| 摘要 |
<p>A first thermopile sensor (1) with an angle of view of 22° and a second thermopile sensor (2) with an angle of view of 44° are positioned with a gap in the horizontal direction of 20cm or less therebetween. A first threshold of output voltages of the thermopile sensors (1, 2) for assessing whether a person is present is set at 650mV, and a second threshold of an output voltage difference of the thermopile sensors (1, 2) for determining a stationary person is set at 50mV. A sensing process is carried out with a sensing unit (3) on the basis of the output voltages of the thermopile sensors (1, 2), the first threshold, and the second threshold, and stationary persons, operating persons, and heat sources other than persons are sensed. Thus, not only is the presence of a heat source sensed, but a stationary person and heat sources other than persons are sensed and distinguished, from the location of the heat source, the difference in output between the first and second thermopile sensors (1, 2), and the difference in output of the second thermopile sensor (2) over a given temporal axis.</p> |
