Study on gas leakage localization method based on ultrasonic sensor area array

In order to realize leakage detection and leakage localization by ultrasonic waves leak generated, ultrasonic gas leak location method based on sensor array is proposed, and it achieves accurate positioning of the leak point only by time difference of arrival between leak point and sensors. Use envelopes of ultrasonic signals received by sensors to obtain whole cycle numbers of time difference of arrival, combined with remaining time difference (i.e. the part of time difference of arrival less than one signal cycle) calculated by the traditional cross-correlation algorithm, then the time difference of arrival is obtained. According to the TDOA positioning algorithm, equation group to solve the leak location is written. Finally, use combination of least square method and Newton iteration method to estimate leak location. The experimental results show that this method can accurately estimate the leak location, verifying the correctness and feasibility of the method.