用于高温高压井下的光纤传感器
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十一五国家重大科技专项2008ZX05024-004-013智能完井关键技术


Fiber optic pressure and temperature sensors for oil down hole application
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    摘要:

    本文详细介绍了光纤传感器在恶劣环境的井下的应用。传感头部分是基于干涉原理的光纤传感器,它的腔体长度会随着压力和温度发生变化。为了提高测量速度,一种以自校正(SCIIB)原理为基础的干涉方法被应用到压力(或温度)信号的解调,这种方式能够针对白光漂移以及光纤损失的变化实现补偿。这种系统应用到传感器的制作当中,解调系统可以提供非常高的分辨率。实验结果显示,当压力传感器在0~8000psi范围内工作,温度传感器在0~600℃范围工作时,这种SCIIB系统能够达到0.1%的准确度。白光系统的分辨率大约在?.5nm,动态变化范围在10微米。井下长期的测试结果在文中也有提及。

    Abstract:

    Detailed studies on fiber optic pressure and temperature sensors for oil down-hole applications are described in this paper. The sensor head is an interferometric based fiber optic senor in which the air-gap will change with the pressure or temperature. For high-speed applications, a novel self-calibrating interferometric/intensity-based (SCIIB) scheme, which realizes compensations for both the light source drift and the fiber loss variation, was used to demodulate the pressure (or temperature) signals. An improved white light system was developed for sensor fabrication. This system is also used as the signal demodulation system providing very high resolution. Experiment results show that the SCIIB system achieves 0.1% accuracy with a 0-8000psi working range for the pressure sensor and a 0-600?C working range for the temperature sensor. The resolution of the white light system is about ?.5 nm with a dynamic range up to 10 micrometers. The long –term testing results in the oil site are also presented in this paper.

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赵婷. 用于高温高压井下的光纤传感器[J]. 科学技术与工程, 2010, (31): .
zhaoting. Fiber optic pressure and temperature sensors for oil down hole application[J]. Science Technology and Engineering,2010,(31).

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历史
  • 收稿日期:2010-08-03
  • 最后修改日期:2010-08-17
  • 录用日期:2010-08-19
  • 在线发布日期: 2010-09-29
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