The principle and advantages and disadvantages of radar level gauge

The commonly used types of radar level gauges are pulse radar level gauges and guided wave radar level gauges. The introduction of the following two radar level gauges: 1: Pulse radar level gauge Pulse radar uses high frequency and narrow pulses to modulate the microwave source signal, and emits pulse waves of fixed frequency (ie carrier frequency) in the form of beams. After the surface is reflected and received by the receiver, the time travel of the pulse determines the distance from the transmitting antenna to the surface of the medium. Advantages: 1. The measurable distance is large; 2. It has a wide range of applications, and can be widely used in oil storage tank fields, asphalt storage tanks, petroleum liquefied gas, petrochemical industry sewage tanks, and blast furnace molten steel in the steel industry; 3. Integration Structure, non-contact horn; Disadvantages: 1. Most economical pulsed microwave level meters use microwave frequencies of 5.8GHz or 6.3GHz, and their radiation angle is large (about 30°), which is easy to penetrate the container wall or internal components. generate interference echoes. Although increasing the size of the horn antenna can slightly reduce the launch angle, the volume increases and it is inconvenient to use; 2. When the liquid level fluctuates and foams, the situation becomes more complicated, and the signal scatters out of the propagation path or absorbs most of the energy, thus Make the signal returning to the receiving antenna of the radar level gauge weaker or return no signal; 3. When there are obstacles such as agitators and pipes in the storage tank, these obstacles will also reflect electromagnetic wave signals, thereby generating false liquid level signals . Two: Guided wave radar level gauge The working principle of the guided wave radar is very similar to the conventional radar that propagates electromagnetic waves through space. The basis of the guided wave radar level gauge is the time domain reflection principle of electromagnetic waves. Using this principle, buried cables and When the broken end of the cable is buried in the wall, when the broken end of the cable is measured, the electromagnetic pulse signal sent by the TDR generator propagates along the cable. When the broken end is encountered, the measurement reflected pulse will be generated. At the same time, the change of impedance preset in the receiver corresponding to the total length of the cable also triggers a basic pulse, and the position of the broken end can be accurately measured by comparing the reflected pulse with the basic pulse. Advantages: 1. It has a strong ability to suppress steam and foam, and the measurement is not affected; 2. It is not affected by the density of liquid, the degree of porosity of solid materials, temperature, and dust during feeding; 3. Low maintenance, high performance, High precision, high reliability and long service life. Disadvantages: Guided wave radar level gauges are contact radars and cannot be used in corrosive or flammable and explosive liquid scenarios.

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