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Pressure-broadening-based alkali metal stream atomic density measuring method

A technology of atomic density and measurement method, applied in measurement devices, specific gravity measurement, instruments, etc., can solve the problems of complex experiments, narrow curve line width, large errors, etc., to achieve the effect of simple and reliable method and avoid density measurement errors

Active Publication Date: 2013-12-11
BEIHANG UNIV +1
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  • Abstract
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Problems solved by technology

According to the non-broadened absorption spectrum line integration method to measure the atomic density of alkali metal vapor, due to the small Doppler broadening coefficient at low temperature and the narrow line width of the curve, the performance requirements of the laser are high; if it is heated at high temperature, the alkali metal vapor It is difficult to accurately and stably control and predict the temperature, and the error is large
The atomic density measurement method based on the Faraday effect requires Faraday modulation when extracting the rotation angle of the first polarized light, and the modulated Faraday crystal is susceptible to drift due to temperature, and the experiment is more complicated

Method used

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  • Pressure-broadening-based alkali metal stream atomic density measuring method
  • Pressure-broadening-based alkali metal stream atomic density measuring method
  • Pressure-broadening-based alkali metal stream atomic density measuring method

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Embodiment Construction

[0020] Such as figure 1 Shown, the specific implementation steps of the present invention are as follows:

[0021] 1. Make a glass air chamber containing alkali metal and a vacuum air chamber filled with positive pressure gas and vacuum conditions, and heat it evenly with an oven.

[0022] 2. Put the glass air chamber made in step 1 in such as figure 2 In the experimental device shown, 1 is a DFB laser, 2 is a collimator lens, 3 and 5 are 1 / 2 wave plates, 4 and 6 are PBS, 7 is a glass air chamber, and the 3 in the figure are vacuum air chambers. Chamber, vacuum alkali metal gas chamber, alkali metal gas chamber filled with positive pressure gas, 8 is a photodetector, and 9 is a data acquisition board.

[0023] The gas chamber is irradiated with a laser with a stable power and the frequency is swept, and the absorption curve of the alkali metal is measured. The specific steps are:

[0024] 1) Pass the laser twice through the beam splitting prism and divide it into three be...

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Abstract

The invention discloses a pressure-broadening-based alkali metal stream atomic density measuring method, relating to an alkali metal atomicity density measuring method. The method comprises the following steps of: firstly, producing an alkali metal air chamber filled with positive pressure gas and uniformly heating; secondly, radiating the air chamber by utilizing stable-powder laser and carrying out frequency sweeping so as to measure an absorption curve of the alkali metal, and carrying out negative logarithm taking processing to obtain an optical depth curve; finally, carrying out lorentz nonlinear fitting on the obtained data, acquiring the overall width of a half peak value of a lorentz curve, thus obtaining pressure broadening parameters and further obtaining the air pressure of the filled gas; obtaining the atomicity density of alkali metal steam according to a peak value of the lorentz curve, thereby realizing the measurement of the atomic density and gas pressure intensity of the alkali metal air chamber.

Description

technical field [0001] The invention relates to a method for measuring atomic density, in particular to a method for measuring the atomic density of alkali metal vapor based on pressure broadening, which can be used for qualitative and quantitative analysis of physical property experiments of alkali metal atoms. Background technique [0002] The number density of atomic vapor is of great significance for explaining atomic collision experiments, measurement experiments of atomic physical properties, and optical pumping of atoms. Especially the alkali metal atom, because of its simple structure with only one electron in the outermost layer, makes it a key research object of physics and even optics. The traditional method of measuring the density of alkali metal vapor is to measure the temperature of alkali metal vapor, and then obtain it according to the empirical density formula, which is simple but has a large error. According to the non-broadened absorption spectrum line i...

Claims

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Application Information

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IPC IPC(8): G01N9/24
Inventor 全伟郑慧婕房建成龙保华李洋刘翔吴双卿
Owner BEIHANG UNIV
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