Electro-optic apparatus
AssigneeSmiths Industries Public Limited Company
InventorJeffrey Watson
Life of this patent
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Abstract
A radiation pyrometer has four rectangular photodiodes mounted in an orthogonal array. Radiation from a hot body is focussed as a circular image centrally of the array. The outputs of diagonally opposite photodiodes are connected together to form two identical output channels.
Claims10
In electro-optic apparatus of the kind including a detector and an imaging device that forms a radiation image on the detector, the improvement wherein the apparatus includes an array of at least two pairs of detectors, wherein the detectors of each pair are located diagonally opposite one another, and wherein the outputs of the detectors in each pair are connected together in respective ones of at least two channels such that no substantial change in the output of a channel is produced by a reduction in the area of radiation imaged on one detector and an equal increase in the area of radiation imaged on the other detector in the same pair.
Radiation pyrometer apparatus comprising:
- an orthogonal array of four radiation detectors each of which provides an electrical output in accordance with the radiation incident on the detector;
- an imaging device that forms an image of radiation from a radiation-emitting body substantially centrally of the array;
- and means connecting together the outputs of diagonally opposite ones of the detectors in two channels representative of the temperature of the radiation-emitting body such that no substantial change in the output of a channel is produce by displacement of the image causing a reduction in the area of radiation imaged on one detector and an equal increase in the area of radiation imaged on the other detector.
Dependencies are inferred from the claim text.