Ultrasonic flow measurement method based on time-difference method and Doppler method
A Doppler method and ultrasonic technology, applied in the field of fluid measurement, can solve problems such as sound path failure, lower device measurement accuracy, sound path failure to work normally, etc., and achieve the effect of convenient installation and use
Inactive Publication Date: 2017-05-17
NANJING NARI GROUP CORP +1
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Problems solved by technology
[0014] However, after long-term use of the time-difference multi-sound channel ultrasonic flowmeter, or due to installation problems, individual sound channels often fail to work normally.
Each sound path is composed of a pair of ultrasonic transducers, as long as one of them is blocked or damaged, the sound path will fail
Although a sound path problem does not affect the overall flow measurement of the device, it will significantly reduce the measurement accuracy of the device
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[0036] It will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0037] combine figure 1 and figure 2 As shown, when using the transit time difference method to measure tassels, if any transducer in a single sound path is damaged or fails to work normally, the flow velocity of the sound path cannot be measured by the transit time difference method. The invention combines the time difference method with the Doppler method, so that when a transducer in a single sound path fails to work normally, the sound path can still complete the flow velocity measurement task.
[0038] refer to image 3 Shown, the present invention is based on the time difference method and the ultrasonic current measuring method of Doppler method, comprises the following steps:
[0039] Step 1. Determine whether the sound path is valid, that is, whether the two ultrasonic transducers in the sound path are normal. If the sound path is valid, calculate th...
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The invention discloses an ultrasonic flow measurement method based on the time-difference method and the Doppler method. The ultrasonic flow measurement method includes judging whether an acoustic path is effective or not, namely, whether two ultrasonic transducers in the acoustic path are normal or not; if the acoustic path is effective, calculating flow rate of the acoustic patch according to the time-difference method; if the acoustic path is ineffective, judging whether both of the transducers in the acoustic path are damaged or not; if the transducers are damaged, finishing flow measurement; if only one transducer is damaged, measuring the flow rate by the undamaged transducer according to the Doppler method to further acquire a flow rate measurement result. The ultrasonic flow measurement method has the advantages that through combination of the time-difference method and the Doppler method, flow rate measurement can be still completed in case of failure of the acoustic path on site, so that measuring accuracy of an ultrasonic flow meter is guaranteed; the transducers are shared by the time-difference method and the Doppler method, so that addition of any equipment or devices is not needed, and installation and use of the flow meter are facilitated.
Description
technical field [0001] The invention relates to the technical field of fluid measurement, in particular to an ultrasonic flow measurement method based on a time difference method and a Doppler method. Background technique [0002] Ultrasonic flowmeter has been developed so far. Among many measurement methods, transit-time ultrasonic flowmeter has the advantages of simple measurement method and high measurement accuracy, and has always attracted attention. [0003] The working principle of the time-difference method ultrasonic flowmeter is to calculate the flow velocity based on the difference between the forward-flow propagation time and the reverse-flow propagation time of the ultrasonic signal, as shown in the attached manual figure 1 shown. [0004] This is a schematic diagram of flow measurement in a pressurized pipeline. Ultrasonic transducers A and B are a pair of transducers in the same sound path, when one of them is used as a transmitting transducer, the other is ...
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Login to View More IPC IPC(8): G01F1/66
CPCG01F1/663
Inventor 夏洲朱浩刘占果吴健张大朋李钦思韩浩
Owner NANJING NARI GROUP CORP