Design Of Atmospheric Trace Sulfur Detector Based On ARM11

As the demand for energy increases year by year,environmental pollution caused by sulfur dioxide is becoming serious. At present, atmospheric quality testing equipment relies on import. However, these instruments are expensive. In addition,high maintenance cost is necessary. Therefore, the development of a reliable atmospheric quality detection instrument can reduce dependence on imported equipment.Combine current SO2 detection research with embedded technology, this paper presents a design for atmospheric sulfur content detector. First, sulfur in the air is converted into sulfur dioxide. Then, the content of sulfur dioxide is determined by using ultraviolet fluorescence method to detect the sulfur content in the air. This detection system shows obvious advantages, such as strong anti-interference ability,high resolution and fast detection. The detector uses ARM11 microprocessor and Windows CE6.0 operating system. Through serial port, atmosphere trace sulfur detector completes data communication with ARM 11 microprocessor. And the application software realizes these functions: real-time monitoring detection process and archiving the detection data.The hardware part of the system is- mainly composed- of oxidative cracking furnace, sulfur reaction chamber, temperature and gas flow controller, main control circuit board and display screen. On this basis, other modules such as optical detection, gas path, power supply, photo-multiplier tube high power control,temperature and gas flow rate detection and control, and serial port communication are designed. Drawing the testing data in waveform, calculating the sample content and saving data are realized in application software. At present, the hardware design of the system and application software development have been completed. In addition, it has been verified by testing that the system performs good real-time characteristic. Automation, integration and minimization of the sulfur content detector have been achieved, and it can basically met the detection requirements of atmospheric sulfur content.