Constant-voltage bridge nonlinear correction method for three-wire system quarter-bridge large strain measurement
A nonlinear correction, three-wire technology, applied in the field of sensor measurement, can solve the problems of delayed, unusable, and complicated calculation results, and achieve the effect of avoiding errors and calculation delays, simple software algorithms, and high algorithm accuracy.
Active Publication Date: 2020-12-18
JIANGSU DONGHUA TEST CORP
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Problems solved by technology
The error of the normal strain measurement system is required to be within ±(0.5%red±3με), if no correction is made, the error will exceed 1% at 10000με, and more than 2% at 20000με, so no correction will bring the actual measurement results Larger errors, in serious cases, will cause measurement data analysis to output wrong conclusions, thus directly affecting data application in structural design optimization
[0006] Existing nonlinear correction algorithms may be too complex, resulting in high computing power requirements and low real-time computing efficiency
On the one hand, it is easy to cause delays in the calculation results, so that the measurement results cannot be presented in real time, and the signal cannot be used as a trigger control; on the other hand, during long-term high-speed acquisition of thousands of channels, the computer or software crashes due to computing power, which cannot be applied to multi-channel dynamic Or ultra-dynamic three-wire quarter bridge large strain long-term synchronous test
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[0043] Such as figure 1 As shown, R represents the strain resistance of the actual external connection. The resistance value of the strain resistance is variable and will change with the deformation of the tested object. R 0 , R 3 , R 4 They are all three-wire quarter bridge Wheatstone bridge matching resistors, which are known constants. The r in the loop is the resistance of the wire connected to the strain gauge. This value is a known constant, which can be measured automatically by a multimeter or a resistance strain gauge with automatic wire resistance measurement. Eg in the figure is the constant voltage supply voltage of the three-wire quarter bridge Wheatstone bridge, and this value is a known constant. 0 is the ground of the power supply, which is used as the reference ground for the voltage change value generated by the power supply of the bridge and the change of the resistance strain gauge.
[0044] Theoretically, according to the Wheatstone bridge measurement...
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The invention provides a constant-voltage bridge nonlinear correction method for three-wire system quarter-bridge large strain measurement. The method comprises the following steps: collecting voltagevalue changes delta(U) at two ends of a built-in matching resistor R0 of the three-wire system quarter-bridge strain gauge when a strain resistor R changes; and calculating a change value R of the strain resistor based on voltage value changes delta(U) at two ends of a built-in matching resistor R0 of the three-wire system quarter-bridge strain gauge: substituting the change value delta(R) of thestrain resistor into a strain theoretical calculation value formula for calculation to obtain an actually measured strain value [mu]epsilon, and solving a measurement error caused by nonlinearity. The method can realize non-linear correction of the Wheatstone bridge three-wire system quarter-bridge with constant-voltage power supply during large strain measurement, is simple and efficient, and can ensure that the measurement indication error of test equipment is within the index range of + / -(0.5% red + / -3 [mu]epsilon) on the premise of not changing any hardware.
Description
Technical field: [0001] The invention relates to a non-linear correction method of a constant voltage bridge for large strain measurement of a three-wire quarter bridge, belonging to the technical field of sensor measurement. Background technique: [0002] The Wheatstone bridge is a classic resistance strain test circuit technology. The actual measurement bridges are divided into full bridge, half bridge and quarter bridge. The quarter bridge is divided into two-wire system and three-wire system. There are two methods of quarter bridge, and the three-wire quarter bridge is the most widely used strain measurement bridge method in current material strength research because it is easy to use and can realize software algorithm compensation. [0003] Usually, the strain test system will only calibrate the half-bridge and full-bridge methods when performing measurement calibration, but generally will not calibrate the quarter-bridge method. Measurement accuracy is guaranteed. Ho...
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IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 徐立陈泳王江波
Owner JIANGSU DONGHUA TEST CORP