When temperature of environment varies

wireless strain acquisition node has temperature drift error which affects its measurement precision.Main reason of temperature drift error is difference between temperature coefficients of bridge arm resistances.According to relationship between temperature drift error and temperature

premeasure node temperature drift error of some typical temperature point by experimental method

cubic spline interpolation algorithm is adopted to correct measurement datas

realize software compensation of temperature drift error of wireless strain acquisition node.Experimental result shows that temperature drift error is less than±10×10-6/℃ after compensation

which is reduced by 75% compared with which is before compensation

within the temperature range of 25

5

7 ℃

and the measurement precision is also significantly improved while measuring longitudinal temperature force of continuous welded rails by simulation device.