Chin. Phys. Lett.  2018, Vol. 35 Issue (1): 014301    DOI: 10.1088/0256-307X/35/1/014301
FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
Lorentz Force Electrical Impedance Detection Using Step Frequency Technique
Zhi-Shen Sun1,2,3, Guo-Qiang Liu1,2**, Hui Xia1
1Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190
2University of Chinese Academy of Sciences, Beijing 100049
3Univ Lyon, Université Claude Bernard Lyon 1, Centre Léon Bérard, INSERM, LabTAU UMR1032, LYON F-69003, France
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Abstract Lorentz force electrical impedance tomography (LFEIT) inherits the merit of high resolution by ultrasound stimulation and the merit of high contrast through electromagnetic field detection. To reduce the instantaneous peak power of the stimulating signal to the transducer, the sinusoidal pulse and step-frequency technique is investigated in LFEIT. The theory of application of step-frequency technique in LFEIT is formulated with the direct demodulation method and the in-phase quadrature demodulation method. Compared with the in-phase quadrature demodulation method, the direct demodulation method has simple experimental setup but could only detect half of the range. Experiments carried out with copper foils confirmed that LFEIT using the step-frequency technique could detect the electrical conductivity variations precisely, which suggests an alternative method of realization of LFEIT.
Received: 29 August 2017      Published: 17 December 2017
PACS:  43.80.+p (Bioacoustics)  
  72.55.+s (Magnetoacoustic effects)  
  73.50.Rb (Acoustoelectric and magnetoacoustic effects)  
Fund: Supported by the National Natural Science Foundation of China under Grant Nos 51137004 and 61427806, the Scientific Instrument and Equipment Development Project of Chinese Academy of Sciences under Grant No YZ201507, and the China Scholarship Council Program under Grant No 201604910849.
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Zhi-Shen Sun, Guo-Qiang Liu, Hui Xia 2018 Chin. Phys. Lett. 35 014301
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http://cpl.iphy.ac.cn/10.1088/0256-307X/35/1/014301       OR      http://cpl.iphy.ac.cn/Y2018/V35/I1/014301
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Zhi-Shen Sun
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Hui Xia
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