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1. The introduction of ultrasonic flowmeter is concise and easy to understand.
The pipe section ultrasonic flowmeter is an instrument that measures the liquid flow inside a circular tube based on the principle of "velocity difference method". It adopts advanced multi pulse technology, signal digital processing technology, and error correction technology, making flow meters more adaptable to the environment of industrial sites, and measuring more conveniently, economically, and accurately. Below, we will introduce the relevant characteristics of ultrasonic flow meters for your reference.
1. Introduction
1. Definition: Ultrasonic flowmeter is an instrument that measures flow by detecting the effect of fluid flow on ultrasonic beams (or ultrasonic pulses).
. 2. Principle: According to the principle of signal detection, ultrasonic flowmeters can be divided into propagation velocity difference method (direct time difference method, time difference method, phase difference method, and frequency difference method), beam offset method, Doppler method, cross-correlation method, spatial filtering method, and noise method. Ultrasonic flowmeter, like ultrasonic flowmeter, is an unobstructed flowmeter due to the absence of any obstruction in the instrument flow channel. It is a type of flowmeter suitable for solving the difficulty of flow measurement, especially in large-diameter flow measurement, and has outstanding advantages. It is one of the rapidly developing types of flowmeters. The ultrasonic flowmeter adopts the principle of time difference measurement: a probe emits a signal that passes through the pipe wall, medium, and the other side of the pipe wall, and is received by another probe. At the same time, the second probe also emits a signal that is received by the first probe. Due to the influence of the medium flow velocity, there is a time difference Δ t between the two. According to the calculation, the conversion relationship between the flow velocity V and the time difference Δ t can be V=(C2/2L) × Δ t, and the flow rate value Q can be obtained. Its measurement accuracy is very high, almost unaffected by various parameters of the measured medium, and can especially solve the flow measurement problems of highly corrosive, non-conductive, radioactive, and flammable and explosive media that other instruments cannot.2. Disadvantages Currently, the main disadvantages are that the temperature range of the measurable fluid is limited by the temperature resistance of the coupling material between the ultrasonic transducer aluminum and the pipeline, and the raw data of the measured fluids sound transmission velocity at high temperatures is incomplete.
. At present, it can only be used to measure fluids below 200 ℃ in China. In addition, the measurement circuit of ultrasonic flowmeter is more complicated than that of general flowmeter. This is because in general industrial metrology, the flow velocity of liquids is often a few meters per second, while the propagation speed of sound waves in liquids is about 1500m/s. The maximum change in sound velocity caused by changes in the measured fluid flow velocity (flow rate) is also on the order of 10-3 If the accuracy of measuring flow velocity is required to be 1%, the accuracy of measuring sound velocity needs to be on the order of 10-5 to 10-6. Therefore, a complete measurement circuit is necessary to achieve this, which is why ultrasonic flowmeters can only be
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