Main application of ultrasonic sensing technology
Ultrasonic sensor technology is applied in different aspects of production practice, and medical application is one of its most important applications. Next, take medicine as an example to illustrate the application of ultrasonic sensor technology. The application of ultrasound in medicine is mainly to diagnose diseases. It has become an indispensable diagnostic method in clinical medicine. The advantages of ultrasonic diagnosis are: no pain, no damage, simple method, clear imaging, high diagnostic accuracy. Therefore, it is easy to promote and welcomed by medical workers and patients. Ultrasonic diagnosis can be based on different medical principles. Let's take a look at a representative so-called type a method. This method uses the reflection of ultrasound. When the ultrasonic wave propagates in human tissue and meets two media interfaces with different acoustic impedance, the reflection echo will be generated at this interface. When a reflector is encountered, the echo is displayed on the oscilloscope screen, and the impedance difference between the two interfaces also determines the amplitude of the echo.
In industry, the typical application of ultrasonic is nondestructive testing of metal and ultrasonic thickness measurement. In the past, many technologies were hindered because they could not detect the internal tissue of objects. The appearance of ultrasonic sensing technology changed this situation. Of course, more ultrasonic sensors are fixed on different devices, "quietly" to detect the signals people need. In the future application, ultrasonic will be combined with information technology and new material technology, and more intelligent and high sensitive ultrasonic sensors will appear.
Application of ultrasonic distance sensor technology
Ultrasonic can penetrate liquid and solid very well, especially in opaque solid, it can penetrate tens of meters deep.
When ultrasonic touches impurities or interface, it will produce significant reflection and form echo. When it touches moving objects, it will produce Doppler effect. Therefore, ultrasonic testing is widely used in industry, national defense, biomedicine and other fields.
Ultrasonic distance sensor can be widely used in level (liquid level) monitoring, robot anti-collision, various ultrasonic proximity switches, anti-theft alarm and other related fields. It has reliable work, convenient installation, waterproof type, small launch angle, high sensitivity, convenient connection with industrial display instruments, and also provides probes with large launch angle.
1、 Ultrasonic sensors can detect the status of containers. When the ultrasonic sensor is installed on the top of the plastic melt tank or plastic granule room and sends sound waves to the inside of the container, the status of the container can be analyzed accordingly, such as full, empty or half full, etc.
2、 Ultrasonic sensors can be used to detect transparent objects, liquids, any rough, smooth, light dense materials and irregular objects. But it is not suitable for outdoor, hot environment or pressure tanks and foam objects.
3、 Ultrasonic sensor can be used in food processing plant to realize closed-loop control system of plastic packaging detection. With the new technology, it can be detected in the wet environment, such as bottle washing machine, noise environment, extremely violent temperature change environment, etc.
4、 Ultrasonic sensors can be used to detect liquid level, transparent objects and materials, control tension and measure distance, mainly including packaging, bottle making, material handling and inspection of coal equipment transportation, plastic processing and automobile industry. Ultrasonic sensors can be used for process monitoring to improve product quality, detect defects, determine presence or absence, and other aspects.
Using ultrasonic sensor technology to prevent wrong pedal
Nissan has developed a function to prevent the acceleration of the vehicle by mistakenly stepping on the accelerator when it is about to step on the brake. When the camera and ultrasonic sensor are used to infer that the situation of "parking in the parking lot" is "to be stopped", if the driver steps on the accelerator, he will force the brake. The technology is expected to be practical in 2-3 years. Ultrasonic sensor technology is developed to prevent accidents caused by wrong Brake and accelerator when parking in parking lot.
The technology is realized by using four cameras equipped with one at the front and rear of the vehicle, and four eight ultrasonic sensors equipped with the front bumper and the rear bumper respectively. The four cameras follow the "look around display" camera that shows the aerial view around the vehicle. The white line is identified by the camera to infer that the car is in the parking lot, and the distance between the car and the surrounding obstacles is measured by the ultrasonic sensor to determine the braking time.
There are two steps to prevent accidents caused by wrong application of brake and accelerator. When the driver wants to stop in the parking lot, if he steps on the accelerator, first reduce the speed to the creeping speed, use the icon on the dashboard to prompt the danger and sound the alarm. If the driver continues to step on the accelerator and is about to hit an object such as a wall, force the brake.The braking time is to ensure that the car can stop when it is about 20-30cm away from the obstacles.
Ultrasonic sensor technology is applied in different aspects of production practice, and medical application is one of its most important applications. Next, take medicine as an example to illustrate the application of ultrasonic sensor technology.