Frequency shifter and optical displacement measuring apparatus u

Details Frequency shifter and optical displacement measuring apparatus u Frequency shifter and optical displacement measuring apparatus u

1996-02-26

1998-08-18

Hellner, Mark

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356356, 359326, G01P 0336, G02F 0135

Patent

active

057964700

ABSTRACT:
Disclosed is a frequency shifter for shifting a frequency of incident light beams. The frequency shifter has an electro-optic element for making incident the light beam whose frequency is to be shifted, an electrode unit disposed on the electro-optic element, an electric charge imparting circuit for imparting an electric charge to the electrode unit and a discharging circuit for discharging the electric charges accumulated in the electrode unit. Disclosed also is an apparatus, having the frequency shifter, for optically measuring relative displacement data to a measured object.

REFERENCES:
patent: Re35240 (1996-05-01), Heywood et al.
patent: 5347357 (1994-09-01), Nourrcier, Jr.
patent: 5483332 (1996-01-01), Takamiya et al.
patent: 5502466 (1996-03-01), Kato et al.
patent: 5629793 (1997-05-01), Takamiya et al.
patent: 5644422 (1997-07-01), Bortz et al.
R. Foord et al., "A solid-state electro-optic phase modulator for laser Doppler anemometry", J. Phys. D: Appl. Phys., vol. 7, L36-L39 (1974).
J.D. Zook, et al., "Temperture Dependence and Model of the Electro-Optic Effect in LiNbO.sub.3 ", Applied Physics Letters, vol. 11, No. 5, pp. 159-161 (1967).

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