A method for controlling the air chamber temperature of a SERF inertial measurement device based on second harmonic

By using the second harmonic signal feedback to regulate the power of the heating laser in the SERF inertial measurement unit, the magnetic field interference and temperature control hysteresis problems introduced by the thermal resistor are solved, and magnetic-free heating and high-sensitivity gas chamber temperature control are achieved.

CN115542977BActive Publication Date: 2025-09-26ZHEJIANG LAB
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Patent Information

Application Number
CN202211124164.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-09-15
Publication Date
2025-09-26
Estimated Expiration
2042-09-15

AI Technical Summary

Technical Problem

In existing SERF inertial measurement devices, the magnetic field interference and low-frequency magnetic field noise introduced by the thermistor as a temperature sensor affect the sensitivity of the device, and there is a lag in temperature control, making it difficult to achieve truly non-magnetic all-optical gas chamber heating and its control.

Method used

By utilizing the SERF device's own detection system and adjusting the power of the heating laser through second harmonic signal feedback, real-time and stable control of the temperature and atomic density of the alkali metal gas chamber is achieved, avoiding the magnetic field interference introduced by the thermal resistor, and using optical depth as the feedback signal.

Benefits of technology

The real non-magnetic heating of the SERF inertial measurement device is realized, the sensitivity of the device is improved, the hysteresis of temperature control is reduced, and the accuracy of signal detection is enhanced.

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Abstract

The present invention discloses a gas chamber temperature control method for a SERF inertial measurement device based on second harmonic generation. The method utilizes gas chamber optical depth information obtained by the SERF device's own detection system to perform feedback regulation on the laser heating power of the atomic gas chamber, thereby achieving real-time and stable control of the atomic density or temperature in the gas chamber. This avoids the magnetic field interference introduced by the use of thermal resistors as temperature sensors in existing solutions, thereby achieving truly non-magnetic, all-optical gas chamber heating and its control system, and helping to improve the sensitivity of the SERF inertial measurement device.
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