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Self-supporting Carbon Glass Films: A PAS Reference Sample 自支撑碳玻璃薄膜:PAS参考样品
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1007/978-3-663-06820-4_33
H. Coufal
{"title":"Self-supporting Carbon Glass Films: A PAS Reference Sample","authors":"H. Coufal","doi":"10.1007/978-3-663-06820-4_33","DOIUrl":"https://doi.org/10.1007/978-3-663-06820-4_33","url":null,"abstract":"","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"14 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125276654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simple Optoacoustic Energy Meter for Pulsed Lasers 脉冲激光器简易光声能量计
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tub9
R. Shaw
{"title":"Simple Optoacoustic Energy Meter for Pulsed Lasers","authors":"R. Shaw","doi":"10.1364/pas.1981.tub9","DOIUrl":"https://doi.org/10.1364/pas.1981.tub9","url":null,"abstract":"When a pulsed laser is utilized for spectroscopic or engineering applications, it often becomes necessary to measure the optical pulse energy (as opposed to instantaneous or peak power). This report details the design and performance of a unique energy meter for pulsed sources based on the optoacoustic (OA) phenomenon and a Helmholtz resonator (HR) cell (1,2). This new instrument accomplishes a time domain change, converting short optical pulses of varying duration into a slower acoustic pulse that can be measured with simple detection electronics. An inexpensive sample-and-hold amplifier was employed. The OA energy meter accurately produces a dc voltage corresponding to the energy/pulse of a single laser pulse or the average value for a train of pulses over a wide input pulse energy range.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121003936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Photoacoustic Cell Design for the IBM 9600 FTIR Instrument IBM 9600 FTIR仪器的光声电池设计
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tua4
J. Mcclelland, M. Iles, R. Kniseley, J. Casper
{"title":"Photoacoustic Cell Design for the IBM 9600 FTIR Instrument","authors":"J. Mcclelland, M. Iles, R. Kniseley, J. Casper","doi":"10.1364/pas.1981.tua4","DOIUrl":"https://doi.org/10.1364/pas.1981.tua4","url":null,"abstract":"A recently acquired IBM 9600 FTIR spectrometer is being equipped for photoacoustic measurements on condensed samples. A photoacoustic cell, designed for use in the instrument, has a number of important features to enhance the signal to noise ratio and optimize utility.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129321891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Determination of Trace Nd Species in Water using Laser-Induced Photoacoustic Spectroscopy 激光诱导光声光谱法测定水中痕量钕
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tua10
B. C. Raine, S. Brown
{"title":"Determination of Trace Nd Species in Water using Laser-Induced Photoacoustic Spectroscopy","authors":"B. C. Raine, S. Brown","doi":"10.1364/pas.1981.tua10","DOIUrl":"https://doi.org/10.1364/pas.1981.tua10","url":null,"abstract":"Accurate determination of stability constants for actinides is necessary for prediction of transport properties of nuclear waste. Since solubilities are generally low, these stability constants must be determined in dilute solution. We have used cw and pulsed laser-induced photoacoustic spectroscopy to study trace neodymium (III) in water and in aqueous carbonate media; the coordination chemistry of Nd(III) is similar to that of many actinide species, so that Nd(III) is a good model system.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115827106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Scanning photoacoustic microscopy using photothermal radiometric detection 使用光热辐射检测的扫描光声显微镜
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tub21
B. Stadler, J. Bille, P. Blatt, M. Frank, C. Rensch
{"title":"Scanning photoacoustic microscopy using photothermal radiometric detection","authors":"B. Stadler, J. Bille, P. Blatt, M. Frank, C. Rensch","doi":"10.1364/pas.1981.tub21","DOIUrl":"https://doi.org/10.1364/pas.1981.tub21","url":null,"abstract":"A thin film structure exposed to pulsewise illumination may experience pulsating temperature variations in its surface layers. The amplitude of those temperature fluctuations depends on the absorption spectrum of the sample and may be measured photothermally by observing similar pulsations in the thermal reradiation. The scanning photoacoustic microscope is based on this concept by incorporating a focused laser beam as the illumination source. With either He-Ne-3.39 μm- or CO2-10.6 μm-laser lines a spatial resolution of better than 0.1 mm can be achieved. For photothermal detection PXE-ceramics is used as infrared detector. Microscopy is carried out by recording the output of the lock-in amplifier as the sample is scanned mechanically in the x-y-plane. The aim of the work is the application of the photoacoustic technique to the evaluation of thermal properties of thin layered structures simulating human skin tissue. In collaboration with the medical school of the University of Heidelberg the possibility of developing a new specific thermographic method will be studied which should be applied for medical diagnosis of cancerous skin tissue and for temperature regulation studies of breast skin tissue for mamma cancer screening.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117210748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Continuing Search for One Photon State Selective Vibrational Chemistry 对单光子态选择性振动化学的持续探索
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.mb7
D. Lishan, G. Hammond, K. V. Reddy, J. E. Leonard
