Optics: measuring and testing – For light transmission or absorption
Patent
1982-11-23
1985-07-16
McGraw, Vincent P.
Optics: measuring and testing
For light transmission or absorption
356435, 374 45, G01N 2101, G01N 2139
Patent
active
045293198
ABSTRACT:
Both a method and an apparatus for the detection of thermo-optical signals are disclosed. There is involved a method related to photoacoustic spectroscopy (PAS) in which the heat waves, as a result of the absorption of an amplitude-modulated light beam, are not detected by an acoustic recorder, as in the case of photoacoustic spectroscopy, but rather optically. For this purpose, a second beam of light is conducted over the surface of the specimen and the influence exerted thereon by periodic variations in index of refraction which are dependent on temperature or pressure is measured. For the guiding of the measurement beam a so-called ATR plate known from ATR (attenuated total reflection) spectroscopy is used, it being placed as cover glass over the specimen. Within this plate the measurement light is guided in the vicinity of the critical angle for total reflection at the plate/specimen interface. Changes in index of refraction at the interface as a result of the absorption of the excitation light lead to a detectable modulation of the intensity of the measurement light.
REFERENCES:
patent: 3453434 (1969-07-01), Takami et al.
patent: 4011015 (1977-03-01), Baba
patent: 4299494 (1981-11-01), Badoz et al.
Carl-Zeiss-Stiftung
McGraw Vincent P.
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