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A traceable liquid sinusoidal pressure calibrating device

A technology for calibrating devices and pressures, applied in the measurement of fluid pressure, measuring devices, instruments, etc., can solve the problems of unreliable traceability of dynamic pressure values, limited range, etc., to eliminate system errors, improve measurement accuracy, and increase frequency bandwidth. Effect

Active Publication Date: 2016-11-23
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology

[0003] The purpose of the present invention is to design a traceable medium and high frequency sinusoidal pressure calibration device based on laser interferometry to solve the problems of limited range and unreliable traceability of the dynamic pressure value of the traditional sinusoidal pressure calibration device, so as to meet the requirements of aerospace engines. Requirements for traceability and on-site calibration of broadband dynamic pressure measurement values ​​such as development tests and aerodynamic research tests

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  • A traceable liquid sinusoidal pressure calibrating device

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Embodiment Construction

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0018] Such as figure 1 , figure 2 As shown, a traceable liquid sinusoidal pressure calibration device includes a liquid sinusoidal pressure generator, a liquid dynamic pressure laser interferometry system, a vibration isolation platform, a static pressure loading system, and a data acquisition and analysis system.

[0019] The liquid sinusoidal pressure generator includes a piezoelectric transducer 1, a main resonant lumen 2, a sub-resonant lumen 3, and a flexible connector 4; the main resonant lumen 2 and the sub-resonant lumen 3 are connected through a flexible connector 4; The resonant tube cavity 2 is used to generate the resonance of the water medium at a series of equally spaced resonance points, and its length is designed according to the first-order resonance frequency and the quarter-wavelength formula; the sub-resonant tube cavity...

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Abstract

The invention relates to a traceable liquid sinusoidal pressure calibrating device based on an optical measurement method, and belongs to the field of optical metrology and measurement. The traceable liquid sinusoidal pressure calibrating device comprises a liquid sinusoidal pressure generator, a liquid dynamic pressure laser interference measurement system, a vibration isolation platform, a static pressure loading system and a data acquisition and analysis system. According to the invention, the frequency bandwidth of a sinusoidal pressure source is increased through cooperation between a piezoelectric transducer and a double-resonance tube cavity, and a frequency vacancy caused by the anti-resonance of a pressure transducer is filled; measurement of the refractive index change of water through a laser interferometric measuring system with a extremely high frequency band and in-situ static calibration enable dynamic pressure values to be reliably traced to static pressure; systems errors due to optical window vibration and the reflective index difference between water and air are eliminated through an optical window compensation cavity; a laser measurement optical head is fixedly connected with a secondary resonance tube and connected flexibly with a main resonance tube to eliminate the measurement errors introduced by the complex motion of the tubes driven by a transducer and improve the measurement accuracy.

Description

technical field [0001] The invention relates to a traceable liquid sinusoidal pressure calibration device based on an optical measurement method, which belongs to the optical metrology testing technology. Background technique [0002] With the increasing demand for dynamic pressure testing in the fields of civil engineering, rail transit, national defense and military industry, etc., the sinusoidal pressure calibration device, as the most suitable tool for the quantitative evaluation of the dynamic performance of the pressure testing system, has been paid more and more attention. The sinusoidal pressure calibration device can be divided into many types according to the mechanism of occurrence, but there are two main problems. One is that the range is limited, especially the frequency range is limited, and it is difficult to generate high-frequency sinusoidal pressure above 10kHz; the other is that most of them use the comparison method. The pressure value cannot be reliably ...

Claims

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Application Information

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IPC IPC(8): G01L27/00
Inventor 杨军李程张大治李亚静蔡菁史博李博俞锦
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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