The principle and technical performance of radar level gauge

The principle and technical performance of radar level gauge Radar wave is a special type of electromagnetic wave. Radar level gauge uses the special function of electromagnetic wave to detect material level. The physical characteristics of electromagnetic waves are similar to those of visible light, and their propagation speed is equivalent to the speed of light. Its frequency is 300MHz-3000GHz. Electromagnetic waves can penetrate interfering sources such as space steam and dust, and are easily reflected when encountering obstacles. The better the conductivity of the measured medium or the greater the dielectric constant, the better the reflection effect of the echo signal. The higher the frequency of the radar wave, the smaller the launch angle, the greater the energy (magnetic flux or field strength) per unit area, the smaller the attenuation of the wave, and the better the measurement effect of the radar level gauge. 1. The basic principle of radar level gauge The composition of radar level gauge: it is mainly composed of transmitting and receiving equipment, signal processor, antenna, operation panel, display, fault alarm and other parts. Launch-reflection-reception is the basic principle of radar level gauge operation. The antenna of the radar sensor emits a minimum 5.8 GHz radar signal in the form of a beam. The reflected signal is still received by the antenna, and the running time of the radar pulse signal from transmission to reception is proportional to the distance from the sensor to the medium surface and the material level. That is: h= H–vt/2 where h is the material level; H is the tank height; v is the radar wave velocity; t is the interval time from the radar wave launch to reception; 2. The leading technology of the radar level gauge to measure the material level : (1) The application of new echo processing technology can be known from the measurement principle of radar level gauge. There are many interference signals mixed in the reflected signal, so the processing of the real echo and the identification technology of various false echoes become the key factors for the accurate measurement of the radar level gauge. (2) Measurement data processing: Due to the influence of factors such as liquid level fluctuation and random noise, there must be a lot of noise mixed in the detection signal. In order to improve the accuracy of detection, it is necessary to process the detection signal to eliminate noise as much as possible. Through a lot of experimental verification, the selection of data smoothing method can achieve a satisfactory effect. This method can also effectively overcome the influence of the agitator in the tank on the measurement. (3) Features of the radar level gauge: Because the radar level gauge adopts the above-mentioned leading echo processing and data processing technology, coupled with the characteristics of high frequency and good penetration of the radar wave itself, the radar level gauge has the characteristics of It has more excellent functions than touch-type level gauges and similar non-touch level gauges. ①It can be measured continuously and accurately under harsh conditions. ②Simple operation and convenient debugging. ③Precise, safe and energy saving. ④ No maintenance and high reliability. ⑤Almost all media can be measured.

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