Infrared motion sensor
First Claim
1. An infrared motion sensor comprising:
- a multi element infra red (IR) detector having an outer surface and at least one pair of detector elements comprising a first detector element of a first polarity and a second detector element of a second, opposite polarity located on the outer surface;
at least one first optical element associated with the first detector element and configured to focus IR radiation from a predetermined first monitored volume onto the first detector element;
at least one second optical element associated with the second detector element and configured to focus IR radiation from a predetermined second monitored volume onto the second detector element; and
a partition between the first and second detector elements, the partition being of a material which is at least substantially opaque to IR radiation and at least substantially transparent to visible/near IR(NIR) radiation, the partition being configured to at least substantially block all IR radiation from passing from the first optical element to the second detector element and from the second optical element to the first detector element.
1 Assignment
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Accused Products
Abstract
An infrared motion sensor has a multi element IR detector with first and second separate arrays of optical elements associated with respective first and second detector elements and a partition of a material substantially opaque to IR radiation and substantially transparent to visible/NIR light arranged to separate the IR optical paths from the first and second optical elements to the respective first and second detector elements. In this way, the detector elements function individually with respect to IR radiation and individual optical elements produce separate and independently oriented fields of view on the first and second sides of the sensor, while visible/NIR light still falls on both detector elements so that detector element signals resulting from NIR radiation roughly cancel one another.
18 Citations
19 Claims
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1. An infrared motion sensor comprising:
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a multi element infra red (IR) detector having an outer surface and at least one pair of detector elements comprising a first detector element of a first polarity and a second detector element of a second, opposite polarity located on the outer surface; at least one first optical element associated with the first detector element and configured to focus IR radiation from a predetermined first monitored volume onto the first detector element; at least one second optical element associated with the second detector element and configured to focus IR radiation from a predetermined second monitored volume onto the second detector element; and a partition between the first and second detector elements, the partition being of a material which is at least substantially opaque to IR radiation and at least substantially transparent to visible/near IR(NIR) radiation, the partition being configured to at least substantially block all IR radiation from passing from the first optical element to the second detector element and from the second optical element to the first detector element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An infrared motion sensor, comprising:
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at least one multi element infra red (IR) detector having at least one pair of detector elements comprising a first IR detector element of a first polarity and a second IR detector element of a second polarity; a first array of first optical elements each having a predetermined field of view and a predetermined field of view direction in a horizontal plane, each first optical element being configured to direct radiation received from its respective predetermined field of view onto the first detector element; a second array of second optical elements each having a predetermined field of view and a predetermined field of view direction in a horizontal plane, each second optical element being configured to direct radiation received from its respective predetermined field of view onto the second detector element; and a partition of a material at least substantially opaque to IR radiation and at least substantially transparent to visible/near-IR (NIR) radiation located between the first detector element and second detector element and configured to at least substantially block IR radiation from any first optical element from reaching the second detector element and to at least substantially block IR radiation from any second optical element from reaching the first detector element. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification