Radar level gauge

Abstract

A radar level meter includes an electronic component, a housing seat, a lower cover, an upper sleeve, a support base, a wave guide head inner rod, sealing rubber, a wave guide housing, a wave guide head top cover, a housing upper cover, a transparent window, a transparent window pressing ring, a cable sealing sleeve and an O-shaped sealing ring; the wave guide head inner rod is supported by a polysulfone support base arranged on the inner wall of the wave guide head housing, and then can be supported and fixed stably; combination of the sealing rubber and the O-shaped sealing ring can effectively ensure the sealing effect of the electronic component; the upper sleeve and the lower cover are made of polyether-ether-ketone material which can enhance the high pressure resistant feature of the radar level meter at the high temperature; time domains and frequency domains can be locally analyzed through the wavelet transform technique which is suitable for a fluctuation feature of echo signal transition during feeding or discharging of a storage tank to be measured, and then interference can be eliminated, a target reflection wave can be displayed in a maximum resolution ratio.

Description

Technical field [0001] The present invention relates to the technical field of oil exploitation, in particular to a radar level gauge used for mud storage tanks of oil platform drilling rigs. Background technique [0002] In the oil platform modular drilling rig, in order to meet the drilling needs, the detection of mud storage tanks is particularly important. Because the composition and state of the mud medium are more complex, it contains particles, high viscosity, dangerous gases, and corrosive properties. The position measuring instrument puts forward strict requirements. The traditional direct contact liquid level instrument can no longer meet the requirements of the working conditions. If the detection instrument is aging and damaged severely, it will rely on manual gauges for measurement, which requires a lot of labor, plus the usual weather in the oil field. In severe weather, there are more windy and sandy weather on oil platforms on land, and the temperature is often lo...

AI Technical Summary

Problems solved by technology

However, the existing radar level gauges have problems such as large external dimensions, unstable fixed support of the waveguide antenna, poor sealing effect of electronic components, and the PTFE used in the transmitting core cannot withstand pressure at high temperatures.

[0004] In addition, the current radar level gauge usually uses Fourier transform (FFT) to find the difference frequency between the reflected wave and the transmitted wave, so as to calculate the height, but the transient echo signal fluctuates when the tank is fed and discharged. Seriously, to achieve a higher level of resolution, a very wide sweep bandwidth is required, and the discrete spectrum peak value obtained directly from FFT cannot meet the requirements of high-precision measurement, thus requiring a correction method to improve the accuracy, which obviously adds a lot of calculation to the system burden, which seriously affects the stability of the

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