Method for calorimetric absorption spectroscopy and device for w

Details Method for calorimetric absorption spectroscopy and device for w Method for calorimetric absorption spectroscopy and device for w

1981-06-22

1984-02-07

Rosenberger, R. A.

Optics: measuring and testing

For light transmission or absorption

250341, 356 731, 374 32, G01N 2100

Patent

active

044299990

ABSTRACT:
A method of calorimetric absorption spectroscopy (CAS) is claimed, wherein a sample, irradiated with a measuring-light pulse of a specified power, duration, and wavelength and whose absorbance at the specific wavelength of the measuring light is determined as a result of the heating of the sample which occurs as a result of the absorption of a portion of the measuring light, is cooled to a temperature which is so low that the specific heat of the sample during measurement is only a small fraction of the value at normal temperature. This produces an increase in sensitivity by a factor of more than 10.sup.5. The manner in which the lifetime of radiant and nonradiant recombination can be determined in a simple fashion is claimed for samples which have a first impurity center, capable of recombination both by radiation and without radiation, and a second center, capable of recombination only without radiation. The temperature sensor in the sample chamber is placed in a cryostat suitable for working the method, and shielded hermetically against the measuring light and the scattered light resulting from the latter.

REFERENCES:
patent: 4041313 (1977-08-01), Potter et al.
patent: 4185497 (1980-01-01), Decker et al.
Cohen et al., "Loss Measurements in Optical Fibers, 2: Bolometric Measuring Instrumentation" Applied Optics, vol. 13, No. 11 (Nov. 1974), pp. 2522-2524.

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