system is demonstrated for nitric oxide (NO) detection by exploiting its strong absorption line at 1900.08 cm−1 with a quantum cascade laser (QCL). By modulating the injection current of the QCL at 250 MHz and measuring NO in a 35 cm long HC-ARF, we achieve a noise equivalent concentration of 67 ppb at an averaging time of 0.1 s. Compared to direct absorption spectroscopy with a low-pass filter for etalon noise reduction, the FMS technique shows an improvement factor of 22. The detection limit of FMS can be further improved to 6 ppb at a longer averaging time of 100 s, corresponding to a noise equivalent absorption coefficient of 1.0 × 10−7 cm−1.

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Weng, Kanxing, Bin Wu, Feichen Wang, Xiaohui Zhang, Yin Zhou, Bing Cheng et Qiang Lin. « The Influence of Temperature on Frequency Modulation Spectroscopy in Atom Gravimeter ». Sensors 22, n^o 24 (16 décembre 2022) : 9935. http://dx.doi.org/10.3390/s22249935.

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Atom gravimeters use locked lasers to manipulate atoms to achieve high-precision gravity measurements. Frequency modulation spectroscopy (FMS) is an accurate method of optical heterodyne spectroscopy, capable of the sensitive and rapid frequency locking of the laser. Because of the effective absorption coefficient, Doppler broadening and susceptibility depend on temperature, and the signal-to-noise ratio (SNR) of the spectroscopy could be affected by temperature. We present a detailed study of the influence of the temperature on FMS in atom gravimeters, and the experimental results show that the SNR of the spectroscopy is dependent on temperature. In this paper, the frequency of the reference laser is locked by tracking the set point of the fringe slope of FMS. The influence of the frequency-locking noise of the reference laser on the sensitivity of the atom gravimeter is investigated by changing the temperature of the Rb cell without extra operations. The method presented here could be useful for improving the sensitivity of quantum sensors that require laser spectroscopic techniques.

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Aleksandrov, E. B., et V. S. Zapasskii. « Spin Noise Spectroscopy ». Journal of Physics : Conference Series 324 (21 octobre 2011) : 012002. http://dx.doi.org/10.1088/1742-6596/324/1/012002.

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Paldus, Barbara A., et Alexander A. Kachanov. « An historical overview of cavity-enhanced methods ». Canadian Journal of Physics 83, n^o 10 (1 octobre 2005) : 975–99. http://dx.doi.org/10.1139/p05-054.

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An historical overview of laser-based, spectroscopic methods that employ high-finesse optical resonators is presented. The overview begins with the early work in atomic absorption (1962) and optical cavities (1974) that led to the first mirror reflectivity measurements in 1980. This paper concludes with very recent extensions of cavity-enhanced methods for the study of condensed-phase media and biological systems. Methods described here include cavity ring-down spectroscopy, integrated cavity output spectroscopy, and noise-immune cavity-enhanced optical heterodyne molecular spectroscopy. Given the explosive growth of the field over the past decade, this review does not attempt to present a comprehensive bibliography of all work published in cavity-enhanced spectroscopy, but rather strives to illustrate the rich history, creative diversity, and broad applications potential of these methods. PACS No.: 39.30.+w

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Ishibe, Kiyoshiro, Satoru Nakada, Yutaka Mera et Koji Maeda. « Nanoprobe Fourier-Transform Photoabsorption Spectroscopy Using a Supercontinuum Light Source ». Microscopy and Microanalysis 18, n^o 3 (3 mai 2012) : 591–95. http://dx.doi.org/10.1017/s1431927612000219.

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AbstractA scheme of photoabsorption spectroscopy based on scanning tunneling microscopy (STM) has been developed by using a supercontinuum light as the wideband light source of a Fourier transform interferometer for spectroscopic measurements. The performance was demonstrated for a sample of GaAs. The proof-of-concept test showed that the use of the supercontinuum light instead of halogen lamps greatly enhances the signal-to-noise ratio due to the high brilliance of the supercontinuum light emitted from a small core of the photonic crystal fiber that enables tight focusing of the spectroscopy light onto the sample beneath the STM tip.

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Peng, Zhimin, Yanjun Du et Yanjun Ding. « Highly Sensitive, Calibration-Free WM-DAS Method for Recovering Absorbance—Part I : Theoretical Analysis ». Sensors 20, n^o 3 (26 janvier 2020) : 681. http://dx.doi.org/10.3390/s20030681.

