基于海流的海洋微小信号前端放大电路的研究

根据海流信号传感器的测量原理，提出了采集放大电路的技术方案。针对采集信号噪声大的特点，对海流电场微弱信号进行滤波提取，实现了对该信号同相分量的补偿式放大，在一定程度上克服了传感器在下沉时引起感生电场的强干扰，提高了电路测量精度。同时采用多级放大的原理，将微弱信号放大至仪器可观测的范围。通过Multisim仿真软件进行验证，结果表明，该采集放大电路满足设计要求，在保证信号质量的同时将信号放大至105~106倍。

Research on ocean tiny signal front-end amplifier circuit based on ocean current

According to the measurement principle of the ocean current signal sensor, the technical scheme of the acquisition amplifier circuit was proposed. Aiming at the characteristics of large noise of the collected signal, the weak signal of the ocean current electric field was filtered and extracted, realizing the compensation amplification of the in-phase component of the signal. To a certain extent, it overcame the strong interference of the induced electric field caused by the sensor when it sank, and improved the accuracy of circuit measurement. At the same time, the principle of multi-stage amplification was adopted to amplify the weak signal to the observable range of the instrument. It is verified by Multisim simulation software that the acquisition amplifier circuit meets the design requirements and amplifies the signal to 105~106 times while ensuring the quality of the signal.