Detailed explanation of the 4 detection methods of ultrasonic sensors

- Aug 19, 2020-


Sensor technology has huge application potential, and it is an essential part of highly automated systems and even modern cutting-edge technologies. As a detection device, the sensor can not only sense the information being measured, but also transform the sensed information into electrical signals or other required forms of information output according to certain rules. However, the sensor output signal should be easy for information transmission, Processing, storage, display, recording and control requirements.


With the development of electronics and microelectronics technology, the development of sensors is also changing with each passing day. People use sensors in production and life, and there are more and more types such as: wireless sensors, radar sensors, infrared light temperature sensors, geomagnetic objects Detection sensor, special light source sensor: a sensor dedicated to measuring water. Ultrasonic sensors belong to the most widely used category of sensors. Ultrasonic sensors use the characteristics of ultrasonic technology to perform sensing work. Next, OSENON engineers will introduce the detection method of ultrasonic sensor.
 

According to the volume, material, and mobility of the detected object, the sensor detection applications include: presence detection: presence/absence/in-position/counting of the detected object; color detection: detection of the color/density of the distinguished object; size measurement: long/ Width/height/thickness/temperature/distance; deviation detection: appearance detection. However, the detection methods used by ultrasonic sensors are different. There are four common detection methods as follows:


1. Penetrating type:
The transmitter and the receiver are located on both sides, when the detected object passes between them, the detection is performed according to the attenuation (or occlusion) of the ultrasonic waves.


2. Limited distance type:
The transmitter and the receiver are located on the same side, and when a detected object passes within a limited distance, the detection is performed based on the reflected ultrasonic waves.


3. Restricted range type:
The transmitter and the receiver are located in the center of the limited range, and the reflector is located at the edge of the limited range, and the attenuation value of the reflected wave when not blocked by the detection object is used as the reference value. When an object to be detected passes through within the limited range, the detection is performed according to the attenuation of the reflected wave (compare the attenuation value with the reference value).


4. Retro-reflective:
The transmitter and the receiver are located on the same side, and the detection object (flat object) is used as the reflection surface, and the detection is performed according to the attenuation of the reflected wave.
 

ultrasonic sensor detection method and application principle


Based on the above method, the state of a sensor can be detected. If accurate detection is required, different detection methods and standard ultrasonic sensors need to be used according to different occasions. For the detection of the sensor, the sensor should be calibrated according to the detection of different environments and changes in output signals. And when conditions permit, temperature detection is carried out on related parameters. At present, the ultrasonic sensor provided by OSENON is a sensor based on the principle of ultrasonic waves. It is used to help all objects to be detected obtain information about their surrounding environment. It can not only accurately detect objects and distances, but also provide excellent background suppression and protection from the environment. The influence of many types of impurities. Detect object information at different distances through non-contact or contact modes

 

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