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数字地倾斜仪是“电信传输地震台网”中的前兆测量仪器,它可以模拟量记录和数字传输地壳的微小倾斜和固体潮汐。该仪器由双轴气泡传感器,拟模量放大器,模/数转换和数字传输电路等部分组成。本文主要讨论了微弱信号高稳定性模拟量放大器的结构和工作原理,并指出在现场试验中出现的问题和解决办法。该放大器的各环节功能——调制、放大、解调、滤波等全部采用运算放大器来完成,因此具有结构简单、体积小、漂移量小、线性度好、耗电省的特点,并有良好的抗扰性能。
Digital inclinometer is a precursor measurement instrument in “Telecommunication Transmission Seismograph Network”, which can record and digitally transmit tiny tilt of the earth’s crust and solid tide. The instrument consists of biaxial bubble sensor, analog amplifier, analog / digital conversion and digital transmission circuit and other components. This article mainly discusses the structure and working principle of the analog amplifier with high stability of weak signal and points out the problems and solutions in the field test. All functions of the amplifier - modulation, amplification, demodulation, filtering and so on are all done by the operational amplifier, so it has the advantages of simple structure, small volume, small drift, good linearity and power consumption, and has a good Anti-interference performance.