Designing Photoelectric Sensor Module in Infrared Communication and Applying Wireless Sensor Network in Leakage Cable Detection

Abstract

With technological advancement, Near-infrared (NIR) spectroscopy instruments have gradually entered people’s daily life and production with their unique performance. Therefore, it has a positive significance in researching NIR spectroscopy analysis technology. This work designs a refrigerating Lead Sulfide (PbS) NIR photoelectric sensor P2664-05 and its photoelectric signal conversion circuit. The converted voltage signal is used for subsequent circuit processing through the amplification and frequency selection circuit. The aim is to ensure the sensor’s corresponding detectable spectral wavelength, sensitivity, and signal-to-noise ratio are improved under low temperatures. To this end, the refrigeration current generation circuit is designed. The refrigerating temperature is set below −15 °C, and the refrigerating current is 500 mA. At the same time, it is necessary to monitor whether the sensor’s temperature state meets the system stability requirements during the refrigeration process. The designed sensor module is connected to the instrument system in the test, and the whiteboard without spectral absorption is scanned. The results show that the designed NIR sensor’s shortcomings in noise processing performance have been improved using a System on a Programmable Chip (SoPC) as a processor. An infrared communication node is designed using its built-in digital resources and TFDU infrared communication chip. The designed NIR sensor and communication node are added to the 485 bus to build a communication network. In leakage cable detection, the communication network has higher security, lower error rate, and lower power consumption.