The working blind spot of ultrasonic level gauge

Why does the ultrasonic level gauge have a blind spot? How ultrasonic level gauges overcome blind spots. The popular explanation of the blind spot of the ultrasonic level gauge is like the blind spot of the human eye. When the object is close to the eye and the angle is certain, it is not clear or invisible. This range is called the blind spot. The working principle of the ultrasonic level gauge is based on the transmission and reception of ultrasonic waves. The speed of ultrasonic transmission in the air is fixed. The ultrasonic wave is emitted, and then the wave reflected from the liquid surface is received. The timing starts from the launch and ends when the echo is received. The time for the ultrasonic wave to travel in the air is fixed. Because it is a round trip, the actual distance is half of the distance. The height of the tank is fixed. 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 material level. Thus, ultrasonic measurement of liquid level or material level is realized. The blind zone of the ultrasonic level gauge is different according to the different ranges. If the range is small, the blind zone is small; if the range is large, the blind zone is large. But generally between 30cm-50cm. Therefore, the blind area must be taken into account when installing the ultrasonic level gauge. In special occasions, the blind area will be required to be very small. At this time, a small blind area ultrasonic level gauge can be considered. The blind area is generally only 4-6cm. But its range is also relatively small, only 0.6m. In many liquid level measurement fields, due to space constraints and installation conditions, ultrasonic level gauges with small blind zones are required. When the liquid level of the ultrasonic liquid level gauge enters the blind area, the liquid level position corresponding to the secondary echo is usually displayed. For example, if the dead zone is 0.3m, and the distance from the liquid surface to the transducer (or probe) surface is 0.2m, the liquid level gauge will display the liquid level value corresponding to a spatial distance of 0.4m. Since the liquid level is well reflected when measuring the liquid level, the sound pulses emitted by the ultrasonic level gauge will be reflected back to the liquid surface after they are reflected by the liquid level and reach the surface of the transducer (or probe). It is reflected back to the transducer again and received, and the echo at this time is the secondary echo. If the reflection conditions are good, multiple echoes (echoes with multiple round trips) may also be received.
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