海水营养盐微弱信号检测技术研究

doi:10.3976/j.issn.1002-4026.2019.06.002

Shandong Science ›› 2019, Vol. 32 ›› Issue (6): 9-14.doi: 10.3976/j.issn.1002-4026.2019.06.002

• Oceanographic Science, Technology and Equipment • Previous Articles Next Articles

Weak signal detection technology of seawater nutrient salt

LIU Jie, LIU Yan, CAO Xuan, MA Ran, ZHANG Shu-wei, GUO Cui-lian

Shandong Provincial Key Laboratory of Ocean Environmental Monitoring Technology，Institute of Oceanographic Instrumentation,
Qilu University of Technology (Shandong Academy of Sciences), Qingdao 266001,China

Received:2019-07-05 Online:2019-12-20 Published:2019-12-06

Abstract

Abstract: In this study, we investigated the weak signal detection technology of seawater nutrient salt based on the principle of photoelectric detection and phase-locked amplification technology. In hardware, the weak voltage signal of the photoelectric diode was preamplified to filter the noise using the analog phase-locked amplifier circuit. Based on the STM32F401 hardware platform, the improvement of the variable step size least mean square adaptive filtering algorithm was used in software to filter the noise. Then, the weak voltage signal of the seawater nutrients was accurately detected. Long-term simulation and experimental data denote that the weak signal detection scheme of the seawater nutrients proposed in this study is considerable significance to improve the data accuracy of the nutrient sensor.

Key words: nutrient salt, photoelectric detection, STM32F401, weak signal detection, analog phase-locked amplification, variable step size least mean square adaptive filtering algorithm

CLC Number:

TP391.8

LIU Jie, LIU Yan, CAO Xuan, MA Ran, ZHANG Shu-wei, GUO Cui-lian. Weak signal detection technology of seawater nutrient salt[J].Shandong Science, 2019, 32(6): 9-14.

References 10

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Weak signal detection technology of seawater nutrient salt

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