Light measuring apparatus

Details Light measuring apparatus Light measuring apparatus

1996-12-13

1998-06-02

Epps, Georgia Y.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356349, 356351, G01B 902

Patent

active

057609039

ABSTRACT:
Inputs output beams of a laser that have been oscillation-frequency modulated by an injection current control by a power source into a beam splitter through a lens and an isolator, detects beams reflected from a first half-mirror and passing through a path, beams reflected from a second half-mirror and passing through a path, and beams reflected from an object to be measured and passing through a path, with a photodetector, detects a beat frequency signal according to an optical interference of the above-described three types of reflected beams with a frequency detector, and calculates a distance to the object to be measured from the three beat frequencies with a signal processing unit. Can measure the distance in high precision by erasing a change rate of the oscillation frequency modulation and speed of light and by eliminating an influence of fluctuations, based on information of the three frequencies. Also, includes means using a lens for carrying out reflection and transmission on both sides of the lens instead of using the first and second mirrors and includes means using a polarization splitter and a 1/4 wave plate instead of using the beam splitter.

REFERENCES:
patent: 5341205 (1994-08-01), McLandrich et al.
patent: 5633712 (1997-05-01), Venkatesh et al.

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