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The absorbance is of great importance in the tunable diode laser absorption spectroscopy (TDLAS) as it contains information of both gas properties and spectroscopic parameters. A novel, calibration-free wavelength modulation-direct absorption spectroscopy (WM-DAS) is proposed and experimentally verified in this two-part paper. This method combines the capability of absorbance measurement from DAS and the advantages of enhanced noise rejection and high sensitivity from WMS. In this Part I, we focus on the full theoretical basis and procedures of this method from the following three aspects: the high-accuracy characterizations of laser frequency and intensity, noise rejection ability by extracting the characteristic spectra through the fast Fourier transform (FFT) of the light intensity, and the simultaneous fitting strategy for both baseline and absorbance. The preliminary validation experiment of CO transition at 4300.6999 cm−1 in a static gas cell shows the high accuracy of the proposed method.

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Starosielec, Sebastian, et Daniel Hägele. « Ultrafast spin noise spectroscopy ». Applied Physics Letters 93, n^o 5 (4 août 2008) : 051116. http://dx.doi.org/10.1063/1.2969041.

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Ferrie, Chris, Chris Granade, Gerardo Paz-Silva et Howard M. Wiseman. « Bayesian quantum noise spectroscopy ». New Journal of Physics 20, n^o 12 (5 décembre 2018) : 123005. http://dx.doi.org/10.1088/1367-2630/aaf207.

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Thèses sur le sujet "Noice spectroscopy"

Costantino, Mauro. « Low-frequency noise spectroscopy as an effective tool for electric transport analysis ». Doctoral thesis, Universita degli studi di Salerno, 2018. http://elea.unisa.it:8080/xmlui/handle/10556/4375.

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2016 - 2017
In this work, several experiments and analyses performed by means of noise spectroscopy, on a broad typology of materials and compounds, are presented. Structural, DC electrical transport and noise properties are exposed for each investigated sample, and theoretical models and possible explanations of the experimental results are given to unravel physical phenomena. In particular, two distinct types of iron-chalcogenide superconductors are investigated, in their pristine and aged state, suggesting the more likely mechanism which generates the resistance fluctuations and resorting to Weak Localization theory. In the case of the polymer/carbon nanotubes composites, the fluctuation-induced tunneling model is introduced to explain the measured temperature dependence of the electrical conductance and the I-V curve behaviors. Then, noise measurements prove the existence of a structural phase transition occurring around 160 K within the perovskite compound and highlight the correlation between electronic defect states distribution and device performance. The variety of investigated devices and materials validates the soundness of the noise spectroscopy as an effective tool for electric transport analysis. [edited by author]
XXX ciclo

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Pedurand, Richard. « Instrumentation for Thermal Noise Spectroscopy ». Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1356.

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La résolution des interféromètres gravitationnels est limitée par le mouvement Brownien - ou bruit thermique - de leurs miroirs dans la partie centrale de leur bande de détection, entre 10Hz et 1kHz. La répartition en fréquence de ce bruit thermique est dictée par les mécanismes de dissipation d'énergie mécanique à l'origine de cette vibration aléatoire, en accord avec le théorème fluctuation-dissipation. Cette dissipation provient principalement des revêtements optiques déposés sur les miroirs pour leur donner leur réflectivité. Dans le but de réduire le bruit thermique, une nouvelle génération de détecteurs d'ondes gravitationnelles employant des miroirs refroidis à température cryogénique a été proposée. Le développement de nouveaux matériaux optiques en couche mince à faible dissipation mécanique, opérant à la fois à température ambiante et température cryogénique, demande donc de nouveaux outils expérimentaux. L'objet principal de cette thèse est la construction d'un nouvel instrument, le CryoQPDI, qui consiste en l'association d'un interféromètre haute résolution et d'un cryostat basé sur un refroidisseur pulse tube. Il est capable de mesurer directement le mouvement Brownien d'un microlevier entre 300 K et 7 K. En combinant des mesures effectuées sur un microlevier avant et après le dépôt d'une couche mince, il est possible de caractériser la dissipation mécanique interne de cette couche mince. Cet instrument participera ainsi à l'optimisation des revêtements optiques des futurs interféromètres gravitationnels, dans le but de minimiser les nuisances dues au bruit thermique
The resolution limit of gravitational wave interferometers is set by their mirrors' Brownian motion – or thermal noise - in the central part of their detection band, from 10Hz to 1kHz. This thermal noise frequency distribution is given by the mechanical energy dissipation mechanisms it originates from, in agreement with the fluctuation-dissipation theorem. This dissipation mainly derives from the optical coatings deposited on the mirrors to give them their reflectivity. To reduce this thermal noise, a new generation of gravitational wave detectors employing mirrors cooled to cryogenic temperature has been suggested. The development of new optical thin-film materials with low mechanical dissipation, operating at both room and cryogenic temperatures, therefore requires new experimental tools. The main object of this thesis is the construction of a new instrument, the CryoQPDI, which is an association between a high-resolution interferometer and a cryostat based on a pulse tube cooler. It can directly measure the Brownian motion of a microcantilever between 300 K and 7 K. By combining measurements made on a microcantilever before and after the deposition of a thin film, it is possible to characterize the internal mechanical dissipation of this thin film. This instrument will eventually contribute to the optimisation of optical coatings of future gravitational wave detectors, aiming at minimizing the limitations due to thermal noise

