CAJ | 학술논문

为了检测LED激发海水浮游植物体内的叶绿素a所发出的痕量荧光信号，实现海水叶绿素a含量检测，预防赤潮等灾害，设计了基于STM32单片机和FPGA的数字锁相放大器。 FPGA实现系统正交矢量数字锁相放大和LED光源调制驱动信号DDS的产生；STM32单片机主要完成数据处理、温度补偿以及通信接口等功能。试验证明，该方案不仅能在自然环境下完成海水叶绿素a的实时检测，且具有较高的测量精度。基于该方案的原位海水叶绿素a传感器，具有结构简单便携、精度高、稳定性高和抗干扰能力强等特点，具有广阔的应用前景。
위료검측LED격발해수부유식물체내적협록소a소발출적흔량형광신호，실현해수협록소a함량검측，예방적조등재해，설계료기우STM32단편궤화FPGA적수자쇄상방대기。 FPGA실현계통정교시량수자쇄상방대화LED광원조제구동신호DDS적산생；STM32단편궤주요완성수거처리、온도보상이급통신접구등공능。시험증명，해방안불부능재자연배경하완성해수협록소a적실시검측，차구유교고적측량정도。기우해방안적원위해수협록소a전감기，구유결구간단편휴、정도고、은정성고화항간우능력강등특점，구유엄활적응용전경。
To detect the trace amount of fluorescence signals emitted from chlorophyll-a inside hytoplankton in seawater under LED excitation for implementing detection of chlorophyll-a in seawater, and protecting red tide and other disasters, the digital lock-in amplifier has been designed based on STM32 single chip computer and FPGA. The orthogonal vector lock-in amplifier and generation of the LED light source modulation driving signal DDS are realized by FPGA; while the functions of data processing, temperature compensation and communication are accomplished by STM32. The results of experiments indicate that design scheme can detect chlorophyll-a in seawater in real time under natural environment, and offer higher measurement accuracy. The in-situ seawater chlorophyll-a sensor based on this scheme features simple structure and easy to carry, high accuracy, high stability, and strong anti-interference capability, and possesses wide applicable prospects.