Calibration circuit for fiber optic proximity instrument

Details Calibration circuit for fiber optic proximity instrument Calibration circuit for fiber optic proximity instrument

1979-01-26

1981-03-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250227, G01J 132

Patent

active

042543312

ABSTRACT:
A fiber optic proximity measuring instrument for measuring dynamic changes in the gap between a probe tip and a target includes a light source, two sensors for measuring reflected light and lamp brightness, and a light conducting cable for transmitting light to the target and conducting light reflected from the target back to the reflected light sensor. The lamp intensity is set by a brightness control during setup to produce a mean level of reflected light intensity, and then is automatically regulated to maintain an equal mean intensity at the reflected light sensor despite changes in target reflectivity and cable light conductance.

REFERENCES:
patent: 3327584 (1967-06-01), Kissinger
patent: 3601613 (1971-08-01), Hock
patent: 3919546 (1975-11-01), Lutus
patent: 3931513 (1976-01-01), Germain
patent: 4009387 (1977-02-01), Nuver

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