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:
Apr. 17, 1990
Filed:
Mar. 04, 1988
British Aerospace Public Limited Company, Bristol, GB;
Abstract
It is known to use liquid crystal cells for thermal imaging. However, the sensitivity of the liquid crystal cell is reduced due to the walls of the cell absorbing some of the incident radiation and locally heating the crystal thereby producing localized changes in phase. Liquid crystal materials which have sufficient surface tension to form a film without forming a part of a cell are disclosed where the pitch of the helix of the film exhibits a strong temperature dependence. In one embodiment the liquid crystal film is mounted wtihin a Fabry-Perot resonant cavity so that detection of the change in the crystal due to a change in temperature is enhanced.
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