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Second International Meeting on Photoacoustic Spectroscopy最新文献

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Application of PAS on the Investigation of Human Skin PAS在人体皮肤研究中的应用
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.thb5
K. Kölmel, R. Niss, K. Giese
{"title":"Application of PAS on the Investigation of Human Skin","authors":"K. Kölmel, R. Niss, K. Giese","doi":"10.1364/pas.1981.thb5","DOIUrl":"https://doi.org/10.1364/pas.1981.thb5","url":null,"abstract":"Applications of photoacoustic spectroscopy (UV and visible spectral range) in the field of dermatological research are discussed. The spectral properties of the various layers of the skin are studied and examples are given for their modification under some pathological conditions and by topically applied pharmaceutics.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"27 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":"121343629","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
Practical Aspects of Chemical Studies of Powders by Photoacoustic Spectroscopy 光声光谱法在粉末化学研究中的应用
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.wa8
J. B. Kinney, R. Staley
{"title":"Practical Aspects of Chemical Studies of Powders by Photoacoustic Spectroscopy","authors":"J. B. Kinney, R. Staley","doi":"10.1364/pas.1981.wa8","DOIUrl":"https://doi.org/10.1364/pas.1981.wa8","url":null,"abstract":"Experience using photoacoustic spectroscopy to study chemical systems such as catalyst powders suggests a number of practical points to be considered in designing equipment and experiments. Cell design, gas atmosphere, temperature, pressure, and the sample are among the factors affecting the sensitivity and quality of spectra. Ultraviolet, visible, and near-infrared spectra have been obtained using a Princeton Applied Research Model 6001 Photoacoustic Spectrometer. For the mid-infrared region a Nicolet Model 7199 Fourier Transform Infrared Spectrometer has been used. Samples studied have included molecules adsorbed on platinum or silver supported on high surface area silica or alumina powders (or pellets), organic and organometallic molecules on silica and alumina powders, polymer foams, coals, oil shale, tissue samples, and others.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"26 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":"122067708","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 Spectroscopy of Powders 粉末的光声光谱
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.ma4
J. Monchalin, L. Bertrand, J. Parpal, J. Gagné
{"title":"Photoacoustic Spectroscopy of Powders","authors":"J. Monchalin, L. Bertrand, J. Parpal, J. Gagné","doi":"10.1364/pas.1981.ma4","DOIUrl":"https://doi.org/10.1364/pas.1981.ma4","url":null,"abstract":"Photoacoustic spectroscopy of powders, using microphone detection in the gas phase, has the avantage over conventional spectroscopic techniques to require no preparation and to leave the sample unaltered. When it is used with a Fourier Transform Interferometer, it promises to become a generally applicable powerful analytical technique. However, this technique appears still in its early stages of development, since there exists, to our knowledge, no theoritical description really applicable to the case of powders. The problem is certainly complexe, even more complexe than the one found in the competing technique of diffuse reflectance spectroscopy, since it is necessary to take in account the thermal, acoustical and optical (absorption and scattering) properties of the heterogenous medium constituting the powdered sample. We have derived a theoritical formulation applicable in this case and we are also conducting an experimental investigation with a low resolution infrared grating spectrometer.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"402 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":"123528302","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
Photo-acoustic Study of Zircon-based Ceramic Pigments and Glasses Containing High Concentrations of Copper and Cobalt 含高浓度铜和钴的锆基陶瓷颜料和玻璃的光声研究
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tha9
S. Parke, G.P. Warman, J. H. Mellor
{"title":"Photo-acoustic Study of Zircon-based Ceramic Pigments and Glasses Containing High Concentrations of Copper and Cobalt","authors":"S. Parke, G.P. Warman, J. H. Mellor","doi":"10.1364/pas.1981.tha9","DOIUrl":"https://doi.org/10.1364/pas.1981.tha9","url":null,"abstract":"Zircon stains for the ceramics industry have been produced commercially since 1949. At present the commercial stains are mainly zircon (ZrO2.SiO2) doped with vanadium, praseodymium or iron to produce blue, yellow or pink colours respectively. A research programme is in progress to study the factors controlling the colours of these zircon-based glaze stains and photo-acoustic spectroscopy has been used to monitor the colours of stains prepared by different routes. Spectra of coral pink tiles reveal a broad absorption between 600 nm and 350 nm which is yet to be identified. A blue glaze has a spectrum which suggests the presence of V4+ but the yellow glaze has a sharp cut-off near 470 nm which is quite uncharacteristic of the spectrum expected from Pr3+. Single crystal specimens of the doped zircon are being prepared and these too will be examined photo-acoustically. An attempt will also be made to obtain transmission measurements.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"32 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":"132082479","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
A Photoacoustic Study of the Photochemistry of ADSORBED Thioindigo Dyes 吸附硫代靛蓝染料光化学的光声研究
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.thb4
H. D. Breuer, H. Jacob, G. Düster
