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What is the working dead zone of the ultrasonic level gauge?
What is the working dead zone of the ultrasonic level gauge? When the object is close to the eye and the angle is fixed, it is not clear or invisible. In this range, it is called the blind zone. The blind spot of the ultrasonic level gauge is also like the blind spot of the human eye.
The working principle of the ultrasonic level gauge is based on the transmission and reception of ultrasonic waves. The speed at which the ultrasonic wave travels in the air is constant. The ultrasonic wave is emitted and then receives the wave reflected from the liquid surface or the object surface, from the start of the emission to the end of the reception of the echo. The time it takes for ultrasound to travel in the air is fixed. Because it is a round trip, the actual distance is half the distance. The depth of the pool or the height of the tank is constant. The actual liquid level is the depth of the pool minus the distance measured by the ultrasonic level gauge, which is the height of the liquid level or level. As a result, ultrasonic measurement of the liquid level or level is achieved.
The blind zone of the ultrasonic level gauge differs depending on the range and the blind zone. If the range is small, the blind zone is small and the range is large, and the blind zone is large. But generally it is between 30cm-50cm. Therefore, the blind zone must be considered when installing the ultrasonic level gauge. In special occasions, the blind zone will be required to be small. At this time, the small blind zone ultrasonic level gauge can be considered, and the blind zone is generally only 4-6 cm. However, its range is relatively small, only 0.6m. In many areas of liquid level measurement, because of space constraints and installation conditions, ultrasonic level gauges with small dead zones are required.
The level of the ultrasonic level gauge enters the blind zone and usually shows the position of the liquid level corresponding to the secondary echo. For example, if the dead zone is 0.3 m and the distance from the liquid level to the surface of the transducer (or probe) is 0.2 m, the level gauge will display a level value corresponding to a spatial distance of 0.4 m. Since the liquid level reflection is good when the liquid level is measured, the sound pulse emitted by the ultrasonic level gauge is reflected by the liquid surface, and the echo arrives at the surface of the transducer (or probe) and is then reflected back to the liquid surface. It is reflected back to the transducer and received again. The echo at this time is the second echo. If the reflection conditions are good, multiple echoes (multiple round-trip echoes) may be received.
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