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:
Jul. 06, 1999
Filed:
Apr. 03, 1997
Donald F Weirauch, Dallas, TX (US);
Raytheon Company, Lexington, MA (US);
Abstract
This is a mercury cadmium telluride flame detector which can be operated at room temperature, and a method for making such a detector. It utilizes at least two different compositions of mercury cadmium telluride on a common substrate; and has at least two contact areas on at least one of said mercury cadmium telluride compositions. In one embodiment, the substrate 104 is transparent and an upper mercury cadmium telluride layer 88 is over an insulating layer 89, which insulating layer is over a lower mercury cadmium telluride layer 90 and the lower mercury cadmium telluride is on said substrate, and contact areas 86 are provided on said upper mercury cadmium telluride layer 88, whereby the lower layer 90 filters radiation prior to the radiation reaching the upper layer 88. Preferably the insulating layer is cadmium telluride, the contact areas 86 are mercury telluride, and said upper layer, said insulating layer and said lower layer are epitaxial layers. In another embodiment, the substrate is transparent and different compositions of mercury cadmium telluride are fabricated on a deposition template by liquid phase epitaxial growth where the composition varies with time during said growth of the film and a top portion of said film is lapped at an angle to provide a first lapped surface and a bottom portion of said film and said deposition template are lapped away to provide a second lapped surface substantially parallel to said first lapped surface, and said lapped film is adhered to the substrate and said lapped film is etched to provide said different compositions of mercury cadmium telluride spaced from one another.