What are the main differences between radar level gauges and ultrasonic level gauges?

The main difference between ultrasonic level gauge and radar level gauge

Acoustic waves are mechanical waves that are reflected at the interface of large density (gas-liquid-solid) changes, and the propagation depends on the medium, temperature, and pressure.

The impact is large, and temperature compensation should be introduced. High temperature or pressure measurement is generally not applicable. First of all, the ultrasonic level gauge has a temperature limit. Generally, the temperature of the probe cannot exceed 80 degrees, and the sound wave velocity is greatly affected by the temperature. Secondly, the ultrasonic level gauge is greatly affected by the pressure, and generally it is within 0.3 MPa, because the ultrasonic wave is emitted by the vibration of the piezoelectric substance, and the sounding component is affected when the pressure is too large. Third, when the fog or dust in the measurement environment is large, it will not be measured well.

The radar probe emits high frequency pulses and propagates along the cable. When the pulse encounters the surface of the material, it is reflected back and received by the receiver in the meter, and the distance signal is converted into a level signal. The electromagnetic wave is used as the detection signal, and the interface is reflected at the interface where the dielectric constant changes. The electromagnetic wave can propagate in the vacuum and is basically not affected by temperature and pressure changes, so it can be used in high temperature and high voltage applications. Not suitable for measurements on very low dielectric constant media.

The radar is electromagnetic wave, which is not affected by the degree of vacuum. It has a wide range of application to the temperature and pressure of the medium. With the advent of high-frequency radar, its application range is more extensive, so in the level measurement, the radar is a very good one. s Choice.

Other difference performance

1. The radar measurement range is much larger than the ultrasonic wave. The radar launch angle is larger than that of ultrasonic waves. Non-contact radar is not recommended in small containers or elongated containers. Generally, guided wave radar is recommended.

2. The radar has horn type, rod type and cable type, and the relative ultrasonic wave can be applied to more complicated working conditions.

3. Ultrasonic precision is not as good as radar. It is definitely used in high-precision radar on the storage tank, and ultrasonic waves are not selected.

4. The relative price of the radar is higher. Under normal circumstances, the ultrasonic wave is lower than the radar. Of course, the price of some large-range ultrasonic waves is also very high, such as the range of 6 to 70 meters. At this time, the radar can not reach, and only the ultrasonic wave can be selected!

5. When using radar, consider the dielectric constant of the medium.

6. Ultrasonic waves should not be used in vacuum, steam content is too high or there is foam in the liquid surface.

Related terms in this article explain ultrasound

Ultrasound We know that when an object vibrates, it makes a sound. Scientists refer to the number of vibrations per second as the frequency of the sound, and its unit is Hertz. The frequency of sound waves that we can hear in human ears is 20 to 20,000 Hz. When the vibration frequency of the sound wave is greater than 20,000 Hz or less than 20 Hz, we will not hear it. Therefore, we call sound waves with frequencies above 20,000 Hz "ultrasonics". The ultrasonic frequency commonly used for medical diagnosis is 1 to 5 MHz. Ultrasonic waves have good directionality, strong penetrating ability, easy to obtain more concentrated sound energy, and far-reaching distance in water. Can be used for ranging, speed measurement, cleaning, welding, gravel, etc. There are many applications in medicine, military, industry, and agriculture. Theoretical studies have shown that under the same amplitude, the energy of an object's vibration is proportional to the vibration frequency. When the ultrasonic wave propagates through the medium, the frequency of the medium particle vibration is high. Therefore, the energy is very large. In the dry winter in northern China, if the ultrasonic wave is introduced into the water tank, the severe vibration will break the water in the tank into many small droplets, and then blow the mist into the room with a small fan, which can increase Indoor air humidity. This is the principle of the ultrasonic humidifier, pharyngitis, bronchitis and other diseases, calling for a hundred years of jin, it is difficult for blood flow to reach the diseased part. By using the principle of the humidifier, the liquid medicine is atomized and the patient is inhaled, which can improve the curative effect. The use of the enormous energy of the ultrasonic wave can also cause the stone in the human body to be broken and violently vibrated, thereby slowing down the pain and achieving the purpose of healing.

radar

The appearance of radar screen radars was due to the fact that during the war between Britain and Germany during World War II, the United Kingdom urgently needed a radar (technique) capable of detecting metal objects in the air to help search for German aircraft in anti-air strikes. During the Second World War, the radar has already appeared on the ground-to-air, air-to-ground (search) bombing, air-to-air (intercept) fire control, and the identification of the enemy and the enemy. After World War II, the radar developed single-pulse angle tracking, pulsed Doppler signal processing, high resolution of synthetic aperture and pulse compression, combined system combining enemy and enemy identification, automatic fire control system combined with computer, terrain avoidance and terrain following, no New radar systems such as source or active phase arrays, frequency agility, multi-target detection and tracking. Later, with the advancement of science in various fields such as microelectronics, the continuous development of radar technology, its content and research content are constantly expanding. Radar detection methods have been developed from the previous radar-only detector to infrared light, ultraviolet light, laser and other optical detection means. There is also a mentally induced radar that responds to human brain waves and perceives signs of life. Early Radar Contemporary radar's simultaneous multi-function capability allows battlefield commanders to scan targets in a variety of different search/tracking modes and automatically correct for interference errors, and most of the control functions are done internally. Automatic target recognition can make the weapon system work to the maximum. The integrated radar system with airborne enemy and JSTARS with the ability to identify the battlefield enemy and the enemy has actually become the information command center in the future battlefield.

Level gauge

The level of the liquid medium in the container is called the liquid level, and the meter for measuring the liquid level is called the level gauge. The level gauge is a type of level meter. Magnetic float level gauge, also known as magnetic flap level gauge, magnetic flip level gauge, magnetic float level gauge.

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