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1. Ultrasonic Time Difference Method
Time Difference Method is a method of calculating fluid velocity and flow rate by measuring the time difference between the forward and backward propagation of ultrasonic waves. 1. The basic principle is based on the fact that when ultrasonic waves propagate downstream and upstream in a fluid, their propagation speed will change due to the influence of fluid flow, resulting in differences in propagation time. By measuring the time difference between the forward and backward propagation of ultrasonic waves, combined with the relationship between channel length, sound velocity, and fluid flow velocity, the fluid flow velocity can be calculated, and the fluid flow rate can be obtained. 2. The calculation method assumes that the propagation velocity of ultrasonic waves in a stationary fluid is $c $, the flow velocity of the fluid is $v $, the propagation distance of ultrasonic waves is $L $, the forward propagation time is $t1 $, and the backward propagation time is $t2 $. Then $t1=\ frac {L} {c+v} $, $t2=\ frac {L} {c-v} $, time difference $\ Delta t=t2- t1 $, the relationship between flow velocity $v $and $\ Delta t $can be derived, and the flow velocity and flow rate can be finally calculated.
3. Application scenario: Industrial field: commonly used for flow measurement of fluids (such as water, petroleum, chemical raw materials, etc.) in various industrial pipelines. For example, in petrochemical enterprises, the time difference method ultrasonic flowmeter can accurately measure the flow rate of crude oil, finished oil, etc. in pipelines, providing accurate data for production process control and measurement. Water conservancy and hydropower: In water conservancy proj
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4. Advantages Non contact measurement: does not directly contact with the measured fluid, will not cause interference or pollution to the fluid, and is suitable for measuring various special fluids such as corrosive and high-purity fluids before construction.
. High measurement accuracy: Under appropriate measurement conditions, high measurement accuracy can be achieved, meeting the needs of most industrial and engineering fields. Limited measurement results are easily affected by factors such as temperature, pressure, and impurities in the fluid, and require corresponding compensation and correction. The installation conditions for pipelines have high requirements, such as the roughness of the inner wall of the pipeline and the length of the straight section of the pipeline, which can affect the measurement accuracy.2. Theoretical formula derivation of ultrasonic flowmeter
The theoretical formula derivation of ultrasonic flowmeter is based on the principle of time difference method, and the core formula is: Δ T=(2L · v · cos θ)/(c ² - v ²) ≈ (2L · v · cos θ)/c ² (when c>>v) 1 The basic principle of ultrasonic flowmeter is to calculate the flow velocity by measuring the time difference between the ultrasonic signals propagating in parallel and reverse flow in the fluid. The main methods include time difference method, Doppler method, and correlation method, among which time difference method is the most widely used.
2. Formula derivation of time difference method. Let the linear distance between