Modern sensor technology has enormous application potential and is a key component of highly automated systems and even modern cutting-edge technologies. As a detecting device, the sensor can not only sense the measured information , but also transform the detected information into an electrical signal or other required form of information output according to a certain rule, but the sensor output signal should be easy to transmit information, Requirements for processing, storage, display, recording, and control.
With the development of electronic and microelectronic technologies, the development of sensors is changing with each passing day. People use more sensors in production and life, and more and more types are : wireless sensors, radar sensors, infrared light sensors, geomagnetic magnetic objects. Detection sensor, special light source sensor: A sensor dedicated to water measurement . Ultrasonic sensors are one of the most used types of sensors. Ultrasonic sensors use the characteristics of ultrasonic technology to perform sensing work. For this reason, we will introduce the detection method of ultrasonic sensors for everyone.
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The application volume of the detected object, material, and other features and whether the mobile sensor detecting comprises: detecting the presence or absence of: detecting presence or absence of an object / place / count; Color Detection: object distinguishing color detection / concentration; Size Measurement: Length / width / height / thickness / temperature / distance; deviation detection: appearance detection. However , the detection methods used by ultrasonic sensors are different. The common detection methods are as follows:
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Penetrating type: The transmitter and the receiver are respectively located on both sides, and when the object to be detected passes between them, the detection is performed according to the attenuation (or occlusion) of the ultrasonic wave.
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Limited distance type: The transmitter and the receiver are located on the same side, and when there is a detected object passing through the defined distance, the ultrasonic wave is detected according to the reflection.
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Scope: The transmitter and receiver are located at the center of the limited range, and the reflector is located at the edge of the limited range, and the reflected wave attenuation value when there is no object to be detected is used as the reference value. When the object to be detected passes within the limited range, it is detected based on the attenuation of the reflected wave (the attenuation value is compared with the reference value).
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Retro-reflective type: The transmitter and the receiver are located on the same side, and the detection object (planar object) is used as a reflection surface, and is detected according to the attenuation of the reflected wave.
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Based on the above method, the state of one sensor can be detected. If precise detection, it is necessary according to different situations and using an ultrasonic sensor for detecting the standard mode, the detection of the sensor, according to the detected output signals in different environments and variations, to calibrate the sensor. And when the conditions permit, the relevant parameters are temperature tested. Currently preclude ultrasonic sensor station network to provide an ultrasonic sensor is based on the principle, all need to be used to help detect objects in the surroundings get information, and the object distance can be detected not only accurate, but also provide excellent background suppression and not The effects of multiple types of impurities in the environment. Detecting the distance to the object information of different non-contact or a contact mode.
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