基于海流的海洋微小信号前端放大电路的研究
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摘要
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。
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.
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.
引文
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[17]石杰,张效民,侯铁双,等.航船噪声引起的低频海洋环境噪声级发展趋势[J].鱼雷技术,2010,18(2):112-116.
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[2]刘宁,李永军,朱光文.一种投弃式快速海流剖面观测仪器[J].海洋技术,2007,26(3):13-15.
[3]卢效东.日本海洋卫星技术、海洋仪器新进展[J].海洋信息,2003(1):28-29.
[4]宋大雷,周相建,陈朝晖,等.海流计发展现状与发展趋势展望[J].船海工程,2017,46(1):93-100.
[5]张正惕,杨世伦,谷国传.我国海洋测流仪器的发展与现状[J].海洋技术,1999,18(2):17-21.
[6]陈文义,张瑞,张宁,等.投弃式海流剖面仪探头流场数值模拟[J].科技导报,2010,28(20):62-65.
[7]刘宁,张瑞,陈文义,等. XCP投弃式海洋探头阻力系数数值计算及试验研究[J].海洋技术,2010,29(4):12-14.
[8]刘宁,何鸿鲲.投弃式海流剖面测量仪测量原理研究[J].海洋技术,2010,29(1):8-11.
[9]殷铸灵.低频小信号放大电路的研究[D].北京:北京邮电大学,2012.
[10]刘懿.生物信号放大电路的设计[D].南京:东南大学,2016.
[11]贾志成,史正妍,程敏,等. XCP系统中微弱信号采集放大电路的设计与实现[J].测控技术,2013,32(4):30-34.
[12]ZHANG Q S,ZHAO X,ZHANG X Y,et al. Influence of expendable current profiler probe on induced electric field of ocean currents[J]. Mathematical Problems in Engineering,2016,2016:1-9.
[13]LIU S H,ZHANG X Y,ZHAO X,et al. Study of an expendable current profiler detection method[J]. Ocean Engineering,2017,132:40-44. https://doi. org/10. 1016/j. oceaneng. 2017. 01. 018.
[14]LIU S H,ZHANG Q S,ZHAO X,et al. Expendable current profiler for measuring the electric field induced by ocean currents[J]. Measurement and Control-London-Institute of Measurement and Control,2017,50(3):62-69.
[15]LI S H,ZHANG Q S,ZHAO X,et al. Dynamic data transmission technology designed for expendable current profiler[J]. IEEE Journal of Oceanic Engineering,2018,43(1):66-71.
[16]张启升,邓明,刘宁,等.投弃式海流电场剖面仪研制[J].地球物理学报,2013,56(11):3699-3707.
[17]石杰,张效民,侯铁双,等.航船噪声引起的低频海洋环境噪声级发展趋势[J].鱼雷技术,2010,18(2):112-116.
[18]McDONALD M A,HILDEBRAND J A,WIGGINS S M. Increases in deep ocean ambient noise in the northeast pacific west of san nicolas island california[J]. Journal of Acoustic Society of America,2006,120(2):711-718.
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