Multifrequency EM image system

Qing Zhang; Xuemin Chen; Xuhan Jiang; C. Richard Liu

doi:10.1117/12.390632

6 July 2000 Multifrequency EM image system

Qing Zhang, Xuemin Chen, Xuhan Jiang, C. Richard Liu

Proceedings Volume 4129, Subsurface Sensing Technologies and Applications II; (2000) https://doi.org/10.1117/12.390632
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

A digital, multi-frequency EM image system is developed based on the induction principle for subsurface imaging near a sewage pipe. This system, which features a broadband operation, can transmit sinusoidal in a frequency range of 1.25 KHz to 10 KHz. A micro controller is used for all controls and computations for both the transmitter and receiver circuits. Synchronous sampling is used for digitization in order to compute the phase as well as the amplitude of the receiving signal. The system operates in the frequency domain and both the phase and amplitude information can be computed through a DSP algorithm. Test results indicate that the multi-frequency EM sensor is superior in both the missing manhole detection and general subsurface conductivity imaging to the conventional single- frequency sensors. For loop antennas with a spacing of 0.5 m, the system has phase resolution about 1 degree(s) and amplitude resolution about 0.5 percent.

Citation Download Citation

Qing Zhang, Xuemin Chen, Xuhan Jiang, and C. Richard Liu "Multifrequency EM image system", Proc. SPIE 4129, Subsurface Sensing Technologies and Applications II, (6 July 2000); https://doi.org/10.1117/12.390632

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