Light beam intensity controlling apparatus

Details Light beam intensity controlling apparatus Light beam intensity controlling apparatus

1984-06-11

1986-12-16

Wan, Gene

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

324 77K, G01J 132, G01R 2702

Patent

active

046298797

ABSTRACT:
Beam intensity controlling device includes an acoustooptic cell which receives an input light beam and produces an undiffracted or zero-order light beam and a diffracted beam in response to an RF signal at a predetermined frequency. An error signal is produced which is a function of the differences in the intensity of the zero-order beam from a desired level. This error signal is used to control the amplitude of the RF signal which in turn changes the intensity in the diffracted and zero-order beams such that the zero-order beam intensity is maintained relatively constant and can be provided as an input to a modulating device. The error signal has two components, a DC component which corrects for slow drift of the zero-order light beam intensity and an AC component which corrects for higher frequency changes in the zero-order light beam intensity.

REFERENCES:
patent: 3895317 (1975-07-01), Burton
patent: 4051329 (1977-09-01), Blondet et al.
patent: 4180822 (1979-12-01), Hudson et al.
patent: 4272825 (1981-06-01), Smithline et al.
patent: 4308544 (1981-12-01), Lucero et al.
patent: 4503388 (1985-03-01), Zehl et al.

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