Tiny pulsation pressure generator

A pressure generator and dynamic pressure technology, applied in the direction of measuring fluid pressure, instruments, measuring devices, etc., can solve the problems that the frequency range cannot cover infrasound, single frequency, etc., to achieve calibration, reduce distortion, and ensure accuracy Effect

Active Publication Date: 2009-05-27
BEIJING CHANGCHENG METERING TEST TECH INST NO 1 GRP CO CHINA AVIATION IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its frequency is relatively single (250Hz or 1KHz), the micro-pulsation pressure level is usually 124dB, and the uncertainty is 0.2dB, and its frequency range cannot cover infrasound

Method used

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  • Tiny pulsation pressure generator

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Embodiment Construction

[0018] The micro-pulsation pressure generator includes a closed cavity 1, a piston 2, a vibration table 3, a vibration isolation table 4 and an adjustment spring 5, the cavity 1 is a positive cylindrical cavity, and the diameter of the cavity 1 is equal to the length of the cavity 1; The piston 2 is placed between the cavity 1 and the vibrating table 3 and fixed on the vibrating table 3; a vibration isolating table 4 is installed at each end of the vibrating table 3, and the cavity 1 is installed on the vibration isolating table 4, and by adjusting the spring 5 Adjust the coaxiality with the piston 2.

[0019] The cavity 1 is a positive cylinder, the diameter of the cavity is equal to the length, and the center of the side wall of the cavity is provided with a mounting hole for installing the microphone 6 to be calibrated, and the mounting hole and the microphone 6 to be calibrated are sealed by an O-ring .

[0020] The piston 2 is circular, and the moving direction of the pi...

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Abstract

The invention belongs to a dynamic pressure calibration technology, relates to a small pulse pressure calibrator which comprises an enclosed cavity, a piston, a vibration table, an isolation table an adjusting spring, wherein the cavity is a positive cylinder cavity, and the diameter of the cavity is equal to the length of the cavity; the piston is arranged between the cavity and the vibration table and fixed on the vibration table; two ends of the vibration table are respectively provided with the isolation table with the cavity arranged thereon, and the coaxiality between the cavity and the piston is adjusted through the adjusting spring. The invention obtains simulative small pulse pressure through the movement of the piston in the enclosed cavity, and couples the small pulse pressure to a diaphragm of a microphone, so as to enable the small pulse pressure sensitivity response to directly associate with the small pulse pressure change sensed by the diaphragm, and the small pulse pressure change is in a range of 1 to 50 Hz which covers the infrasonic, therefore the small pulse pressure microphone calibration is realized.

Description

technical field [0001] The invention belongs to the dynamic pressure calibration technology and relates to a tiny pulsation pressure generator. Background technique [0002] The dynamic characteristics of micro-pressure sensors are generally worse than those of higher-range sensors. The frequency response (resonance frequency) of similar types of piezoresistive micro-pressure sensors is much lower than that of higher-range sensors. Calibration still lacks effective means, which has formed a restrictive factor for the development and use of micro-pressure sensors for dynamic testing. Moreover, in some fields of aerospace, it is required to simulate the negative pressure measurement environment (the average pressure is lower than the atmospheric pressure) and to generate small-amplitude, high-precision pulsating pressure. Therefore, it is very valuable and necessary to develop a high-precision sinusoidal pressure calibration device with micro-pressure pulsation. [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L27/00
Inventor 李程曾吾王玉芳杨军张秉毅
Owner BEIJING CHANGCHENG METERING TEST TECH INST NO 1 GRP CO CHINA AVIATION IND
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