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In this paper, an electromagnetic (EM) sensor which can operate simultaneously in capacitive and inductive modalities is developed, and a novel measurement strategy is proposed accordingly. The sensor is composed of two planar spiral coils with large track width, which promotes its capacitive mode. The capacitive coupling is measured in common mode while the inductive coupling is measured in differential...
A low-cost integrated ERT system based on serial bus and 2 evaluation boards with 8 electrodes is designed and implemented. Tikhonov regularization is adopted for image reconstruction with conductance values measured from the designed system. Test results suggest that the system can produce reliable and repeatable measurements for image reconstructions of multiple objects with the cost lower than...
In multifunctional food and detergent production lines, accurate identification of ending point of the cleaning process for the previous product is crucial to ensure product integrity. In this paper, a commercial electrical resistance tomography system was applied to monitoring a lab Cleaning-In-Place circuit. Several image reconstruction algorithms are compared for the accurate identification of...
This paper presents the software and hardware design aspects of the first digital MIT system. Excitation signal generation, receiving signal demodulation and channel multiplexing control are all implemented inside a Xilinx FPGA (Spartan III). The image reconstruction software is written in VC++ and real time images up to 200 frames /second can be achieved for 50 K Hz excitation. Fitted with an 8 coil...
This paper presents a novel method to increase the signal to noise ratio in MIT data acquisition by exploiting transient process analysis. In front-end circuits for inductance measurements in MIT, a critical step is the phase sensitive demodulation, which includes a low pass filter. When the excitation source is switched from one coil to the next, a transient process occurs as the received voltage...
Electromagnetic measurement has advanced rapidly in recent years because of its characteristics of non-contact and non-invasion nature. This paper presents an electromagnetic measurement system based on Field Programmable Gate Arrays (FPGA). The core of the system is a FPGA chip in which DDS, FIFO, digital demodulation module and MCU are embedded. The system consists of a flexible multi-frequency...
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