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『Time difference ultrasonic flowmeter』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)
1. Ultrasonic Time Difference Algorithm
The ultrasonic time difference algorithm is based on the principle of time difference ultrasonic flowmeter, which calculates the flow velocity and flow rate by measuring the time difference between the propagation of ultrasonic waves in the fluid in both forward and backward directions. Flow velocity calculation: Ultrasonic sensors emit ultrasonic waves into the fluid. When the ultrasonic waves propagate in the flowing liquid, the propagation speed in the downstream direction will increase, while the propagation speed in the upstream direction will decrease. By measuring the time difference between the propagation of ultrasonic waves in the upstream and downstream directions with high precision, the flow velocity of the fluid can be calculated. The key formula is: assuming that the propagation speed of ultrasound in a stationary fluid is c, the fluid flow velocity is v, the transducer spacing is L, and the angle between the sound path and the pipeline is θ, then the forward flow time t1=L/(c+vcos θ), and the backward flow time t2=L/(c-vcos θ). The time difference Δ t=t2-t1 ≈ 2Lfcos θ/c ² can be used to solve for the flow velocity v. Flow rate calculation: After obtaining the flow velocity v, the formula for calculating the flow rate Q can be obtained based on the relationship between the flow velocity V and the pipeline cross-sectional area A. Flow rate Q=V × A=V × π r ², where Q represents flow rate, V represents flow velocity, A represents pipeline cross-sectional area, and r represents pipeline radius. Algorithm features: The ultrasonic time difference algorithm has the characteristics of non-contact and no pressure loss, and is suitable for corrosive liquids or large
2. Working principle of ultrasonic flowmeter sensor
Ultrasonic flowmeter sensor calculates flow velocity and flow rate by measuring the time difference between the forward and backward propagation of ultrasonic waves in the fluid.
. 1. Working principle: Ultrasonic flowmeter adopts the time difference method for measurement principle: • The transmitter and receiver are installed in pairs on both sides of the pipeline, alternately emitting and receiving ultrasonic signals • The forward propagation time of ultrasonic waves is short: t ₁=L/(c+v · cos θ) • The backward propagation time of ultrasonic waves is long: t ₂=L/(c - v · cos θ) • Time difference Δ t=t ₂ - t ₁=(2Lv · cos θ)/(c ² - v ² · cos θ) ≈ (2Lv · cos θ)/c ², where L is the length of the acoustic channel, c is the speed of sound, v is the flow velocity, and θ is the angle between the ultrasonic bending wave path and the fluid flow direction. 2 System composition • Sensor probe: Piezoelectric ceramic transducer (commonly used frequency 0.5-2MHz) • Signal processing unit: Time measurement accuracy can reach 0.1ns • Calculation module: Real time calculation using DSP chip • Temperature compensation module: PT100 temperature sensor compensates for changes in sound velocity 3 Installation method • External clamp typ