Holographic scanner control based on monitored diffraction effic

Details Holographic scanner control based on monitored diffraction effic Holographic scanner control based on monitored diffraction effic

1984-02-13

1985-10-22

Corbin, John K.

Registers

Coded record sensors

Particular sensor structure

350 65, 350 68, 235454, 235457, G02B 532, G02B 2717

Patent

active

045484635

ABSTRACT:
Operating parameters for a multiple facet holographic disc scanner are adjusted on real time basis as a function of the actual diffraction efficiency of the facet region aligned with the impinging laser beam. The operating parameters are adjusted to achieve optimum signal levels independent of facet characteristics. Diffraction efficiency is inversely related to zero order beam power for a given level of input beam power. A photodetector measures the zero order beam power. The output of this photodetector is used to control video amplifier gain and/or semiconductor laser current.

REFERENCES:
patent: 4270131 (1981-05-01), Tompkins et al.
E. C. Broockman, "Holographic Scanning Disc with Auxiliary Data Track", IBM Technical Disclosure Bulletin, vol. 25, #3B, Aug. 1982, p. 1599.
E. C. Broockman, "Performance-Sensitive Gain-Adjustment Routine for Checkout Scanner", IBM Technical Disclosure Bulletin, vol. 24, #9, Feb. 1982, pp. 4844-4846.

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