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Study on Magnetic Marker Monitoring Circuit and Signal Preprocessing

Author: FangXing
Tutor: ZhengXiaoLin
School: Chongqing University
Course: Biomedical Electronics and Information Technology
Keywords: Magnetic positioning Hall sensor Flux sensor Pretreatment Geomagnetic field
CLC: TH772
Type: Master's thesis
Year: 2008
Downloads: 97
Quote: 0
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Abstract


The magnetic marker positioning principle of the method is the use of a magnetic field penetrating non - magnetic shielding objects ( human ) , three-dimensional positioning can be achieved non-visual state , a wide range of applications in the medical field . Positioning with the signal intensity of X - ray fluoroscopy positioning ultrasonic positioning , radio-labeled positioning compared magnetic Markers with no damage , easy to operate features . In this thesis, the magnetic positioning method for gastrointestinal micro- clinic system magnetic sensor array design and magnetic signal preprocessing method -depth study. This paper designed two magnetic field positioning hardware circuit based on a different principle : based on Hall sensor array based flux sensor array . Former Hall sensor , the change of the magnetic field into a voltage signal through the filtered and amplified by the capture card to a PC ; latter flux sensor and its control chips to work together to complete the three-dimensional magnetic field measurement . By contrast experiments , we choose to seek a magnetic positioning circuit suitable for the present system of the above two kinds of sensor array . Collected by the sensor array of the original signal need to be pretreated to improve the SNR of the signal . The commonly used method of smoothing filter , median filtering and wavelet analysis are signal preprocessing . Found through experiments , the method of wavelet default threshold can filter out most of the static magnetic field signal frequency band noise smoothing filter cascaded median filtering method better dynamic signal processing . In this paper , the above approach is comprehensive , co- processing of the magnetic field signal , greatly improving the signal-to-noise ratio . The experiment is the focus of this article . The Hall sensor matching of the magnetic field signal acquisition , the sensor arrangement , signal preprocessing and geomagnetic field disturbance compensation experiment . By comparison of the two hardware circuit , the magnetic flux sensor array acquisition sensitivity and stability of the magnetic field signal , are superior to the Hall sensor array . In summary , the use of the magnetic flux sensor array combined with the valid signal preprocessing method , can greatly improve the accuracy of the magnetic positioning .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Medical and health devices > Medical electrical machinery
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