Various mixed gas pressure measuring device and method based on saturation absorption spectrum

A technology of mixed gas and absorption spectrum, which is applied to fluid pressure measurement using optical methods, and can solve problems such as cumbersome calculation processes

Active Publication Date: 2017-04-26
BEIHANG UNIV
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  • Abstract
  • Description
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Problems solved by technology

However, the calculation process of the above two

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  • Various mixed gas pressure measuring device and method based on saturation absorption spectrum
  • Various mixed gas pressure measuring device and method based on saturation absorption spectrum
  • Various mixed gas pressure measuring device and method based on saturation absorption spectrum

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Embodiment Construction

[0046] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0047] Such as figure 1 As shown, the present invention is based on a variety of mixed gas pressure measuring devices based on saturated absorption spectroscopy, including a laser 1, a beam splitting prism 2, a liquid crystal variable wave plate 3, a linear polarization device 4, a polarization beam splitting prism 5, a chopper 6, Linear polarization device 7, gas chamber 8, first photodetector 9, wavelength meter 10, second photodetector 11, lock-in amplifier 12 and data acquisition system 13;

[0048] Such as figure 2 Shown, the specific implementation steps of the present invention are as follows:

[0049] (1) Heating the gas chamber 8 filled with n kinds of alkali metal atoms and 4n kinds of gases to a stable temperature, the laser 1 first adopts a laser whose tunable range is near the D1 line of the first kind of alkali metal atoms, and the ou...

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Abstract

The invention relates to a various mixed gas pressure measuring device and method based on a saturation absorption spectrum; the method comprises the following steps: measuring a laser absorption spectrum of the alkali metal atom when various gases exist in an alkali metal air chamber, fitting to obtain the aliasing pressure broadening and frequency shift of the various mixed gases in the alkali metal air chamber; simultaneously calculating to obtain pressure of each of various gases according to pressure broadening and frequency shift corresponding to known single and unit pressure gas. When n alkali metals exist, the device and method can measure 4n mixed gases at most. When the alkali metal air chamber contains two or more mixed gases, the method and the device can preciously measure the pressure, i.e., the inertia based on spin exchange relaxation free regime and the alkali metal air chamber portion in a magnetic field measure apparatus.

Description

technical field [0001] The invention relates to a pressure measuring device and method for various mixed gases based on saturated absorption spectroscopy. The method is suitable for ultra-high sensitivity inertial and magnetic field measuring devices based on atomic spin-free exchange collision relaxation (Spin Exchange Relaxation Free Regime) alkali metal When multiple gases are contained in the gas cell section, precise pressure measurement of each gas. Background technique [0002] The alkali metal gas cell is the core sensitive device of the ultra-high sensitivity inertial and magnetic field measurement device based on atomic spin-free collision relaxation (Spin Exchange Relaxation FreeRegime). In order to prevent the collision between the alkali metal atom and the wall of the gas cell to cause the electron spin relaxation of the alkali metal, an inert gas will be filled in the alkali metal gas cell as a buffer; in order to realize the absorption of spontaneous emission ...

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Application Information

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IPC IPC(8): G01L11/02
CPCG01L11/02
Inventor 房建成池浩湉全伟王许琳陈瑶卢妍魏凯赵天
Owner BEIHANG UNIV
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