Temperature and humidity compensation method of carbon fiber cement paste piezoresistive sensors

The conception and the sensing principle of embedded-style carbon fiber cement paste piezoresistive sensors suitable for local compressive stress and strain monitoring of concrete structures were introduced. The influence of environmental temperature and humidity on the zero-output performance was analyzed. The temperature and humidity compensation methods were discussed based on the circuit design of sensors. The results show that the environmental temperature and humidity have great influences on the zero-output of carbon fiber cement paste piezoresistive sensors and their effects are about 6% and 200%, respectively. A compensation circuit of carbon fiber cement paste piezoresistive sensors is built up by a measurement-compensation dual form to eliminate the influence of noise signals made by temperature, humidity and polarization on zero-output.