Soft-Field Tomography Data Acquisition Error Compensation
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Solution Overview
Problem
Soft-field tomography methods, such as EIT and AIT, face challenges in accurately imaging internal structures due to systematic and phase errors from the data acquisition system, which are not adequately addressed by existing methods, leading to reduced imaging accuracy and resolution.
Innovation Solution
A data acquisition and processing method where the signal generator is connected to a common potential, with a reference element of known resistance, allowing for the measurement and compensation of systematic errors, and data acquisition is performed with multiple frequencies to create an overdetermined equation system, enhancing the accuracy and resolution of soft-field tomography imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If soft-field tomography methods are used to image internal structures, then nondestructive analysis is achieved, but systematic and phase errors from the data acquisition system reduce imaging accuracy and resolution
Solution Approach 1:
The patent applies preliminary action by performing calibration measurements before actual tomography measurements. A calibration object with known properties is measured first to determine systematic errors and phase shifts, which are then used to correct the subsequent measurements of the actual object, thereby improving imaging accuracy
Solution Approach 2:
The patent implements feedback by using the measured calibration data to adjust and correct the measurement system's systematic errors. The calibration results provide feedback information about phase shifts and amplitude errors, which are fed back into the measurement process to compensate for these errors in real-time
2Loss of information
If multiple frequencies are used for data acquisition, then the information content and resolution of measurement data increase, but the complexity of the measurement system and processing increases
Solution Approach 1:
The patent applies periodic action by using multiple discrete frequency points for excitation signals during data acquisition. Instead of continuous frequency sweeping, the system uses periodic excitation at specific frequency points, which simplifies the measurement process while still capturing sufficient information for accurate impedance tomography reconstruction
Solution Approach 2:
The patent implements parameter changes by varying the excitation frequency as a controlled parameter to extract frequency-dependent impedance information. By changing frequency parameters and measuring the corresponding responses, the system obtains richer information about the object's internal structure without requiring complex multi-parameter simultaneous measurement
Data Source
AI summary
A measuring system (100) for data acquisition in soft-field tomography analysis of an object (62) includes transmitting units (63-i), receiving units (65-j), measuring units (67-j), an excitation unit having an alive point (“hot spot”; 81) and a ground point (“cold spot”; 82), a measuring data acquisition unit (85), and a control unit (90). In the operational state, the control unit (90) controls the excitation unit and the measuring data acquisition unit (85); the excitation unit connects to a transmitting unit (63-i), one at a time, to drive the transmitting units (63-i). Transmitting units (63-i) and the receiving units (65-j) couple, one by one, with the object (62) to excite and detect response upon the excitation field, wherein the receiving units (65-j) connect together in pairs to form measuring circuits to characterize the detected response quantitatively by measurement data.