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Sung, Youngkyu. « Non-Gaussian noise spectroscopy with superconducting qubits ». Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120365.

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Thesis: S.M. in Computer Science and Engineering, Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 91-95).
Most quantum control and quantum error-correction protocols assume that the noise causing decoherence is described by Gaussian statistics. However, the Gaussianity assumption breaks down when the quantum system is strongly coupled to a sparse environment or has a non-linear response to external degrees of freedom. Here, we experimentally validate an open-loop quantum control protocol that reconstructs the higher-order spectrum of a non-Gaussian dephasing process using a superconducting qubit as a noise spectrometer. This experimental demonstration of non-Gaussian noise spectroscopy protocol represents a major step towards the goal of demonstrating a complete noise spectral characterization of quantum devices.
by Youngkyu Sung.
S.M. in Computer Science and Engineering

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Nafaa, Beya. « Etude du bruit électrique basse fréquence dans des technologies CMOS avancées ». Thesis, Normandie, 2018. http://www.theses.fr/2018NORMC273/document.

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Les travaux réalisés pendant cette thèse se focalisent sur l'étude de transistors double grille UTBOX complètement délpétés fabriqués pour le nœud technologique 16 nm. Les performances de ces composants en courant continu et en fonction de la température ont été évaluées. Les pièges localisés dans le film de silicium ont été identifiés à l’aide de la spectroscopie de bruit basse fréquence, donnant ainsi la possibilité d'évaluer les étapes de fabrications afin de les optimiser. Un pic inhabituel de transconductance a été observé dans les caractéristiques de transfert obtenues à faibles températures (77 K et 10 K). Ce phénomène est plus probablement lié à un effet tunnel à travers des dopants diffusés à partir des extensions de source et drain dans le canal. Le mécanisme de transport quantique relié à la dégénérescence de niveaux d'énergie dans la bande de conduction a été mis en évidence à température cryogéniques et à très faibles polarisations. Une nouvelle approche théorique valide en inversion modérée a été développée pour les modèles de fluctuations de mobilité et de fluctuations de mobilité corrélés aux fluctuations du nombre de porteurs. Les résultats indiquent que le changement du mécanisme de transport des porteurs est accompagné par un changement du mécanisme du bruit en 1/f
The work done during this thesis focuses on the study of fully depleted double gate UTBOX transistors manufactured for the 16 nm technology node. The performances of these components in DC and as a function of temperature were evaluated. The traps located in the silicon film have been identified using low frequency noise spectroscopy, giving the possibility of evaluating the manufacturing steps in order to optimize them. An unusual peak of transconductance was observed in the transfer characteristics obtained at low temperatures (77 K and 10 K). This phenomenon is most likely related to a tunneling effect through dopants scattered from the source and drain extensions in the channel. The quantum transport mechanism related to the degeneracy of energy levels in the conduction band has been demonstrated at cryogenic temperatures and at very low polarizations. A new theoretical approach valid in moderate inversion has been developed for models of mobility fluctuations and mobility fluctuations correlated with the number of carriers fluctuations. The results indicate that the change in carrier transport mechanism is accompanied by a change in the 1 / f noise mechanism

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Vartabi, Kashanian Samir. « Spectroscopie de bruit avec de grands nuages d'atomes froids ». Thesis, Université Côte d'Azur (ComUE), 2016. http://www.theses.fr/2016AZUR4059/document.

