Distance measuring method and distance measuring apparatus

Details Distance measuring method and distance measuring apparatus Distance measuring method and distance measuring apparatus

1996-04-19

1998-12-08

Font, Frank G.

Optics: measuring and testing

By polarized light examination

With light attenuation

356376, 25055929, G01B 1124

Patent

active

058478337

ABSTRACT:
Two photodiodes are disposed side by side in the direction in which the slit light reflected from the object to be measured moves. One photodiode 1 of the two photodiodes receives the reflected slit light for a longer period than the other photodiode 2. When neither of the two photodiodes receive the slit light reflected from the object to be measured but both receive the same bias light, even if very weak noise light is incident from the outside or the characteristics of the photodiodes slightly differ, a higher light current flows through the photodiode 1 than through the photodiode 2, making the output of the clock-type comparator 7 stable in the initial state. This allows distance measurement to be always performed stably.

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