Abstract
According to the invention, a PIR sensor system (100) comprises a first PIR sensor (1) associated with a first sensing region (11) and a second PIR sensor (2) associated with a second sensing region (12). The first and second sensing regions partially overlap and are divided into detection cells (46a- 46f) and (45a- 45d). Each detection cell is represented by predetermined characteristics of first and second output signals, which signals are based on input signals from first and second sensing elements (4-7) of each PIR sensor. Thereby different detection cells are encoded by a certain combination of signal characteristics (amplitude and sign) of the first and second output signals. Further, the PIR sensor system comprises a processing unit (15) configured to associate the characteristics of the first and second output signals with one of the detection cells for determining in which of the detection cells a heat source is positioned. The invention is advantageous in that production costs of the PIR sensor system are reduced. A calibration method for identifying the correspondence between the detection cells and the output signals at installation is also provided.
| Original language | English |
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| Patent number | WO2013128307 |
| IPC | H05B 37/ 02 A I |
| Priority date | 29/02/12 |
| Publication status | Published - 6 Sept 2013 |
| Externally published | Yes |