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Nuage d'atomes de rubidium refroidi par laser. Ces mesures fournissent des informations sur la sourceet sur le milieu de propagation. Je considère une configuration particulière en transmission, le laserse propageant au travers du nuage atomique. Cette géométrie est pertinente pour étudier différentespropriétés, comme le mouvement des atomes. Cependant, le bruit intrinsèque du laser a unecontribution importante sur les spectres de bruit. Ce bruit technique peut alors devenir gênant pourextraire le signal étudié et une bonne compréhension du phénomène est donc essentielle.Expérimentalement, les spectres de bruit en intensité montrent un comportement différent auxfréquences basses et hautes. Alors que l'on observe la conversion "standard" du bruit de fréquence enbruit d'intensité pour les fréquences basses, la résonance atomique correspondant à un discriminateurde fréquence, des différences apparaissent à hautes fréquences. Nous montrons qu'une approche dechamp moyen, en associant une susceptibilité électrique au nuage atomique, est suffisante pourexpliquer les observations. Partant de ce modèle, les spectres permettent d'extraire des informationsquantitatives sur le laser et sur le nuage atomique. Ceci est connu sous le nom de spectroscopie debruit.La perspective est d'utiliser ces mesures de bruit afin d'obtenir une signature claire du laser aléatoireà atomes froids en étudiant la cohérence temporelle de la lumière émise. Cette thèse expose unerevue du phénomène de laser aléatoire, en particulier sur le laser à atomes froids et ses propriétés decohérence
In this thesis, I present some measurements of fluctuations of light after interaction with a cloud oflaser-cooled rubidium atoms. These measurements can provide useful information on the sourceitself as well as on the medium in which light propagates. I address a particular configuration inwhich intensity noise are measured on a laser beam transmitted through the atomic cloud. Thisgeometry is relevant to investigate different properties, such as the atomic motion. However, in ourexperiment the intrinsic noise of the incident laser has an important contribution to the detected noisespectrum. This technical noise may be hard to distinguish from the signal under study and a goodunderstanding of this process is thus essential.Experimentally, the intensity noise spectra show a different behavior for low and high Fourierfrequencies. Whereas one recovers the "standard" frequency to intensity conversion at lowfrequencies, due to the atomic resonance as a frequency discriminator, some differences appear athigh frequencies. We show that a mean-field approach, which corresponds to describing the atomiccloud by a dielectric susceptibility, is sufficient to explain the observations. Using this model, thenoise spectra allow to extract some quantitative information on the laser noise as well as on theatomic sample. This is known as noise spectroscopy.The perspective of this thesis aims at applying noise measurement to obtain complementarysignatures of the cold-atom random laser by studying the temporal coherence of the emitted light.The manuscript therefore outlines a review on random laser phenomena with a focus on cold-atomrandom lasers and its coherence properties

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Dang, Dung Do. « Tuneable Diode Laser Absorption Spectroscopy with Optical Fiber : Noise Analysis and Noise Reduction ». Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2006. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13089.

