钢筋形变测量仪设计

Instrument Design for Rebar Deformation Measurement

电阻式引伸计在微小形变下,电桥的输出电压变化量是毫伏级,为了保证形变测量精度在1μm以内,采用双ADC通道的AD7705来完成形变量的测量和数据转换,同时提出了分段线性化的形变标定方法,试验表明:该方法可以有效控制其测量误差,满足JB/T 6146-2007标准要求。

In small deformation of resistive extensometer,the output voltage of electric bridge stays at a millivolt level. In order to keep the measuring precision within 1 μm,the AD7705 converter with dual ADC channel was used to measure rebar deformation and to convert the data, and meanwhile, the piecewise linear deformation calibration approach was proposed. Experimental results show that this method can control measurement error as the JB/T 6146-2007 standards required.