OPTICAL MEASUREMENT DEVICES

摘要

The temperature of a material coupled to an optical fibre is obtained by measuring the transmission of light from an LED. Error due to variation of the wavelength of light emitted by the LED due to variation of its temperature, is compensated by measuring the associated variation of anode-cathode voltage across the LED. Data for correcting the measured value of the temperature of the material in accordance with the measured voltage is stored in a signal processor to provide a corrected signal on a display. The arrangement is also applicable to measurements employing the Pockels effect or the Faraday effect.