Design and Output Characteristics of Magnetostrictive Sensor Array for Tire Pattern Detection

A new type of sensor unit is designed, based on the simulation of hair structure and the magnetic sensitive material Galfenol filament, which was integrated into an array. The output characteristic model of the sensor unit is established according to inverse magnetostrictive effect, linear piezomagnetic equation, and material mechanics. The experimental results show that the output voltage of the sensor unit varies linearly under the action of 0–2.4 N. The sensor array has a good stability and response speed. According to the characteristic of tire pattern, a tire pattern sample is selected to measure. A test system is built for data acquisition and storage, and the output characteristics of the sensor array are tested. The integrated sensor array can well identify the pattern characteristics of the selected tire sample, and the maximum absolute error is 0.7 mm.