CN-121994353-A - Pi pulse time automatic identification method for mercury ion microwave clock

CN121994353ACN 121994353 ACN121994353 ACN 121994353ACN-121994353-A

Abstract

The invention discloses an automatic identification method of pi pulse time of a mercury ion microwave clock, which comprises the steps of setting time sequence, carrying out switching operation on external equipment according to a specified time sequence, collecting fluorescent signals, carrying out fluorescent signal collection by utilizing a singlechip, carrying out transition probability scanning, setting microwave source point frequency, microwave action starting time, microwave action stopping time and microwave action time step by step, using an external reference source as a reference signal, carrying out transition probability scanning in a Rabi mode to obtain a transition probability scanning curve, carrying out nonlinear fitting on data based on transition probability spectral lines, drawing a new transition probability function curve, obtaining a new transition probability function derivative, further confirming pi pulse range and identifying pi pulses. The method has the advantages of full-automatic operation, high intelligent identification precision and good system flexibility, improves the experimental efficiency and reduces the experimental error.

Inventors

PAN YAN
WANG NUANRANG
ZHANG SHENGKANG
XUE XIAOBO
GE JUN

Assignees

北京无线电计量测试研究所

Dates

Publication Date: 20260508
Application Date: 20251226

Claims (2)

1. A pi pulse time automatic identification method of a mercury ion microwave clock, the method comprising: The method comprises the steps that time sequence setting, external equipment needs to conduct switching operation according to a specified time sequence, and all the switching operation is preset, generated and executed by a singlechip; collecting fluorescent signals to obtain a transition probability scanning curve, collecting fluorescent signals by using the singlechip, Setting a microwave source point frequency, a microwave action starting time, a microwave action stopping time and a microwave action time step, using an external reference source as a reference signal, and executing fluorescent signal transition probability scanning in a Rabi mode according to the preset microwave source point frequency, the microwave action starting time, the microwave action stopping time and the microwave action time step and the running time sequence to obtain a fluorescent signal transition probability scanning curve; Confirming a pi pulse range, carrying out nonlinear fitting on data according to the transition probability scanning curve to obtain a new transition probability function, and calculating a derivative of the new transition probability function, wherein the derivative is in a sine function form Asinb tau/2, A is a proportionality coefficient, b is a transition probability change frequency, tau is a microwave action time, when btau is positioned in [0, pi ], the derivative is positive, when btau is positioned in [ pi, 2 pi ], the derivative is negative, and in the [0, 2 pi ], the derivative must take a value of 0; And identifying pi pulses, and determining the pi pulse time as the time when the derivative is 0 and the original function, namely the transition probability function, reaches the peak value of the first period in the interval of which the original function is an increasing function according to the pi pulse range.
2. The method for automatically identifying pi pulse time of a mercury ion microwave clock according to claim 1, wherein in the time sequence setting, the external device needs to perform a switching operation according to a specified time sequence, and the method specifically comprises: the external devices include an electron gun, a spectrum lamp, a microwave source, and a photomultiplier PMT.

Description

Pi pulse time automatic identification method for mercury ion microwave clock Technical Field The invention relates to the technical field of microwave frequency labels, in particular to an automatic pi pulse time identification method of a mercury ion microwave clock. Background The mercury ion microwave frequency standard is a novel frequency standard, adopts a brand-new working principle different from the traditional atomic frequency standard such as hydrogen, rubidium, cesium and the like, and has the characteristics of extremely strong anti-interference capability on physical particles and outfield disturbance, extremely small influence of motion effect and remarkably prolonged quantum state coherence time. On the hardware architecture, the mercury ion microwave frequency standard system adopts a highly integrated design, and the collection and the processing of fluorescent signals can be completed only by a single singlechip. The mercury ion microwave frequency standard comprises a microwave source, a voltage-controlled crystal oscillator and a trapping ion field, and when the system works, the microwave source directly acts on the trapping ion field, so that mercury ions generate transition to generate fluorescent signals. Firstly, an external reference source is used as a reference signal, and an ion field is scanned by precisely regulating and controlling the output frequency of a microwave source, so that an atomic transition signal, namely a fluorescent signal spectral line, is obtained. In order to optimize spectral line performance, the system adopts a Rabi detection scanning technology, and the cooperative work of all external devices is controlled through accurate time sequence. The pi pulse time is an important parameter for realizing high-precision frequency standard of the mercury ion microwave clock, and in practical application, the pulse intensity and time are balanced to achieve the best performance through experimental calibration, and experiments show that when the microwave action time is set to be pi pulse time, the best transition signal spectral line can be obtained. The traditional technology relies on manual observation of transition probability spectral lines under different microwave action time to determine pi pulse time, but the precision and efficiency are insufficient. Disclosure of Invention Aiming at the problems, the invention provides a method capable of automatically identifying pi pulse time of a mercury ion microwave clock, which realizes automatic identification of transition probability spectral lines and can accurately and efficiently determine the optimal pi pulse time of a system. In a first aspect, the present invention provides a method for automatically identifying pi pulse time of a mercury ion microwave clock, the method comprising: The method comprises the steps that time sequence setting, external equipment needs to conduct switching operation according to a specified time sequence, and all the switching operation is preset, generated and executed by a singlechip; Collecting fluorescent signals to obtain a transition probability scanning curve, collecting the fluorescent signals by using the singlechip, setting a microwave source point frequency, a microwave action starting time, a microwave action stopping time and a microwave action time step, using an external reference source as a reference signal, and executing fluorescent signal transition probability scanning in a Rabi mode according to the preset microwave source point frequency, the microwave action starting time, the microwave action stopping time and the microwave action time step and operation time sequence to obtain a fluorescent signal transition probability scanning curve; Confirming a pi pulse range, carrying out nonlinear fitting on data according to the transition probability scanning curve to obtain a new transition probability function, and calculating a derivative of the new transition probability function, wherein the derivative is in a sine function form Asinb tau/2, A is a proportionality coefficient, b is a transition probability change frequency, tau is a microwave action time, when btau is positioned in [0, pi ], the derivative is positive, when btau is positioned in [ pi, 2 pi ], the derivative is negative, and in the [0,2 pi ], the derivative must take a value of 0; And identifying pi pulses, and determining the pi pulse time as the time when the derivative is 0 and the original function, namely the transition probability function, reaches the peak value of the first period in the interval of which the original function is an increasing function according to the pi pulse range. In some embodiments, in the timing setting, the external device needs to perform a switching operation according to a specified timing, which specifically includes: The external equipment comprises an electron gun, a spectrum lamp, a microwave source and a photomultiplier PMT, and the specified time