| Summary: | 碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 94 === The study aims to develop an infrared temperature-sensing system by applying to thermal radiation theory. The system consists of an optic unit, a photodetector, and an electronic unit. This system detects thermal radiation at 1310 nm wavelength, the temperature range of the system is 600~4000℃, rise time 2μs, spatial resolution 400μm. The calibration was performed in the temperature low at 1200℃ by using a K-type thermocouple that can gain between temperature and output voltage relations, but beyond the temperature 1200℃ applying to Planck’s law as calculate to predict. In the calibrated temperature range, the measurement error is ±80℃ for the low temperatures and ±20℃ for the high temperatures. The system was used to measure temperature variation during Nd:YAG pulse laser welding process. Experiments ware performed with stainless steel plates as specimen radiation by a laser pulse of 7ms duration time and various energy in the rang of 1245~5313mJ. The experimental results show the feasibility of the infrared temperature-sensing system in application of Nd:YAG pulse laser welding process.
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