国产精品视频一区二区三区四,亚洲av美洲av综合av,99国内精品久久久久久久,欧美电影一区二区三区电影

When chopped light impinges on a solid in an enclosed cell, an acoustic signal  is  produced within the cell. This effect  is  the basis of a new spectroscopic technique for the study of solid and semisolid matter. A quantitative derivation is presented for the acoustic signal in a photoacoustic cell in terms of the optical. thermal, and geometric parameters  of  the system. The theory predicts the dependence of the signal on the absorption coefficient  of  the solid, thereby giving a theoretical foundation for the technique of photoacoustic spectroscopy. In particular, the theory accounts for the experimental observation that with this technique optical absorption spectra can be obtained for materials that are optically opaque.

提供商	北京東方德菲儀器有限公司	下載次數(shù)	93次
資料大小	1MB	資料類型	PDF 文件 免費下載該資料
資料圖片	--	瀏覽次數(shù)	766次