The difference between ultrasonic level meter and radar level meter
In the process of use, we generally call the sound wave with a frequency of more than 20kHz ultrasonic wave, ultrasonic wave is a kind of mechanical wave, that is, mechanical vibration in the elastic medium in a propagation process, it is characterized by high frequency, short wavelength, small diffraction phenomenon, and good directivity, can become a ray and directional propagation.
Ultrasonic attenuation in liquids and solids is very small, so the penetration ability is strong, especially in the light opaque solids, ultrasonic can penetrate tens of meters in length, encounter impurities or interfaces will have significant reflection, ultrasonic level meter is the use of its this feature.
In ultrasonic detection technology, no matter what kind of ultrasonic instrument, it is necessary to convert electrical energy into ultrasonic emission, and then receive back into electrical signals, and the device to complete this function is called ultrasonic transducer, also known as the probe. The ultrasonic transducer is placed above the measured liquid, and the ultrasonic wave is emitted downwards. The ultrasonic wave passes through the air medium, is reflected back when it meets the water surface, and is received by the transducer and converted into an electrical signal. The electronic detection part detects this signal and turns it into a liquid level signal for display and output.
According to the principle of ultrasonic propagation in the medium, if the medium pressure, temperature, density, humidity and other conditions are certain, the ultrasonic propagation speed in the medium is a constant. Therefore, when the time required for the ultrasonic wave to be received from the emission to the liquid surface reflection is measured, the distance through which the ultrasonic wave passes can be converted to obtain the liquid level data.
The ultrasonic wave has a blind area, and the distance between the sensor installation position and the measuring liquid must be calculated when installing the ultrasonic level meter.
