Two factors: one is to see the transmission power of the ultrasonic sensor; The second is to look at the physical characteristics of the object being detected, such as cement walls, steel plates, area size, indicating the level of leveling, that is, to look at its reflection characteristics
Wavelength and other factors will affect the accuracy of ultrasonic sensors, among which the most important factor is the acoustic velocity with the change of temperature, so many ultrasonic sensors have the characteristics of temperature compensation. This feature enables analog output ultrasonic sensors to achieve repeatability up to 0.6mm over a wide temperature range
The detection range of ultrasonic sensors depends on the wavelength and frequency used. The longer the wavelength, the smaller the frequency and the larger the detection distance. For example, the detection range of compact sensor with millimeter wavelength is 300~500mm and the detection range of sensor with 5mm wavelength is up to 8m. Some sensors have narrower 6& ORDM; The acoustic emission Angle is therefore more suitable for accurate detection of relatively small objects. Other acoustic emission angles are at 12& ORDM; To 15 & ordm; The sensor is capable of detecting objects with a large dip Angle. In addition, we have an external probe type ultrasonic sensor, the corresponding electronic circuit is located in the conventional sensor housing. This structure is more suitable for the detection of limited installation space
Ultrasonic sensors use acoustic media to detect objects without contact wear. Ultrasonic sensors can detect transparent or colored objects, metallic or nonmetallic objects, solid, liquid and powdery substances. Its detection performance is almost not affected by any environmental conditions, including smoke environment and rainy days
If is relegation other, let alone is a person, is a mouse, outloud, but according to the working principle of the ultrasonic sensors, or is there a way to let it not induction, is the "induction" from entering it the moment, then need to put all your action is very slow, and must ensure that all actions, must be uniform mobile! If it is fast or slow, it will be sensed directly
General air medium ultrasonic sensor, is not harmful to the human body
The first thing you need to know is what is the normal range of the output signal (voltage or current) of this sensor? And then measure if its signal is in the normal range. If the measured results have exceeded the normal range, it is certain that the sensor is not working properly. Secondly, you need to know the sensor in a fixed position
Ultrasonic itself is a kind of mechanical wave with high frequency vibration, and it is a kind of signal, which can directly interfere with other ultrasonic waves when the frequency and other conditions meet
There are two kinds of sound sensor: analog sensor and digital sensor. Analog sensor has the advantages of simple, easy to use and cheap. Digital sensor has the advantages of high signal processing precision and signal transmission precision. In fact, the sensing element of digital quantity sensor is basically analog quantity, but it is used in signal processing
Ultrasonic sensor is composed of sending sensor (or wave transmitter), receiving sensor (or wave receiver), control part and power supply part. The transmitter sensor is composed of a transmitter and a ceramic vibrator transducer with a diameter of about 15mm. The function of the transducer is to convert the electric vibration energy of the ceramic vibrator into super energy
Ultrasonic ranging module, the module includes ultrasonic transmitter, receiver and control circuit, can provide 2CM--400CM fee-contact distance sensing function, ranging accuracy up to 3MM
Widely used in industry, national defense, biomedical and other fields
Ultrasonic wave uses the reflection principle, when the emitted signal sends out, meets the object, part of the signal returns, calculates the round trip time /2, multiplied by the wave speed is the distance
Yes, ultrasonic level sensor USES ultrasonic principle, transmitting and receiving time and liquid level or distance conversion is often used in the field of liquid level monitoring. This non-contact method is stable and reliable, so ultrasonic level sensor is widely used.
Yes, because solid, liquid and air can all transmit sound waves
Ultrasonic sensor is a sensor developed by utilizing the characteristics of ultrasonic waves. Ultrasonic wave is a kind of mechanical wave whose vibration frequency is higher than that of sound wave. It is generated by the vibration of the energy exchange chip under the excitation of voltage. It has high frequency, short wavelength and small diffraction phenomenon.
Ultrasonic wave is a part of sound wave, which cannot be heard by human ears and whose frequency is higher than 20KHZ. It has something in common with sound wave, that is, it is generated by material vibration and can only propagate in the medium. At the same time, it is also widely found in nature. Many animals can emit and receive ultrasonic waves, most notably bats, which can use weak ultrasonic echoes to fly in the dark and catch food. But ultrasound also has special properties, such as having a higher frequency and a shorter wavelength, so it is similar to light waves with a shorter wavelength
The oscilloscope can detect it. Ultrasonic transmission is highly directional. The energy is concentrated and the waveform is sine wave. A slightly better frequency meter or oscilloscope can pick it up
The application of ultrasonic technology mainly includes two aspects:
(1) Ultrasonic flaw detection, thickness measurement, ranging, medical diagnosis and imaging.
(2) Ultrasonic treatment
Ultrasonic wave refers to vibration frequency more than 20000Hz above, its vibration frequency (frequency) per second is very high, beyond the general upper limit of human ear hearing (20000Hz), people will be called the audible sound wave ultrasound
Ultrasonic is a frequency higher than 20000 Hertz of sound waves, its directivity is good, penetrating ability is strong, easy to obtain more concentrated sound energy, in the water propagation distance is far, can be used for ranging, speed measurement, cleaning, welding, gravel, sterilization and so on. It has many applications in medicine, industry and agriculture
Ultrasonic wave belongs to the sound wave, its propagation velocity and the ordinary sound propagation velocity is the same (only contains the energy is higher, penetrability is strong, the direction is single); Propagation speed depends on the propagation medium and temperature; It travels at a speed of 340m/s in an air of 15 ° C, and the higher the temperature, the higher the speed
In general, it travels fastest in solids, second in liquids, and slowest in gases
Ultrasound and ultrasound are the same, but the name is different, the essence is the same thing
Ultrasound is a high frequency
Hospital uses ultrasound to diagnose disease (B-mode ultrasound)
Ultrasound is widely used in the fields of medicine, engineering and biology
Ultrasonic vibration frequency is more than 20000Hz
Ultrasonic wave is a sound wave with a frequency higher than 20,000 Hertz
Ultrasonic wave is the propagation form of mechanical vibration state (or energy) of object.
The so-called vibration refers to the matter of the particle near its equilibrium position in the back and forth motion