为了对煤矿、油田、大坝、桥梁等领域进行安全压力监测，设计了一种单线圈振弦传感器信号分析仪。该系统包括激振电路、拾振电路以及等精度测频部分，激振电路由单片机产生扫频脉冲信号，通过由HCPL3120芯片构成的驱动隔离电路对振弦传感器进行激振。拾振电路将传感器输出的微弱正弦信号放大、整形成方波信号，并由单片机读入进行等精度频率测量。最终，本设计实现了对单线圈型振弦传感器的激振，验证了各级电路的输出波形，完成了传感器输出频率的测量，能够更为准确的对煤矿、油田、大坝、桥梁等领域进行安全压力监测，具有很好的工程推广价值。
A single coil vibrating string sensor
signal analyzer system is designed in order to monitor safety pressure of coal
mine, oil mines, dams, bridges and other fields in this paper. The system
includes excitation circuit, pick-up circuit and frequency measurement part
with equal precision. The excitation circuit generates sweep pulse signal by
single chip microcomputer. Vibration string sensor is excited by driving
isolation circuit composed of HCPL3120 chip. The pick-up circuit enlarges the
weak sinusoidal signal output by the sensor to form a square wave signal, then
reads it into the single chip microcomputer for equal precision frequency
measurement. Finally, this system realizes the excitation of the single-coil
vibrating wire sensor, verifies the output waveform of the circuits at all
levels and completed the measurement of sensor output frequency which have
great project promotion value monitoring the safety pressure of coal mines, oil
fields, dams, bridges and other fields more accurately.
