Radiant energy – Photocells; circuits and apparatus – Combined with diverse-type device
Patent
1991-08-20
1992-09-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Combined with diverse-type device
25022711, 356432, H01J 4014
Patent
active
051515903
ABSTRACT:
A photoacoustic cell, including a light guide having a fiber portion consisting of a bundle of a number of optical fibers and a covering portion by which the side surface of the fiber portion is covered, the covering portion of the light guide extending beyond the fiber portion in a manner that when a first end of the light guide is brought into contact with the surface of a material to be measured, a closed space is defined by the end surface of the fiber portion, by the inner wall of the covering portion, and by the surface of the material to be measured; a pipe having a first end that is open in the closed space and a second end that penetrates through the covering portion and is open toward the outside of the covering portion; and a microphone that is coupled to the second end of the pipe, and a photoacoustic measuring device including this photoacoustic cell.
REFERENCES:
patent: 4184768 (1980-01-01), Murphy et al.
patent: 4533252 (1985-08-01), Cahen
patent: 4860224 (1989-08-01), Cashell et al.
patent: 5083869 (1992-01-01), Nakata et al.
Conception and Realization of a Photoacoustic detector for in Situ Spectroscopy, P. Poulet; J. Cambron, Journal of Photoacoustics, 1, 329-346 (1983).
Evaluation of drug penetration into skin by photoacoustic measurment, K. Kolmel; B. Sennhenn; K. Glese, J. Soe. Sosmet. Chem., (Sep./Oct.) 1986, 37, 375-385.
Matsuoka Masahiro
Nanba Ryujiro
Sawada Tsuguo
Takamoto Ryuichi
Allen Stephone
Nelms David C.
Shiseido Company Ltd.
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