Patent ID: 8354643
Filing Date: 2013-01-15
Classification: G01J

Abstract:
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.