公开(公告)号：US07054011B2

公开(公告)日：2006-05-30

申请号：US10911635

申请日：2004-08-05

申请人： Yizheng Zhu ,  Xingwei Wang ,  Juncheng Xu ,  Anbo Wang

发明人： Yizheng Zhu ,  Xingwei Wang ,  Juncheng Xu ,  Anbo Wang

IPC分类号： G01B9/02

CPC分类号： G01L9/0079 ,  G01B9/02023 ,  G01B2290/25 ,  G01H9/004 ,  G01P15/093

摘要： A fiber optic sensor has a hollow tube bonded to the endface of an optical fiber, and a diaphragm bonded to the hollow tube. The fiber endface and diaphragm comprise an etalon cavity. The length of the etalon cavity changes when applied pressure or acceleration flexes the diaphragm. The entire structure can be made of fused silica. The fiber, tube, and diaphragm can be bonded with a fusion splice. The present sensor is particularly well suited for measuring pressure or acceleration in high temperature, high pressure and corrosive environments (e.g., oil well downholes and jet engines). The present sensors are also suitable for use in biological and medical applications.

摘要翻译： 光纤传感器具有结合到光纤端面的中空管，以及结合到中空管的隔膜。 纤维端面和隔膜包括标准具腔。 当施加压力或加速度弯曲隔膜时，标准具腔的长度会发生变化。 整个结构可以由熔融石英制成。 纤维，管和隔膜可以用熔接粘合。 本传感器特别适用于在高温，高压和腐蚀性环境（例如油井下井和喷气发动机）中测量压力或加速度。 本传感器也适用于生物和医学应用。

公开(公告)号：US5446280A

公开(公告)日：1995-08-29

申请号：US114511

申请日：1993-08-31

申请人： Anbo Wang ,  Kent A. Murphy ,  Richard O. Claus

发明人： Anbo Wang ,  Kent A. Murphy ,  Richard O. Claus

IPC分类号： G01D5/26 ,  G01K11/32 ,  H01J5/16 ,  H01J40/14

CPC分类号： G01D5/268 ,  G01K11/32

摘要： A fiber optic sensor is fully compensated for light source intensity variation, fiber losses and modal power distribution by providing input to one end of an optical fiber from a relatively broad band light source containing at least two spectrally separated wavelengths. At least one of these spectrally separated wavelengths is reflected back into the optical fiber by a filter located between a second end of the optical fiber and a reflective transducer. The filter is preferably of the interference edge filter type and has a nominal cut-off wavelength within the spectral band of the light source or between the two spectrally separated wavelengths. Therefore, the paths traversed by light of the spectrally separated wavelengths will differ only by twice traversing the reflective transducer. Temperature measurement or compensation can also be provided by sensing of reflected light intensity or power at approximately the nominal cut-off frequency of the filter. Reflective transducers of both the intensity-based and interferometric types are usable with the invention.

摘要翻译： 光纤传感器通过从包含至少两个频谱分离的波长的相对宽带光源提供输入到光纤的一端而完全补偿光源强度变化，光纤损耗和模态功率分布。 这些光谱分离的波长中的至少一个通过位于光纤的第二端和反射换能器之间的滤光器反射回光纤。 滤波器优选地具有干涉边缘滤波器类型，并且在光源的光谱带内或在两个光谱分离的波长之间具有标称截止波长。 因此，通过光谱分离的波长的光穿过的路径将仅通过两次穿过反射换能器而不同。 温度测量或补偿也可以通过在大约过滤器的标称截止频率处感测反射光强度或功率来提供。 基于强度和干涉式的反射换能器可用于本发明。

公开(公告)号：US08743365B2

公开(公告)日：2014-06-03

申请号：US13473227

申请日：2012-05-16

申请人： Bo Dong ,  Anbo Wang ,  Jianmin Gong

发明人： Bo Dong ,  Anbo Wang ,  Jianmin Gong

IPC分类号： G01N21/00

CPC分类号： G01N21/59 ,  G01N21/33 ,  G01N33/2841

摘要： An inspection probe for directly measuring a transmission spectrum of a solvent oil in a transformer includes a tube having a plurality of apertures spaced along a side of the tube to allow oil to pass therethrough, and first and second optical collimators disposed at opposing ends of the tube. The first and second collimators are aligned by the tube such that incident light is transmitted through the first collimator, the tube, and the second collimator to a spectrometer.

