The principle and application of radar level gauge

1. Overview Material level is an important parameter in industrial production. There are many methods of material level measurement. For different working conditions and media, different measurement principle level gauges can be used, such as air blowing method, static pressure type, float type, heavy hammer type, ultrasonic and other commonly used material level measurement instruments. , have their own characteristics and scope of application. The radar level gauge uses advanced radar measurement technology, with its excellent performance, especially in the harsh measurement conditions such as stirring, high temperature, large steam, strong medium corrosion, and easy scarring in the tank, it shows its Excellent performance plays an increasingly important role in industrial production. 2. Principle and technical performance Radar wave is a special form of electromagnetic wave. Radar material level gauge uses the special performance 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 interference 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 per unit area (magnetic flux or field strength), 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 device, signal processor, antenna, operation panel, display, fault alarm and other parts. Transmit-reflect-receive is the basic working principle of radar level gauge. 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 surface of the medium and the level of the material. 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 between radar wave transmission and reception; 2. Advanced technology for measuring material level with radar level gauge : (1) The application of new echo processing technology From the measurement principle of the radar level gauge, we can know that the radar level gauge measures the material level by processing the time when the radar wave is emitted from the probe to the surface of the medium and then returns to the probe. 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, the detection signal must be processed to eliminate noise as much as possible. After a lot of experimental verification, the data smoothing method can achieve satisfactory results. This method can also effectively overcome the influence of the agitator in the tank on the measurement. (3) Features of the radar level gauge: Since the radar level gauge adopts the above-mentioned advanced echo processing and data processing technology, coupled with the characteristics of high frequency and good penetration performance of the radar wave itself, the radar level gauge has the characteristics of Better performance than contact level gauges and similar non-contact level gauges. ①It can be measured continuously and accurately under harsh conditions. ②Simple operation and convenient debugging. ③Accurate, safe and energy saving. ④ No maintenance and high reliability. ⑤ Almost all media can be measured. 3. Problems that should be paid attention to in installation (1) When measuring liquid materials, the axis of the sensor is perpendicular to the surface of the medium; when measuring solid materials, the sensor must be inclined at a certain angle because the solid medium has a pile angle. (2) Try to avoid devices that cause false reflections within the emission angle. In particular, it is necessary to avoid obstacles in the 1/3 cone-shaped emission area closest to the antenna (because the closer the obstacle is, the stronger the false reflection signal is).

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