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Ultrasonic flowmeter compatible with both of pulse doppler method and propagation time difference method, method and program for automatically selecting the measurement method in the flowmeter, and el

A pulsed Doppler and measurement method technology, applied in the field of ultrasonic flowmeters, can solve the problems of limited flow rate measurable range and inability to measure fluids, and achieve high accuracy.

Active Publication Date: 2007-02-28
FUJI ELECTRIC CO LTD
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  • Description
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Problems solved by technology

However, there are problems in that correct measurement cannot be performed in fluids that contain few air bubbles and / or particles, and the measurable range of flow velocity is limited

Method used

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  • Ultrasonic flowmeter compatible with both of pulse doppler method and propagation time difference method, method and program for automatically selecting the measurement method in the flowmeter, and el
  • Ultrasonic flowmeter compatible with both of pulse doppler method and propagation time difference method, method and program for automatically selecting the measurement method in the flowmeter, and el
  • Ultrasonic flowmeter compatible with both of pulse doppler method and propagation time difference method, method and program for automatically selecting the measurement method in the flowmeter, and el

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no. 1 example

[0034] FIG. 4 is a flowchart of a handover operation according to the first embodiment of the present invention. According to the invention, the method shown in FIG. 4 is carried out for each measurement cycle. When the process in part (a) of Figure 4 begins, it is determined what the current flow measurement method is (step 102). Due to the switching of the control method of the control unit 7, the control unit 7 naturally knows the current flow measurement method. If the current flow measurement method is the pulse Doppler method, then control passes to step 104, and based on the results of the Nprf measurements performed so far, the relevant received signal (i.e., the Doppler flow shown in part (c) of FIG. 3 ) is generated. An index value of the reliability of the received wave fd(i)).

[0035] Part (b) of FIG. 4 shows an example of the method in step 104 . As shown in part (b) of Figure 4, for example, in step 104a, the amplitude of the received wave is obtained, that i...

no. 2 example

[0060] FIG. 6 is a flow chart of a handover operation according to a second embodiment of the present invention. The method shown in FIG. 6 first executes steps 302 and 304 . The method in step 302 is the same as step 120a shown in part (b) of FIG. 5 , and the method in step 304 is the same as step 122 in part (a) of FIG. 5 . When the determination (122) in step 304 is "Yes", then it is determined that measurements cannot be made in the pulse Doppler method, and the method is switched to the through-time method (step 306), terminating the process. However, when the determination (122) in step 304 is "No", it is not immediately determined that the pulse Doppler method will be continued, but it is determined in steps 308 to 318 which of the pulse Doppler method and the transit time method is more suitable , and use a more appropriate method. If neither fit, then determine that there is some sort of abnormal condition. In the example shown in FIG. 6, the method in step 120a sh...

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Abstract

The reliability of a reception wave from a transducer is checked and when the reliability is determined to be insufficient, a method different from the current method is selected. The reliability is judged by calculating a value serving as an index of the reliability of the reception wave and checking whether the value is smaller than a predetermined set value. When the value is smaller than the set value, the reliability is judged to be insufficient. The values serving as an index of the reliability of the reception wave may be the amplitude of the reception wave, the ratio of the amplitude of the reception wave against a predetermined measurable amplitude value, the ratio of the power spectrum against a predetermined power value, the ratio of the transmission wave amplitude against the maximum amplitude of the reception wave, the ratio of the power spectrum of the transmission frequency included in the reception wave and obtained by Fourier transform of the reception wave against a predetermined power value, and the like.

Description

technical field [0001] The present invention relates to a technique of switching a measurement method between a pulse Doppler method and a transit time method using an ultrasonic flowmeter capable of measuring flow in both the pulse Doppler method and the transit time method. Background technique [0002] The pulse Doppler method and the transit time method are known ultrasonic flow measurement methods. [0003] Flow measurement in the pulsed Doppler method employs Doppler frequency shift, in which ultrasonic pulses are transmitted to the fluid to be measured, and the frequency of the ultrasonic echoes reflected by inclusions such as air bubbles present in the fluid is changed with A quantity proportional to flow rate. Compared with the through-time method, the pulse Doppler method is characterized by high accuracy, quick response, excellent anti-bubble characteristics, and high accuracy even in skewed flow by providing multi-level measurement lines . However, there are p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/66G01F7/00
CPCG01F1/667G01F7/00G01F1/663
Inventor 大室善则矢尾博信山本俊广
Owner FUJI ELECTRIC CO LTD
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