Patent · US Expired

Power meter with background subtraction

US5376783A · kind A · utility

16Cited by

9References

33Claims

0Family size

Assignee

OPHIR OPTRONICS LTD. · IL

Inventors

Jacob Vecht · Jerusalem, IL
Ben-Zion Halperin · Ramat Gan, IL
Ephraim Greenfield · Jerusalem, IL

Key dates

Filing date	Apr 24, 1994
Grant date	Dec 27, 1994
Priority date	—
Expiry date	Apr 24, 2014

Classification

Technology area (CPC G)Physics
CPC primaryG01J1/44
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A technique for performing background suppression in photodiode detectors is disclosed. A first detector measures the light emitted by the source to be measured and the background light, while a second detector simultaneously measures the background light only. The value measured by the second detector is subtracted from the value measured by the first detector, and the difference represents the portion of the first detector's measured value which is attributable to the source to be measured.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.