Linear absolute position sensor

Details Linear absolute position sensor Linear absolute position sensor

1993-11-15

1995-08-15

Evans, F. L.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250237G, 356373, 356375, G01D 5347, G01B 1100

Patent

active

054421667

ABSTRACT:
A position sensor includes a linear scale (14) that is translated along a translation axis of linear motion between at least two optical radiation source/receiver pairs (10/16 and 12/18). The optical transmissivity (or the optical reflectance) varies from a low value to high value going within a first region (14a) from a first end of the scale to a second end, and within a second region (14b) from a high value to a low value going from the first end to the second end. The outputs of the optical receivers (CH1, CH2) indicate a unique position along the linear scale, which is then correlated by a processor (26) with a unique position or displacement along the translation axis.

REFERENCES:
patent: 3639769 (1972-02-01), Clark
patent: 3708681 (1973-01-01), Ivers
patent: 4928008 (1990-05-01), Huggins et al.

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