Special Purpose Ammonia Frequency Standard a Feasibility Study
| Autor: | David A. Howe, Helmut Hellwig, Michael B. Mohler, David J. Wineland |
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| Rok vydání: | 1979 |
| Předmět: | |
| Zdroj: | IEEE Transactions on Instrumentation and Measurement. 28:122-132 |
| ISSN: | 1557-9662 0018-9456 |
| DOI: | 10.1109/tim.1979.4314780 |
| Popis: | We have investigated the feasibility of a special purpose frequency standard based on microwave absorption in ammonia gas (N15H3). Such a device would potentially fill a need in certain communications and navigation applications for an oscillator which has medium stability, greater accuracy (~10-9) than that provided by crystal oscillators, but a cost significantly smaller than that of more sophisticated atomic frequency standards. A device was constructed using a stripline oscillator near 0.5 GHz whose multiplied output was frequency-locked to the absorption of the 3-3 line in N15H3 (~22.8 GHz). Output between 5 and 10 MHz was provided by direct division from the 0.5-GHz oscillator. Observed stability was 2 x 10-10 from 10 to 6000 s, and reproducibility (accuracy) is estimated to be ±2 x 10-9. The unique features of this device, which include 1) high-performance stripline oscillator, 2) digital servo techniques, 3) unique oscillator-cavity servo, 4) pressure shift compensation scheme, and 5) acceleration insensitivity, are discussed. Areas for further study are noted. |
| Databáze: | OpenAIRE |
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