The development of wavelength filtering devices and beam shapers in glass and polymer optical fibers, using inscription with a femtosecond laser, is reported.By using a femtosecond laser operating in
In this paper we report the field test results and analysis of eight-element fiber laser geophone array system in Shengli oilfield.Seismic signals are acquired simultaneously by fiber laser geophones
In order to improve the precision characteristic of detonation velocity instrument and enhance the accuracy property of ammunition speed test in defense field, a high-precision intelligent detonation
随着常规石油资源越来越少,国内外各大石油公司都加大了稠油热力开采的投入.国内的稠油油藏开发方式也正逐渐由蒸汽吞吐转向双水平井蒸汽辅助重力泄油.上述开采工艺的效果严重依赖于对井和油藏的动态监测能力,而能够满足上述动态监测需求的最佳手段就是光纤生产监测及解释.光纤监测及解释技术能够综合多种光纤传感器的测量结果,长期实时监测稠油热采井下温度、压力及其变化情况,来分析和解释不同油层部位的动用情况,为稠油热
We report our recent studies on evanescent-field-based photonic microcells (PMCs) made by post-processing commercial micro-structured optical fibers, and by encapsulating tapered micro/nano-fibers wit
Refractive index (RI) sensing of liquids is significant for chemical and biochemical applications in industry,environment and food safety monitoring, etc.Here we propose a novel RI sensor based on a h
We measure the phase noise and linewidth of 6 asymmetrical Distributed FeedBack Fiber Lasers (DFB FL) using unbalanced Michelson interferometer and delayed self-homodyne method respectively.Test resul
Laser ultrasonic (LU) three-dimensional (3D) imaging system combining wavelet threshold method (WTM) is presented, in which a laser beam is as a scanner and an interferometer is as a receiver.The ultr
A distributed acoustic sensing (DAS) scheme is presented.Rayleigh backscattered light which contains acoustic signal induced phase changes along the sensing fiber is fed into a balance Michelson inter
针对基于布里渊散射的光纤分布式温度、应变交叉敏感的问题,分析了采用拉曼分布式测温结果对应变测量进行补偿的可行性,并利用OZ optics公司的布里渊分布式温度应变监测仪器和最大测量误差小于1℃的单模光纤分布式测温仪器开展实验验证.实验结果表明,采用单模DTS测温结果对基于布里渊散射的应变测量结果进行补偿,可有效消除温度变化引起的测量误差,确保应变测量精度,应变测量系统误差可控制在50uε左右,测量