CN110120812B - Raman transition frequency generating device for cold atom interference type gravimeter - Google Patents
Raman transition frequency generating device for cold atom interference type gravimeter Download PDFInfo
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- CN110120812B CN110120812B CN201910482152.2A CN201910482152A CN110120812B CN 110120812 B CN110120812 B CN 110120812B CN 201910482152 A CN201910482152 A CN 201910482152A CN 110120812 B CN110120812 B CN 110120812B
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- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 11
- 230000007704 transition Effects 0.000 title claims abstract description 10
- 230000004044 response Effects 0.000 abstract description 3
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/26—Automatic control of frequency or phase; Synchronisation using energy levels of molecules, atoms, or subatomic particles as a frequency reference
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Abstract
The Raman transition frequency generating device for the cold atom interference type gravimeter comprises a high-frequency signal generating circuit unit, a low-frequency signal generating circuit unit and a difference frequency signal circuit unit; the high-frequency signal generating circuit unit modulates and outputs a high-frequency high-power signal, and comprises an atomic clock of a signal input port, a first one-to-four power divider, a high-frequency oscillator and a second one-to-four power divider; the low-frequency signal generating circuit unit outputs a modulated low-frequency signal, wherein the modulated low-frequency signal comprises a direct digital frequency synthesizer DDS, a frequency doubler, a first amplifier, a band-pass filter and a switching difference frequency signal circuit unit, the first high-frequency signal and the second low-frequency signal are mixed, and finally electromagnetic waves with specific frequency and power are output, and the frequency doubler comprises a mixer, a second band-pass filter, a second amplifier, an isolator and a one-to-two power divider. The invention has the advantages of high stability, quick response, various output functions, light volume, strong compatibility, relatively low use cost and the like.
Description
Technical Field
The invention relates to the technical field of microwave radio frequency, in particular to a specific frequency required by Raman transition of cold atoms under the action of electromagnetic waves in a cold atom interference type gravimeter.
Background
Raman transitions of ultra-low temperature atoms are an important part of cold atom interferometer gravimeter implementations, and raman transitions have special requirements on the frequency and power of electromagnetic waves.
In the implementation process, the high frequency needs to be mixed with a specific frequency to be locked at an atomic transition resonance frequency point, and the frequency point is a very critical part in the raman mode selection. However, the existing commercial radio frequency module has slow response speed, poor stability, single function, excessively heavy whole and high use cost to the Raman state selection in the cold atom interference type gravimeter.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a Raman transition frequency generating device for a cold atom interference type gravimeter, which has stable performance, strong compatibility and low use cost.
The invention provides a Raman transition frequency generating device for a cold atom interference type gravimeter, which mainly comprises the following functional units: a high-frequency signal generating circuit unit 1, a low-frequency signal generating circuit unit 2, and a difference-frequency signal circuit unit 3.
The high-frequency signal generating circuit unit 1 modulates and outputs a high-frequency high-power signal including an atomic clock of a signal input port, a first quarter-power divider, a high-frequency oscillator, and a second quarter-power divider. The output end of the atomic clock at the signal input end is connected with the first pin of the first quarter-wave divider, the second end of the first quarter-wave divider is connected with the first end of the 7GHz high-frequency oscillator, the third end, the fourth end and the fifth end of the first quarter-wave divider are externally connected for output, the second end of the 7GHz high-frequency oscillator is connected with the first end of the second quarter-wave divider, the second end of the second quarter-wave divider is connected with the first end of the mixer of the difference frequency signal circuit unit 3, and the third end, the fourth end and the fifth end of the first quarter-wave divider are externally connected for output.
The low frequency signal generating circuit unit 2 outputs a modulated low frequency signal, which includes a direct digital frequency synthesizer DDS, a frequency doubler, a first amplifier, a band pass filter, and a switch. The low-frequency signal from the DDS is connected with the first end of the frequency multiplier, the second end of the frequency multiplier is connected with the first end of the first amplifier, the second end of the frequency multiplier is connected with the first end of the first band-pass filter, the second end of the first band-pass filter is connected with the first end of the switch, and the second end of the switch is connected with the second end of the frequency mixer of the difference frequency signal circuit unit 3.
