Doppler flowmeter wholesale | What is a Doppler flowmeter

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1. Flow measurement principle of Doppler ultrasonic flowmeter

The Doppler ultrasonic flowmeter calculates the flow velocity by detecting the Doppler frequency shift generated by the reflection of ultrasonic waves from solid particles in the fluid, and then combines it with the water passage area to obtain the flow rate. Its core collision detection principle is based on the mathematical relationship between the Doppler effect and fluid mechanics parameters.

1. Basic principle of Doppler effect Doppler effect refers to the frequency change of the received sound wave when there is relative motion between the sound source and the receiver: the relative distance decreases: the receiving frequency is higher than the transmitting frequency (such as the alarm sound becoming sharper when a police car approaches).

. Relative distance increase: The receiving frequency is lower than the transmitting frequency (such as when the alarm sound becomes low when the police car moves away). This effect exists in fields such as sound waves and light waves, and ultrasonic flowmeters use the propagation characteristics of sound waves in fluids to achieve measurements. Figure: SCJ-LL01 Doppler flowmeter (suitable for measuring fluids containing solid particles)

2. Measurement principle of Doppler ultrasonic flowmeter: Sound wave emission and reflection. The ultrasonic transmitter serves as a fixed sound source and emits ultrasonic waves of a specific frequency (f) into the fluid. Solid particles in the fluid (such as impurities in sewage) act as "reflectors" to reflect incident ultrasonic waves back to the receiver. Due to the movement of particles with the fluid, the reflected wave frequency is shifted (fd) due to t

he Doppler effect, and the offset is directly related to the fluid velocity. The relationship between the Doppler frequency shift formula and the flow velocity (V) is described by the following formula: fd=(2f/c) × V × cos θ fd: the frequency difference between the received wave and the transmitted wave (Doppler frequency shift). f: Ultrasonic emission frequency. c: The propagation speed of ultrasound in a medium is affected by fluid temperature and pressure. θ: The angle between the direction of ultrasound incidence and the direction of water flow (avoid perpendicular incidence to prevent fd from being zero). V: Fluid flow velocity (indirectly obtained by measuring fd). Flow velocity calculation and flow derivation flow velocity (V): By deforming the formula, V=(fd × c)/(2f × cos θ) can be obtained. Instantaneous flow rate (Q): calculated based on the water area (S), with the formula Q=V × S. S: calculated using geometric formulas based on the fluid cross-sectional shape (such as circular or rectangular) and water depth. For example, the water passing area of a circular cross-section S=π× (D/2) 2 (where D is the pipe diameter).

III. Technical Features and Application Scenarios Core Advantages Anti impurity Interference: Relying on solid particle reflection sound waves, no clear fluid is required, suitable for media containing suspended solids and bubbles.

. Non invasive measurement: The ultrasonic probe can be externally attached or inserted into the pipeline to reduce interference with the fluid. Fast dynamic response: Real time monitoring of flow rate changes, suitable for fluids with large fluctuations (such as sewage discharge). Typical application of urban sewage pipelines: measuring the flow rate of sewa

Doppler flowmeter wholesale | What is a Doppler flowmeter

1. Flow measurement principle of Doppler ultrasonic flowmeter

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