Method and apparatus for mechanical dither stabilization of a la

Details Method and apparatus for mechanical dither stabilization of a la Method and apparatus for mechanical dither stabilization of a la

1986-05-16

1987-12-01

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964

Patent

active

047100273

ABSTRACT:
Three sets of laser angular sensors or masses, corresponding to three angularly disposed sensing planes, are mounted on a common instrument block. A compensating mass, which may be a fourth sensor, is also mounted on said instrument block. Said sensors or masses are supported for angular dithering about predetermined axes. The amplitudes, frequencies and phases of the dithering are adjusted, either by being actively directly driven or by passive mechanical coupling, to balance momenta and torque between said dithered masses. The ditherings of the masses of the sensors are of amplitude and frequency to avoid lock-in of said sensors. One, two, three or four dither mechanisms selectively may simultaneously be energized. The driving dither mechanisms may be switched from one mass to another or from one permutation and combination of masses to another. The switching may be a timed sequence, a random sequence, or a commanded sequence.

REFERENCES:
patent: 3373650 (1968-03-01), Killpatrick
patent: 3467472 (1969-09-01), Killpatrick
patent: 4179818 (1979-12-01), Craig
patent: 4277173 (1981-07-01), Ljung et al.
patent: 4425040 (1984-01-01), Ljung et al.
patent: 4445779 (1984-05-01), Johnson
patent: 4597667 (1986-07-01), Curby et al.

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