Heterodyne measurement device and method

Details Heterodyne measurement device and method Heterodyne measurement device and method

1995-04-25

1998-01-20

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 51, 342118, G01C 308, G01S 1308

Patent

active

057106215

ABSTRACT:
A heterodyne measurement system and method for determining a distance between a reference point and an object using a continuous measurement beam, a continuous reference beam, an intensity modulated measurement beam, and an intensity modulated reference beam. The continuous measurement beam and the intensity modulated measurement beam are directed from the reference point toward the object to produce a reflected continuous measurement beam and a reflected intensity modulated measurement beam, respectively. The reflected continuous measurement beam and the continuous reference beam are combined to produce a first beat signal and the reflected intensity modulated measurement beam and the intensity modulated reference beam are combined to produce a second beat signal. The first beat signal is integrated to produce a first integration value and the second beat signal is integrated to produce a second integration value. The distance between the reference point and the object is determined in accordance with the first and second integration values.

REFERENCES:
patent: 3713154 (1973-01-01), Kummer
patent: 3719942 (1973-03-01), Herman et al.
patent: 4743110 (1988-05-01), Arnaud et al.
patent: 4834531 (1989-05-01), Ward
patent: 4846571 (1989-07-01), Jelalian et al.

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