Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for combined pulse speed measurement for acoustic Doppler flow rate section plotter

An acoustic Doppler and combined pulse technology, used in fluid velocity measurement, velocity/acceleration/shock measurement, instruments, etc. simple steps

Active Publication Date: 2014-04-16
NANJING SHIHAI ACOUSTIC TECH CO LTD
View PDF6 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the basis of improving frequency measurement accuracy and operating distance, this method has improved spatial resolution compared with single-bandwidth pulses, but it still cannot meet the increasing spatial resolution requirements for flow velocity profile measurement.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for combined pulse speed measurement for acoustic Doppler flow rate section plotter
  • Method for combined pulse speed measurement for acoustic Doppler flow rate section plotter
  • Method for combined pulse speed measurement for acoustic Doppler flow rate section plotter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] The principle and implementation process of the present invention will be further elucidated below in conjunction with specific embodiments. It should be understood that this embodiment is only used to illustrate the present invention and not to limit the scope of the present invention.

[0017] Such as figure 1 , 2 As shown, the transmitted signal is a combined pulse x=[x 1 ,x 2 ,x 3 ,...,x N , where the frequency of each sub-pulse is f i = f 0 +Δf(i-1), i=1,2,...,N. When measuring the radial flow velocity at a depth of h0, the echo signal y received by the transducer is composed of the echo sub-pulse y i composition y = [y 1 ,y 2 ,y 3 ,...,y N ]. If the Doppler shift is not 0, then the length of y is different from the length of x. Select the shorter vector in x and y to pad with zeros at the end, so that the length of the zero-padded vector is equal to the length of the longer vector. Multiply the two vectors x and y after zero padding, and pass throug...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for combined pulse speed measurement for an acoustic Doppler flow rate section plotter. An acoustic wave energy exchanger is adopted by the acoustic Doppler flow rate section plotter to serve as a sensor, scattering echoes are generated by sound wave pulses transmitted by the acoustic Doppler flow rate section plotter through an irregular scattering body in water, and after the scattering echoes are received by the acoustic wave energy exchanger, the radial water flow speed is obtained through analysis and processing. The method is characterized in that combined pulses serve as transmitting signals of the acoustic wave energy exchanger; after echo signals are received by the acoustic wave energy exchanger, the echo signals are multiplied by transmitted combined pulse signals; a result is analyzed through a low-pass filter wave and a following frequency spectrum, and therefore the radial flow speed needing to be measured is obtained.

Description

technical field [0001] The invention relates to a combined pulse velocity measurement method for an acoustic Doppler velocity profiler (ADCP), belonging to the technical field of underwater acoustic signal measurement. Background technique [0002] Different from propeller and electromagnetic current meters, the acoustic Doppler current profiler (Acoustic Doppler Current Profiler, ADCP) uses an acoustic transducer as a sensor, and the sound pulse emitted by it passes through the unevenly distributed sediment particles in the water body. , Plankton and other scatterers produce scattered echoes, which are received by the transducer, and the radial flow velocity is measured and calculated by Doppler frequency shift estimation, that is, the part of the water flow velocity parallel to the sound wave beam emitted by the sound wave transducer, and then according to the sound wave The angle between the beam and the direction of the water flow calculates the speed of the water flow. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/24
Inventor 方世良韩宁
Owner NANJING SHIHAI ACOUSTIC TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com