Optical linear encoder with light quantity calabration

Details Optical linear encoder with light quantity calabration Optical linear encoder with light quantity calabration

1990-08-28

1991-11-19

Turner, Samuel

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356374, 250237G, G01B 902

Patent

active

050661299

ABSTRACT:
In an averaged diffraction moire position detector of the present invention, diffracted lights which have passed through the same places as those through which measuring diffracted lights have passed are used for monitoring a quantity of light. Therefore, change in the quantity of light of a light source and change in the transmittance of diffraction gratings can be suitably corrected.

REFERENCES:
patent: 4767925 (1988-08-01), Kawamoto
patent: 4836681 (1989-06-01), Van Sauers et al.
patent: 4979827 (1990-12-01), Matsui

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