Ultrasonic distance measurement has a series of advantages, but there are many factors that affect measurement accuracy, so it is difficult to achieve higher accuracy. Based on the principle of ultrasonic distance measurement, a single temperature ultrasonic transducer , humidity compensation scheme

Ultrasonic sensors for range-finding are the basis of many robotic and automaticapplications, such as obstacle avoidance and collision warning systems of cars, self-guidedautonomous vehicles, fieldwork robots and so on. However, there is specified restriction when anairborne ultrasonic transducer is

The UAV ranging transducer system described in this paper applies to the principle of ultrasonic distance measurement, and uses the measurement ultrasonic wave to transmit pulses.The time difference between the wave and the received pulse wave has the relative position is calculated by the speed at

disadvantages and solution of ultrasonic transducer(二) volume of obstacle can not be too small. According to the theory of ultrasonic propagation, when the size of obstacle is less than 1/2 of the length of ultrasonic transducer wave