Download or read book Automation of Coherent Anti Stokes Raman Spectroscopy CARS Probe Delay Scan Measurements written by and published by . This book was released on 2015 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Automation of Coherent Anti Stokes Raman Spectroscopy Probe Delay Scan Measurements written by and published by . This book was released on 2015 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coherent Raman Scattering Microscopy written by Ji-Xin Cheng and published by CRC Press. This book was released on 2016-04-19 with total page 603 pages. Available in PDF, EPUB and Kindle. Book excerpt: The First Book on CRS MicroscopyCompared to conventional Raman microscopy, coherent Raman scattering (CRS) allows label-free imaging of living cells and tissues at video rate by enhancing the weak Raman signal through nonlinear excitation. Edited by pioneers in the field and with contributions from a distinguished team of experts, Coherent Raman Sc
Download or read book Coherent Raman Spectroscopy Applications And New Developments Proceedings Of The Xi European Cars Workshop written by F Castellucci and published by World Scientific. This book was released on 1993-02-09 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: The meeting was a forum on the 'state of the art' of the fundamental aspects and the applications of Coherent Antistokes Raman Scattering (CARS) and related nonlinear optic techniques.This volume contains the works of outstanding scientists from the most distinguished research centers of universities, public and private institutions in Europe and other countries, who work on the theory and application of nonlinear laser spectroscopic techniques to the study of gas combustion kinetics, noninterfering flame temperature measurements, high temperature reactors, plasmas and the exciton and vibrational dynamics in condensed phases.
Download or read book Coherent Anti Stokes Raman Spectroscopy CARS written by and published by . This book was released on 1993 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coherent Anti-Stokes Raman Spectroscopy (CARS) has been accepted as a very useful tool in combustion diagnostics. CARS is an optical technique in which two powerful laser beams are brought to a focus over a very small region in a medium usually a flame. This produces an output laser-like beam arising from a specific interaction of the laser radiation with the molecules of the gases in the flame and the spectral characteristics of this beam contains information about the temperature and species present in the focal volume. The relevant information from the CARS spectra can be extracted only by comparing it with theoretically calculated spectra. A complex software package was developed for generating the theoretical CARS spectra and for analyzing the experimental spectra. This report describes the tasks undertaken to enhance the capabilities of the existing CARS software package with the aim of detecting species such as NO and O2.
Download or read book Coherent Anti stokes Raman Scattering CARS Optimized by Exploiting Optical Interference written by Wang, Xi and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this work is to study the interference between the coherent nonresonant four-wave-mixing (FWM) background and the Raman-resonant signal in the coherent anti-Stokes Raman spectroscopy (CARS). The nonresonant background is usually considered as a detriment to CARS. We prove that the background can be exploited in a controllable way, through the heterodyne detection due to the interference, to amplify the signal and optimize the spectral shape of the detected Raman signal, and hence enhance the measurement sensitivity. Our work is based on an optimized CARS technique which combines instantaneous coherent excitation of multiple characteristic molecular vibrations with subsequent probing of these vibrations by an optimally shaped, time-delayed, narrowband laser pulse. This pulse configuration mitigates the nonresonant background while maximizing the resonant signal, and allows rapid and highly specific detection even in the presence of multiple scattering. We investigate the possibility of applying this CARS technique to non-invasive monitoring of blood glucose levels. Under certain conditions we find that the measured signal is linearly proportional to the glucose concentration due to optical interference with the residual background light instead of a quadratic dependence, which allows reliable detection of spectral signatures down to medically-relevant glucose levels. With the goal of making the fullest use of the background, we study the interference between an external local oscillator (nonresonant FWM field) and the CARS signal field by controlling their relative phase and amplitude. Our experiment shows that this control allows direct observation of the real and imaginary components of the third-order nonlinear susceptibility (x(3)) of the Raman sample. In addition, this method can be used to amplify the signal significantly. Furthermore, we develop an approach by femtosecond laser pulse shaping to precisely control the interference between the Raman-resonant signal and its intrinsic nonresonant background generated within the same sample volume. This technique is similar to the heterodyne detection with the coherent background playing the role of the local oscillator field. By making fine adjustments to the probe field shape, we vary the relative phase between the resonant signal and the nonresonant background, and observe the varying spectral interference pattern. These controlled variations of the measured pattern reveal the phase information within the Raman spectrum, akin to holographic detection revealing the phase structure of a source.