The difference frequency signal circuit unit 3 mixes the first high frequency signal with the second low frequency signal and finally outputs electromagnetic waves with specific frequency and power, wherein the electromagnetic waves comprise a mixer, a second band-pass filter, a second amplifier, an isolator and a one-to-two power divider. The third end of the mixer is connected with the first end of the band-pass filter, the second end of the band-pass filter is connected with the first end of the isolator, the second end of the isolator is connected with the first end of the one-to-two power divider, and the second end of the one-to-two power divider finally outputs microwaves with two paths of resonance frequencies.
The invention has the advantages that: the microwave oven can rapidly provide stable microwaves with specific frequency in the cold atom interference type gravimeter, and has the advantages of high stability, quick response, various output functions, light volume, strong compatibility, relatively low use cost and the like.
Drawings
FIG. 1 is a block diagram of the structural elements of the present invention;
FIG. 2 is a schematic diagram of the design of the present invention;
fig. 2a is an enlarged view of the high-frequency signal generating circuit unit 1;
Fig. 2b is an enlarged view of the self-made low frequency signal generating circuit unit 2;
Fig. 2c is an enlarged view of the difference frequency signal circuit unit 3.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 and 2, fig. 2a, fig. 2b, fig. 2c, the high-frequency microwave generator for a cold atom interference type gravimeter of the present invention includes a high-frequency signal generating circuit unit 1, a low-frequency signal generating circuit unit 2, and a difference frequency signal circuit unit 3 connected in sequence.
The high-frequency signal generating circuit unit 1 modulates and outputs a high-frequency high-power signal including an atomic clock of a signal input port, a first quarter-power divider, a high-frequency oscillator, and a second quarter-power divider. The output end of the atomic clock at the signal input end is connected with a first pin of a first one-to-four power divider, a second end of the first one-to-four power divider is connected with a first end of a high-frequency oscillator, and a third end, a fourth end and a fifth end are externally connected and output; the second end of the high-frequency oscillator is connected with the first end of the second quarter-power divider, the second end of the second quarter-power divider is connected with the first end of the mixer of the resonant frequency signal mixing circuit unit 3, and the third, fourth and fifth ends are externally connected and output.
The low frequency signal generating circuit unit 2 outputs a modulated low frequency signal, which includes a direct digital frequency synthesizer DDS, a frequency doubler, a first amplifier, a band pass filter, and a switch. The low-frequency signal from the DDS is connected with the first end of the frequency multiplier, the second end of the frequency multiplier is connected with the first end of the first amplifier, the second end of the frequency multiplier is connected with the first end of the first band-pass filter, the second end of the first band-pass filter is connected with the first end of the switch, and the second end of the switch is connected with the second end of the frequency mixer of the difference frequency signal circuit unit 3.
The difference frequency signal circuit unit 3 mixes the first high frequency signal with the second low frequency signal and finally outputs electromagnetic waves with specific frequency and power, wherein the electromagnetic waves comprise a mixer, a second band-pass filter, a second amplifier, an isolator and a one-to-two power divider. The signal output after the mixer is a difference frequency signal, the third end of the mixer is connected with the first end of the band-pass filter, the second end of the band-pass filter is connected with the first end of the isolator, the second end of the isolator is connected with the first end of the one-to-two power divider, and the second end of the one-to-two power divider finally outputs two paths of difference frequency microwave signals.
The signals output by the atomic clock are sent to the high-frequency oscillator through the coaxial cable to output high-frequency signals, then the high-frequency signals and the low-frequency signals output by the DDS are mixed after frequency multiplication, and finally stable difference frequency microwave signals are output. The high-frequency and low-frequency signals are output outwards through the power divider, so that the output singleization of the module is avoided, the filter after the DDS output, the isolator and the filter after the mixing are completed, the finally output signals are more stable, the bandwidth is narrower, and the signal to noise ratio is higher.
The embodiments described in the present specification are merely examples of implementation forms of the inventive concept, and the scope of protection of the present invention should not be construed as being limited to the specific forms set forth in the embodiments, and the scope of protection of the present invention and equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.
