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用钽酸锂热释电探测器实现的火焰温度实时测量系统 ,主要由光学接收系统、信号放大与处理系统及显示系统三部分组成。其中 ,光学接收系统主要包括光学接收镜头、调制盘、截止滤光片、窄带干涉滤光片、聚焦透镜及光电转换系统等 ;信号放大与处理系统主要包括前置放大电路、选频放大电路、采样保持电路、模数转换电路及 80 3 1单片机等 ;显示系统主要包括数字显示器、打印机及接口电路等。介绍了该系统的工作原理与基本结构 ,讨论了其中的技术难点及相应的解决方法 ,分析了各量的测量精度对温度测量精度的影响。
The real-time measuring system of flame temperature realized by lithium tantalate pyroelectric detector is mainly composed of optical receiving system, signal amplifying and processing system and display system. The optical receiving system mainly includes an optical receiving lens, a modulation disk, a cut-off filter, a narrow band interference filter, a focusing lens and a photoelectric conversion system. The signal amplification and processing system mainly includes a preamplifier circuit, a frequency selective amplifier circuit, Sample and hold circuits, analog-digital conversion circuits and 80 3 1 single-chip, etc .; display systems include digital displays, printers and interface circuits. The working principle and basic structure of the system are introduced. The technical difficulties and the corresponding solutions are discussed. The influence of the measurement accuracy on the temperature measurement accuracy is analyzed.