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Measuring Principle of Guided Wave Radar Level Meter
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Measuring Principle of Guided Wave Radar Level Meter

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[Abstract]:
Guided wave radar level meter measurement principle Guided wave radar is a measuring instrument based on the principle of time travel. Radar wave runs at the speed of light, and running time can be converted into level signal through electronic components. The probe sends out high frequency pulses and propagates along the cable. When the pulses meet the surface of the material, they are reflected back and received by the receiver in the instrument, and the distance signal is converted into the level signal.

Guided wave radar level meter measurement principle Guided wave radar is a measuring instrument based on the principle of time travel. Radar wave runs at the speed of light, and running time can be converted into level signal through electronic components. The probe sends out high frequency pulses and propagates along the cable. When the pulses meet the surface of the material, they are reflected back and received by the receiver in the instrument, and the distance signal is converted into the level signal.

 

Input
 
 
The reflected pulse signal is transmitted along the cable to the electronic circuit part of the instrument. The microprocessor processes the signal and identifies the echo generated by the microwave pulse on the surface of the material. The correct recognition of echo signal is accomplished by intelligent software. The distance D from the material surface is proportional to the time travel T of the pulse.
 
D=C×T/2
 
C is the speed of light.
 
Because the distance E of empty tank is known, the level L is:
 
L=E-D
 
 
Output
 
By inputting empty tank height E (= zero), full tank height F (= full range) and some application parameters, the application parameters will automatically make the instrument adapt to the measurement environment. It corresponds to 4-20mA output.