Self-tuning method and device for temperature control parameters of passive CPT (Coherent Population Trapping) atomic clock

Abstract

The invention discloses a self-tuning method for temperature control parameters of a passive CPT (Coherent Population Trapping) atomic clock. The method comprises the following steps of: acquiring digital temperature information of an atomic vapor bubble and a VCSEL (Vertical Cavity Surface Emitting Laser); carrying out PID (Proportion Integration Differentiation) operations on difference values between the digital temperature information which is subjected to filtering processing and digital quantities corresponding to temperature set points; carrying out PWM (Pulse Width Modulation) and delta-sigma modulation on a result obtained after the PID operations, and then, outputting the result to a peripheral circuit for heating and refrigerating; and self-tuning temperature control PID parameters of the atomic vapor bubble and the VCSEL. The invention further discloses a self-tuning device for the temperature control parameters of the passive CPT atomic clock. The method and the device have the advantages that the full-duplex communication between the passive CPT atomic clock and an upper computer is realized, the self-tuning of the temperature control PID parameters can be carried out, the accuracy of regulation of temperature control is improved, the power consumption is low, and the accuracy is high.

Description

technical field [0001] The invention belongs to the field of atomic clocks, and in particular relates to a temperature control parameter self-tuning method of a passive CPT atomic clock and also relates to a temperature control parameter self-tuning device of a passive CPT atomic clock, which is suitable for a passive CPT atomic clock. Background technique [0002] Passive CPT atomic clock is a kind of atomic clock based on the CPT resonance phenomenon generated by the interaction between coherent dichromatic light and atoms. It has been developed rapidly due to its obvious advantages in power consumption and volume. The passive CPT atomic clock is mainly composed of four parts: physical system, microwave system, servo system and temperature control system. The physical system is the core component of the passive CPT atomic clock, which is mainly composed of atomic vapor bubbles, VCSELs, and photodetectors. The more stable the temperature of the atomic vapor bubble and the ...

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Problems solved by technology

[0003] At present, a variety of temperature control system solutions have been applied to atomic clocks. The power consumption and volume of the temperature control system realized by analog circuits are relatively large and difficult to adjust. It is not suitable for passive CPT atomic clocks with small volume and low power consumption. Commonly used The digital temperature control circuit has problems such as difficult adjustment of control parameters, low signal-to-noise ratio of collected signals, and low temperature control accuracy.

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