Abstract: The principle information of the frequency difference method of the
ultrasonic flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. In order to eliminate the influence of the speed of sound c, the frequency difference method is often used. It can be seen from the above that the difference between the frequencies of the ultrasonic waves received by the upstream and downstream receivers is ▽f, which can be expressed by the following formula ▽f=[(c+u)/L]-[(c-u)/L]=2u/L Thus It can be seen that as long as ▽f is measured, the flow rate can be obtained. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the principle of frequency difference method of ultrasonic flowmeters. In order to eliminate the influence of the speed of sound c, the frequency difference method is often used. It can be seen from the above that the difference between the frequencies of the ultrasonic waves received by the upstream and downstream receivers is ▽f, which can be expressed by the following formula ▽f=[(c+u)/L]-[(c-u)/L]=2u/L thus It can be seen that the flow rate Q can be obtained as long as ▽f is measured, and this method has nothing to do with the speed of sound. Ultrasonic technology and its application 1. General situation without measuring water level Currently, hydropower stations mostly use float-type liquid level gauges or input-type liquid level gauges for water level measurement. The disadvantages are: low measurement accuracy, unreliable, often the float is stuck and the sensor is blocked, resulting in inaccurate measurement; heavy maintenance workload, inconvenient installation and debugging, only analog alarm signals are collected, and cannot be directly entered into the power plant computer. surveillance system. Not practical for unattended power plants. We have repeatedly compared the water level measurement system of the trash rack, and optimized the final scheme design. The ultrasonic level gauge is used to accurately monitor the water level before and after the grid in real time. The ultrasonic level gauge uses PLC to process the collected amount. And the real-time water level and differential pressure data are sent to the central control room, and the ultrasonic level gauge displays and alarms when the limit is exceeded. The ultrasonic level gauge adopts the RS422/RS232 interface at the same time, and sends the real-time data to the industrial computer in the centralized control room of the dam, processes it into a computer communication message, and finally sends the collected data to the upper computer of the power plant computer monitoring system. After the implementation of the project, it not only meets the multi-point real-time monitoring and alarm function of the water level and pressure difference before and after the waste fence, but also ends the situation that the measurement system of the waste fence works independently and cannot communicate with the computer monitoring system of the power plant. Realize the integration with the monitoring function, control function and ON-CALL paging system function of the gate system in case of failure. It meets the needs of unattended power stations. This technology is still the first in the power system of Yunnan Province. 2. The principle of ultrasonic level gauge to measure water level and installation requirements The same transducer (probe) receives and converts it into an electrical signal. The time between pulse transmission and reception (the movement time of the sound wave) is proportional to the distance from the transducer to the surface of the object. The relationship between the distance S of the sound wave transmission, the speed of sound C and the transmission time T can be expressed by the formula: S=CⅹT /2 For example: the speed of sound C=344m/s, the transmission time is 50ms, the transmission distance can be calculated as 17.2m, and the measurement distance is 8.6m. three. The effect of the application of programmable ultrasonic trash rack water level measurement system in Tianba Power Station The use of ultrasonic liquid level gauges to measure dam water level is not common in China, and there is no technical experience to draw on. Under such circumstances, we make full use of the advanced technology in the field of PLC and ultrasonic level gauge, according to the overall planning, long-term consideration, in place at one time, avoid repeated transformation and repeated investment, and design the project by ourselves. Completed this task successfully. Gained valuable experience in this field. It provides an example that can be used for reference for the current domestic hydropower stations in my country to realize the dam water level monitoring system. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Principle of Frequency Difference Method of Ultrasonic Flow Meter'
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