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:
Sep. 15, 2015
Filed:
Nov. 20, 2007
Applicants:
Timothy Andrew James, Middlesex, GB;
Dave John Randall, Wootton Bassett, GB;
Inventors:
Timothy Andrew James, Middlesex, GB;
Dave John Randall, Wootton Bassett, GB;
Assignee:
Thorn Security Limited, Middlesex, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01J 5/00 (2006.01); G01J 5/06 (2006.01); G01J 5/34 (2006.01); G01J 1/02 (2006.01);
U.S. Cl.
CPC ...
G01J 5/0014 (2013.01); G01J 5/0018 (2013.01); G01J 5/061 (2013.01); G01J 5/34 (2013.01); G01J 1/0252 (2013.01); G01J 2005/063 (2013.01); G01J 2005/068 (2013.01);
Abstract
A detector comprises a housing (), a pyroelectric array sensor () mounted within the housing, a heater () associated with the pyroelectric array sensor, and control means () for varying the power supplied to the heater to control the temperature of the pyroelectric array sensor relative to the ambient temperature in order to minimise the rate of change of temperature of the pyroelectric array sensor and to keep a predetermined difference between the temperature of the pyroelectric array sensor and the ambient temperature.