Radar level meter can perform non-contact level measurement under any process conditions. It reflects microwave signals from above to the medium, and the surface of the medium reflects it again. Based on the received signal, the level meter can measure the distance between the medium and calculate the accurate level.
Whether the medium you need to measure is liquid, solid, high temperature, low temperature, or corrosive, radar level meter can meet all your applications.
This article will take you to familiarize yourself with the terms you often encounter for powder silo radar level sensor, or fuel level sensor with 0-30m range.
1. Dielectric constant
The dielectric constant refers to the ratio of the capacitance when the same substance is used as the dielectric and vacuum in the same container, which is used to measure the ability of the substance to hold a charge.
The dielectric constant is crucial to measuring the type and properties of the material. Different materials have different dielectric constants due to different molecular structures and compositions. Generally speaking, the higher the dielectric constant, the stronger the response of the material to the electric field, while the lower the dielectric constant, the weaker the response of the material to the electric field.
2. Working frequency
The working frequency of the radar level meter refers to the frequency range of the radar waves it sends. Radar level meters can be divided into high-frequency radar and low-frequency radar according to the transmission frequency of the radar wave. The transmission frequency of low-frequency radar is between 100MHz and 8GHz, and radars above 8GHz are classified as high-frequency radar level meters.
In actual engineering, low-frequency radar level meters are mainly used to measure liquid media and small-range environments, while high-frequency radars have a larger range due to their high energy and other advantages, and can be applied to more working conditions. The radar waves of high-frequency radar level meters are better than low-frequency radars for measuring irregular surface materials such as solid materials, powders and particles.
The working frequency has an important impact on the performance and application of radar level meters, which is specifically manifested as follows:
·Penetration ability: The higher the working frequency, the worse the penetration ability of radar waves. However, high-frequency radar waves will be greatly attenuated when passing through liquids or solid materials. Therefore, in some cases, low-frequency radar level meters may be more suitable for measuring denser materials.
·Measurement accuracy: High-frequency radar waves have shorter wavelengths, so they can provide higher measurement accuracy. In contrast, low-frequency radar waves may be more susceptible to more interference, thus affecting the accuracy of measurement.
3. Blind Zone
The blind zone of a radar level meter refers to an area where radar waves cannot accurately measure, usually near the radar antenna. The blind zone is caused by the physical structure of the radar and the signal propagation characteristics. Specifically, it is impossible to accurately detect the position of the target or measured object within a certain distance. The accuracy of the measurement data can only be guaranteed after leaving this distance.
Blind zones may be caused by many reasons such as geographical conditions, electromagnetic wave propagation characteristics, target speed and the radar itself. Blind zones have a significant impact on the measurement accuracy of radar level meters. Therefore, it is very important to choose products with smaller blind zones when selecting.
Keywords：
- non invasive ultrasonic level meter
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- radar level sensor for sewage