Pyroelectric infrared temperature compensated detector
AssigneeKureha Kaqaka Koqyo Kabushiki Kaisha
InventorsYasushi Endou, Hisao Takahashi, Tetsuaki Kon
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Abstract
A pyroelectric infrared detector or infrared ray receiving element comprising a plurality of pyroelectric operating areas, utilizing one of the operating areas as an infrared radiation detection area having a light-transmissive surface electrode. The electrical signal produced in the signal detection area is compensated by an electrical signal produced in another pyroelectric operating area having a light-reflective surface electrode. Temperature drift and noise due to vibration are drastically reduced through the compensation.
Claims12
A pyroelectric infrared radiation detector comprising:
- a housing;
- a pyroelectric film element disposed in the housing;
- a window in said housing permitting infrared radiation to fall on a surface of the film element;
- the film element being divided into an infrared radiation detection area and a temperature compensation area;
- the film element in said infrared radiation detection area having a light-transmissive electrically conductive film electrode defining a first electrode disposed on the surface of the film element exposed to incident infrared radiation and the film element in the compensation area having a light-reflective electrically conductive electrode defining a second electrode disposed on the surface of the film element exposed to incident infrared radiation;
- and
- a third electrode being disposed on another surface of the pyroelectric film element on which the infrared radiation is not incident;
- each of said first and second electrodes being disposed on the surface of the film in each of four equal quarters of the film element around the center of the film element.
A pyroelectric infrared radiation detector comprising:
- a housing;
- a pyroelectric film element disposed in the housing;
- a window in said housing located to permit infrared radiation to fall on a first surface of the film element;
- a light-transmissive electrically conductive film electrode disposed on the first surface of the film element;
- a light-reflective electrically conductive electrode disposed on the first surface of the film element;
- and
- a third electrode being disposed opposite the light-transmissive and the light reflective electrodes on a surface of the pyroelectric film element opposite the first surface.
Dependencies are inferred from the claim text.