Acoustic fluid sensor

A fluid sensor and acoustic sensing technology, which is applied in the direction of transmitting sensing components by wave/particle radiation devices, can solve the problem of low quality factor

Active Publication Date: 2019-03-08
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] An embodiment of the present invention provides an acoustic fluid sensor to solve the defect of

Method used

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Embodiment Construction

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0025] Principle of invention

[0026] During the experiment, a load fluid is injected into the hollow cylindrical shell. When a plane simple harmonic wave of a certain eigenfrequency is incident on the finite-length hollow cylindrical shell perpendicular to the axis, the load fluid (standard fluid or to-be-measured fluid) inside the hollow cylindrical shell Fluid) excites Scholte–Stoneley circular waves orbiting along the hollow cylindrical shell. When the phase velocity of the Scholte–Stoneley circular wave satisfies the condition of phase matching, the Scholte–Sto...

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Abstract

The invention discloses an acoustic fluid sensor. The acoustic fluid sensor comprises an acoustic sensing device, an experimental container, an ultrasonic transmitting device, an ultrasonic receivingdevice and a calculation and processing device; the acoustic transmitting device comprises a hollow cylindrical housing for holding a load fluid, and silicone tubes which are arranged at two ends of the hollow cylindrical housing and constitute a through cavity together with the hollow cylindrical housing; the ultrasonic transmitting device transmits ultrasonic waves into an ambient fluid, excitesthe load fluid in the hollow cylindrical housing to form Scholte-Stoneley circular waves; when the Scholte-Stoneley circular waves satisfy a phase matching condition, standing waves are formed aroundthe hollow cylindrical housing so as to generate a local sound field; and the calculation and processing device determines the quality factor of the acoustic fluid sensor based on normalized transmission spectrum data. The coupling degree of the local sound field generated by the acoustic fluid sensor of the invention and the load fluid is large, and the quality factor and sensitivity of the acoustic fluid sensor can be improved. The acoustic fluid sensor is suitable for the high-sensitivity sensing of a trace fluid.

Description

technical field [0001] The invention relates to the technical field of fluid detection, in particular to an acoustic fluid sensor. Background technique [0002] This section is intended to provide a background or context to embodiments of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] In the fields of biochemical detection, clinical medicine, environmental monitoring, and food safety monitoring, the use of acoustic fluid sensors to quickly and accurately detect fluid parameters (such as composition, density, elastic modulus, sound velocity, and viscosity, etc.) has important application value. Acoustic fluid sensors change the properties of the surrounding fluid medium (such as mechanical, chemical, and electrical properties), and can detect the shift of resonance modes such as frequency, amplitude, and phase, thereby realizing the sensing and detection of fluids. [0004] Existi...

Claims

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Application Information

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IPC IPC(8): G01D5/48
CPCG01D5/48
Inventor 蔡飞燕林勤李飞夏向向周伟孟龙郑海荣
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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