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Second International Meeting on Photoacoustic Spectroscopy最新文献

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Laser Photoacoustic Spectroscopy of High Vibrational Overtones 高振动泛音的激光光声光谱
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.mb5
J. S. Wong, C. Moore
{"title":"Laser Photoacoustic Spectroscopy of High Vibrational Overtones","authors":"J. S. Wong, C. Moore","doi":"10.1364/pas.1981.mb5","DOIUrl":"https://doi.org/10.1364/pas.1981.mb5","url":null,"abstract":"The nature of intramolecular energy transfer and mode coupling in highly vibrationally excited, polyatomic molecules can be studied by high overtone spectroscopy [1,2]. The details of the vibrational overtone spectrum corresponding to changes in vibrational quantum number of 5, 6, and 7 directly probe the vibrationally excited, final state. Since the absorption cross sections for these transitions are very small, typically less than one barn, photoacoustic spectroscopy can be used to detect these overtone absorptions.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"137 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":"115812733","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 Chopping Frequency Studies on Uncoated Sapphire and Zinc Selenide 无涂层蓝宝石和硒化锌的光声斩波频率研究
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tub15
N. Fernelius
{"title":"Photoacoustic Chopping Frequency Studies on Uncoated Sapphire and Zinc Selenide","authors":"N. Fernelius","doi":"10.1364/pas.1981.tub15","DOIUrl":"https://doi.org/10.1364/pas.1981.tub15","url":null,"abstract":"Photoacoustic chopping frequency studies similar to those reported elsewhere1-4 have been performed on uncoated CVD ZnSe samples at 10.6 μm and on uncoated sapphire, A12O3, samples at 1.3 μm.","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":"124451461","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
Application of Photoacoustic Spectroscopy to Combustion Diagnostics 光声光谱在燃烧诊断中的应用
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.mb10
K. Tennal, G. Salamo, R. Gupta
{"title":"Application of Photoacoustic Spectroscopy to Combustion Diagnostics","authors":"K. Tennal, G. Salamo, R. Gupta","doi":"10.1364/pas.1981.mb10","DOIUrl":"https://doi.org/10.1364/pas.1981.mb10","url":null,"abstract":"In this paper we report on a new application of photoacoustic spectroscopy: Minority species concentration measurements inside a combustion region. As a proof of principle, we have applied the photoacoustic technique to the measurement of NO2 concentration in a flat-flame burner. Because of the sensitivity of this technique, it has the potential of developing into a very powerful combustion diagnostic tool.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"57 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":"116179097","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 Measurements of Thermal Diffusivity. Description of the "Drum Effect" 热扩散系数的光声测量。“鼓效应”的描述
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1063/1.329966
P. Charpentier, F. Lepoutre, L. Bertrand
{"title":"Photoacoustic Measurements of Thermal Diffusivity. Description of the \"Drum Effect\"","authors":"P. Charpentier, F. Lepoutre, L. Bertrand","doi":"10.1063/1.329966","DOIUrl":"https://doi.org/10.1063/1.329966","url":null,"abstract":"For a thermally thick sample (thickness ℓs, thermal conductivity ks, specific heat Cs) the R-G theory /1/ gives pressure variations δp1 detected on the front surface of a sample (fig 1a)depending on the modulation frequency f as fig 2 shows for the modulus |δP1|.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"144 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":"131685995","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: 174
Photoacoustic Determination of Total Carbon Deposits 总碳沉积的光声测定
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tub23
J. Pleil, G. Russwurm, W. McClenny
{"title":"Photoacoustic Determination of Total Carbon Deposits","authors":"J. Pleil, G. Russwurm, W. McClenny","doi":"10.1364/pas.1981.tub23","DOIUrl":"https://doi.org/10.1364/pas.1981.tub23","url":null,"abstract":"Carbonaceous particles, a major constituent of submicron atmospheric aerosols, have been related to visibility degradation and adverse health effects. Various efforts based on thermal combustion, optical transmittance, nuclear excitation, solid phase photoacoustics and wet chemistry have been made to develop analytical methods to determine elemental and organic carbon, and total carbon values.(1) The technique described here is applied only to total carbon measurements and utilizes a three step process consisting of: 1) carbon combustion to CO2, 2) cold trap preconcentration and 3) gas phase photoacoustic detection. The primary design criteria for this system are simplicity and low cost rather than high precision and low detection limit.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"13 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":"132808029","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 Overtone Spectroscopy 光声泛音光谱
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.mb4
K. V. Reddy, Michael J. Berry
{"title":"Photoacoustic Overtone Spectroscopy","authors":"K. V. Reddy, Michael J. Berry","doi":"10.1364/pas.1981.mb4","DOIUrl":"https://doi.org/10.1364/pas.1981.mb4","url":null,"abstract":"The introduction of intracavity dye-laser photoacoustic detection inaugurated the, hitherto unexplored, area of gas-phase vibrational overtone molecular spectroscopy.1–3 We have used this technique to detect extremely weak overtone absorptions in more than 50 molecular systems in the spectral region 1000–400 nm. The molecular systems studied are: benzenes, halomethanes, propenes, and nitriles. Here, we present a summary of our recent work describing the photoacoustic techniques used to record the spectra, reduce the background window noise, optimize intracavity power, and measure absorption cross-sections. Also the characteristics of overtone transitions are reported.","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":"133855447","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 photoacoustic effect at phase-transitions: its dependence on the thermal thickness of the sample 相变时的光声效应:它与样品热厚度的关系