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A prototype of a fiber based absorptionspectroscopy instrument is built. A single mode fiber pigtailDistributed Feedback laser (DFB) is used to scan a known$mbox{NH}_3$ absorption line near $1512nm$ ($6614cm^{-1}$). $2mm$diameter InGaAs PIN photodiodes are used to convert the light signalto electrical signals by use of special designed transimpedanceamplifiers. Laser modulation, coherent detection at twice themodulation frequency (second harmonic detection), other electronics,and digital signal processing are provided by Norsk Elektrooptikk.bigskip The DFB laser from NEL (NLK1S5EAAA) delivers 10mW fiberoutput and has maximum output around 30mW at maximum injectioncurrent of 200mA. This laser was found to be very quiet at dcoperation. However, in wavelength modulation spectroscopy operationit exhibit large modulation noise that was found to stem from thefiber coupling inside the laser module. A detection limit of$6times10^{-5}$ to $1times10^{-4}$ in absorbance unit with 0.712moptical path length and an effective measurement bandwidth of 52Hzwas achieved by this laser. This is significantly above thedetection limit with free air lasers which achieve $3times10^{-6}$relative absorbance (0.15ppm $mbox{NH}_3$ at room temperature andatmospheric pressure). The acquisition time for each concentrationmeasurement takes 3.2s. Hence, the response time is very fast whichis a common property of wavelength modulation spectroscopy.bigskip The modulation noise problem was attacked by an electronicnoise cancellation scheme. The idea was that since the noise sourceis inside the laser module and no external optical component can beused to reduce it. With great linearity and reliability propertiesof fused biconical taper (FBT) couplers the laser beam is split intotwo identical beams with nearly equal amount of the same noise. Onebeam, signal beam, is used to induce second harmonic signals in thegaseous path. The other beam goes directly to an identicalphotodetector and is used as a reference signal. Two specialdesigned noise canceller circuits were built to remove commonsignals. Both the circuits, based on current subtraction (notoptimized) or voltage subtraction, give comparable results. Themodulation noise was reduced by more than 12dB. A detection limit of$5times10^{-6}$ was achieved with this prototype. Even aftertransmitting the laser beam through a 3200 meter single mode fiber asignal to noise ratio (relative to 100ppm signal) of $180times$.Hence, a sensitivity is $1.1times10^{-5}$ in absorbance unit wasachieved with the basic noise canceller (not optimized). Thiscorresponds to a detection limit of 0.55ppm ammonia (12.5ppm withoutcancellation). The optimized noise canceller could reduce this by afactor of 3 or more.bigskipThe basic noise canceller based on current domain subtraction wasinvestigated in detail and optimized. This new circuit suppressedthe intensity modulation signal by more than 70dB. The 2f noise wasreduced to approximately 50ppb or $1.1times10^{-6}$ in absorbanceunit with an effective noise bandwidth of 52.3Hz and 1m optical pathlength. This is a record sensitivity with such simple electronics.The sensitivity of our fiber based prototype is limited by thefluctuating etalon fringing in the signal beam. Under normaloperation the prototype achieves approximately $pm20$ppb zero pointdrift in the concentration with an acquisition time of 48s (3.5Hznoise bandwidth). By our knowledge these results are the bestavailable and are competitive with the much more complex frequencymodulation spectroscopy technique.bigskipThese balanced transimpedance amplifiers also have the ability tomeasure the absorption spectra directly without modulation.Determining the absorption linewidth and its shape is now a straightforward task. By use of dual beam configuration and noisecancellation thermal effects that caused background fluctuationswere greatly suppressed. The laser delivers high intensity light,$sim22mW$. The dominating noise is the photocurrent shot noise andthe etalon fringing from optical components in the signal path.Remote sensing, in-situ, noninvasive measurements can be performedwith this instrument. In some cases it's flexibility, and remotesensing possibility are of great attractiveness for the industry.The sensitivity is also improved by a factor of two with the fiberbased tuneable diode laser absorption spectroscopy instrument.bigskipIn the end of this thesis we demonstrate the ability to measuremultiple absorption lines simultaneously. The number of measurementpaths is limited by the laser output power.

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Chen, Zilong 1981. « Towards qubit noise spectroscopy by quantum bang-bang control ». Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/32721.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, June 2004.
Includes bibliographical references (p. 89-91).
Quantum bang-bang control is a method of suppressing decoherence in qubits [VKL99, VL98]. To date, mathematically rigorous treatments of quantum bang-bang control offered little intuition. To complement existing approaches and to seek better understanding, I present intuitive pictures to think about quantum bang-bang control. In addition, I develop a formalism for treating phase noise moments of a qubit under quantum bang-bang control. Although the desired purpose of quantum bang-bang control is to remove noise, it is conceivable that it can be used to infer information about the noise process and coupling on a qubit. By using a simple random rotation model of single qubit dephasing, I demonstrate how quantum bang-bang control can distinguish between dephasing under different stochastic processes. I also show how quantum bang-bang control can determine noise coupling in a toy model where noise couples to the qubit via a fixed noise axis. These two demonstrations indicate the potential of quantum bang-bang control as a tool for qubit noise spectroscopy.
by Zilong Chen.
S.B.

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Žáčik, Michal. « Šumová spektroskopie pro biologii ». Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-219949.

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This thesis contains glossary topic of spectroscopic measurement methods in broad bands of frequency. There is designed experimental measurement method for simple samples and biological samples measurements for noise spectroscopy in frequency range of 0,1 – 6 GHz, using broadband noise generator. There is realized the workplace and the measurement method is verified by measuring on selected samples. Measurements a displayed and analyzed.

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程曦敏 et Hei-man Anita Ching. « Detector noise reduction in positron doppler broadening related spectroscopy systems ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31225846.

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Ching, Hei-man Anita. « Detector noise reduction in positron doppler broadening related spectroscopy systems / ». Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25212114.

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Livres sur le sujet "Noice spectroscopy"

Cottis, Robert. Electrochemical impedance and noise. Huston, TX : NACE International, 1999.

