用于微波消解仪的荧光光纤测温系统的研制

设计了一种用于微波消解仪的光纤荧光测温系统.系统使用蓝色发光二极管作为激励光源，传感器在由发光二极管发出的一系列光脉冲的激励下，产生周期性的荧光衰落信号.这个信号经探测后，首先经过一个低噪声宽带放大器，然后再由系统对每一衰落曲线数字化.数字化后的采样值经校正了所有的偏置之后，由PC机处理.PC机将采用线性最小二乘曲线拟合技术，生成对这些数据的最佳指数拟合曲线，通过最佳拟合曲线求得指数衰落的时间常数.随后再将时间常数与预先存储的数据对照表做比较，以确定传感器的温度.

Study of fluorescence optical fiber temperature measuring system for microwave digestion instrument

A fluorescence optical fiber temperature measuring system, which can be applied to microwave digestion instrument, has been developed. The blue LED is adopted as the excitation light source in this system. The sensor generates periodic fluorescence decay signal under the excitation of a series of light pulse from LED. After having been detected, the signal is firstly amplified by a low noise wide band amplifier. Then every decay curve is digitized. The least squares curve fitting method is used to obtain the best exponential fitting curve with these data. Finally, through comparing the time constant with the pre-stored data sheet, the temperature of the sensor can be determined.