Design And Implementation Of Control Circuit For Laser Raman Spectroscopy System Based On Seafloor Observation Network

With technological development and social progress, the researches of ocean aregetting deeper, which also has put higher requirements on the ocean detectiontechnologies. Comparing with traditional technologies, Seafloor observatory networkhas several advantages such as real-time, long-term. Through cables set up inadvance, observatory network will make scientific equipment scattered in somefield integrated into complete network. This could bring about the real-time collectionand analysis to the scientific data. Consequently, that will greatly promote thedevelopment of deep-sea scientific research.Raman spectroscopy system based on Seafloor observatory network is a nodeequipment of the whole network. By analyzing the spectral data obtained in field,people could monitor the subsea chemical environment (eg SO2-4ion concentration).The entire system including shore-based control section and underwater detectionsection (including a control cabin and two spectral measurement cabin),measurement and control circuits mentioned in this article belongs to underwaterdetection part.The purpose of design is to ensure long-term sustainable operation ofsystem. In the actual design, this article will refer to electrical codes of observatorynetwork and operational requirements of deep-sea Raman spectral detection system,and then manage to archive the monitoring and control circuit of Ramanspectroscopy.The hardware part of the circuit, including the related circuit designand debugging, using PROTEL software environment; Software part includes thepreparation of single-chip system control program (based on the C language), thedevelopment environment is IAR Embeded Workbench.Control circuit can be divided into three parts according to the functions, they aremicroprocessor control system, power protection part and internal communicationnetwork(different from the main communication cable of sea-floor observatorynetwork). power protection part is made of a series of DC/DC power modules and dedicated protection modules, this part is responsible for protecting the various powerelectronic device, it could respond and inhibit various electrical anomalies. In termsof MSP430microcontroller module, it is mainly responsible for controlling theunderlying hardware in underwater system, including the collection of a variety ofenvironment or electrical sensors, controlling system relay switch according tooperating requirements. The purpose of internal network is to make thecommunication among three underwater cabin (a control cabin and two lasermeasuring compartment). Based on the actual hardware and software basis, thisarticle determines the application layer communications protocol and definesassociated controller device address, function rules and registers map standards.Software part of the circuit includes the work of controller programming,Raman spectroscopy detection system includes two kinds of controllers, one isMSP430microcontroller, the other is PC104. This article focuses on the preparationof MSP430MCU control procedures, including Modbus-based RS-485communication functions implemented in software, as well as with a variety of sensorchip (SHT11, GY-80, etc.) communication implementation.Finally, the whole integrated test forward hardware and software parts has beencompleted. Shore-based control program is used to test cabin PC104spectralacquisition function, obtaining spectral data; MSP430MCU is tested to controlQE65000spectrometers and other equipment such as PC104, collect some of theenvironmental parameters (temperature, humidity and attitude). Test result showsthat the basic hardware and software monitoring circuit basically meet the controlsystem requirements.