DDS (Direct Digital Frequency Synthesizer) frequency hopping device used for laser time sequence control of cold atom interferometer

A timing control and interferometer technology, which is applied in the direction of instruments, electrical digital data processing, digital data processing components, etc., can solve complex problems, DDS signal source phase noise level and phase continuity are not high, signal source frequency time Interval can not be set and other problems, to achieve the effect of improving the level of phase noise, easy and practical operation

Active Publication Date: 2017-05-10
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The current existing technology has the disadvantages that the signal source frequency and time interval cannot be set, the DDS signal source phase noise level and phase continuity and other indicators are not high, and the scheme adopted by the timing control is relatively complicated to use

Method used

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  • DDS (Direct Digital Frequency Synthesizer) frequency hopping device used for laser time sequence control of cold atom interferometer
  • DDS (Direct Digital Frequency Synthesizer) frequency hopping device used for laser time sequence control of cold atom interferometer
  • DDS (Direct Digital Frequency Synthesizer) frequency hopping device used for laser time sequence control of cold atom interferometer

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Embodiment 1

[0037] Embodiment 1 The DDS frequency hopping device used for the laser timing control of the cold atom interferometer according to the present invention, the device includes:

[0038] The host computer 1 is used to set the frequency hopping frequency and the time interval of the frequency hopping frequency, and the control program of the host computer is written by LABVIEW;

[0039]ARM chip 2 is used to obtain the frequency hopping frequency word and time interval passed by the control program LABVIEW of the upper computer, convert it into a corresponding frequency word and pass it to the complex programmable logic device CPLD chip through the SPI interface;

[0040] The CPLD chip 3 is used to obtain the frequency word transmitted by the ARM chip, transmit the frequency word to the DDS chip through the SPI interface, and initialize the amplitude and phase of the output frequency;

[0041] The DDS chip 4 is used to obtain the frequency word delivered by the CPLD chip, and send...

Embodiment 2

[0056] Embodiment 2 The technical scheme adopted in the present invention: refer to figure 1 , figure 1 It is the schematic diagram of the DDS frequency hopping device controlled by the laser timing control of the cold atom interferometer. The control of the host computer is the schematic diagram of the ultra-low frequency vibration isolation system of the cold atom interferometer using LABVIEW. The program of the host computer is written by the software of LABVIEW. The software of LABVIEW is made by Developed by National Instruments (NI), compared with other computer programming languages, its characteristics are: LABVIEW software adopts the graphical programming program G language, and the generated programs are mostly in the form of block diagrams. The control program of the host computer is written by LABVIEW. It mainly implements setting the frequency of frequency hopping and the time interval of frequency. Setting the frequency of frequency hopping is mainly used for at...

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Abstract

The invention relates to a DDS (Direct Digital Frequency Synthesizer) frequency hopping device used for the laser time sequence control of a cold atom interferometer. The device comprises an upper computer with a LABVIEW control program, an ARM (Advanced RISC Machines) chip, a CPLD (Complex Programmable Logic Device) chip, a rubydium atomic clock, a radio frequency chip and a DDS chip. The setting of frequencies required for the atomic velocity selection and the microwave frequency mixing of the cold atom interferometer as well as for an atomic wave packet to carry out beam splitting, inversion and beam combination under a function of a [Pi]/2-[Pi]-[Pi]/2 Raman pulse sequence can be realized. The device adopts the following methods that the rubidium atomic clock is used for replacing a common quartz crystal oscillator, and the reference crystal oscillator of the complex programmable logic device chip and the reference crystal oscillator of the DDS chip use the same radio frequency source. Compared with a traditional DDS frequency hopping device, the device disclosed by the invention is characterized in that the setting of the frequencies of different hopping frequencies and frequency time intervals can be realized, and the device exhibits a higher phase noise level and higher phase continuity on an aspect of output frequency switching.

Description

technical field [0001] The invention relates to a DDS frequency hopping device used for laser timing control of a cold atom interferometer. Background technique [0002] The cold atom interferometer utilizes the small velocity and velocity distribution and good coherence of cold atomic clusters. The free-falling cold atomic clusters are used as the test mass, and lasers are used to manipulate cold atoms to achieve matter wave interference to obtain the gravity of the falling area of ​​cold atoms. The magnitude of the acceleration. The cold atom interferometer is mainly based on the stimulated Raman transition (SRT) of two photons to change the energy state inside the atom, split, reverse and combine the beams of the atoms, and finally form interference. 87 Rb atoms are first loaded in the three-dimensional magneto-optical trap, Rb is rubidium atom, 87 is the isotope of rubidium atom, and it is cooled to 4μk before free falling. k is the thermodynamic temperature Kelvin, μk...

Claims

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Application Information

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IPC IPC(8): G06F1/03
CPCG06F1/0321
Inventor 罗东云程冰吴彬林强
Owner ZHEJIANG UNIV OF TECH
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