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公开(公告)号:US06137573A
公开(公告)日:2000-10-24
申请号:US142860
申请日:1998-09-16
申请人: David G Luke , Roy McBride , Peter A Lloyd , James G Burnett , Alan H Greenaway , Julian D C Jones
发明人: David G Luke , Roy McBride , Peter A Lloyd , James G Burnett , Alan H Greenaway , Julian D C Jones
CPC分类号: G01K11/32 , G01D5/35303 , G01D5/35316 , G01D5/35383 , G01D5/35387 , G01L1/242
摘要: A sensor system (10) incorporating an interferometer operates as an optical strain gauge. The system (10) is arranged to generate interferograms characterised by an optical path difference between light traversing a sensor arm (12) of the interferometer and light traversing a reference arm (58). Each arm incorporates a highly birefringent optical fibre (38, 58) capable of supporting light propagation at two velocities in two different polarisation modes. A first interferogram is generated between light coupled into the fast eigenmodes of each fibre and a second is generated between light coupled into the slow eigenmodes. Mean optical group delay (.tau..sub.MGD) and differential optical group delay (.tau..sub.DGD) of these interferograms are affected differently by temperature and strain and thus provide a means of discriminating between these attributes of the sensor environment. Thus simultaneous measurement of strain and temperature is achieved.
摘要翻译: PCT No.PCT / GB97 / 00807 Sec。 371日期:1998年9月16日 102(e)日期1998年9月16日PCT 1997年3月24日PCT公布。 出版物WO97 / 37197 日期1997年10月9日包含干涉仪的传感器系统(10)作为光学应变计工作。 系统(10)被布置成产生干涉图,其特征在于穿过干涉仪的传感器臂(12)的光与穿过参考臂(58)的光之间的光程差。 每个臂包含能够以两种不同偏振模式支持两种速度的光传播的高双折射光纤(38,58)。 在耦合到每个光纤的快速本征模式中的光之间产生第一干涉图,而在耦合到慢本征模中的光之间产生第二干涉图。 这些干涉图的平均光学组延迟(tau MGD)和差分光学组延迟(tau DGD)受到温度和应变的不同的影响,因此提供了区分传感器环境的这些属性的手段。 因此实现了应变和温度的同时测量。
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公开(公告)号:US5803607A
公开(公告)日:1998-09-08
申请号:US682731
申请日:1997-01-06
CPC分类号: G01K13/02 , G01K11/3206
摘要: Apparatus for the measurement of unsteady gas temperatures comprises (a) a temperature probe having a sensing element. The sensing element has an optical interferometer optically coupled to one end of a first, addressing optical fibre. The interferometer has a first partially reflective surface defined at the end of the addressing fibre and a second partially reflective surface spaced from the first partially reflective surface by an optical path length I. The apparatus further comprises (b) a light source optically coupled to a second end of the addressing fibre, (c) an interrogating optical path optically coupled to the addressing fibre by a beam splitter whereby a portion of an optical phase signal from the sensing element is directed to a first end of the interrogating path and a portion of the input light from the light source is directed to a second end of the interrogating path, (d) first photodetector coupled to the first end of the interrogating path; and (e) data acquisition and processing means connected to the photodetector means, the data acquisition and processing means being adapted to derive the temperature of the sensing element from the phase signal.
摘要翻译: PCT No.PCT / GB95 / 00132 Sec。 371日期1997年1月6日 102(e)日期1997年1月6日PCT 1995年1月24日PCT PCT。 WO95 / 20752 PCT公开号 日期1995年8月3日用于测量不稳定气体温度的装置包括(a)具有传感元件的温度探头。 感测元件具有光学耦合到第一寻址光纤的一端的光学干涉仪。 所述干涉仪具有限定在所述寻址光纤端部的第一部分反射表面和与所述第一部分反射表面间隔开光路长度I的第二部分反射表面。所述设备还包括(b)光学耦合到 寻址光纤的第二端,(c)由分束器光耦合到寻址光纤的询问光路,其中来自感测元件的光相位信号的一部分被引导到询问路径的第一端,并且一部分 来自光源的输入光被引导到询问路径的第二端,(d)耦合到询问路径的第一端的第一光电检测器; 和(e)连接到光电检测器装置的数据采集和处理装置,数据采集和处理装置适于从相位信号导出感测元件的温度。
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公开(公告)号:US5850068A
公开(公告)日:1998-12-15
申请号:US867813
申请日:1997-06-03
CPC分类号: B23K26/046
摘要: When a laser beam interacts with a workpiece to be welded by the beam, a plume of optical radiation is generated. An apparatus and method is disclosed in which radiation from the plume is received back through a beam delivery path comprising optical elements (L1,L2) having chromatic aberration. This alters the focus of different spectral bands of the plume radiation and a discriminating aperture is formed by a face of an optical fibre (3). After passing through the fibre, the plume radiation is separated from any laser radiation and the respective powers of the different spectral bands are measured (5). By subtraction, an error signal is obtained which is used to control the focus of the laser beam.
摘要翻译: 当激光束与待焊接的工件相互作用时,产生一束光辐射。 公开了一种装置和方法,其中来自羽流的辐射通过包括具有色差的光学元件(L1,L2)的光束传递路径被接收回来。 这改变了羽流辐射的不同谱带的焦点,并且由光纤(3)的面形成鉴别孔。 通过光纤后,羽流辐射与任何激光辐射分离,并测量不同光谱带的相应功率(5)。 通过减法,获得用于控制激光束焦点的误差信号。
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