Claims (1)
1. The Raman transition frequency generating device for the cold atom interference type gravimeter comprises a high-frequency signal generating circuit unit (1), a low-frequency signal generating circuit unit (2) and a difference frequency signal circuit unit (3);
The high-frequency signal generating circuit unit (1) modulates and outputs a high-frequency high-power signal, and comprises an atomic clock of a signal input port, a first quarter-power divider, a high-frequency oscillator and a second quarter-power divider; the output end of the atomic clock at the signal input end is connected with a first pin of a first quarter-wave divider, a second end of the first quarter-wave divider is connected with a first end of a 7GHz high-frequency oscillator, the third end, the fourth end and the fifth end of the first quarter-wave divider are externally connected for output, a second end of the 7GHz high-frequency oscillator is connected with a first end of a second quarter-wave divider, a second end of the second quarter-wave divider is connected with a first end of a mixer of a difference frequency signal circuit unit (3), and the third end, the fourth end and the fifth end of the first quarter-wave divider are externally connected for output;
The low-frequency signal generating circuit unit (2) outputs a modulated low-frequency signal, wherein the modulated low-frequency signal comprises a direct digital frequency synthesizer DDS, a frequency doubler, a first amplifier, a band-pass filter and a switch; the low-frequency signal from the DDS is connected with a first end of a frequency multiplier, a second end of the frequency multiplier is connected with a first end of a first amplifier, a second end of the frequency multiplier is connected with a first end of a first band-pass filter, a second end of the first band-pass filter is connected with a first end of a switch, and a second end of the switch is connected with a second end of a frequency mixer of a difference frequency signal circuit unit (3);
The difference frequency signal circuit unit (3) mixes the first high-frequency signal and the second low-frequency signal and finally outputs electromagnetic waves with specific frequency and power, wherein the difference frequency signal circuit unit comprises a mixer, a second band-pass filter, a second amplifier, an isolator and a one-to-two power divider; the third end of the mixer is connected with the first end of the band-pass filter, the second end of the band-pass filter is connected with the first end of the isolator, the second end of the isolator is connected with the first end of the one-to-two power divider, and the second end of the one-to-two power divider finally outputs microwaves with two paths of resonance frequencies.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910482152.2A CN110120812B (en) | 2019-06-04 | 2019-06-04 | Raman transition frequency generating device for cold atom interference type gravimeter |
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| CN201910482152.2A CN110120812B (en) | 2019-06-04 | 2019-06-04 | Raman transition frequency generating device for cold atom interference type gravimeter |
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| CN110120812B true CN110120812B (en) | 2024-05-03 |
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| CN113471807B (en) * | 2021-09-01 | 2021-12-24 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Raman optical pulse power stabilizing system for cold atom interferometer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957425A (en) * | 2012-10-08 | 2013-03-06 | 中国计量科学研究院 | Atomic transition motivation device and method |
| CN106647926A (en) * | 2016-11-18 | 2017-05-10 | 浙江工业大学 | DDS (Direct Digital Frequency Synthesizer) frequency hopping device used for laser time sequence control of cold atom interferometer |
| CN109818249A (en) * | 2018-12-13 | 2019-05-28 | 江汉大学 | Device based on cold atom laser circuit |
| CN210111977U (en) * | 2019-06-04 | 2020-02-21 | 浙江工业大学 | Raman transition frequency generation device for cold atom interference type gravimeter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005109619A (en) * | 2003-09-29 | 2005-04-21 | Fujitsu Ltd | Atomic oscillator |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957425A (en) * | 2012-10-08 | 2013-03-06 | 中国计量科学研究院 | Atomic transition motivation device and method |
| CN106647926A (en) * | 2016-11-18 | 2017-05-10 | 浙江工业大学 | DDS (Direct Digital Frequency Synthesizer) frequency hopping device used for laser time sequence control of cold atom interferometer |
| CN109818249A (en) * | 2018-12-13 | 2019-05-28 | 江汉大学 | Device based on cold atom laser circuit |
| CN210111977U (en) * | 2019-06-04 | 2020-02-21 | 浙江工业大学 | Raman transition frequency generation device for cold atom interference type gravimeter |
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