JPS622488B2 - - Google Patents
Info
- Publication number
- JPS622488B2 JPS622488B2 JP10857979A JP10857979A JPS622488B2 JP S622488 B2 JPS622488 B2 JP S622488B2 JP 10857979 A JP10857979 A JP 10857979A JP 10857979 A JP10857979 A JP 10857979A JP S622488 B2 JPS622488 B2 JP S622488B2
- Authority
- JP
- Japan
- Prior art keywords
- atomic
- frequency
- resonance
- signal
- oscillator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000013078 crystal Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Description
【発明の詳細な説明】 本発明は原子発振器の改良に関する。[Detailed description of the invention] The present invention relates to improvements in atomic oscillators.
従来、原子や分子の持つ共振周波数を基準とし
て水晶発振器を制御する原子発振器は、長期周波
数安定度が極めて高いため高精度周波数発生源と
して利用されている。 Conventionally, atomic oscillators, which control crystal oscillators based on the resonance frequencies of atoms and molecules, have been used as high-precision frequency generation sources because of their extremely high long-term frequency stability.
第１図に従来の原子発振器の１例としてガスセ
ル型原子発振器の構成図を示す。図において１は
原子共振器、２は電気回路部分であつて、原子共
振器１にはランプセル３、フイルタセル４、共鳴
セル５、マイクロ波共振器６および光検出器７等
が具備されている。この原子発振器の動作は電圧
制御水晶発振器８の出力を低周波発振器９により
変調し、さらに逓倍器１０、合成器１１、混合器
１２によりその周波数は原子共振周波数に合致す
るように逓倍合成し、マイクロ波共振器６を駆動
する。一方、共鳴セル５はランプセル３により光
ポンピングされているが、光検出器７による信号
の強さは第２図に示す如く原子共振周波数のとこ
ろで最小値となる曲線１３を画く。この原子共振
セル５に周波数Lで変調されたマイクロ波が加
えられると、その周波数が１４の様に原子共振周
波数よりわずかに低い場合には曲線１５の如く周
波数ＦLの信号が出力される。またマイクロ波が
１４′の様に原子共振周波数よりわずかに高いと
きは周波数ＦLで且つ信号１５と位相が180゜異な
る信号１６が出力される。またマイクロ波が１
４″の様に原子共振周波数と一致したときは曲線
１７の如く変調周波数ＦLの２倍の2FLの信号が
出力される。これらの共鳴信号１５，１６，１７
は第１図の増幅器１８で増幅され、さらに周波数
ＦLの信号１５，１６は選択増幅器１９で増幅さ
れる。次いで低周波発振器９に接続した位相検波
器２０はこの信号の位相を検出して電圧制御水晶
発振器８の周波数を原子共振周波数に一致するよ
うに制御する。また周波数２Lの信号は選択増
幅器２１で増幅され共鳴検出器２２で共鳴が監視
されるようになつている。ところがこれらの共鳴
信号L，２Lは原子共振器を構成する部品の特
性変化により経時的に変化することがある。その
ため共鳴信号レベルがある値以下に低下した場合
には原子発振器の周波数制御ループが正常に動作
しなくなり同期外れを起すことがある。本発明は
この欠点を改良するために案出されたものであ
る。 FIG. 1 shows a configuration diagram of a gas cell type atomic oscillator as an example of a conventional atomic oscillator. In the figure, 1 is an atomic resonator, 2 is an electric circuit section, and the atomic resonator 1 is equipped with a lamp cell 3, a filter cell 4, a resonance cell 5, a microwave resonator 6, a photodetector 7, and the like. The operation of this atomic oscillator is to modulate the output of a voltage-controlled crystal oscillator 8 with a low-frequency oscillator 9, and then multiply and synthesize the output using a multiplier 10, a synthesizer 11, and a mixer 12 so that the frequency matches the atomic resonance frequency. The microwave resonator 6 is driven. On the other hand, the resonant cell 5 is optically pumped by the lamp cell 3, and the intensity of the signal from the photodetector 7 draws a curve 13 having a minimum value at the atomic resonance frequency, as shown in FIG. When a microwave modulated at a frequency L is applied to the atomic resonance cell 5, a signal having a frequency F L as shown by a curve 15 is output when the frequency is slightly lower than the atomic resonance frequency as shown in 14. Further, when the microwave is slightly higher than the atomic resonance frequency as indicated by 14', a signal 16 having a frequency F L and a phase different from the signal 15 by 180° is output. Also, the microwave is 1
When the frequency matches the atomic resonance frequency like 4'', a signal of 2F L , which is twice the modulation frequency F L , is output as shown in curve 17. These resonance signals 15, 16, 17
is amplified by the amplifier 18 in FIG . Next, a phase detector 20 connected to the low frequency oscillator 9 detects the phase of this signal and controls the frequency of the voltage controlled crystal oscillator 8 to match the atomic resonance frequency. Further, a signal with a frequency of 2 L is amplified by a selection amplifier 21, and resonance is monitored by a resonance detector 22. However, these resonance signals L and 2 L may change over time due to changes in the characteristics of the components that make up the atomic resonator. Therefore, if the resonance signal level drops below a certain value, the frequency control loop of the atomic oscillator may no longer operate normally, resulting in loss of synchronization. The present invention has been devised to improve this drawback.
