Structural principle analysis of ultrasonic level gauge

The ultrasonic level gauge is one of the indispensable level gauges for measuring the level of the tank area and the level of the sewage treatment system. Here we introduce the composition of the ultrasonic level gauge and the principle analysis of the ultrasonic level gauge. The ultrasonic sensor is mainly composed of It is composed of piezoelectric wafers, which can not only transmit ultrasonic waves, but also receive ultrasonic waves. Low-power ultrasonic probes are mostly used for detection. It has many different structures, which can be divided into straight probe (longitudinal wave), oblique probe (transverse wave), surface wave probe (surface wave), Lamb wave probe (Lamb wave), dual probe (one probe reflection, one probe reception) Wait. The core of an ultrasonic sensor is a piezoelectric wafer in its plastic or metal jacket. The materials that make up the wafer can be of many kinds. The size of the wafer, such as diameter and thickness, also varies, so the performance of each sensor is different, and we must know its performance in advance before using it. The working principle of the ultrasonic level gauge: In the ultrasonic detection technology, no matter what kind of ultrasonic instrument, the electric energy must be converted into ultrasonic waves and transmitted, and then received and converted into electrical signals. The device that completes this function is called an ultrasonic transducer, also known as ultrasonic transducer. called the probe. The top-mounted ultrasonic level gauge places the ultrasonic transducer above the liquid to be measured, and emits ultrasonic waves downward. The ultrasonic waves pass through the air medium, are reflected back when they encounter the liquid level, and are received by the transducer and converted into electricity. The electronic detection part detects this signal and turns it into a liquid level signal for display and output. The externally attached ultrasonic level gauge installs the probe (ultrasonic transducer) at the bottom of the storage tank. The ultrasonic wave passes through the bottom of the storage tank and the medium meets the air and medium junction and is reflected back, received by the probe, and converted by the transducer. for liquid level information. From the principle of ultrasonic propagation in the medium, it can be known that if the medium pressure, temperature, density, humidity and other conditions are constant, the propagation speed of ultrasonic waves in the medium is a constant. Therefore, when the time required for the ultrasonic wave to be received from the time it is transmitted to the time it encounters the reflection at the gas-liquid interface is measured, the distance traveled by the ultrasonic wave can be converted, that is, the data of the liquid level is obtained.

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