A Precise Measurement Method of Internal Temperature of Alkali Metal Gas Chamber Based on Mixed Optical Pumping
A technology of alkali metal gas chamber and internal temperature, applied in thermometers, thermometers, measuring heat and other directions with physical/chemical changes, can solve the problem of atomic gyro drift that affects the sensitivity of atomic magnetometers, the influence of alkali metal atom polarizability, and the inability to Realizing the precise control of alkali metal gas chamber temperature and other issues
Active Publication Date: 2019-04-30
杭州诺驰生命科学有限公司
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[0003] Commonly used detection methods use contact temperature measurement methods such as thermal resistance, which can only measure the temperature of the oven and the wall of the alkali metal gas chamber, and cannot accurately obtain the temperature inside the alkali metal gas chamber, and cannot accurately control the temperature in the alkali metal gas chamber. It will have a great impact on the polarizability of alkali metal atoms, which in turn affects the sensitivity of the atomic magnetometer and the drift of the atomic gyroscope
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[0043] like figure 2 As shown, the present invention is based on the basic requirements of system design, and the entire optical path system includes a laser 1, a chopper 5, a 1 / 2 wave plate 2, a polarization beam splitter 4, a depolarization beam splitter 6, a lock-in amplifier 10, and a wavelength meter 3 , photoelectric detection 8 and 9, alkali metal gas chamber 7, data acquisition system 11.
[0044] like figure 1 Shown, the inventive method realizes as follows:
[0045] (1) Install the gas chamber filled with two kinds of alkali metal atoms of K and Rb to be measured in such as figure 2In the experimental system shown, it was heated to a lower start-up temperature.
[0046] The laser light output by the laser 1 passes through the wave plate 2 and the polarizing beam splitter prism 4 and is divided into two beams of light. One beam is transmitted to the wavelength meter 3 to measure its frequency, and the other beam enters the chopper 5 to modulate the light. A depo...
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The invention relates to a method for precisely measuring the internal temperature of an alkali metal air chamber based on mixed optical pumping, and the method comprises the steps: heating the alkali metal air chamber filled with K and Rb atoms to a lower start temperature, measuring the laser absorption spectrum of K and Rb atoms, carrying out the fitting calculation through a theoretical formula, and obtaining the densities of K and Rb atoms under the start temperature, jointing the Raoult's law simultaneously, obtaining the start temperature and the saturated vapor pressure of K and Rb atoms under the start temperature, and calculating the mole fraction ratio of K and Rb atoms; heating the air chamber to to-be-measured temperature. Because the density of Rb atoms nearby a resonant point in an SERF state and the absorption is intense and there is a big deviation in the density of Rb atoms obtained through curve fitting, the method employs a spectrum absorption method to obtain the density of K atoms, and obtains the to-be-measured temperature through combination with the mole fraction of K atoms. The method can be used for the precise measurement of the internal temperature of the alkali metal air chamber employed by an atom magnetometer based on mixed optical pumping and an atom spinning gyro.
Description
technical field [0001] The invention relates to a precise measurement method for the internal temperature of an alkali metal gas chamber based on mixed light pumping, which can be applied to alkali metal gas chambers used in instruments such as atomic magnetometers and atomic spin gyroscopes based on mixed light pumping Accurate measurement of internal temperature. Background technique [0002] Alkali metal gas cells are the core sensitive devices of quantum measuring instruments such as atomic magnetometers and atomic gyroscopes. Accurate detection of the inner temperature of the alkali metal gas chamber is a prerequisite for realizing high-precision control of the inner temperature of the alkali metal. The sensitivity of the atomic magnetometer and the drift of the atomic gyroscope are closely related to the polarizability of the alkali metal atoms, and the polarizability of the alkali metal atoms is affected by the temperature. Therefore, it is of great significance to ...
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IPC IPC(8): G01K11/00
CPCG01K11/00
Inventor 房建成池浩湉王许琳全伟
Owner 杭州诺驰生命科学有限公司