Patent · US Expired

Differential radiation detection apparatus

US4442357A · kind A · utility

1Cited by

4References

9Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Geoffrey Baker · San Francisco, US
Roger A. Lockett · Southampton, GB

Key dates

Filing date	Sep 21, 1981
Grant date	Apr 10, 1984
Priority date	—
Expiry date	Sep 21, 2001

Classification

Technology area (CPC G)Physics
CPC primaryG01J5/0805
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

The indiction of temperature discontinuities in a scene can be used to indicate the boundaries of objects, for example the level of the contents of a storage silo. The thermal radiation from the object scene is imaged upon a pair of adjacent pyroelectric radiation detectors 9, 10. The scene radiation is chopped and the difference in detector outputs displayed to the observer while the field of view of the detectors, aligned with a visual aiming sight, is traversed across the object. The location and sign of a temperature discontinuity in the visual scene enables the observer to measure the silo contents.

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