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:
Jun. 23, 1992
Filed:
Nov. 26, 1990
Applicant:
Inventor:
Jerome M Welner, Manhattan Beach, CA (US);
Assignee:
Other;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
356416 ; 356419 ; 356225 ;
Abstract
Each of three or more telescopic filters in pairs of filters and detectors therefor has very narrow passband lines centered about laser wavelengths and nearby guardbands. As defined, a passband is any wavelength region of the spectrum permitted by a system to pass through to a detector, and a guardband is a spectral region near but not including the laser lines of interest. Each laser wavelength is simultaneously detected in exactly two detectors. Associated with each wavelength is a guardband near that wavelength, which is used to detect and reject broader band radiation. False alarms are made rare by proper parameter selection.