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Interference factors of abnormal signal of radar level gauge

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The radar level gauge calculates the time interval between transmitting and receiving electromagnetic waves by emitting electromagnetic waves to the measured medium, and then calculates the distance between the antenna and the surface of the measured medium. It can be seen that whether the radar level gauge can successfully transmit electrical signals is very important for level measurement. However, in our daily work, the signal is disturbed from time to time. So, what are the interference factors that cause the abnormal signal of the radar level gauge?

The radar level gauge calculates the time interval between transmitting and receiving electromagnetic waves by emitting electromagnetic waves to the measured medium, and then calculates the distance between the antenna and the surface of the measured medium. It can be seen that whether the radar level gauge can successfully transmit electrical signals is very important for level measurement. However, in our daily work, the signal is disturbed from time to time. So, what are the interference factors that cause the abnormal signal of the radar level gauge?

By analyzing the factors that cause the abnormal signal of the radar level gauge, it is found that there are many causes of interference, and the sources of interference are also diverse. But generally speaking, it can be divided into two categories: one is internal interference and the other is external interference.

1. External interference

1. Celestial body, sky and electricity interference

Celestial bodies refer to the sun or other stars, so the interference of celestial bodies means that the electromagnetic waves emitted by them interfere with the signals sent by the radar level gauge. However, the term "Tiandian" is generally not familiar to everyone.

The so-called sky electricity can actually be understood as the interference of electromagnetic waves generated by atmospheric ionization, lightning, or natural phenomena such as volcanoes and earthquakes on the radar level gauge signal.

2. Light interference

The interference of light mainly lies in semiconductor components. Most of the components used to control the instrument are semiconductor materials, and the conductivity of the semiconductor components will change after being affected by light, which affects the normal use of the radar level gauge.

3. Thermal interference

During the operation of a thermal power plant, its thermal equipment will generate a lot of heat, which will cause changes in the surrounding instrument and ambient temperature. This is what we call thermal interference. These interferences will affect the components of the radar level gauge, which will lead to inaccurate measurements.

4. Humidity interference

When the humidity increases, the resistance of the insulator will decrease, the number of media will increase, the frame will be loose, the resistance will increase, and then the leakage current will increase, the capacitance will increase, and the inductance will change. In addition, it will soften the colloid and reduce the measurement accuracy.

5. Mechanical interference

The so-called mechanical interference means that the radar level gauge is subject to greater vibration or impact from external machines, which causes some parts in the radar level gauge to vibrate or even shift and deform, and may also loosen the gauge head pointer and cause measurement errors. In this case, we usually use diaphragms and damping springs to reduce the impact.

6. Chemical interference

Chemical interference usually refers to some corrosive gases, such as acids and alkalis. The long-term effects of these gases will not only damage the instrument and internal components, but also conduct electricity with the metal and affect the normal operation of the radar level gauge.

2. Internal interference

The interference comes not only from the outside, but also from the inside of the radar level gauge. For example, interference caused by inductance and capacitance between electrical wires and electronic components of a power transformer. In addition, internal components can also generate noise interference. At present, most radar level gauges have been improved, using high-frequency microwave technology, which greatly improves the performance of the level gauge and reduces interference.