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Florian, Mansfeld, Huet F, Mattos O. R et Electrochemical Society Corrosion Division, dir. New trends in electrochemical impedance spectroscopy (EIS) and electrochemical noise analysis (ENA) : Proceedings of the international symposium. Pennington, NJ : The Electrochemical Society, Inc., 2001.

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Glazov, M. M. Fluctuations of Electron and Nuclear Spins. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198807308.003.0010.

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In thermal equilibrium, both electron and nuclear spin systems are unpolarized on average, but characterized by nonzero fluctuations. These fluctuations are inevitable due to the quantum-mechanical nature of spin. The physics of spin fluctuations in electron and nucelar systems is studied in this chapter. The intensity and dynamics of these inevitable stochastic fluctuations of spins contain information on spin relaxation and decoherence times, spin precession period, and interactions in spin systems. The theory of spin fluctuations in semiconductor nanosystems as well as experimental advances in the field of spin noise spectroscopy are reviewed. Specific situations where the spin noise spectroscopy can be particularly useful for spin dynamics studies are discussed, the analysis of recent progress in the field of nonequlibrium spin fluctuations is also presented.

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Wichner, Brian D. Conversion of laser phase noise to amplitude noise in a Lummer-Gehrcke interferometer and in oxygen gas. 1998.

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(Editor), Barry C. Syrett, dir. Corrosion Testing Made Easy : Impedance & Noise Analysis. Natl Assn of Corrosion, 2002.

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Hawkes, Peter W. Advances in Electronics and Electron Physics (Advances in Imaging and Electron Physics). Academic Press, 1990.

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(Editor), Benjamin Kazan, dir. Advances in Electronics and Electron Physics (Advances in Imaging and Electron Physics). Academic Press, 1993.

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Hawkes, Peter W. Advances in Electronics and Electron Physics (Advances in Imaging and Electron Physics). Academic Press, 1988.

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Hawkes, Peter W. Advances in Electronics and Electron Physics (Advances in Imaging and Electron Physics). Academic Press, 1990.

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(Editor), Benjamin Kazan, dir. Advances in Electronics and Electron Physics (Advances in Imaging and Electron Physics). Academic Press, 1991.

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Chapitres de livres sur le sujet "Noice spectroscopy"

Schimel, David, Philip A. Townsend et Ryan Pavlick. « Prospects and Pitfalls for Spectroscopic Remote Sensing of Biodiversity at the Global Scale ». Dans Remote Sensing of Plant Biodiversity, 503–18. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-33157-3_19.

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AbstractImaging spectroscopy is a powerful new approach for observing aspects of the biological diversity of the Earth, conveying information about plant functional traits, habitat, and plant diversity itself. For decades, spectroscopic data suitable for this application have mainly been collected by aircraft. But in the next decade, global coverage from space by high-quality spectroscopic data will become available, preceded by instruments providing “global access”—not wall-to-wall coverage but data from almost anywhere in the world. For decades, scientists have experimented with and discussed optimal strategies for collecting spectroscopic data, but the next set of missions is now sufficiently well-defined that ecologists should consider how best to use the data that can now be expected. The anticipated flood of data will provide a new window on diversity, characterizing it in new ways that comprehensively sample space and change over time. Spectroscopic data will be peta-scale or larger, perhaps as much as 10 TB per day, and the data themselves will be high dimensional, requiring and allowing advanced big data techniques to be fully exploited. These data raise specific challenges such as how to characterize aggregate ecosystem characteristics, since the traits observed will change with phenology. Pixels will be fixed at ~30 m, 10–106 times larger than the plants they sample; other instrument objectives are likely in the range of 10 nm spectral sampling, coverage from 400 to 2500 nm with signal to noise in the range of 250–400. Imaging spectroscopy from space represents a huge opportunity for global ecology, but many conceptual, algorithmic, and theoretical issues will challenge the users.

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Kim, Jungsang, Seema Somani et Yoshihisa Yamamoto. « Sub-Shot-Noise FM Noise Spectroscopy ». Dans Nonclassical Light from Semiconductor Lasers and LEDs, 107–22. Berlin, Heidelberg : Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56814-5_8.

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Heidt, Alexander M., Dirk-Mathys Spangenberg, Anupamaa Rampur, Alexander Hartung et Hartmut Bartelt. « All-Normal Dispersion Fiber Supercontinuum : Principles, Design, and Applications of a Unique White Light Source ». Dans The Supercontinuum Laser Source, 299–341. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-06197-4_6.

