Online measurement method for effective volume of piston cylinder of piston type gas flow standard device

A technology of gas flow and measurement method, applied in the field of gas flow detection, can solve the problems of low measurement efficiency, inability to measure the middle part of the piston cylinder, affecting the flow value of the piston device, etc., so as to improve the measurement accuracy and improve the measurement efficiency.

Active Publication Date: 2020-02-28
NAT INST OF METROLOGY CHINA
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Problems solved by technology

[0012] The contact measurement in the prior art is easy to damage the inner wall of the piston cylinder; the three-coordinate measuring machine can only get the data at both ends of the inner diameter of the piston cylinder, and cannot directly measure the middle part of the piston cylinder, and the evaluation of the inner diameter is unreliable; the three-coordinate measuring mach

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  • Online measurement method for effective volume of piston cylinder of piston type gas flow standard device
  • Online measurement method for effective volume of piston cylinder of piston type gas flow standard device

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Embodiment Construction

[0031] In order to facilitate the understanding of the present invention, the embodiments of the present invention will be described below in conjunction with the accompanying drawings. Those skilled in the art should understand that the following description is only for the convenience of explaining the present invention, not as a specific limitation on its scope.

[0032] figure 1 Shown is the measurement principle of the laser interferometer of the present invention. After the light emitted by the laser source is split by the beam splitter, one beam is irradiated to the moving reflector, and the other beam is irradiated to the fixed reflector. The two laser beams pass through the fixed reflector respectively. After being reflected by the moving mirror, it is incident on the detector, and the processor calculates the interference fringe difference between the two beams generated to obtain the position information of the moving mirror.

[0033] Based on the above measurement ...

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Abstract

The invention discloses an online measurement method for the effective volume of a piston cylinder of a piston type gas flow standard device. Volume calibration needs to be carried out regularly in apiston type gas flow using period, a laser interferometer is used for measuring the movement distance of a piston, spectral confocal measurement technology measurement and outer diameter measurement are combined to obtain the inner diameter of a piston cylinder, and the effective volume of the piston cylinder is obtained. Therefore, periodic calibration of the volume of the piston cylinder can besimplified, on-line measurement of the volume of the piston cylinder is completed on the premise that the piston cylinder is not disassembled, and the online measurement method has the advantages of being high in measurement precision and convenient to calibrate.

Description

technical field [0001] The invention belongs to the field of gas flow detection, and in particular relates to an online measurement method for the effective volume of a piston cylinder based on a piston-type gas flow standard device. [0002] technical background [0003] At present, the standard device for achieving the minimum gas flow in my country is the pVTt device, which can achieve a minimum flow of 333ml / min. When it detects that the gas flow through the Venturi nozzle is the minimum flow, it takes half an hour, so the pVTt device In the measurement of small flow rate, the smaller the gas flow rate, the longer the test time is required, the test efficiency is low, and the pVTt device can only detect the critical flow Venturi nozzle, which has a single purpose. [0004] Compared with the traditional dynamic volume-time gas flow device, the piston gas flow standard device has the advantages of simple structure and low environmental requirements, and has obvious advantage...

Claims

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Application Information

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IPC IPC(8): G01B5/00G01B5/08G01B11/02G01B11/06G01B11/12G01B21/10
CPCG01B5/0021G01B5/08G01B21/10G01B11/06G01B11/12G01B11/02
Inventor 崔骊水李培晶李春辉
Owner NAT INST OF METROLOGY CHINA
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