{"title":"The Continuing Search for One Photon State Selective Vibrational Chemistry","authors":"D. Lishan, G. Hammond, K. V. Reddy, J. E. Leonard","doi":"10.1364/pas.1981.mb7","DOIUrl":"https://doi.org/10.1364/pas.1981.mb7","url":null,"abstract":"A tantalizing goal, the unambiguous demonstration of state selective chemistry, is being actively pursued by several research groups.1 Bond selective chemistry has promise for the production of unique chemical species. First it must be shown that nonstatistical rates of reactions can be induced. Progress in this field has been moderately encouraging in that the systems studied are suggestive of small rate enhancements. The best case observed is the isomerization of allylisocyanide to allycyanide by Reddy and Berry.2 This unimolecular reaction was initiated with a single photon corresponding to the energy of a C-H overtone stretching vibration. The three different C-H bonds were excited with varying quanta and a direct correlation between the bond excited and the rate of isomerization was observed. When the isomerization rates are compared to the theoretical \"thermal\" expectations (RRKM) it is concluded that the overtone vibrational energy has not been throughly redistributed on the time scale for reaction.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128160935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Photoacoustic Measurement of Refractive Index Profile in Glass Waveguides 玻璃波导折射率分布的光声测量
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tha8
Ken Cheng, R. Swimm, Peter C. Yeung
{"title":"Photoacoustic Measurement of Refractive Index Profile in Glass Waveguides","authors":"Ken Cheng, R. Swimm, Peter C. Yeung","doi":"10.1364/pas.1981.tha8","DOIUrl":"https://doi.org/10.1364/pas.1981.tha8","url":null,"abstract":"Photoacoustic measurements provide a method of indirectly measuring the refractive index profile in glass waveguides. This technique therefore allows an independent verification of index profile measurements made using the conventional prism coupling method.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124366191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Photoacoustic Analysis of Particulate Carbon in the Atmosphere 大气中碳颗粒的光声分析
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tub25
W. McClenny, R. Röhl
{"title":"Photoacoustic Analysis of Particulate Carbon in the Atmosphere","authors":"W. McClenny, R. Röhl","doi":"10.1364/pas.1981.tub25","DOIUrl":"https://doi.org/10.1364/pas.1981.tub25","url":null,"abstract":"Photoacoustics offers a distinctive combination of features that recommends its use in analyzing the visible light absorption properties of particles collected on filters. The technique is nondestructive and responds only to absorbed light. Unloaded Teflon filters of the type used routinely by the USEPA in dichotomous samplers do not absorb visible light so that no pre-loading measurement is necessary. Previous studies of the photoacoustic (PA) response to soot loaded on Teflon filters have shown that: (1) at 100 Hz and 1000 Hz chopping frequencies the PA signal due to soot loading does not saturate even for loadings at which the sample is totally opaque, i.e., βℓ>31; (2) thermal wave interference effects are evident in the photoacoustic analysis of soot samples2; (3) the perturbation of the signal from soot, when typical ambient loadings of (NH4)2SO4 are admixed is considerably less (±10%) than the perturbation that occurs in light transmission measurements.3 Item (1) precludes the use of simplifying assumptions in relating PA response to the light absorption parameter βℓ. Item (2) explains item (1). Item (3) suggests that a calibration curve relating photoacoustic response and soot loading could be used to translate PA readings on ambient samples to elemental carbon content.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"33 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131922862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Some Observations on Signal Production in Photoacoustic Fourier Transform Infrared Spectroscopy 光声傅里叶变换红外光谱中信号产生的一些观察
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tua3
G. Kirkbright, D. Spillane
{"title":"Some Observations on Signal Production in Photoacoustic Fourier Transform Infrared Spectroscopy","authors":"G. Kirkbright, D. Spillane","doi":"10.1364/pas.1981.tua3","DOIUrl":"https://doi.org/10.1364/pas.1981.tua3","url":null,"abstract":"Recent investigations (1,2,3) have shown that the spectral range of Photoacoustic Spectroscopy (P.A.S.) can be extended to include the Mid Infrared (2.5-25 μm) by utilising Interferometry and Fourier Transform techniques to improve signal recovery. These techniques have compensated for the low intensity level of sources in this region which has made conventional, dispersive P.A.S. difficult to perform.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"139 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133871404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Photoacoustic Detection of Polarization-Dependent Nonlinear Optical Effects in Crystals 晶体中偏振相关非线性光学效应的光声检测
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.wa5
Y. Bae, J. Song, Y.B. Kim
{"title":"Photoacoustic Detection of Polarization-Dependent Nonlinear Optical Effects in Crystals","authors":"Y. Bae, J. Song, Y.B. Kim","doi":"10.1364/pas.1981.wa5","DOIUrl":"https://doi.org/10.1364/pas.1981.wa5","url":null,"abstract":"Using photoacoustic detection technique, we have investigated two-photon absorption (TPA) effects in oriented single crystals, ZnS (hexagonal), ZnO and SrTiO3, with particular attention to the dependence of TPA on the frequency and polarization of the incident laser beam.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125195327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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