Optical analysis method and apparatus having programmable rapid

Details Optical analysis method and apparatus having programmable rapid Optical analysis method and apparatus having programmable rapid

1986-04-28

1989-11-28

Evans, F. L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250343, 350358, 350372, 356308, 356326, G01J 342, G01N 2135

Patent

active

048839639

ABSTRACT:
The optical reflectance or transmittance concentration analyzer includes an acousto-optical tunable filter (AOTF). The AOTF is tuned by a computer controlled digital-to-analog converter through a tunable sweep oscillator. Tuned beams can be selected according to their direction of propagation or according to their polarization behavior. Therefore, if desired, a pair of crossed polarizers can be used to select one of the tuned monochomatic light beams that pass from a light source through the AOTF. To obtain rapid wavelength change along with electronic chopping or wavelength modulation, the digital-to-analog converter output is combined with the output of a high speed signal generator. The modulated light is conducted directly or through a fiber optic cable to the location of the optical measurement and impinges upon the sample where it is reflected or transmitted. The emerging light is collected onto detector(s). The measurement time interval can be distributed among the required wavelengths or wavelength pairs according to an unequal scheme to decrease the error of the result in a calibration equation. The apparatus is particularly adaptable for use as an on-line concentration monitor in industrial process control because of its stability, efficiency and ability to perform quick analyses.

REFERENCES:
patent: 3520614 (1970-07-01), Goldstein
patent: 3679288 (1972-07-01), Harris
patent: 3828173 (1974-08-01), Knepler
patent: 3861788 (1975-01-01), Webster
patent: 3944334 (1976-03-01), Yano et al.
patent: 3944335 (1976-03-01), Saito et al.
patent: 3953107 (1976-04-01), Yano et al.
patent: 4052121 (1977-10-01), Chang
patent: 4082464 (1978-04-01), Johnson
patent: 4236076 (1980-11-01), Judge et al.
patent: 4264205 (1981-04-01), Landa
patent: 4285596 (1981-08-01), Landa
patent: 4286327 (1981-09-01), Rosenthal et al.
patent: 4342502 (1982-08-01), Chang
patent: 4404642 (1983-09-01), Rosenthal
patent: 4540282 (1985-09-01), Landa et al.
patent: 4602342 (1986-07-01), Gottlieb et al.
patent: 4663961 (1987-05-01), Nelson et al.
Harris et al., "Acousto--Optic Tunable Filter", Journal of the Optical Society of America, vol. 59, No. 6, (Jun. 1969), pp. 744-747.
Chang, "Non Collinear Acousto--Optic Filter with Large Angular A perfume", Applied Physics Letters, vol. 25, No. 7, (10/1977), pp. 370-372.
Wetzel, "Near--Infrared Reflectance Analysis", Analytical Chemistry, vol. 55, No. 12, (10/1983), pp. 1165A-1171A.
Jacob et al., "Development of an AOTF Spectrometer", SPIE, vol. 22, pp. 40-46.

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