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Second International Meeting on Photoacoustic Spectroscopy最新文献

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Highly Excited Vibrational States of Molecules by Photoacoustic Spectroscopy and the Local Mode Model 用光声光谱和局部模式模型研究分子的高激发振动态
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.mb6
H. Fang, R. Swofford
{"title":"Highly Excited Vibrational States of Molecules by Photoacoustic Spectroscopy and the Local Mode Model","authors":"H. Fang, R. Swofford","doi":"10.1364/pas.1981.mb6","DOIUrl":"https://doi.org/10.1364/pas.1981.mb6","url":null,"abstract":"Gas-phase intracavity cw dye laser photoacoustic spectroscopy has been used to characterize the highly excited overtones of X-H stretching vibrations (X = C, O, N) in molecules. We report here the overtone studies of homologous series of alkenes, alcohols, ketones, nitriles, ethers and amines measured with intracavity photoacoustic technique in the gas phase and supplemented by thermal lensing spectroscopy in the liquid phase.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"84 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":"122205110","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 Ammonium in Airborne Particulates Collected on Filter Membranes by Near Infrared Photoacoustic Spectroscopy 近红外光声光谱法测定过滤膜上空气微粒中的铵
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tub26
R. Röhl, R. Palmer
{"title":"Determination of Ammonium in Airborne Particulates Collected on Filter Membranes by Near Infrared Photoacoustic Spectroscopy","authors":"R. Röhl, R. Palmer","doi":"10.1364/pas.1981.tub26","DOIUrl":"https://doi.org/10.1364/pas.1981.tub26","url":null,"abstract":"Part of our research is aimed at exploring the potential usefulness of photoacoustic spectroscopy (PAS) for the nondestructive quantitative analysis of airborne particulates deposited on filter membranes. To date, most of this work has been concerned with the determination of the molecular species H2O and NH4+ in the fine fraction of aerosols collected by dichotomous virtual impactor samplers on Teflon filters.","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":"115328579","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
Image Formation by Integrated Scanning 综合扫描成像
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tub20
J. A. Burt
{"title":"Image Formation by Integrated Scanning","authors":"J. A. Burt","doi":"10.1364/pas.1981.tub20","DOIUrl":"https://doi.org/10.1364/pas.1981.tub20","url":null,"abstract":"In conventional optical instruments, imaging implies that all the rays passing through the lenses and reflecting from the mirrors of the instrument converge in the image plane in such a manner that a magnified duplicate of the object plane is formed. However, this correspondence between the object and the image need not always be present in an optical instrument, in which case we say the instrument is non-imaging. We do not consider such an instrument in this report. We do wish to discuss, however, a loosely-defined class of optical systems called scanning systems. This class includes systems with multiple transmitters and receivers, complicated scanner motions, synthetic apertures, etc. We direct our attention, however, only to systems where the object is time-sequentially scanned by a spatially localized beam. Furthermore, the entire instantaneous image, or intermediate image, produced by the scanning system is integrated according to some summation law. The integrated signal constitutes the intensity of the image point corresponding to the object point being scanned at that instant. When all integrated image points are displayed on a map according to their corresponding object positions we have the integrated scan image, and hence we call this system integrated scanning.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"215 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":"121292557","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
Characteristics of a Simple Spectrophone for Studying Iodine Vapor Absorption of Ar+ Laser Radiation 用于研究Ar+激光辐射碘蒸气吸收的简易声谱仪的特性
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tub6
D. H. Leslie, G. Trusty
{"title":"Characteristics of a Simple Spectrophone for Studying Iodine Vapor Absorption of Ar+ Laser Radiation","authors":"D. H. Leslie, G. Trusty","doi":"10.1364/pas.1981.tub6","DOIUrl":"https://doi.org/10.1364/pas.1981.tub6","url":null,"abstract":"We discuss the optoacoustic characteristics of a simple spectrophone used to study the absorption of Ar+ laser lines by Iodine vapor. Details of the resulting excited-state processes in molecular I2 and O2 are discussed in the following companion paper. Iodine vapor is a strong absorber of green and blue light, and the resulting fluorescent and disassociative radiation are well known from pre-laser studies (1,2). The excitation by laser radiation, however, has allowed detailed probing of the Iodine excited states (2). Use of the spectrophone has enabled examination of some non-radiative decay phenomena from those excited states.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"94 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":"116568396","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
Leaf Physiology and Anatomy by Photoacoustics 叶片的光声学生理学和解剖学
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tub28
G. Bults, B. Horwitz, S. Malkin, D. Cahen
{"title":"Leaf Physiology and Anatomy by Photoacoustics","authors":"G. Bults, B. Horwitz, S. Malkin, D. Cahen","doi":"10.1364/pas.1981.tub28","DOIUrl":"https://doi.org/10.1364/pas.1981.tub28","url":null,"abstract":"Plant leaves are generally composed of about seven to eight layers of cells: an upper epidermis layer, two to three layers of elongated palisade cells, about three layers of spongy cells with large intercellular air spaces and a lower spidermis. The epidermis layers contain pores (stomata) with a mechanism to open or close them, controlled by adjacent guard cells.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"120 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":"127285328","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 chemical reactions: H-D exchange in the system H2S - D2S 化学反应的光声分析:H2S - D2S体系中H-D的交换
