Ultrasonic level gauge blind area

Ultrasonic level gauges have many advantages such as wide measurement range, high precision, high sensitivity, and fast response frequency, and are used in many fields. The ultrasonic level gauge will have a blind spot when it is used. The following describes the blind spot of the ultrasonic level gauge. The ultrasonic level gauge is a high-frequency pulsed sound wave sent out by an ultrasonic probe that encounters the surface of the liquid to be measured and is reflected and folded back. The reflected echo is received by the transducer and converted into an electrical signal. The propagation time of a sound wave is proportional to the distance from the sound wave to the surface of the object. The relationship between the acoustic wave transmission distance S, the sound speed C and the acoustic transmission time T can be expressed by the formula: S=C×T/2. Since the mechanical inertia during the transmission of the acoustic wave pulse occupies the transmission time, the acoustic wave in a small area close to the ultrasonic transducer is This area that cannot be received is called a dead zone. The size of the blind spot is related to the ultrasonic range. Features of the ultrasonic level gauge: 1. High measurement accuracy, the measurement accuracy of the ultrasonic level gauge reaches a few tenths of a percent, and it can resist various interference waves; 2. The product performance is stable; 3. The ultrasonic level gauge is easy to install and easy to install maintain. The ultrasonic level gauge is a non-contact instrument, which does not directly contact the liquid and has a low failure rate. At the same time, when the instrument is installed, it is not necessary to clean the tank and does not affect the normal operation of the production. It has the characteristics of high precision, long life, stable and reliable, convenient installation and maintenance, and simple reading. 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 very 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 ultrasonic level gauge emits ultrasonic pulses, it cannot detect the reflected echo at the same time. Since the transmitted ultrasonic pulse has a certain time width, and the sensor still has residual vibration after the ultrasonic wave is transmitted, the reflected echo cannot be detected during the period, so a small distance from the probe surface downward cannot be detected normally, and this distance is called the blind zone. If the highest liquid level to be measured enters the blind zone, the instrument will not be able to detect correctly, and errors will occur. If necessary, the level gauge can be installed at a height. In addition to the upper-mounted ultrasonic level gauge, there is also a type of externally-measured liquid level gauge, also known as externally-mounted liquid level gauge and externally-mounted ultrasonic level gauge. The difference from the top-mounted type is that the external measurement type is attached to the horizontal position of the tank bottom, and the liquid level is measured by using the ultrasonic wave to penetrate the tank bottom to reach the gas-liquid interface and return the echo to calculate the height of the liquid level.
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