Test device for an optical infra red detector

Details Test device for an optical infra red detector Test device for an optical infra red detector

G - Physics

08

B

340/77

G08B 29/00 (2006.01) G08B 17/107 (2006.01) G08B 29/14 (2006.01)

Patent

CA 1226637

TEST DEVICE FOR AN OPTICAL INFRA RED DETECTOR ABSTRACT A test device for a multiple channel infra red detector utilizing photocells comprising an aperture plate mounted on the housing member of the detector. In the embodiment described a test lamp is mounted on a surface portion of the aperture plate in fixed relationship with two openings in the plate which are concentrically disposed about the two photocells. The system utilizes the characteristic of the dual channel detector that the ratio of the response of each of the two cells to emissions in the infra red range (as received from a fire) is a certain value. The opening associated with one of the cells is larger in the path between the lamp and that cell so that more light energy impinges on it. The electrical energy to the lamp is increased until a level is reached where the ratio of the response of the one cell to the response of the other cell simulates the responses of the two when monitoring a fire. The warning system is triggered. A numerical value can be determined which is indicative of the sensitivity of the detector and which is repeatable.

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