Piezoelectric fiber array sensor for sensing flow velocity change and measurement method thereof

A technology of array sensor and piezoelectric fiber, which is applied in the direction of fluid velocity measurement, velocity/acceleration/shock measurement, measuring device, etc., can solve the problems of difficult miniaturization, high production cost, long response time, etc., and increase the vibration amplitude , increase bending toughness, and facilitate miniaturization

Active Publication Date: 2018-03-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of measuring the change of flow velocity uses a hot wire flow velocity sensor of mechanical parts, but this device has a long response time, large volume, and is easy to wear
In recent years, ultrasonic anemometers based on ultrasonic propagation and Doppler current meters based on Doppler effect have appeared successively. These two types of flow meters have their own advantages, but due to limited environmental conditions, high production costs, and low detection accuracy, It is not easy to miniaturize and other reasons, so its application promotion is limited

Method used

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  • Piezoelectric fiber array sensor for sensing flow velocity change and measurement method thereof
  • Piezoelectric fiber array sensor for sensing flow velocity change and measurement method thereof
  • Piezoelectric fiber array sensor for sensing flow velocity change and measurement method thereof

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Embodiment 1

[0057] For example: known conditions: when the number m of sensing units is 4, that is, the average number of calculations N is 4; and the induced electrical signal U m ,Right now

[0058]

[0059] According to the formula (1), the quadratic linear fitting method is used to fit the U of the four sensing units in the first step m with V normal relationship, namely:

[0060] According to the formula (2), any two non-parallel strip fiber sensing units can reverse the size and direction of the airflow, namely:

[0061]

[0062] From No. 1 strip piezoelectric fiber sensing unit and No. 2 strip piezoelectric fiber sensing unit, it can be obtained: V 1 =7.5m / s,α 1 =35.7°

[0063]

[0064] From No. 1 strip-shaped piezoelectric fiber sensing unit and No. 3 strip-shaped piezoelectric fiber sensing unit, it can be obtained: V 2 =7.8m / s,α 1 =33.4°

[0065]

[0066] From the No. 4 strip piezoelectric fiber sensing unit and the No. 3 strip piezoelectric fiber sensing...

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Abstract

The invention relates to a piezoelectric fiber array sensor for sensing flow velocity change and a measurement method thereof. The sensor comprises a flexible base, micro array strip-shaped fiber sensing units, conductive thin film and electrode layers; the flexible base is in an axisymmetric shape and is provided with a plurality of side surfaces; the micro array strip-shaped fiber sensing unitsare fixed on the side surfaces through the ends of a suspension beam structure; output units which are composed of the conductive thin film and the electrode layers are arranged on the connection portions of the micro array strip-shaped fiber sensing units and the side surfaces. The measurement method comprises the steps that the piezoelectric fiber array sensor for sensing the flow velocity change is placed in a wind field, the micro array strip-shaped fiber sensing units of the sensor directly face the flow velocity direction, and output signals of the output units of the sensor are collected; then, through a linear fitting method, the mathematic relation of the flow velocity and the sensing electric signals is calibrated.

Description

technical field [0001] The invention relates to a novel micro-piezoelectric fiber array sensor for sensing changes in flow velocity and a measuring method thereof, belonging to the field of bionic materials and intelligent structures. Background technique [0002] Space velocity detection is widely used in robot perception system, meteorological monitoring, biomedicine, aviation guidance and national defense weaponry. The traditional method of measuring the change of flow velocity uses a hot wire flow velocity sensor of mechanical parts, but this device has a long response time, a large volume, and is easy to wear. In recent years, ultrasonic anemometers based on ultrasonic propagation and Doppler current meters based on Doppler effect have appeared successively. These two types of flow meters have their own advantages, but due to limited environmental conditions, high production costs, and low detection accuracy, Its application promotion is limited due to the difficulty o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/08G01P13/02
CPCG01P5/086G01P13/0053G01P13/02
Inventor 彭瀚旻胡捷姚新科
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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