Optical distance measuring system using a position sensitive dev

Details Optical distance measuring system using a position sensitive dev Optical distance measuring system using a position sensitive dev

1990-08-06

1991-10-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

356 1, G01J 120

Patent

active

050556649

ABSTRACT:
An optical displacement measuring system including a PSD, position sensitive device, and having a pair of outputs providing electrical current I1 and I2 satisfying the equation ##EQU1## where x is the position of a spot of light along a surface of the PSD reflected by a target from a light source which in turn gives the target distance by triangulation. A ramp generator U1A periodically generates an increasing ramp voltage periodically energizing the light source LED1 to pulse the light source between on and off states. A comparator U10 compares the Sum I1+I2 against a given threshold as the sum I1+I2 increases with increasing ramp voltage. Subtraction circuitry, U7 and U8B, samples I1 and samples I2 when the sum I1+I2 reaches the given threshold, and outputs the difference I1-I2 to provide a measure of x.

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Position-Sensitive Detectors, Hamamatsu Catalog, Apr. 1985.

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