The Research Of Low-power Consumption And Self-recording Mechanical Ocean Current Meter

China is abundant in marine resource, which provides a strong guarantee to the economic sustainable development. In order to effectively exploit marine resource and protect the marine environment, in the meanwhile prevent the ocean environment from pollution, we must monitor, investigate and study different kinds of parameters of oceanographic data, thus reliable and stable oceanographic instruments are becoming necessity.Ocean current is a basic sea data and also an indispensable major parameter in ocean observation and investigation.The real-time monitor and measurement for oceanic flows are important parts to oceanographic research, ocean current meter is the most common used equipment in those researches.With the rapid development of semiconductor technology and electronic information technology, ocean current measurement equipments are progressing quickly, though a batch of ocean current meters based on acoustic Doppler effect and acoustic transit time method are emerging, mechanical rotor current meters are still widely used due to its low cost, for example,RCM-4S,SLC9-2 direct reading type current meter.This article studies the widely used SLC9-2 direct-reading type ocean current meter and aim at solving its problems of high power consumption and short continuous working hours.In order to achieve the goal of reducing the power consumption, the underwater detector of this project has been optimized from chip select, device working mode and software optimization three aspects,e.g. we choose the low power consumption chip STM32F103VE as CPU. During the non-data acquisition time, we set the CPU in low power consumption mode and meantime close all the data acquisition modules. The software optimizes flow rate, flow measurement, depth, temperature measurement and data storage. This device is charged with high-capacity lithium-ion battery so that it prolongs the working hours of current meter, which solve the high cost caused by cable length as well as shallow-depth working. This project is adopted modern wireless transmission technology, wireless charging technology and large-capacity storage technology to achieve the self-recording data storage,therefore, reducing the maintenance difficulty of current meter. For the problem of low measurement precision, we use high precision measurement scheme, the CPU gathers 3D accelerometer data A,3D gyroscope data W and 3D gaussmeter data H, by calculating with quaternion to figure out the attitude angle of the underwater detector, then work out the angle of current. In a word, our device is of great practical value, for its small in size,easy to maintain, long and stable for working,totally meet the various needs in ocean measurement.To make the data collection of current meter’s underwater detector more convenient, we develop matched water data collector,the collector is also adopted the low-power consumption chip STM32F103VE as CPU. With 4.3 decimeter capacitive touch screen to display a good GUI, the device is provided with functions of underwater detector reset, sample interval setting and SD card data collection. The user can also intuitively view the progress of the transfer,the remaining time of the battery such information from the LCD.