Spectrometer of the electro-opto-acoustic type with capacitor-ty

Details Spectrometer of the electro-opto-acoustic type with capacitor-ty Spectrometer of the electro-opto-acoustic type with capacitor-ty

1976-10-14

1978-06-13

McGraw, Vincent P.

Optics: measuring and testing

Range or remote distance finding

With photodetection

73 24, 324 61R, 356201, 356204, 356205, 361280, G01J 342, G01N 2106, G01R 2726

Patent

active

040946088

ABSTRACT:
A spectrometer generally of the electro-opto-acoustic type, using a capacitor type detection instead of acoustic detection. A holder with a sample carrier having a dielectric and with a conducting backing plate on one surface of the sample carrier and a transparent conducting coating and an electrical potential on the opposite surface, with the potential applied after sample accumulation. A source for directing a beam of radiation onto the sample for cyclically heating the sample and varying the spacing between the metal backing plate and conducting coating, and an ac detector circuit connected to the backing plate providing an ac signal varying with the spacing and hence with the composition of the sample.

REFERENCES:
patent: 2870338 (1959-01-01), Gillson, Jr.
patent: 3493484 (1970-02-01), Berg et al.

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