Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1975-04-29
1976-11-30
McGraw, Vincent P.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
250552, 250565, 356180, 356205, G01J 346
Patent
active
039945901
ABSTRACT:
A compact and portable colorimeter, including an integrally-formed probe having both a solid-state source of relatively monochromatic light and an optically coupled photodetector mounted therein. A power oscillator gating means is connected to the light source for pulsing same, to provide a chopped optical input. A demodulating circuit receives the output from the photodetector. The power oscillator gate signal is provided to a synchronous detector at the demodulating circuit, to synchronize detection with the chopping. The output from the demodulator is converted to a signal and read-out indicative of the concentration of that component of the sample which has absorbance characteristics correlated with the wavelength of the monochromatic source. The light source may comprise an LED, a laser diode or the like; and a tunable diode or array of LED's may also be used so as to enable a plurality of discrete frequency outputs, which outputs correlate with a plurality of chemical species the concentrations of which are to be determined.
REFERENCES:
patent: 2324304 (1943-07-01), Katzman
patent: 3263553 (1966-08-01), Baruch
patent: 3588253 (1971-06-01), Wittman
patent: 3727066 (1973-04-01), Louderback et al.
patent: 3807875 (1974-04-01), Fisher et al.
patent: 3831030 (1974-08-01), Wrobel et al.
patent: 3910701 (1975-10-01), Henderson et al.
Chopyak Stephen
Di Martini Raymond G.
McGraw Vincent P.
Popper Norman N.
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