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该遥测仪用于实时监测呼吸率和心率。采用FM—FM制式,该仪包括发射机、接收机和处理器三部分。发射机的脉搏信号由光源和硅光电池组成的光敏传感器获得、呼吸信号由热敏电阻获得。信号经滤波、处理后,经副载波调制、将两信号叠加,再经射频调制而发射。处理器以80C35单片机为主机。按程序处理后,以数字形式显示呼吸率和心率。光敏传感器输出电流,经I/V电路变换成电压变化,文中给出了电路参数;为简化发射电路,呼吸信号直接加入副截波发生和调制电路。调制发射电路是改进了的三点式克拉特振荡电路。按本电路参数、发射频率为100MHz。接收部份的FM接收解调使用了TDA7000集成电路。分离后的信号经史密特触发器整形后转换成脉冲信号、驱动80C35单片机。从而按程序计算显示。
The telemeter is used to monitor respiratory rate and heart rate in real time. Using FM-FM standard, the instrument includes a transmitter, receiver and processor three parts. The transmitter’s pulse signal is derived from a photosensor consisting of a light source and a silicon photovoltaic cell, and the respiration signal is derived from the thermistor. The signal is filtered, processed, modulated by the subcarrier, the two signals are superimposed, and then transmitted by the RF modulation. Processor 80C35 microcontroller as the host. Processed according to the program to show the respiratory rate and heart rate in digital form. Photosensor output current, the I / V circuit into a voltage change, the paper gives the circuit parameters; to simplify the transmitter circuit, the respiratory signal directly into the secondary cutoff and modulation circuit. Modulation transmitter circuit is an improved three-point carat oscillation circuit. According to the circuit parameters, the transmitting frequency is 100MHz. The receive part of the FM receive demodulator uses the TDA7000 integrated circuit. After the separation of the signal by the Schmitt trigger plastic into pulse signal, drive 80C35 microcontroller. Thus calculated according to the program display.