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Shear flow sensor

A sensor and shear flow technology, applied in the field of sensors, can solve the problems of small deformation and easy breakage of piezoelectric ceramics, and achieve the effects of good stability, uniform force and high impact resistance

Active Publication Date: 2010-01-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the piezoelectric ceramic sensor has many advantages, it also exposes some defects caused by the material itself during use, for example, the deformation of the piezoelectric ceramic is small, so it is easy to break, etc.

Method used

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Embodiment Construction

[0031] Below in conjunction with accompanying drawing and embodiment the present invention will be described in further detail:

[0032] The invention discloses a shear flow sensor, which uses the piezoelectric effect of a piezoelectric film material to measure ocean turbulent force. Such as figure 2 As shown, the present invention mainly includes a piezoelectric film substrate 7 with a piezoelectric film 6 sealed on its surface, and a probe 9 is provided at one end of the piezoelectric film substrate 7 .

[0033] The piezoelectric film matrix 7 is generally a sheet structure, and the piezoelectric film 6 is pasted on one or both sides of the piezoelectric film matrix 7. When pasted on both sides, the test signal will be strengthened accordingly, so usually Just paste it on one side. The piezoelectric film 6 and the piezoelectric film base 7 must be closely pasted without gaps to achieve a sealed state. The thickness of the piezoelectric film 6 is usually in the range of 0...

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Abstract

The invention discloses a shear flow sensor comprising a piezoelectric film matrix with one end being provided with an aerofoil probe. A piezoelectric film is hermetically sticked to the surface of the piezoelectric film matrix, and two end planes of the piezoelectric film are respectively connected with a lead; the thickness of the piezoelectric film is 0.1-0.5mm, and the piezoelectric film is prepared from one of PVDF and PZT or PT; a connecting rod is in hermetical sleeve joint with the other end of the piezoelectric film matrix, and the piezoelectric film matrix is bonded with the inner wall of the connecting rod by adhesives; a cavity for leading out the lead is arranged in the connecting rod; a protective sleeve is arranged outside the piezoelectric film matrix and is fixed with the connecting rod by a lock nut. The invention can measure the ocean turbulence intensity by using a piezoelectric film material so as to research the ocean turbulence effects, and simultaneously, the performances of each aspect of the shear flow sensor is superior to the performances of a common piezoelectric ceramic sensor.

Description

technical field [0001] The invention relates to a sensor, in particular to a sensor for measuring ocean turbulent changes by using piezoelectric materials. Background technique [0002] Turbulence research is an important field of marine science research. Turbulence has an important contribution to the momentum, heat and mass transport of seawater, and has a significant impact on the velocity of seawater movement, temperature and salinity, and the distribution of dissolved and particulate matter in water. Microstructure That is, the small-scale turbulent motion is the driving force behind the ocean macroscopic phenomena. [0003] People's research on turbulent flow effects is simulated by establishing corresponding mathematical models. In these models, the kinetic energy dissipation rate of turbulence is an important parameter, which directly affects the accuracy of the established model for simulating ocean macroscopic motion. Seawater shear velocity data is an important ...

Claims

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Application Information

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IPC IPC(8): G01M10/00
Inventor 王树新谷磊王延辉王子龙王玉
Owner TIANJIN UNIV
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