Low cost, high precision measuring method base on voltage frequency conversion principle
A technology of voltage frequency conversion and measurement method, which is applied in the direction of measuring devices, reducing unwanted effects, instruments, etc., can solve the problems of poor measurement accuracy and repeatability of measurement results (poor identity, different resolution and accuracy, etc., to achieve Increased accuracy, good resolution and accuracy, and improved repeatability
Inactive Publication Date: 2005-01-12
ZHEJIANG UNIV
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[0002] Applied in the process industry, the traditional measurement method and its corresponding system based on the voltage frequency conversion measurement technology generally have the defect of poor measurement accuracy
The specific manifestations are: under different external conditions, the repeatability (identity) of the measurement results of the same measurement system is poor; under the same external conditions, different measurement systems have different one-way deviations; the field signals of different specifications, the measurement system presents different Resolution and Accuracy
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[0014] On the basis of the traditional voltage-frequency conversion measurement method, the present invention introduces two capture techniques. In the process of on-site signal acquisition, two or more timings are carried out through software or a combination of software and hardware. During the same voltage-frequency conversion process The pulse counts are processed twice, so as to eliminate the unstable pulse counts at the initial end stage of the measurement. The repeatability (identity) of the measurement results of the same measurement system is increased by ten times under different external conditions.
[0015] Based on the traditional voltage-frequency conversion measurement method, the present invention introduces an internal reference source on-line correction technology, an external standard voltage source off-line calibration and an external zero compensation technology. By measuring the standard signal of the internal reference source, the one-way deviation cause...
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Capturing and getting rid of unstable signal collected at site in initial and ending moment of voltage frequency conversion phase improves repeatability of measured result. Online correction for interior reference source, off line correction for external reference source and external zero compensation eliminate unidirectional deviation in measured results caused by dispersed parameters of components in measuring systems. Soft automatic gain control technique of combining testing sampling and formal sampling selects optimal amplification coefficient for site signal automatically so as to make site signals in different amplitudes possess favorable resolution and precision. The invention raises precision of measuring system.
Description
technical field [0001] The invention relates to a low-cost and high-precision measurement method based on the principle of voltage-frequency conversion. Background technique [0002] Applied in the process industry, the traditional measurement method and its corresponding system based on the voltage-frequency conversion measurement technology generally have the defect of poor measurement accuracy. The specific manifestations are: under different external conditions, the repeatability (identity) of the measurement results of the same measurement system is poor; under the same external conditions, different measurement systems have different one-way deviations; the field signals of different specifications, the measurement system presents different Resolution and Accuracy. The traditional voltage-frequency conversion measurement method uses multiple on-site input signals to be converted into voltage signals in parallel through the signal conditioning...
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Login to View More IPC IPC(8): G01D3/028G01D21/02
Inventor 姬亚鹏吴明光黄克强张伟
Owner ZHEJIANG UNIV