Development of Foundation Pit Leakage Detector based on Flow-field Fitting Method

Flow-field Fitting Method is a brand-new physical detection technology which is put forward by Academician He Jisan of Central South University.This paper gives a detailed introduction to Foundation Pit Leakage Detector based on Flow-field Fitting Method,which mainly includes transmitter,receiver and host computer control software. The transmitter transmits 3-12V adjustable amplitude bipolar square wave, the receiver uses FPGA + MCU frame.After amplification and acquisition, the signal is processed by fast fourier transform (FFT) in FPGA.The result is stored in FPGA provisionally and finally fetched by MCU,effective data are selected by Zigbee wireless communication system to upload to the host computer. By using the drawing software Surfer to draw potential contour map of harmonics under every frequency. The location of leakage could be ascertain through the distribution of potential. Through laboratory simulation and building field measurement, the reliability and stability of Foundation Pit Leakage Detector are verified.