Radar level gauge: why do you want to set the electric constant

Radar level gauge: why do you want to set the dielectric constant of 1. What is the relationship between radar liquid level gauge and dielectric constant? First of all, not all radar level gauge of dielectric constant parameters. Some non-contact and single stem guided wave radar sensitivity often only option. Need for claims that can detect more interface of dielectric constant and double pole of radar level gauge, some to test the low dielectric constant of medium level meter will ask dielectric constant. The influence of the dielectric constant of the radar electromagnetic wave is reflected in two aspects, one is the medium surface to absorb electromagnetic waves ( Reflection) Rate, and the second is when electromagnetic wave through the medium wavelength ( Frequency) Can change. Fired from most pure & rarr; Reflection & rarr; The working process of the receiving, really don't need to dielectric constant. According to need to adjust the sensitivity, it can be reached from various kinds of echo detection to echo, complete the measurement. But, in some cases, eliminate unwanted echo, echo detection need, need to greatly increase the computational complexity of liquid level meter, then add a dielectric constant parameters, it is easier to get a good price. For example, the surface of the bubble will reduce the bubble level of recognition for some of the liquid surface level surface precipitation some other medium ( If the mud on the surface of the water) Because very thin gauge will take the medium surface as the liquid level below. Some medium, liquid level meter will put the tank bottom echo as liquid level signal. Also: double pole or coaxial sheath maerial of guided wave radar level meter to the difference of the interaction between the two electrodes is above the surface or medium in these cases, the rights to add a dielectric constant can greatly reduce the computational complexity, sometimes or should be, so depending on the type, purpose, structure, some radar level meter will require dielectric constant, while others require sensitivity. Radar level gauge is not according to the measured medium dielectric constant is measured. It should be said that the radar level gauge is according to the calculation of radar wave to the time used to measure the surface of the object. The dielectric constant of measured medium just decided to one of the conditions of radar reflectivity. “ Failure radar wave is an electromagnetic wave, the reflectivity of electromagnetic waves influenced by the following conditions: the reduction coefficient and is directly proportional to the square root of the electrical conductivity and magnetic permeability, and is inversely proportional to the square root of the dielectric constant. That is the target object of the dielectric constant, the greater the attenuation rate is smaller, the attenuation rate of small reflectivity is big. So large dielectric constant & hellip; Strong reflectivity - High signal intensity. In turn with dielectric constant small medium attenuation reflectance small weak signal strength so when setting if a given dielectric constant, for good measure. 2. Radar level gauge set electric constant one of the essence of the usefulness of radar is echo analysis algorithms, such as VEGA is ECHOFOX signal processing filter and the characteristic of the fuzzy logic. Is very complex, established model to a variety of existing parameters, comprehensive analysis of the relationship between each other, good collocation ZUI way, including the dielectric constant of the medium, the constant though itself although not higher than the other parameters for accuracy, but the constant quantity is difference itself may be larger, such as sulfuric acid is about 80 or so, only about 1 and acetone, which is 80 times more differences. Radar wave will be through the medium of some, reflected in the bottom, the reflected wave is a very complicated one order. To identify, to analysis and calculation. Emission intensity is important, but it's a fine job, just the enhancement of emission intensity, like a little not to move the brain into account, just use brute force, it is no good. Radar level gauge measurement and the material of dielectric constant is about different dielectric constant of reflection wave, use that can be layered measurement. Other measuring dielectric constant small medium, the surface reflection pulse energy is low, so you can't use direct reflection method to measure the liquid level, aiming at this situation, using set a short position in the tank bottom, and the length of the probe is known, microwave pulse at the speed of light in air, slowing down (in case of medium Depends on the dielectric constant of medium) When the wave back in case of short circuit position. Microwave in the air return time is known, and to calculate the microwave reflection and return time difference, the difference is proportional to the level. Radar level gauge is not all-powerful liquid level meter, for non conductive liquid dielectric constant is very small radar wave reflected signal is very weak, and was accepted by the antenna energy is smaller, if less than 1% of the energy wave transmission, will influence the accuracy of measurement, plus if there is the occurrence of the phenomenon such as liquid level fluctuation to bubble, precision is more influential. So, still need to consider the factors of medium, if want to use now can also choose a director radar, to minimize the impact guided wave radar level gauge of dielectric constant to consider, but not a very important parameter, the dielectric constant, the greater the radar reflected the stronger the signal. Short-circuit point at the tank bottom setting refers to the reflection point of microwave in the tank bottom, to prevent microwave reflection in other directions, should add with microwave vertical metal plate. This microwave short-circuit point when empty cans and a material to return time is different. This low accuracy than direct way, commonly used in the dielectric constant of 1. 8. Radar level gauge, must consider the dielectric constant of medium, generally there will be a variety of media in the product specification of dielectric constant, when the instrument Settings shall be carried out in accordance with the instruction that the dielectric constant of Settings, otherwise the meter cannot measure accurately.

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