Detector and Optical System
First Claim
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1. A detector comprising first and second lenses for use with respective first and second sensing means;
- each lens comprising a plurality of Fresnel facets having respective fields of view adapted such that the fields of view of the first lens are alternately arranged with the fields of view of the second lens such that the fields of view of the first lens are adjacent to, but do not overlap with, the fields of view of the second lens in a single direction.
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Abstract
Embodiments of the present invention relate to a detector comprising first and second lenses for use with respective first and second sensing means; each lens comprising a plurality of Fresnel facets having respective fields of view adapted such that the fields of view of the first lens are alternately arranged with the fields of view of the second lens such that the fields of view of the first lens are adjacent only to, but do not over-lap with, the fields of view of the second lens in a single direction.
21 Citations
43 Claims
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1. A detector comprising first and second lenses for use with respective first and second sensing means;
- each lens comprising a plurality of Fresnel facets having respective fields of view adapted such that the fields of view of the first lens are alternately arranged with the fields of view of the second lens such that the fields of view of the first lens are adjacent to, but do not overlap with, the fields of view of the second lens in a single direction.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 32, 40)
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29. A detector substantially as described herein with reference to and/or as illustrated in the accompanying drawings.
- 30. An optical arrangement comprising a plurality of Fresnel lenses or Fresnel facets forming first and second sets of fields of view, wherein the first set of fields of view comprises a plurality of non-adjacent fields of view.
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33. A method of detecting masking of sensing means of a detector, comprising
detecting an event proximate the detector using the sensing means; providing a masking indicating output after a predetermined time period, unless within the predetermined time period the sensing means detects an event. - View Dependent Claims (34, 35, 36, 37, 39, 41, 42)
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38. A method substantially as described herein with reference to and/or as illustrated in the accompanying drawings.
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43. An optical arrangement or lens substantially as described herein with reference to and/or as illustrated in the accompanying drawings.
Specification