Ultrasonic Flow Meter Working Principle Ppt
Ultrasonic flow meters measure the difference of the transit time of ultrasonic pulses propagating in a flowing fluid.
Ultrasonic flow meter working principle ppt. Ultrasonic flow meters operate using the transit time differential method. The article explains what you need to know about the basics of ultrasonic flow measurement and its applications. Ultrasonic flow meters have many applications from process flow to custody flow. Temporary flow measurements can be made using portable ultrasonic flowmeters with clamp on transducers.
Imagine two canoes crossing a river on the same diagonal line one with the flow and the other against the flow. Ultrasonic flowmeters do not obstruct flow so they can be applied to sanitary corrosive and abrasive liquids. The transit time differential measurement is based on a simple physical fact. Each sensor alternately can transmit and receive ultrasonic signals.
In my previous video https youtu be 8llrbvlydbo i told the working principle of variable area flow meter and in todays video i want to tell about the meas. The working principle of ultrasonic flow meter is it uses sound waves to resolve the velocity of a liquid within a pipe. It is also a common practice to use a clamp on ultrasonic flow meter to verify other flow meters or for temporary measurement. An emitter sends ultrasonic waves at frequency f1 approx.
There are two conditions in the pipe like no flow and flowing. Principle doppler flow meters operate similarly to the radar speed traps used on the road. In the first condition the frequencies of ultrasonic waves are transmitted into a pipe its indications from the fluid are similar. Inside the ultrasonic flow meter pairs of sensors are fitted across the tube in opposite to each other.
This time difference is a measure for the average velocity of the fluid along the path of the ultrasonic beam. The ultrasonic waves strike particles moving through the sound field at velocity vp. Simultaneously the transit time of these signals are measured. Conversely the piezo electric crystal creates a.
Some ultrasonic flowmeters use clamp on transducers that can be mounted external to the pipe and do not have any wetted parts. The ultrasonic signals are generated by piezo electric crystals applying a voltage.