The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 12, 1988
Filed:
Mar. 03, 1986
John H Tressler, III, Chagrin Falls, OH (US);
Honeywell Inc., Minneapolis, MN (US);
Abstract
A laser radiation detection system is disclosed comprising phase retarding apparatus for retarding a portion of the laser radiation incident on the system, optical focusing apparatus, detector apparatus and an electrical circuit. The optical focusing apparatus focuses the incident radiation on the detector apparatus. The detector apparatus is located in the focal plane and detects the presence of laser radiation due to the uneven distribution of light caused by the interference of the retarded portion of the incident radiation with the portion that remains in phase. The detector apparatus supplies output signals in response to the incident radiation received by each detector to the electrical circuit which then compares the various outputs from the detector apparatus in pairs and outputs a signal indicating the presence of laser radiation when the sum of the differences of the detector outputs is greater than a predetermined threshold value.