Very wide-angle viewing accessory for infrared detector
AssigneeCentre Scientifique Et Technique Du Batiment (Cstb)
InventorsChristophe Martinsons, Pierre Lepretre
Life of this patent
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Abstract
An optical device designed to be arranged on a detector provided with an infrared sensor for increasing the angle of the field of view of the detector. The device includes a primary mirror and a secondary mirror that face each other. The primary mirror collects the infrared radiation from a wide-angle field of view to return it to the secondary mirror, which in turn reflects it back to the sensor of the infrared detector.
Claims10
An optical device, intended to be arranged on a detector equipped with an infrared sensor in order to increase an angle of the field of view of the detector, comprising:
- a primary mirror of circular overall shape, comprising a circular opening at its center,
- a secondary mirror of circular overall shape and of diameter smaller than the diameter of the primary mirror, comprising a circular opening at its center,
- at least one connecting means for connecting the primary mirror and the secondary mirror, so as to arrange a reflective surface of the primary mirror facing a reflective surface of the secondary mirror,
- the primary and secondary mirrors being designed to reflect radiation in the infrared;
- and
- the primary mirror and the secondary mirror being configured to form an afocal system and to form a continuous very wide-angle image with the center of the image obtained by the central circular openings, the angle (α) of the field of view of the device being greater than 90°.
Dependencies are inferred from the claim text.