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1007/978-3-663-06820-4_16
R. Kadibelban, P. Hess
{"title":"Photoacoustic analysis of chemical reactions: H-D exchange in the system H2S - D2S","authors":"R. Kadibelban, P. Hess","doi":"10.1007/978-3-663-06820-4_16","DOIUrl":"https://doi.org/10.1007/978-3-663-06820-4_16","url":null,"abstract":"","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":"125409979","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
Improvements of an acoustic window cell 声学窗单元的改进
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tub11
P. Helander
{"title":"Improvements of an acoustic window cell","authors":"P. Helander","doi":"10.1364/pas.1981.tub11","DOIUrl":"https://doi.org/10.1364/pas.1981.tub11","url":null,"abstract":"A new type of photoacoustic cell has been developed. It consists of a sapphire-window and a piezoelectric crystal mounted tightly together in a metal frame (Figure 1). The sapphire-window is sensing temperature variations in the sample due to absorption of pulsed radiation. The sapphire is then exhibiting a periodical length expansion which is measured with the piezoelectric crystal. The new cell is in some senses similar to the acoustically closed cell using a gas volume and a microphone to measure the variation in the sample temperature. It has for instance the same chopper frequency dependence. The methods for depth discrimination2 and for absolute determination of absorption coefficient suggested for the closed cell3-6 can therefore be applied to this new cell. The main difference to the usual cell is that this new cell is open and is well suited for measurements on liquids. Measurements on liquids have been done by Patel et al7 using a hydrophone. An open photoacoustic cell gives the experimentator additional freedom. The sample can be affected during the measurement for instance by addition of substances or by exposure to a controlled atmosphere. The cell can also be modified to allow the sample to flow through the cell which gives the possibility to make on line measurements in a system with flowing liquids. The new cell gives the additional freedom to measure from the bottom or from one side as well as from the top of a sample volume.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"22 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":"116970804","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
Opto/Acoustic Microscopy 光电元件/声学显微镜
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tha5
R. Bray, C. Quate, C. C. Williams
{"title":"Opto/Acoustic Microscopy","authors":"R. Bray, C. Quate, C. C. Williams","doi":"10.1364/pas.1981.tha5","DOIUrl":"https://doi.org/10.1364/pas.1981.tha5","url":null,"abstract":"In our work, we have been emphasizing the use of focused beams — both optical and acoustic — as a method for obtaining high resolution images. We work with acoustics in the microwave range and use our set-up for the acoustic microscope to receive the thermally generated signal. Mechanical scanning is used to form the raster pattern. With a cavity-dumped laser which provides us with 25 microsecond pulse at repetition rates of 1 MHz, we are able to record the image in a few seconds.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"100 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":"117329093","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
Absorption of Light by Pigments in Lichens Studied by Photoacoustic Spectroscopy 光声光谱法研究地衣中色素对光的吸收
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tub29
Ellen P. O'Hara, R. Tom, Thomas A. Moore
{"title":"Absorption of Light by Pigments in Lichens Studied by Photoacoustic Spectroscopy","authors":"Ellen P. O'Hara, R. Tom, Thomas A. Moore","doi":"10.1364/pas.1981.tub29","DOIUrl":"https://doi.org/10.1364/pas.1981.tub29","url":null,"abstract":"Spectroscopic studies of the absorption of light by pigments in lichen in situ have been hindered by the optical properties of the samples. Characteristic of many biological samples, the crustose lichen Acarospora schleicheri have a low reflectivity and high optical density. These properties make conventional transmittance spectroscopy and diffuse reflectance measurements difficult. Photoacoustic spectroscopy (PAS), however, is ideally suited for measuring the spectral characteristics of opaque and/or low reflecting samples.","PeriodicalId":202661,"journal":{"name":"Second International Meeting on Photoacoustic Spectroscopy","volume":"136 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":"133114236","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: 1
Absorption Measurement of Optical Fiber by Photoacoustic Method 光声法测量光纤的吸收
Second International Meeting on Photoacoustic Spectroscopy Pub Date : 1900-01-01 DOI: 10.1364/pas.1981.tub16
S. Huard, D. Chardon
{"title":"Absorption Measurement of Optical Fiber by Photoacoustic Method","authors":"S. Huard, D. Chardon","doi":"10.1364/pas.1981.tub16","DOIUrl":"https://doi.org/10.1364/pas.1981.tub16","url":null,"abstract":"Optical fibers are good materials for photo-acoustic investigation. First, their very low absorption limits optical measurements and second the Rayleigh diffused light, often greater than absorbed light, appears as a background. In optical communication range (0.8, 1-3 μm) it is well known that pure absorption is very low and even unmeasurable; nevertheless at other wavelengths such studies by photoacoustic methods are interesting to know the concentration of ions like OH-. On another point of view, if other optical ranges are considered (UV for example) absorption is not negligeable and must be known. But in this case the diffused Rayleigh light is very important (Power varies as λ−4).","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":"115320470","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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