Detector and optical system
First Claim
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1. A detector comprising first and second lenses and respective first and second sensing means;
- each lens comprising a plurality of Fresnel facets having respective fields of view, the facets of the first and second lenses having complementary masking 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, the detector further comprising a reduction range or blocking detection apparatus comprising means, responsive to at least a first input signal from at least one of the sensing means, to generate a blocking detection signal after a first period of time unless a second input signal is received within the first period of time from at least one of the sensing means.
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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 overlap with, the fields of view of the second lense in a single direction.
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15 Claims
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1. A detector comprising first and second lenses and respective first and second sensing means;
- each lens comprising a plurality of Fresnel facets having respective fields of view, the facets of the first and second lenses having complementary masking 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, the detector further comprising a reduction range or blocking detection apparatus comprising means, responsive to at least a first input signal from at least one of the sensing means, to generate a blocking detection signal after a first period of time unless a second input signal is received within the first period of time from at least one of the sensing means.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
Specification