Time-resolved infrared spectrophotometer

Details Time-resolved infrared spectrophotometer Time-resolved infrared spectrophotometer

1990-09-04

1991-06-04

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

356318, 356346, 2504581, G01J 345, G01J 3443

Patent

active

050216619

ABSTRACT:
A time-resolved infrared spectrophotometer capable of investigating samples exhibiting short periods of response to stimuli. The spectrophotometer comprises a rapid scan interferometer, a stimulus generator periodically producing a stimulus not in synchronism with the reference signal produced by the interferometer, a detector detecting the radiation emerging from the interferometer, a variable delay circuit producing a trigger signal after a delay with respect to the stimulus, a gate circuit converting the output from the detector into a discrete form in response to the trigger signal, a low-pass filter for detecting the envelope of the output from the gate circuit, an analog-to-digital converter converting the output from the filter into digital form, and a CPU which takes the Fourier transform of the output from the converter, for obtaining a spectrum.

REFERENCES:
patent: 3868185 (1975-02-01), Geenzel et al.
patent: 4054384 (1977-10-01), Hawes
patent: 4847878 (1989-07-01), Badeau
patent: 4925307 (1990-05-01), Cremers et al.

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