| 摘要 |
PURPOSE:To reduce power consumption by providing a displacing body which varies the relative position relation between a couple of facing bodies which face each other and a couple of light passing windows which do not face each other across the couple of facing bodies. CONSTITUTION:Oscillators 21 and 22 oscillates on the basis of voltages applied to the 1st and the 2nd terminals 7 and 8. For example, when a +5V DC constant voltage is applied to the 2nd terminal 8 and a +35V and a -25V voltage are applied to the 1st terminal 7 alternately at a 3-5Hz period, the oscillators 21 and 22 oscillate accurately in the opposite directions as shown by S and S'. The facing bodies 35 and 36 vary in relative position relation on the basis of the oscillations and the light passing parts 37 and 38 are placed in the state wherein they are nearly superposed on one another and opened and the state wherein they are not superposed on one another and closed alternately and repeatedly; for example, when an object of temperature measurement faces the 1st light passing window 5 and an infrared light temperature sensor faces the 2nd light passing window 6, infrared light from the body to be measured enters a storage body 2 through the 1st light passing window 5 and modulated periodically and intermittently by the facing bodies 35 and 36, and then the light exits from the storage body 24 through the 2nd passing window 6 and made incident on the sensor to measure the temperature precisely. |
