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Comparison methods for high accuracy nano wood fiber strain measurement with the errors analysis

For measuring nano wood fiber strain, a whole range of perturbing factors on the primary converters and circuit elements degrade the metrological characteristics. An approach to the design of measuring circuit, based to the principle of double-channel parametric measurement, is proposed to improving the accuracy of the measured result. Three measuring circuits based on the principle are designed, and errors of conversion functions of them are analyzed, which shows the approach is effective to solve the problem of the measuring strain, and it is worthwhile for other measuring circuits.