INFRARED RADIOMETRY USING SILVER-HALIDE FIBERS AND A COOLED PHOTONIC DETECTOR

A fiber optic radiometer based on a cooled photonic detector was desig ned and constructed. The radiometer Is capable of measuring in real ti me the temperature of tissue irradiated with a CO2 laser. A silver hal ide IR fiber is used to deliver the CO2 laser radiation to the target and also to deliver the thermal radiation emitted from the target back to the detector. Two methods of measurements were examined, both of w hich solve the problem of detector blinding by reflected CO2 radiation . A theory of operation for this silver halide fiber optic radiometer, based on lock-in amplifier techniques, is presented. A short discussi on of the radiometer design and construction is given. This work forms a basis for the subject of measuring, in real time, fast radiometric signals caused by CO2 laser irradiation. Such a radiometer is very use ful when dealing with pulsed photo thermal radiation with 10.6-mu m CO 2 laser radiation. This technique is very useful in medicine and indus try.