Download or read book Coherent Anti Stokes Raman Spectroscopy CARS Gas Temperature Measurements in a Monodisperse Combusting Droplet Stream written by JunYong Zhu and published by . This book was released on 1991 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coherent Anti Stokes Raman Spectroscopy CARS Measurements in a Laminar Flame Coal Combustor written by Robert D. Hancock and published by . This book was released on 1989 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coherent Anti stokes Raman Spectroscopy written by Stanford University. Ginzton Laboratory and published by . This book was released on 1977 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simultaneous Temperature Measurements with Raman and CARS Coherent Antistokes Raman Scattering in Laminar Flames written by W. Stricker and published by . This book was released on 1986 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spatially resolved temperature measurements in laminar premixed flames were made using Coherent Antistokes Raman Scattering (CARS) and spontaneous Raman spectroscopy. In the case of narrowband (scanning) CARS, the experimental arrangement allows the performance of simultaneous temperature measurements with both techniques. For broadband (multiplex) CARS the measurements have to be made successively. Three different Raman linewidth models were used for CARS data evaluation. The results were compared with the independently recorded rotational Raman temperatures. Temperature differences up to 10% were observed, depending on the linewidth model used. For two, more complicated line-width models the CARS and Raman temperatures are in good agreement.
Download or read book Time resolved Coherent Anti Stokes Raman Spectroscopy CARS and the Measurement of Vibrational Spectra in Shock compressed Molecular Materials written by and published by . This book was released on 1990 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the use of coherent anti-Stokes Raman scattering (CARS) in conjunction with a two-stage light-gas gun to obtain vibrational spectra of shock-compressed liquid N2, O2, CO, and their mixtures. The experimental spectra are compared to spectra calculated using a semiclassical model for CARS intensities to obtain vibrational frequencies, peak Raman susceptibilities, and linewidths. The derived spectroscopic parameters suggest thermal equilibrium of the vibrational populations is established in less than a few nanoseconds after shock passage. Vibrational temperatures obtained are compared to those derived from equation-of-state calculations. Shifts in the vibrational frequencies reflect the influence of increased density and temperature on the intramolecular motion. 11 refs., 5 figs.
Download or read book Coherent Anti stokes Raman Spectroscopy System for Point Temperature and Major Species Concentration Measurement written by and published by . This book was released on 1993 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Coherent anti-Stokes Raman Spectroscopy system (CARS) has been developed as a laser-based, advanced, combustion-diagnostic technique to measure temperature and major species concentration. Principles of operation, description of the system and its capabilities, and operational details of this instrument are presented in this report.
Download or read book Coherent Anti stokes Raman Spectroscopic Probe of Combustion written by K. A. Marko and published by . This book was released on 1980 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conceptual Design Study for Coherent Anti Stokes Raman Spectroscopy CARS Diagnostics in the AMMRC Ballistic Compressor Facility written by John A. Shirley and published by . This book was released on 1980 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: A conceptual design of a diagnostic system using coherent anti-Stokes Raman Spectroscopy (CARS) to determine time resolved temperature and species concentrations in the Army Mechanics and Materials Research Center ballistic compressor has been formulated. Performance calculations have been carried out for hydrogen which is an ideal diagnostic species for this application. Results are also presented of computer code calculations of collision narrowed spectra of nitrogen. Several pump laser systems were compared, and a high repetition frequency Nd:YAG laser was determined to be superior. Population saturation, stimulated Raman gain, and optical breakdown are not expected to pose severe limitations on laser intensity or measurement signal-to-noise ratios. Consideration is given to problems pertinent to operation of the ballistic compressor including compressor recoil, window deflections and generation of CARS from the test section windows. Finally, the possibility of using pulsed stimulated Raman gain spectroscopy (SRGS) as an alternative to CARS at the high densities typical of the ballistic compressor has been identified. SRGS appears to offer adequate measurement ability and possesses certain advantages over CARS. (Author).
Download or read book The Application of Coherent Anti Stokes Raman Spectroscopy CARS to the Study of Heterogeneous Deactivation of Vibrationally excited Nitrogen written by Kimberly Ann Rimkus and published by . This book was released on 1993 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hyperspectral Coherent Anti Stokes Raman Scattering CARS Imaging written by Stefan Gomes da Costa and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Analysis of Coherent Anti Stokes Raman Spectroscopy as an Analytical Tool written by Ronald David Turner and published by . This book was released on 1976 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coherent Anti-Stokes Raman Spectroscopy (CARS) is a new type of Raman Spectroscopy. The phenomenon is associated with the nonlinear conversion of two laser beams in a medium into a third collimated beam at the anti-Stokes frequency of the medium. This analysis evaluates the performance capabilities of CARS under various experimental conditions for the molecules O2,N2,H2 and CO. Laser intensity fluctuations and shot noise are introduced as noise sources to predict signal-to-noise ratios (S/N). The S/N is evaluated as a function of the partial pressure of a gas to measure the performance of CARS. An analysis of the uncertainty in measuring the rotational temperature is presented for diatomic gases. Inverse bremsstrahlung in plasmas is investigated as a possible process by which the parameters measured by CARS might be altered. An experiment is discussed in which an attempt was made to remove the background signal inherent in most CARS experiments. Partial interferometric cancellation of two CARS signals was observed by the proper positioning of two sample cells in an otherwise standard CARS experiment.
