| 摘要 |
PURPOSE:To accurately measure the temp. of relatively low temp. matter, by intermittently passing infrared rays by a chopper and taking out a signal component by the demodulator synchronized with the chopper and a low pass filter. CONSTITUTION:Intermittently changing infrared rays are incident on an infrared detector 11 by the action of a chopper 9. The output of the infrared detector 1 is inputted to the demodulator 13 synchronized with the chopper 9 to demodulate a signal component. Because disturbance light applied on the way of an infrared ray transmitting fiber 10 is not modulated by the chopper 9, said light is inversely modulated by the demodulator 13 and the disturbance component is distincted and only the signal component is left. This light component is converted to temp. by a data processor 5 consisting of an amplifier and a linearizer. |
