Light frequency change detecting method and apparatus

Details Light frequency change detecting method and apparatus Light frequency change detecting method and apparatus

1983-04-19

1986-02-11

Buczinski, S. C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356346, 356349, 343 9PS, G01P 336

Patent

active

045695881

ABSTRACT:
A method and apparatus for detecting a frequency change of a light modulates the scattered light from the object of measurement using an acousto-optic modulator or the like, heterodyne-detects the scattered light after modulation to provide an electrical signal having a frequency (f.sub.d -f.sub.m) which is the difference between the Doppler frequency f.sub.d and the modulation frequency f.sub.m, passes this electrical signal to a filter while changing the modulation frequency f.sub.m, and obtains the modulation frequency f.sub.m at which the signal voltage is the largest or the smallest, that is, the Doppler frequency f.sub.d.

REFERENCES:
patent: 3984190 (1976-10-01), Barrett et al.

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