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.wa7
P. Korpiun, R. Tilgner
{"title":"The photoacoustic effect at phase-transitions: its dependence on the thermal thickness of the sample","authors":"P. Korpiun, R. Tilgner","doi":"10.1364/pas.1981.wa7","DOIUrl":"https://doi.org/10.1364/pas.1981.wa7","url":null,"abstract":"The thermal properties that are the essential determinants of the PA-signal from a solid or a liquid are the density, the thermal conductivity and the specific heat. At a first-order phase-transition, the latent heat strongly influences the signal. It has been found experimentally that the amplitude runs through a minimum; the phase-angle as a function of temperature shows different patterns /1,2/.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"45 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":"122037690","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
Investigation of Thermal Contact by the Photoacoustic Effect 利用光声效应研究热接触
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tua12
J. Parpal, J. Monchalin, L. Bertrand, J. Gagné
{"title":"Investigation of Thermal Contact by the Photoacoustic Effect","authors":"J. Parpal, J. Monchalin, L. Bertrand, J. Gagné","doi":"10.1364/pas.1981.tua12","DOIUrl":"https://doi.org/10.1364/pas.1981.tua12","url":null,"abstract":"We are studying the application of the photoacoustic effect to the measurement of small concentrations of aerosols deposited on a surface. Our investigation has been essentially focused on the detection of asbestos (chrysotile) fibers collected on a membrane filter. Detection is made possible by a sharp absorption band of the mineral at 2.7 μm and is improved by fiber alignment. The smallness of the fiber diameters with respect to the wavelength insures that the heat source generated by infrared absorption, is proportional to the mass of collected dust. However, the proportionality between the observed photoacoustic signal and the mass may be affected by the dependence of heat transfer to the subtrate upon deposition conditions. This effect is rather difficult to investigate with a low concentration of collected dust and a cell of minimum volume required for convenient detection: when the frequency of modulation is varied, interfering effects, such as another weak absorption or heat diffusion to the cell walls, are likely to complicate the interpretation. Therefore, we have used a very different set-up which is described below. We have also oriented our investigation towards the general study of the effect on the photoacoustic signal of an imperfect thermal contact between a thermally thin sample and its substrate. Results obviously can be applied to the understanding of the detection of collected aerosols, but also to other problems such as non-destructive adherence testing.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"9 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":"128281427","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 Shock Waves and Sound Velocities in Metal Vapors 金属蒸气中的光声激波和声速
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.mb1
A. Tam, K. Chiang, W. Imaino
{"title":"Photoacoustic Shock Waves and Sound Velocities in Metal Vapors","authors":"A. Tam, K. Chiang, W. Imaino","doi":"10.1364/pas.1981.mb1","DOIUrl":"https://doi.org/10.1364/pas.1981.mb1","url":null,"abstract":"Most photoacoustic experiments are concerned with the generation and detection of small amplitude sound waves after optical absorption. In this paper, we study the opposite case: generation and detection of large amplitude shock waves by a pulsed laser. The generation is achieved by taking advantage of the efficient ionization of metal vapors by resonant1 or quasi-resonant2,3 laser beams. In general, photoacoustic generation can be due to various causes; for example: collisional deexcitation resulting in thermal expansion, photodissociation, gas evolution, photoionization and optical breakdown, and so on. For the present case of optical breakdown in a vapor, the photoacoustic generation efficiency can be especially high, because ionization causes an increase in the total particle density, and also the electrons produced usually have large kinetic energies. Hence, large-amplitude shock waves can be generated by laser-induced breakdown.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"24 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":"121945569","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 Surface and Bulk Absorptions in a Standing Wave 驻波中表面和体吸收的光声检测
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tua13
L. Bertrand, J. Monchalin
{"title":"Photoacoustic Detection of Surface and Bulk Absorptions in a Standing Wave","authors":"L. Bertrand, J. Monchalin","doi":"10.1364/pas.1981.tua13","DOIUrl":"https://doi.org/10.1364/pas.1981.tua13","url":null,"abstract":"High power lasers require optical components with extremely low bulk and surface absorptions. A method which allows to determine separately these two contributions for a transmitting window is necessary if one wants to improve the material preparation and the polishing technique. When the surface is coated it is also important to be able to measure the intrinsic absorption of the coating material and the absorption occuring at the interfaces.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"11 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":"128299829","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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