{"title":"A Photoacoustic Study of the Photochemistry of ADSORBED Thioindigo Dyes","authors":"H. D. Breuer, H. Jacob, G. Düster","doi":"10.1364/pas.1981.thb4","DOIUrl":"https://doi.org/10.1364/pas.1981.thb4","url":null,"abstract":"The photoisomerization of two indigoid dyes, thioindigo and 6,6′-diethoxythioindigo, adsorbed on alumina has been investigated.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"27 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":"128679329","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 Determination of Absorption Coefficients for Airborne Particulates Collected on Teflon Filters 聚四氟乙烯过滤器收集的空气微粒吸收系数的光声测定
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tub24
R. Palmer, R. Röhl
{"title":"Photoacoustic Determination of Absorption Coefficients for Airborne Particulates Collected on Teflon Filters","authors":"R. Palmer, R. Röhl","doi":"10.1364/pas.1981.tub24","DOIUrl":"https://doi.org/10.1364/pas.1981.tub24","url":null,"abstract":"In transmission spectroscopy, the absorptivity (or absorption coefficient) of a substance is defined as a = A/bc, where A is the absorbance, b the path-length of light through a sample, and c the concentration of absorbing material in the sample cell. The absorbance is defined by A = log Io/(Io-Ia) with Io representing the intensity of the unattenuated light beam and Ia the intensity of the absorbed light. In photoacoustic spectroscopy (PAS), Ia corresponds to the signal from a given sample, S, and Io to the signal from a black body reference with identical thermal properties, R. The PAS analog to absorbance, Apas, can therefore be written as in equation 1.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"31 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":"121398325","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 the Photoacoustic Effect for Obtaining Relative Efficiencies of Photothermal Converters 光声效应在获得光热转换器相对效率中的应用
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tub17
D. Cahen
{"title":"Application of the Photoacoustic Effect for Obtaining Relative Efficiencies of Photothermal Converters","authors":"D. Cahen","doi":"10.1364/pas.1981.tub17","DOIUrl":"https://doi.org/10.1364/pas.1981.tub17","url":null,"abstract":"The actual and practical efficiency of a photothermal converter is the ratio of the incident energy and the useful heat that can be extracted. It is determined mainly by the optical and thermal properties of the converter. Ideally, such efficiencies should be determined under conditions that are close to those under which the converter will be used in practice. For selective surfaces the ratio of integrated solar absorptance (α) and integrated emittance (ε) at a specified temperature is often used as a figure of merit. However this method often overestimates the importance of one of these properties1. Therefore calorimetric methods are sometimes preferred, but in many cases they do not lend themselves to use under close to \"practical\" conditions, and often put severe restrictions on sample size and shape2.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"208 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":"123678300","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
An Investigation of Polyester-Cotton Textiles using Photoacoustic Spectroscopy 涤棉织物的光声光谱研究
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tub19
S. Castleden, C. Ashworth
{"title":"An Investigation of Polyester-Cotton Textiles using Photoacoustic Spectroscopy","authors":"S. Castleden, C. Ashworth","doi":"10.1364/pas.1981.tub19","DOIUrl":"https://doi.org/10.1364/pas.1981.tub19","url":null,"abstract":"The conventional procedure used for the quantitative analysis of components in commercial textile products involves separation by dissolution of one of the individual components in a suitable solvent followed by a gravimetric determination. The British Standard method for the analysis of polyester-cotton mixtures involves the use of hot, concentrated sulphuric acid to dissolve the cotton component, allowing the mass of polyester to be determined (1). Other methods proposed for this determination include the use of sodium hydroxide (2) to dissolve the cotton and tetrachloroethane (3), 1,1,1,3,3,3-hexa-fluoropropan-2-ol (4), or ethanolamine (5) to dissolve the polyester. Although the precision and accuracy of these gravimetric procedures are advantageous the period of time necessary to perform each analysis is rather great and hazardous chemical reagents must be used.","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":"116637725","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
Perturbation of Photoacoustic and Transmission Measurements Due to the Mixing of Non-Absorbing, Scattering Particles with Particulate Carbon Collected on Teflon Filters 聚四氟乙烯过滤器上收集的非吸收散射颗粒与颗粒碳混合对光声和透射测量的扰动
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tub22
C. A. Bennett, R. Patty
{"title":"Perturbation of Photoacoustic and Transmission Measurements Due to the Mixing of Non-Absorbing, Scattering Particles with Particulate Carbon Collected on Teflon Filters","authors":"C. A. Bennett, R. Patty","doi":"10.1364/pas.1981.tub22","DOIUrl":"https://doi.org/10.1364/pas.1981.tub22","url":null,"abstract":"A widely used nondestructive technique for monitoring ambient levels of carbon in the atmosphere is the integrating plate method (IPM)(1) which takes advantage of the unique optical properties of elemental carbon (soot) by measuring the ambient by which a beam of light is attenuated when passing through a field loaded filter. Another absorptive technique is photoacoustic detection (PAD), a process which may be potentially more accurate than IPM for ambient measurements.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"220 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":"121543372","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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