What Is The Working Blind Zone Of Ultrasonic Liquid Level Gauge?

When the object is close to the eye and the angle is fixed, but it is not clear or invisible, this range is called the blind spot. The blind area of the ultrasonic level gauge is also the same as the blind area of the human eye.
The working principle of the ultrasonic liquid level gauge is realized based on the emission and reception of ultrasonic waves. The speed of ultrasonic transmission in the air is certain. Ultrasonic waves are sent out, and then the waves reflected by the liquid surface or object surface are received, and the timing starts from the emission 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 depth of the pond or the height of the tank is certain. The actual liquid level is the depth of the pool minus the distance measured by the ultrasonic liquid 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 dead zone of the ultrasonic liquid level gauge varies according to the range. The smaller the range, the smaller the dead zone, and the larger the range, the larger the blind zone. But generally between 30cm-50cm. Therefore, the blind area must be taken into account when installing the ultrasonic liquid level gauge. In special occasions, the blind area will be required to be very small. At this time, a small blind area ultrasonic liquid level gauge can be considered, and its blind area is generally only 4-6cm. But its range is relatively small, only 0.6m. In many fields of liquid level measurement, due to the limitation of space and installation conditions, an ultrasonic liquid level gauge with a small blind zone is required.
When the liquid level of the ultrasonic liquid level gauge enters the blind zone, it will usually display the liquid level position corresponding to the secondary echo. For example, if the blind 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 a liquid level value corresponding to a space distance of 0.4m. Since the liquid surface reflects well when measuring the liquid level, after the sound pulse emitted by the ultrasonic liquid level gauge is reflected by the liquid surface, the echo will be reflected back to the liquid surface after reaching the transducer (or probe) surface, and 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 (multiple round-trip echoes) may also be received.