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Industry Information
How does the ultrasonic level gauge work and how to use it
2012-3-8 11:28:02


的使用方法超声波物位计通过发射高能超声波,使其从被测物体表面反射回来。 How to use the ultrasonic level gauge The ultrasonic level gauge emits high-energy ultrasonic waves to make it reflect back from the surface of the measured object. The reflected signal is processed by an improved algorithm, which enhances the effective signal and better discards the invalid interference signal. These high-energy sound waves ensure minimal signal loss after passing through the medium. Thanks to these high-energy sound waves, the sound wave loss is less than that of traditional ultrasonic instruments. The stronger the transmitted signal, the stronger the reflected signal. The receiver circuit can identify and monitor low-level signals even in a noisy environment.
1. Liquid-medicated measurement method. The probe fixing device is at the lowest level in the liquid. The ultrasonic pulses announced by the probe are transmitted from the probe to the liquid surface in the liquid, and then reflected back from the liquid surface to the unified probe and accepted. With this measurement method, the temperature of the liquid is not required to change much, and there are fewer elements in the medium that affect the transmission of ultrasonic waves. Otherwise, the change in the transmission speed of ultrasonic waves in the liquid will have a greater impact on the measurement results.
2. It is a gas-based measurement method. The probe device is in the gas above the highest liquid level. Under this method, the accuracy of the liquid level measurement is greatly affected by the transmission speed of ultrasonic waves in the gas. Under ordinary circumstances, you only need to agree with the premise of the device. This method is better, which is helpful for debugging and maintenance.
3, solid-media measurement method, a sound transmission solid rod or tube is pierced into the liquid, the upper end should exceed the highest liquid level, the probe device is on the upper end of the sound transmission solid, the formula H = vt / 2 is still used, but v Represents the speed of sound in a solid.
The measurement methods described in 1, 2, and 3 belong to the single probe method and method, that is, the probe emits pulse sound waves, and then accepts them after transmitting and reflecting. Because the pulse needs to continue for a period of time during transmission, the echo and transmission wave placed in this period are not easy to distinguish. The interval corresponding to this period of time is called the measurement blind zone. When the head is installed, the interval above the highest liquid level should be greater than the interval between the blind spots.
的接纳与发射由两探头自力完成,可以使盲区大为减小,这在某些装置地位较小的非凡场所是很便利的。 There is still a dual-probe method for receiving and transmitting . The acceptance and emission of the ultrasonic level gauge is completed by the two probes on their own, which can greatly reduce the blind zone, which is very convenient in some extraordinary places where the status of the device is relatively small.
How ultrasonic level gauges work
Everyone knows that in the detection and control of industrial production equipment, it is very helpful to know the working principle of the required instruments and meters. It is very helpful to select the appropriate measurement and adjustment instruments. In the current level measurement control of industrial and mining enterprises, in addition to the selection of various floating Ultrasonic level gauges are often used outside of measuring instruments such as ball level gauges, pressure transmitters and differential pressure transmitters, so how does it work? Generally speaking, we call sound waves with a sound wave frequency exceeding 20kHz as ultrasound Ultrasonic wave is a kind of mechanical wave, that is, a kind of propagation process of mechanical vibration in elastic medium. It is characterized by high frequency, short wavelength, small diffraction phenomenon, and good directivity, which can be ray and directional propagation. Ultrasonic waves have very low attenuation in liquids and solids, and therefore have strong penetrability. Especially in solids that are opaque to light, ultrasonic waves can penetrate tens of meters in length, and there will be significant reflection when they encounter impurities or interfaces. The bit meter works by using this principle. In the ultrasonic detection technology, no matter what kind of ultrasonic instrument, the electric energy must be converted into an ultrasonic wave and then transmitted back to be converted into an electrical signal. The device that accomplishes this function is called an ultrasonic transducer, which is also called a probe. 计在该介质中传播速度是一个常数。 The ultrasonic transducer is placed above the liquid or level to be measured, and the ultrasonic wave is transmitted downward. The ultrasonic wave passes through the air medium, is reflected back when it encounters the water surface or the object interface, and is then received by the transducer and converted into an electrical signal. The electronic detection part detects this signal and turns it into a level signal for display and outputs a standard signal for use by other instruments or control devices. From the principle of ultrasonic wave propagation in the medium, it can be known that if the medium pressure, temperature, density, humidity If the conditions are constant, the propagation speed of the ultrasonic level gauge in the medium is a constant. Therefore, when the time required for the ultrasonic wave to be received from the reflection of the object or liquid surface is measured, the distance the ultrasonic wave can pass through can be converted, and the level or liquid level data can be measured indirectly.