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AbstractUltrafast and low-noise supercontinuum (SC) sources based on all-normal dispersion (ANDi) fibers are emerging as key-enabling technology for new applications in spectroscopy, microscopy, and ultrafast photonics. In this chapter we review the fundamental physics, fiber designs, and applications of this unique white light source.

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Giacobino, E., C. Fabre, H. Heidmann, R. Horowicz, S. Reynaud et G. Camy. « Squeezing Intensity Noise on Laser-like Beams ». Dans Laser Spectroscopy VIII, 154–55. Berlin, Heidelberg : Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-540-47973-4_40.

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Kim, Jungsang, Seema Somani et Yoshihisa Yamamoto. « Sub-Shot-Noise FM Spectroscopy ». Dans Nonclassical Light from Semiconductor Lasers and LEDs, 89–105. Berlin, Heidelberg : Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56814-5_7.

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Chu, Steven. « High-Noise, Low-Resolution Spectroscopy ». Dans Laser Physics at the Limits, 81–95. Berlin, Heidelberg : Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04897-9_8.

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Aldén, M., P. E. Bengtsson, H. Edner, S. Kröll, D. Nilsson et D. Sandell. « The Rotational Dual Broadband Approach and Noise Considerations in CARS Spectroscopy ». Dans Laser Spectroscopy VIII, 324–25. Berlin, Heidelberg : Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-540-47973-4_99.

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Meyer-Vernet, Nicole, Sang Hoang, Karine Issautier, Milan Maksimovic, Robert Manning, Michel Moncuquet et Robert G. Stone. « Measuring plasma parameters with thermal noise spectroscopy ». Dans Measurement Techniques in Space Plasmas : Fields, 205–10. Washington, D. C. : American Geophysical Union, 1998. http://dx.doi.org/10.1029/gm103p0205.

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Fort, Bernard. « On High Signal to Noise Spectroscopy with CCDs ». Dans The Impact of Very High S/N Spectroscopy on Stellar Physics, 49–53. Dordrecht : Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2937-1_10.

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Rogers, C. T., et R. A. Buhrman. « Characterization of Tunnel Barriers by Flicker Noise Spectroscopy ». Dans Advances in Cryogenic Engineering Materials, 489–98. Boston, MA : Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-9871-4_59.

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Actes de conférences sur le sujet "Noice spectroscopy"

Cicek, Erdem, Jason L. Johnson, Ant Ural, Gijs Bosman, Massimo Macucci et Giovanni Basso. « Defect Noise Spectroscopy Results for GaN Nanowires ». Dans NOISE AND FLUCTUATIONS : 20th International Conference on Noice and Fluctuations (ICNF-2009). AIP, 2009. http://dx.doi.org/10.1063/1.3140404.

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Macku, R., P. Koktavy, P. Skarvada, M. Raska, P. Sadovsky, Massimo Macucci et Giovanni Basso. « Diagnostics of Forward Biased Silicon Solar Cells Using Noise Spectroscopy ». Dans NOISE AND FLUCTUATIONS : 20th International Conference on Noice and Fluctuations (ICNF-2009). AIP, 2009. http://dx.doi.org/10.1063/1.3140416.

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Lakeev, Sergey G., Nina N. Peschanskaya, Vitalii V. Shpeiizman, Pavel N. Yakushev, Alexander S. Shvedov, Alexander S. Smolyanskii, Massimo Macucci et Giovanni Basso. « Flickering Noise Spectroscopy as a Powerful Tool for Investigation the Dynamics of the Deformation Processes in Solids ». Dans NOISE AND FLUCTUATIONS : 20th International Conference on Noice and Fluctuations (ICNF-2009). AIP, 2009. http://dx.doi.org/10.1063/1.3140417.

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Sparapassi, Giorgia, Jonathan Owen Tollerud, Filippo Glerean et Daniele Fausti. « Noise Correlation Spectroscopy for spectroscopic measurements of low energy modes ». Dans CLEO : Applications and Technology. Washington, D.C. : OSA, 2018. http://dx.doi.org/10.1364/cleo_at.2018.ath3o.7.

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Orrit, M., et J. Bernard. « Single Molecule Spectroscopy : Photon Correlation And Electric Field Effect. » Dans Spectral Hole-Burning and Luminescence Line Narrowing : Science and Applications. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/shbl.1992.ma3.

