Commonly used ultrasonic sensors are made up of piezoelectric wafers that can either transmit or receive ultrasonic waves. The small power ultrasonic probe can be used for detection. It has many different structures, such as straight probe (longitudinal wave), oblique probe (shear wave), surface wave probe (surface wave), lamb wave probe (lamb wave), double probe (one probe emission, one probe reception), etc.
Mainly use The application of ultrasonic sensor technology in different aspects of production practice, and medical application is one of its most important applications. The following is an example to illustrate the application of ultrasonic sensor technology. The application of ultrasound in medicine is mainly to diagnose diseases, and it has become a common diagnostic method in clinical medicine. The advantage of ultrasonic diagnosis is that it is painless, simple, clear and high diagnostic rate. Therefore, the promotion is easy and popular among medical workers and patients. Ultrasound diagnosis can be based on different medical principles, and let's look at one of the most representative of these so called a-type methods. The method USES ultrasonic reflections. When ultrasonic wave propagates in human tissue, it encounters two layers of medium interface with different acoustic impedance. The echo is displayed on the oscilloscope screen at each reflection surface, 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. In the past, many technologies have been hampered by the inability to detect tissue, and the advent of ultrasonic sensors has changed that. Of course, many ultrasonic sensors are mounted on different devices to "silently" detect the signals people need. In the future In application, ultrasonic wave will be combined with information technology and new material technology, and intelligent and highly sensitive ultrasonic sensors will appear.
Application of ultrasonic distance sensor technology Ultrasound has a great ability to penetrate liquids and solids. In opaque solids, it can penetrate to a depth of tens of meters.
When the ultrasonic wave encounters impurities or boundary surface, it will reflect and form reflected echo. When it encounters the moving object, it will generate doppler effect. Therefore, ultrasonic testing is applied in industry, national defense, biomedicine and other aspects.
The ultrasonic distance sensor can be applied in the field of object position (liquid level) monitoring, anti-collision of robot, ultrasonic proximity switch, and anti-theft alarm. It is easy to install, waterproof, with small emission Angle, high sensitivity, convenient to connect with industrial display instruments, and also provides a probe with large emission Angle.
Apply I. ultrasonic sensors can detect the status of containers. When the ultrasonic sensor is installed on the top of the plastic melt tank or plastic pellet chamber, the state of the container, such as full, empty or half full, can be analyzed according to the acoustic wave emitted to the container.
Ultrasonic sensors can be used to detect transparent objects, liquids, surface roughness, smoothness, optical density materials and irregular objects. It is not suitable for outdoor, hot or pressure tank or foam objects.
Ultrasonic sensors can be used in food processing plants to realize the closed loop control system of plastic packaging testing. Combined with the new technology, it can be detected in the humid ring such as bottle washing machine, noise environment, temperature extremely dramatic change environment and so on.
Ultrasonic sensors can be used to detect liquid level, detect transparent objects and materials, control tension and measure distance, mainly for packaging, bottle making, equipment transportation of material moving and inspecting coal, plastic processing and automobile industry. Ultrasonic sensors can be used for process monitoring to improve product quality, detect defects, determine presence and otherwise.
Use ultrasonic sensor technology to prevent pedal misstep Nissan has developed a feature that prevents the vehicle from accelerating when the pedal is applied to the brake, using cameras and ultrasonic sensors to infer "parking in a parking lot" when the driver is pressed on the accelerator. The technology is expected to be practical within two to three years. Ultrasonic sensor technology is developed to prevent accidents caused by the wrong brake and accelerator pedal when parking in a parking lot.
The technology is implemented using four cameras, one on the front and one on the left, one on the right, and four ultrasonic sensors, one on the front and one on the rear. The four cameras follow the "look around display" camera that shows the vehicle's surroundings overlooking the image. The camera is used to identify the white line and so on to infer that the car is located in the parking lot. The ultrasonic sensor is used to measure the distance between the car and the surrounding obstacles to determine the braking time.
To prevent accidents caused by misapplying the brake and accelerator in two steps. When the driver wants to stop in the parking lot, if he steps on the gas pedal, he will reduce the speed to creeping speed first, use the dashboard icon to alert the danger and sound an alarm. Force the brakes if the driver continues to pedal on the gas and will hit objects such as walls. The braking time is to ensure that the car can stop when it is about 20 ~ 30cm away from the obstacle.