DESIGN AND APPLICATION OF DIGITAL FATIGUE SENSOR

For the problem of bad accuracy due to the strong noise from the analog signal transmitting and the strong temperature output in fatigue damage monitoring,a digital fatigue sensor was introduced,which based on the ADuC845. It had temperature compensation,nonlinear calibration and communication by RS-485. Also there were voltage regulators,high precision and low temperature coefficient reference and power supply circuits on the sensor. The Rayleigh density distribution which was the loading characteristic of bridge structure response was also conducted successfully. The relation between resistance change of fatigue life gauge and Rayleigh distribution parameter was established by a calculation program with dual sensor design in a fatigue life gauge and its great no-linearity character.