发明名称 |
Self-compensating ovenized clock adapted for wellbore applications |
摘要 |
A clock system is disclosed which includes a dual mode oscillator crystal having a first output having a frequency related to a temperature of the oscillator crystal and a second output having a frequency substantially stable with respect to temperature. The clock includes a temperature maintenance device. The temperature maintenance device and the oscillator crystal are disposed in a thermally insulated chamber. The clock includes a processor operatively coupled to the temperature maintenance device and the oscillator crystal. The processor is adapted to operate the temperature maintenance device so as to maintain a temperature of the chamber within a predetermined range. The processor is adapted to calculate a substantially constant frequency clock signal from the second output and a ratio of the frequency of the first output with respect to the frequency of the second output.
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申请公布号 |
US6606009(B2) |
申请公布日期 |
2003.08.12 |
申请号 |
US20010028630 |
申请日期 |
2001.12.20 |
申请人 |
SCHLUMBERGER TECHNOLOGY CORPORATION |
发明人 |
GUNAWARDANA RUVINDA;ESMERSOY CENGIZ |
分类号 |
H03L1/02;H03L1/04;(IPC1-7):H03L1/00 |
主分类号 |
H03L1/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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