Flat radar water level gauge, radar liquid level gauge manufacturer. Prices are more favorable here

Description :

　　Distance measurement principle of radar level gauge

　　The radar level gauge emits modulated electromagnetic waves to the liquid surface, and the reflected echo signal from the liquid surface is received by the radar and mixed with the transmitted signal. The frequency of the resulting difference frequency signal is proportional to the distance from the liquid surface. A high-precision signal processing algorithm combining Zoom FFT and energy center of gravity correction algorithm is proposed for the application of millimeter wave radar level gauges. Zoom FFT is used for spectral refinement with a small refinement factor, and the energy center of gravity correction algorithm is used to accurately estimate the frequency of the difference frequency signal. This algorithm eliminates the influence of FFT fence effect on ranging accuracy, and the computational complexity and storage space are relatively reasonable The simulation results show that when the signal-to-noise ratio of the difference frequency signal is 12dB, the algorithm controls the root mean square error of the distance measurement to the millimeter level.

　　The radar level gauge emits extremely short microwave pulses with low energy, which are transmitted and received through an antenna system. Radar waves travel at the speed of light. The running time can be converted into level signals through electronic components. A special time extension method can ensure stable and accurate measurements in a very short period of time.

　　Even in complex working conditions where false echoes exist, new microprocessing techniques and debugging software can accurately analyze the echoes of the material level.

　　Two key factors for selecting radar level gauges correctly

　　The correct stacking type of radar level gauge is necessary to ensure better use of the radar level gauge. What type of radar level gauge should be selected based on the physical and chemical properties of the measured fluid medium? Make the diameter, flow range, lining material, electrode material, and output current of the radar level gauge suitable for the properties of the target fluid and the requirements of flow measurement.

　　1. Precision functional inspection

　　The accuracy level and function of the instrument are iteratively selected based on measurement requirements and usage scenarios to achieve cost-effectiveness. For example, in situations such as trade settlement, product handover, and energy measurement, a higher accuracy level should be selected, such as 1.0, 0.5, or higher. In situations such as process control, different accuracy levels should be selected according to control requirements. For some sites that only check process flow and do not require control and measurement, a slightly lower accuracy level, such as 1.5 or 2, can be selected At level 5 or even 4.0, low-cost plug-in radar level gauges can be used repeatedly.

　　2. Measurable medium

　　When measuring medium flow rate, instrument range, and caliber for general medium measurement, the full-scale flow rate of the radar level gauge can be selected within the range of 0.5-12m/s for measuring medium flow rate, which is relatively wide. The selection of instrument specifications (caliber) may not necessarily be the same as the process pipeline. It should be determined based on the flow rate range of S within the flow rate range. That is, when the pipeline flow rate is too low to meet the requirements of the flow instrument or the measurement accuracy cannot be guaranteed at this flow rate, the instrument port diameter should be reduced to increase the flow rate inside the pipeline, and satisfactory results should be obtained.

　　Measurement method of radar water level gauge

　　It is a radar level gauge based on the Time Domain Reflectance (TDR) principle. Some pulses of the radar level gauge are reflected to form echoes and return along the same path. However, considering the effects of corrosion and adhesion, the final value of the measurement range should be at least 100mm away from the antenna. For overflow protection, a safe distance of the radar level gauge can be defined to be added to the blind spot. The small measurement range is related to the antenna. With different concentrations, foam can both absorb microwave and reflect it, but it can be measured under certain conditions. Return to the pulse transmission device.

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