Infrared moisture measurement device and infrared moisture measurement method

摘要

A first infrared ray emitting diode (LED) which emits infrared rays of measurement light whose absorption of infrared rays changes by the moisture content of the object to be measured; a second infrared ray sensor which emits infrared rays of a reference light whose infrared absorption is hardly changed by the moisture content of the object to be measured; An infrared moisture measuring device having an LED is disclosed. An optical system for irradiating the object to be measured with the infrared light of the measurement light and the reference light emitted by the first and second infrared LEDs and condensing the reflected infrared light from the object to be measured; And an InGaAs light receiving element for outputting a light receiving signal corresponding to the light amount of the infrared ray. The moisture value of the object to be measured is obtained based on the light receiving signal output from the InGaAs light receiving element.