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Do you want to know the measurement principle of ultrasonic open channel flowmeter?
Working principle of ultrasonic open channel flowmeter: The open channel ultrasonic flowmeter consists of an instrument host and an ultrasonic probe. It uses the principle of ultrasonic echo distance measurement to measure the water level, and then the calculation unit inside the instrument host converts the water level signal into a flow signal.. Principle of Ultrasonic Liquid Level Measurement: The ultrasonic water level flowmeter uses ultrasonic distance measurement method to measure the liquid level. The probe is installed above the water level observation point of the measuring weir (as shown in Figure 2). The probe emits ultrasonic waves towards the water surface, and the energy of the ultrasonic waves is reflected by the water surface and received by the probe over time. Based on the propagation speed and time T of ultrasonic waves, the instrument calculates the channel water depth H. The calculation formula is as follows: H=L-D=L-V * T/2=L - (V0+at) * T/2, where H represents the height of the desired liquid level; L represents the distance between the ultrasonic probe and the bottom of the open channel, V represents the speed of ultrasonic waves in the air, T is the preparation time for the ultrasonic wave to pass through one beat search return, V0 represents the propagation speed of ultrasonic waves in the air at 0 ℃, a is the temperature coefficient of ultrasonic velocity, and t is temperature. As can be seen from the above equation, the accuracy of liquid level measurement depends on the measurement accuracy of ultrasonic velocity v and the measurement accuracy of ultrasonic propagation time when L is known. _600x400.jpg)
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2. Ultrasonic level gauge
3. Working principle of portable open channel flowmeter
The working principle of portable open channel flowmeter is based on non-contact ultrasonic measurement technology, which measures the liquid level height in the open channel weir trough through acoustic reflection, and calculates the flow rate by combining the mathematical relationship between vertical flow rate and liquid level.
. The specific principle is as follows:1. Ultrasonic liquid level measurement non-contact detection: the instrument emits ultrasonic pulses to the liquid level of the open channel, and the sound waves reflect back to the sensor after encountering the liquid level. By calculating the round-trip time (time difference) of the sound waves and the known sound speed, the liquid level height is obtained. Advantages: No mechanical transmission components, avoiding wear and tear, with features such as maintenance free, long service life, and strong anti-interference ability; Digital signal processing technology further improves measurement stability and accuracy. 2. Mathematical conversion of flow rate and liquid level. Flow characteristics of open channels: In open channels, the flow rate is positively correlated with the liquid level height - the larger the flow rate, the higher the liquid level; The smaller the flow rate, the lower the liquid level. The function of a measuring weir groove is to establish a definite functional relationship between flow rate and liquid level by installing geometric dimensions and material fixed measuring weir grooves (such as triangular weirs, rectangular weirs, Bacher grooves, etc.). For example, a triangular weir: The relationship between flow rate (Q) and