Ultrasonic sensor or distance sensor module, commonly
known as ultrasonic distance sensor .Types of ultrasonic sensors at present, the common types of ultrasonic sensors mainly include the following
1. General ultrasonic sensors. The loan of ultrasonic sensors is generally thousands of Hertz and has frequency selection characteristics. When the circuit is open, the output voltage of the sensor is high, but the impedance is also high. It is easy to be affected by noise. Generally, a resistance of thousands of ohms to hundreds of thousands of ohms should be connected. The universal ultrasonic sensor has narrow frequency band, high sensitivity and strong anti-interference. Its receiving sensor and transmitting sensor are used separately.
2. When the broadband ultrasonic sensor is used in multi-channel, it is convenient to use the broadband sensor. The broadband ultrasonic sensor has two resonant frequencies in the working bandwidth. Its frequency characteristic is equivalent to the combination of two sensors. Therefore, it has high sensitivity in a very wide frequency band. Because the broadband sensor has two resonance points, one sensor can be used as both receiving sensor and transmitting sensor.
3. Sealed ultrasonic sensor the sealed ultrasonic sensor has strong adaptability to the natural environment and can be used in the device for detecting objects at the rear of the car and the waiting calculator.
4. The specification of high frequency ultrasonic sensor ma200a1 (shared by transmitter and receiver) has a center frequency of up to 200kHz, which can carry out high-resolution measurement. The directivity and reflection angle of this kind of sensor are relatively narrow.
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Automatic distance sensing module
FBUSD-001
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ultrasonic distance sensor
FBUSD-004
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Structure of FBelec’s (companies that make sensors) Ultrasonic sensor
The commonly used ultrasonic sensor is composed of piezoelectric wafer, which can not only transmit ultrasonic wave, but also receive ultrasonic wave. Low power ultrasonic probe is mostly used for detection. It has many different structures, including straight probe (longitudinal wave), angle probe (transverse wave), surface wave probe (surface wave), Lamb wave probe (Lamb wave), double probe (one probe transmits, one probe receives), etc.
The working frequency is the resonant frequency of the piezoelectric wafer. When the frequency of the AC voltage applied to both ends is equal to the resonant frequency of the chip, the output energy is the largest and the sensitivity is the highest.
1.working frequency 2.working temperature 3.sensitivity 4.Directivity1.working frequency
The working frequency is the resonant frequency of the piezoelectric wafer. When the frequency of the AC voltage applied to both ends is equal to the resonant frequency of the chip, the output energy is the largest and the sensitivity is the highest.
2.working temperature
Because the Curie point of piezoelectric materials is generally high, especially the power of ultrasonic probe for diagnosis is small, so the working temperature is relatively low and can work for a long time without failure. The temperature of ultrasonic probe for medical use is relatively high, so separate refrigeration equipment is required.
3.sensitivity
It mainly depends on the manufacturing chip itself. Large electromechanical coupling coefficient and high sensitivity; On the contrary, the sensitivity is low.
4.Directivity
Detection range of ultrasonic distance sensor
Test Method of ultrasonic sensors from FBelec ,sensor manufacturers and sensor suppliers.
According to the volume, material and movable characteristics of the tested object, the ultrasonic sensor adopts different detection methods. There are four common detection methods as follows:
1.Penetrating 2.Limited distance type 3.Limited range type 4.Regression reflection type1.Directivity
the transmitter and receiver are located on both sides respectively. When the detected object passes between them, it is detected according to the attenuation (or occlusion) of ultrasonic wave.
2.Limited distance type
the transmitter and receiver are located on the same side. When the detected object passes through within the limited distance, it will be detected according to the reflected ultrasonic wave
3.Limited range type
the transmitter and receiver are located in the center of the limited range, the reflector is located at the edge of the limited range, and the reflected wave attenuation impairment when there is no occlusion by the detected object is taken as the reference value. When the detected object passes through within the limited range, it is detected according to the attenuation of the reflected wave (compare the attenuation value with the reference value).
4.Regression reflection type
the transmitter and receiver are located on the same side, and the detection object (plane object) is used as the reflection surface to detect according to the attenuation of the reflected wave.
Use of ultrasonic sensor
Ultrasonic distance sensor can be widely used in material level (liquid level) monitoring, robot anti-collision, various ultrasonic proximity switches, anti-theft alarm and other related fields. It has the advantages of reliable operation, convenient installation, waterproof type, small emission angle and high sensitivity. It is convenient to connect with industrial display instruments, and also provides probes with large emission 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 pellet chamber and sends sound waves to the inside of the container, the state of the container can be analyzed, such as full, empty or half full.
2. Ultrasonic sensors can be used to detect transparent objects, liquids, any rough, smooth, light dense materials and irregular objects. However, it is not applicable to outdoor, extremely hot environment or pressure tank and foam objects.
3. Ultrasonic sensor can be applied to food processing plants to realize the closed-loop control system of plastic packaging detection. With the new technology, it can be detected in the humid environment, such as bottle washer, noise environment, extremely violent temperature change environment, etc.
4. Ultrasonic sensors can be used to detect liquid level, detect transparent objects and materials, control tension and measure distance. They are mainly used in packaging, bottle making, material handling, coal inspection 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.
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