Multiple control frequency phase modulator in phase modulated in

Details Multiple control frequency phase modulator in phase modulated in Multiple control frequency phase modulator in phase modulated in

1994-02-01

1995-10-17

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356358, G01B 902

Patent

active

054595711

ABSTRACT:
A phase-modulated interferometer has improved control and signal processing. Superimposition signals capable of evaluation in a phase-modulated interferometer without a complicated sawtooth control of the phase modulator are attained, in that two sinusoidal control signals which have modulation frequencies (.omega..sub.1, .omega..sub.2) and are rigidly coupled with respect to phase and frequency are applied to the known phase modulator and a cosine signal which is used in a conventional manner for evaluating the phase displacement is filtered of the superimposition signal generated in the interferometer by an electronic bandpass filter. At the filter frequency (.omega..sub.F) of the bandpass filter, an odd-number harmonic and an even-number harmonic of the two modulation frequencies (.omega..sub.1, .omega..sub.2) have the same frequency, when the amplitudes (.phi..sub.1, .phi..sub.2) of the control signals satisfy the condition for the suitable operating point of the phase modulator. The improvement has application to phase-modulated interferometers, in particular, for precision distance measuring devices, preferably by the heterodyne evaluating method.

REFERENCES:
patent: 4422764 (1983-12-01), Eastman
patent: 5141315 (1992-08-01), Malvern
patent: 5212825 (1993-05-01), Layton
patent: 5216532 (1993-06-01), Taylor
patent: 5319438 (1994-06-01), Kiasaleh

Affiliated with

Also associated with

Rating

Multiple control frequency phase modulator in phase modulated in does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multiple control frequency phase modulator in phase modulated in, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiple control frequency phase modulator in phase modulated in will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-601880