Detection method of acoustic Doppler profile flow velocity meter

An acoustic Doppler and detection method technology, applied in the testing/calibration of velocity/acceleration/shock measurement equipment, velocity/acceleration/shock measurement, instruments, etc., can solve the problem of low accuracy, weak reflection intensity, time-consuming force and other problems, to achieve the effect of uniform concentration and improved reflection intensity

Inactive Publication Date: 2015-12-16
NANJING AUTOMATION INST OF WATER CONSERVANCY & HYDROLOGY MINIST OF WATER RESOURCES +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is still a lack of verification / calibration methods for acoustic Doppler profile current meters in China. If the aforementioned straight line open channel type verification method is used, the accuracy is very poor, so acoustic Doppler profile current meters are mostly verified by comparison methods when they leave the factory. However, the comparison test requires time-consuming and labor-intensive field work, and the accuracy is not high
The current test method has insufficient suspended matter, resulting in weak reflection intensity, which may lead to false detection results, or no detection results at all

Method used

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  • Detection method of acoustic Doppler profile flow velocity meter
  • Detection method of acoustic Doppler profile flow velocity meter
  • Detection method of acoustic Doppler profile flow velocity meter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] First, turn on the micro-nano bubble generator 2, and through the pipeline laid on the bottom of the pool and the micro-nano bubble aeration head 3, the air is melted into the water by high-speed rotary cutting. Based on the rotary gas-liquid mixed micro-nano bubble generation technology, the micro-nano bubble The generator quickly and efficiently produces hundreds of nanometers to tens of microns of bubble water, thereby generating micro-nano bubbles. The aeration head sprays micro-nano bubbles to both sides, and these micro-nano bubbles rise naturally.

[0036] After bubbles continue to occur for 70 seconds, there are a large number of micro-nano bubbles in the still water tank 1. At this time, close the micro-nano bubble generator 2 and wait for 3.5 hours.

[0037] Subsequently, the current meter suspended under the verification vehicle travels along the track at a constant speed from one end of the track to the other end. During this process, the data collected by t...

Embodiment 2

[0039] First, the micro-nano bubble generator 2 is turned on, and the micro-nano bubbles are generated through the pipeline laid on the bottom of the pool and the micro-nano bubble aeration head 3 . The aeration head sprays micro-nano bubbles upward, and these micro-nano bubbles rise naturally.

[0040] After bubbles continue to occur for 30 seconds, there are a large number of micro-nano bubbles in the still water tank 1, turn off the micro-nano bubble generator 2, and wait for 15 minutes.

[0041] Subsequently, the current meter suspended under the verification vehicle travels along the track at a constant speed from one end of the track to the other end. During this process, the data collected by the current meter are as follows: Figure 7 , Figure 8 shown, where image 3 It is the profile flow velocity distribution diagram, the number of collected data groups is 91 groups, the invalid data group is 0 group, the bad data unit is 4% (see Table 1), and the amount of bad da...

Embodiment 3

[0043]The operation steps are the same as those in Embodiment 1 or 2, except that the time for continuous generation of bubbles is 5 seconds, and the waiting time after closing the micro-nano bubble generator 2 is 3 minutes. The obtained invalid data sets and bad unit data are shown in Table 1.

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Abstract

The invention discloses a detection method of an acoustic Doppler profile flow velocity meter. The detection method comprises the following steps that micro-nano bubble aerators are laid at the bottom of a pool; a micro-nano bubble generator generates micro-nano bubbles in the pool; the micro-nano bubbles are generated continuously for a time period and then stopped; and a traction and detection vehicle travels at uniform speed along tracks after a wait, and the flow velocity meter on the vehicle collects data. The micro-nano bubble aerators are uniformly arranged at the bottom of the pool to generate uniform micro-nano bubbles in the static pool, so that reflection substance of sufficient concentration is included in the water, the concentration of the reflection substance is uniform, the reflection intensity of static water is substantially improved, and requirements for water detection of the acoustic Doppler profile flow velocity meter are satisfied. Thus, the acoustic Doppler profile flow velocity meter can obtain needed valid data, and high-precision detection of the acoustic Doppler profile flow velocity meter can be realized in a static water tank.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydrological instrument measurement, and in particular relates to a detection method of an acoustic Doppler profile velocity meter. Background technique [0002] The current meter is an instrument for hydrographic testing of rivers, lakes and seas. According to the provisions of the National Metrology Law, the performance of the instrument must be verified when it leaves the factory. At present, my country adopts GB / T150 "Verification / Calibration Method of Rotor Flow Meter in Straight-line Open Channel" to verify the flow meter. The instrument is revised. Acoustic Doppler Profile Velocimeter is a kind of current velocity meter. It uses the principle of acoustic Doppler velocity measurement and adopts vector synthesis method to measure the vertical profile distribution of flow velocity. It can measure the flow velocity of several layers on a section once. The three-dimensional compon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P21/02
Inventor 韩继伟邵军唐跃平符伟杰诸杰孙毅戴佳琦毛春雷刘巽民姚永熙张利茹王岩
Owner NANJING AUTOMATION INST OF WATER CONSERVANCY & HYDROLOGY MINIST OF WATER RESOURCES
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