separating distance method of ultrasonic sensor

   At present, there are two types of ultrasonic transducer sensor, one is an in-vehicle integrated probe, other is an integrated transmitting and receiving probe . The other is a separating design for sending and receiving. The basic principle of its implementation is that the transmitting probe emits a series of pulses. After the target is transmitted, the receiving probe of transducer for distance can calculate the distance from the measured target according to the time and speed of transmission. This design is low in cost and easy to implement. However, this method achieves a maximum distance substantially within. At the same time, the sensor will have a large difference between the obtained data and the real value due to the manufacturing process and some uncertain factors. In view of this situation, the current measurement and fusion of the distance measuring transducer through time-multiplexed data is a direction of sensor development. Its main working principle is to use a sensor to measure the same object multiple times and pass the information through certain.

The method performs fusion processing to obtain a measurement with smaller error, higher precision and accuracy, which can reflect the information characteristics of the measured object more completely and accurately. Algorithm for data fusion. In the fields of laser radar, infrared, sonar, image acquisition, etc.ultrasonic distance measuring transducer has been fully applied. Among them, the ultrasonic fusion sensor data fusion method mainly includes digital averaging, fuzzy judgment, Bayesian estimation and a reasoning, digital filtering, and the like. Each of these calculation methods has its own advantages and disadvantages. Therefore, for smart devices, the data obtained by the sensors is crucial to their intelligent judgment. This paper aims at the advantages and disadvantages of data fusion.

   It is a traditional transmission and reception integrated mode. When the Ultrasonic distance sensor sends a series of ultrasonic signals and is reflected by the object at the measured distance, the receiver will receive the corresponding ultrasonic signal, so that the distance can be calculated according to the speed and time, and generally does not exceed the left and right. The improved ranging principle is shown in the figure. When the ultrasonic transducer for heat meter sends an ultrasonic signal and sends a wireless signal, the probe module starts timing when it receives the wireless signal. When the ultrasonic signal is reached, the timer is turned off, so that the ultrasonic speed and time can be used. Calculate the distance, after a number of time-division ranging, and then according to the data fusion algorithm, the exact distance can be calculated, and the distance is the traditional mode, both left and right.