Optics: measuring and testing – For light transmission or absorption – By comparison
Patent
1982-04-30
1984-10-02
Evans, F. L.
Optics: measuring and testing
For light transmission or absorption
By comparison
250343, 250351, 356 51, G01N 2159
Patent
active
044744714
ABSTRACT:
A correlation spectrometer permanently incorporates a reference cell (12) and an electro-optical phase modulator (EOPM) (50) in the light path between a sample cell (30) and a detector (20). The effect of the EOPM is such that its frequency modulates all of the monochromatic component of the incoherent radiation passing through it. The EOPM is adjusted so that when it is ON all of the energy in the monochromatic components is thrown into sidebands (55) differing from the original frequencies by integral multiples of the modulation frequency, with the total amount of energy absorbed from the original radiation remaining constant. When there is no coincidence between the constituents in the two cells, the detector's output is the same when the EOPM is ON and when it is OFF. However, when there is coincidence the detector's output changes when the EOPM is switched between its two states. The change in the detector's output is related to the quantity of the constituents in the sample cell.
REFERENCES:
patent: 3658422 (1972-04-01), Wilkinson
patent: 3694086 (1972-09-01), May
patent: 3723731 (1973-03-01), Blau, Jr.
patent: 3744918 (1973-07-01), Jacobson
patent: 3853407 (1974-12-01), Dewey, Jr.
patent: 4070111 (1977-01-01), Harrick
patent: 4094608 (1978-06-01), Young
patent: 4105919 (1978-08-01), Bridges et al.
patent: 4169678 (1979-10-01), Inoue et al.
Herget et al., Applied Optics, vol. 15, No. 5, May 1976, pp. 1222-1228.
Margolis Jack S.
Martonchik John V.
Evans F. L.
Jones Thomas H.
Manning John R.
McCaul Paul F.
The United States of America as represented by the Administrator
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