Non-magnetic Heating and High-precision Temperature Control of the Alkali-metal Vapor Cell in SERF Atomic Spin Gyroscope

doi:10.12382/bgxb.2023.0727

Abstract

Abstract:

The temperature fluctuation and magnetic noise in the alkali-metal vapor cell are key factors that restrict the sensitivity improvement of spin-exchange relaxation-free atomic spin gyroscopes. To deal with these two issues, a laser heating method is proposed to perform non-magnetic heating for the vapor cell, thus fundamentally eliminating the magnetic noise, and the graphene films are deposited on the heating surface, and adjacent upper and lower surfaces of the vapor cell for photothermal conversion, thermal conduction, and stray-light interference avoidance. The combination of linear active disturbance rejection control (LADRC)and thermal management technology is used to improve the temperature control accuracy and stability of alkali-metal vapor cell. A linear active disturbance rejection controller based on temperature control system is designed. A thermal structure is designed and graphene film is selected in consideration of heat conduction, thermal convection and thermal radiation. An experimental platform was built for the temperature control system of alkali-metal vapor cell. The result shows that the temperature control accuracy of temperature control system of alkali-metal vapor cell using LADRC and thermal management technology is ±0.003℃, and the temperature control stability is 6mK. This lays the foundation for improving the sensitivity of atomic spin gyroscopes in the future.

Key words: SERF atomic spin gyroscope, alkali-metal vapor cell, non-magnetic heating, linear active disturbance rejection control, thermal management technology

CLC Number:

TP273

LIU Jinrong, LI Wei. Non-magnetic Heating and High-precision Temperature Control of the Alkali-metal Vapor Cell in SERF Atomic Spin Gyroscope[J]. Acta Armamentarii, 2024, 45(9): 3288-3296.

Figures/Tables 14

Fig.1 Overall design drawing of temperature control system of alkali-metal vapor cell

Fig.2 Structure of LADRC

Fig.3 Integrated 3D printing structure

Fig.4 Adiabatic structure

Table 1 3D printing materials and their thermal conductivities

3D打印材料		热导率W/(m·k)
	聚乳酸树脂	0.1~0.5
	丙烯腈-丁二烯-苯乙烯共聚物树脂	0.1~0.3
高分子丝材	R4600树脂	0.1~0.3
	聚碳酸酯树脂	0.2~0.3
	聚苯砜	0.3~0.4
	聚对苯二甲酸乙二醇酯	0.15~0.35
光敏树脂		0.1~0.3
无机非金属		1~100

Fig.5 Insulation structure design drawing

Fig.6 Experimental platform of temperature control system for alkali-metal vapor cell

Fig.7 PID temperature control curve

Fig.8 LADRC temperature control curve

Table 2 Analyzed results of temperature control data of vapor cell under different control methods

评价指标	PID控制	LADRC
最大值	180.018	180.009
最小值	179.985	179.991
极差	0.033	0.018
方差	2.789×10^-5	7.435×10^-6
标准差	0.005	0.003
平均绝对偏差	0.004	0.002

Fig.9 Temperature control curve of vapor cell loaded with ordinary grapheme

Fig.10 Temperature control curve of vapor cell loaded with high-temperature oxidized graphene

Fig.11 Temperature control curve of vapor cell without insulation structure

Fig.12 Temperature control curve of vapor cell with insulation structure

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