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    • 1. 发明申请
    • Downhole clock
    • 井下时钟
    • US20050012561A1
    • 2005-01-20
    • US10622557
    • 2003-07-18
    • David YoungCarl RobbinsEugene Linyaev
    • David YoungCarl RobbinsEugene Linyaev
    • H03L1/02H03L1/04H03L1/00
    • H03L1/04H03L1/022
    • A downhole crystal-based clock that is substantially insensitive to the factors that may cause frequency deviation as a result of downhole temperature. The clock may include a plurality of crystals, where a first crystal may be more stable, with respect to temperature, than a second crystal. The crystals may be thermally coupled together so that they may have substantially the same temperature. An error detector may monitor the differences between the frequencies associated with each crystal and provide this information to a storage device. This information may be determined prior to deploying the clock downhole. When deployed downhole, the signal from the error detector may be interpreted in light of the information in the storage device to provide a temperature measurement of the two crystals. The downhole temperature measurement then may be used to reduce frequency deviations in the downhole clock that may result from downhole temperatures.
    • 基于井下晶体的时钟,对由于井下温度可能引起频率偏差的因素基本上不敏感。 时钟可以包括多个晶体,其中第一晶体相对于温度可以比第二晶体更稳定。 晶体可以热耦合在一起,使得它们可以具有基本上相同的温度。 误差检测器可以监视与每个晶体相关联的频率之间的差异,并将该信息提供给存储设备。 该信息可以在井下部署时钟之前确定。 当部署在井下时,来自误差检测器的信号可以根据存储装置中的信息来解释,以提供两个晶体的温度测量。 然后可以使用井下温度测量来减少可能由井下温度引起的井下时钟的频率偏差。