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The first single molecule detection, by Moerner and colleagues [1] in the system pentacene in p-terphenyl crystal via absorption, has been extremely difficult due to photon noise. In our paper [2], we demonstrated for the first time single molecule lines in fluorescence excitation spectra of the same system. This much simpler method provides a dramatic improvement of the signal/noise ratio. It opened the way for a true single molecule spectroscopy (SMS). Since then, several experiments performed using this technique [3-8] have shown the power and promise of this new spectroscopic method. In this report, we want to apply SMS to obtain detailed information about individual molecules and the differences in some spectroscopic properties due to their local surroundings. We also report on preliminary results on electric field effects on single molecule lines.

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Wang, Liang-guo, et Glen Sachse. « Molecular Oxygen Detection Using Frequency Modulation Diode Laser Spectroscopy ». Dans Laser Applications to Chemical Analysis. Washington, D.C. : Optica Publishing Group, 1990. http://dx.doi.org/10.1364/laca.1990.wa8.

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There are a variety of industrial and research applications for molecular oxygen (O2) sensors. Most existing oxygen sensors, however, are either intrusive and have slow response (e.g. electrochemical methods and mass spectrometry) or are expensive (e.g. UV laser-induced fluorescence). An attractive method for detecting O2 that is both non-intrusive and relatively inexpensive was first demonstrated by Kroll et al1 and involves the use of wavelength modulation (at 5 KHz) spectroscopy techniques with a GaAlAs diode laser. In this paper we extend this earlier work by making spectroscopic measurements of O2 using high frequency (≈1 GHz) modulation of GaAlAs lasers. This so-called frequency modulation spectroscopy (FMS) technique has the potential for achieving near quantum noise limited sensitivity and time response on the order of microseconds.

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Koktavy, Bohumil, et Pavel Koktavy. « Noise Spectroscopy of Mechanically Stressed Insulating Materials ». Dans NOISE AND FLUCTUATIONS : 19th International Conference on Noise and Fluctuations ; ICNF 2007. AIP, 2007. http://dx.doi.org/10.1063/1.2759687.

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Cruz, Maria-Luisa. « Layer-oriented CGH with attenuated speckle noise in focused-layers and reduced defocus noise ». Dans Applied Industrial Spectroscopy. Washington, D.C. : OSA, 2021. http://dx.doi.org/10.1364/ais.2021.jtu5a.24.

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Kubasek, Radek, et Mouin Al Khaddour. « Noise generator for noise spectroscopy ». Dans 2009 3rd International Conference on Signals, Circuits and Systems (SCS 2009). IEEE, 2009. http://dx.doi.org/10.1109/icscs.2009.5414167.

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Chou, Nee-Yin, et Glen W. Sachse. « Comparison of Theoretical Trace Gas Detection Sensitivities for Single-Tone and Two-Tone FM Spectroscopy Using Tunable Diode Lasers ». Dans Laser Applications to Chemical Analysis. Washington, D.C. : Optica Publishing Group, 1987. http://dx.doi.org/10.1364/laca.1987.tha2.

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Frequency modulation (FM) spectroscopy has been shown to be one of the fastest growing fields of highly sensitive spectroscopic techniques since it was first introduced by Bjorklund.1 Typically an external electro-optic phase modulator is used to modulate the laser output at radio frequencies where laser noise approaches the shot noise limit. This modulated beam is incident on the photodetector after passing through the absorbing medium. For pure FM, a beat- frequency absorption signal with zero background is obtained. Recently, Janik, Carlisle, and Gallagher2 have devised a new FM modulation/demodulation technique that retains the desirable high frequency modulation yet with low frequency detection. The technique involves simultaneous modulation of the laser beam with two different frequencies, thus the term two-tone modulation.

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Rapports d'organisations sur le sujet "Noice spectroscopy"

Roy, Dibyendu, Yan Li, Alex Greilich, Yu Pershin, Avadh B. Saxena et Nikolai Sinitsyn. Spin noise spectroscopy of quantum dot molecules. Office of Scientific and Technical Information (OSTI), mai 2013. http://dx.doi.org/10.2172/1079572.

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Buckingham, Michael J. Deep-Water Ambient Noise Profiling ; Marine Sediment Acoustics ; and Doppler Geo-Acoustic Spectroscopy. Fort Belvoir, VA : Defense Technical Information Center, septembre 2010. http://dx.doi.org/10.21236/ada542068.

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