Method for measuring a physical quantity providing digital data

Details Method for measuring a physical quantity providing digital data Method for measuring a physical quantity providing digital data

1986-12-23

1989-03-14

Rosenberger, Richard A.

Optics: measuring and testing

By configuration comparison

With photosensitive film or plate

356238, 356429, G01B 1104

Patent

active

048120430

ABSTRACT:
A measuring method and apparatus wherein the value of a physical quantity is measured by means of a first measuring device (2, 3) producing at its output an electrical voltage or current, which is a function of the value of the said physical quantity; wherein, simultaneously, a reference value for this physical quantity is measured by means of a second measuring device (2, 4), which is identical to the said first measuring device; wherein the output voltage or current of the said first measuring device (3) is applied to one of the measuring inputs (10, 11) of an analog/digital converter (9) with a variable threshold value; wherein the output voltage or current of the said second measuring device (4) is applied to the other measuring input (11, 10) of this analog/digital converter (9) and wherein the digital output signal of the said analog/digital converter (9) is applied to a processing and/or data display device (14).

REFERENCES:
patent: 2510347 (1950-06-01), Perkins
patent: 2641960 (1953-06-01), Strother
patent: 2699701 (1955-01-01), Strother et al.
patent: 3582661 (1971-06-01), Pijls
patent: 3586445 (1971-06-01), Martin, Jr.
patent: 4247764 (1981-01-01), Kissinger
patent: 4498781 (1985-02-01), Kaplit
patent: 4513439 (1985-04-01), Gorgone et al.

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