このため本発明においては、原子発振器におい
て、原子共振器から得られる共鳴信号のうち、変
調周波数の２倍波の信号レベルが常に一定となる
ように信号増幅器に自動利得制御回路を設けたこ
とを特徴とするものである。 Therefore, in the present invention, in the atomic oscillator, an automatic gain control circuit is provided in the signal amplifier so that the signal level of the double wave of the modulation frequency among the resonance signals obtained from the atomic resonator is always constant. This is a characteristic feature.
以下添付図面により本発明の実施例につき詳細
に説明する。 Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
第３図に実施例のブロツク図を示す。なお図の
各符号の示す意味は第１図と同様である。 FIG. 3 shows a block diagram of the embodiment. Note that the meanings of each symbol in the figure are the same as in FIG. 1.
本実施例は第１図に示した原子発振器に、更に
図の如く原子共振器１より得られる２倍波の共鳴
信号２Lの信号レベルが常に一定となるように
増幅器２１と１８との間に自動利得制御回路２３
を設けたものである。 In this embodiment, the atomic oscillator shown in FIG . Automatic gain control circuit 23
It has been established.
このように構成された本実施例は原子共振器１
よりの共鳴信号のうち２倍波２Lを増幅器１８
および選択増幅器２１で増幅する。しかるとき、
自動利得制御回路２３は選択増幅器２１の出力レ
ベルが一定となるように増幅器１８を制御する。
これにより選択増幅器１９を通る基本波信号L
も一定のレベルに増幅されるため、たとえ原子共
振器１よりの共鳴信号のレベルが低下した場合で
も位相検出器２０を介して電圧制御水晶発振器８
を制御することが可能である。なお自動利得制御
回路としては公知の回路を用いることができる。 In this embodiment configured in this way, the atomic resonator 1
The second harmonic 2 L of the resonant signal is sent to the amplifier 18
and is amplified by the selection amplifier 21. When scolded,
The automatic gain control circuit 23 controls the amplifier 18 so that the output level of the selection amplifier 21 is constant.
As a result, the fundamental wave signal L passing through the selection amplifier 19
is also amplified to a constant level, so even if the level of the resonance signal from the atomic resonator 1 decreases, the voltage-controlled crystal oscillator 8 is amplified via the phase detector 20.
It is possible to control the Note that a known circuit can be used as the automatic gain control circuit.
以上説明した如く本発明の原子発振器は原子共
振器から得られる変調波の２倍波の信号レベルが
常に一定となるように信号増幅器に自動利得制御
回路を設けることにより、共鳴信号レベルが経時
変化を起した場合、あるいは周囲温度等の環境条
件の変化により共鳴信号レベルが変化した場合で
も原子発振器の周波数制御ループを正常に動作せ
しめ、同期外れを防止し、正常動作を維持するこ
とを可能としたものである。 As explained above, in the atomic oscillator of the present invention, the resonant signal level changes over time by providing an automatic gain control circuit in the signal amplifier so that the signal level of the second harmonic of the modulated wave obtained from the atomic resonator is always constant. This enables the frequency control loop of the atomic oscillator to operate normally, prevents synchronization, and maintains normal operation even when the resonant signal level changes due to changes in environmental conditions such as ambient temperature. This is what I did.
第１図は従来の原子発振器の１例の構成図、第
２図はその原子共振器より得られる共鳴信号の説
明図、第３図は本発明にかかる実施例の原子発振
器のブロツク図である。
１……原子共振器、８……電圧制御水晶発振
器、９……低周波発振器、１０……逓倍器、１１
……合成器、１２……混合器、１８……増幅器、
１９，２１……選択増幅器、２０……位相検出
器、２２……共鳴検出器、２３……自動利得制御
回路。
FIG. 1 is a block diagram of an example of a conventional atomic oscillator, FIG. 2 is an explanatory diagram of a resonance signal obtained from the atomic resonator, and FIG. 3 is a block diagram of an atomic oscillator according to an embodiment of the present invention. . 1... Atomic resonator, 8... Voltage controlled crystal oscillator, 9... Low frequency oscillator, 10... Multiplier, 11
...Synthesizer, 12...Mixer, 18...Amplifier,
19, 21...selection amplifier, 20...phase detector, 22...resonance detector, 23...automatic gain control circuit.
Claims (1)
る共鳴信号のうち、変調周波数の２倍波の信号レ
ベルが常に一定となるように信号増幅器に自動利
得制御回路を設けたことを特徴とする原子発振
器。1. An atomic oscillator characterized in that the signal amplifier is provided with an automatic gain control circuit so that the signal level of the second harmonic of the modulation frequency among the resonance signals obtained from the atomic resonator is always constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10857979A JPS5632832A (en) | 1979-08-28 | 1979-08-28 | Atomic oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10857979A JPS5632832A (en) | 1979-08-28 | 1979-08-28 | Atomic oscillator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5632832A JPS5632832A (en) | 1981-04-02 |
| JPS622488B2 true JPS622488B2 (en) | 1987-01-20 |
Family
ID=14488384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10857979A Granted JPS5632832A (en) | 1979-08-28 | 1979-08-28 | Atomic oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5632832A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018101886A (en) | 2016-12-20 | 2018-06-28 | セイコーエプソン株式会社 | Quantum interference device, atomic oscillator, electronic equipment and mobile object |
-
1979
- 1979-08-28 JP JP10857979A patent/JPS5632832A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5632832A (en) | 1981-04-02 |
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