摘要翻译： 用于直接测量变压器中的溶剂油的透射光谱的检查探针包括具有沿着管的一侧间隔开的许多孔的管，以允许油通过其中;以及第一和第二光学准直器，其布置在 管。 第一和第二准直器通过管对准，使得入射光通过第一准直仪，管和第二准直器传输到光谱仪。

公开(公告)号：US07495772B2

公开(公告)日：2009-02-24

申请号：US11413119

申请日：2006-04-28

申请人： Yan Zhang ,  Kristie L. Cooper ,  Anbo Wang

发明人： Yan Zhang ,  Kristie L. Cooper ,  Anbo Wang

IPC分类号： G01B11/02 ,  G01B9/02 ,  G01B11/28

CPC分类号： G01B11/0675 ,  G01B2290/25 ,  G01N21/39 ,  G01N21/45 ,  G01N21/7746 ,  G01N2021/7773 ,  G01N2021/7779

摘要： A fiber optic sensor includes at least two Fabry-Perot (FP cavities) defined by at least three partially reflecting surfaces which individually and together are capable of generating different interference spectra which are affected by temperature. One of the FP cavities is formed at an end of the sensor and includes a surface which is capable of supporting a thin film, the optical thickness of which is to be measured. The other FP cavity between the lead-in fiber and the first FP cavity thus does not include the film and can thus independently provide highly accurate temperature information for calibrating the optical length of the second FP cavity and compensation for temperature effects on measurement of the thin film supported thereon, preferably by subtraction of a calibrated temperature-dependent change in optical length of the second FP cavity from the measurement made.

摘要翻译： 光纤传感器包括由至少三个部分反射表面限定的至少两个法布里 - 珀罗（FP空腔），该至少三个部分反射表面单独地和一起能够产生受温度影响的不同干涉光谱。 FP腔中的一个形成在传感器的端部，并且包括能够支撑其光学厚度被测量的薄膜的表面。 因此，引入光纤和第一FP腔之间的另一个FP腔不包括膜，因此可以独立地提供高精度的温度信息，用于校准第二FP腔的光学长度，并补偿温度对薄膜测量的影响 优选通过从所进行的测量中减去第二FP空腔的光学长度的校准温度依赖性变化来支撑其上的薄膜。

公开(公告)号：US07045767B2

公开(公告)日：2006-05-16

申请号：US10653920

申请日：2003-09-04

申请人： Wei Peng ,  Bing Qi ,  Anbo Wang

发明人： Wei Peng ,  Bing Qi ,  Anbo Wang

IPC分类号： G02B6/42

CPC分类号： G01F1/661 ,  G01F1/28

摘要： A flow rate fiber optic transducer is made self-compensating for both temperature and pressure by using preferably well-matched integral Fabry-Perot sensors symmetrically located around a cantilever-like structure. Common mode rejection signal processing of the outputs allows substantially all effects of both temperature and pressure to be compensated. Additionally, the integral sensors can individually be made insensitive to temperature.

摘要翻译： 通过使用对称地位于悬臂状结构周围的优选匹配良好的整体法布里 - 珀罗传感器，流速光纤传感器对温度和压力进行自补偿。 输出的共模抑制信号处理基本上能够补偿温度和压力两者的所有影响。 另外，积分传感器可以分别对温度不敏感。

公开(公告)号：US20050195403A1

公开(公告)日：2005-09-08

申请号：US10791842

申请日：2004-03-04

申请人： Juncheng Xu ,  Anbo Wang

发明人： Juncheng Xu ,  Anbo Wang

IPC分类号： G01B9/02

CPC分类号： G01D5/266 ,  G01D5/268 ,  G01K11/3206 ,  G01L9/0079

摘要： A diaphragm optic sensor comprises a ferrule including a bore having an optical fiber disposed therein and a diaphragm attached to the ferrule, the diaphragm being spaced apart from the ferrule to form a Fabry-Perot cavity. The cavity is formed by creating a pit in the ferrule or in the diaphragm. The components of the sensor are preferably welded together, preferably by laser welding. In some embodiments, the entire ferrule is bonded to the fiber along the entire length of the fiber within the ferrule; in other embodiments, only a portion of the ferrule is welded to the fiber. A partial vacuum is preferably formed in the pit. A small piece of optical fiber with a coefficient of thermal expansion chosen to compensate for mismatches between the main fiber and ferrule may be spliced to the end of the fiber.

摘要翻译： 隔膜光学传感器包括套圈，其包括其中设置有光纤的孔和附接到套圈的膜片，隔膜与套圈间隔开以形成法布里 - 珀罗腔。 通过在套圈或隔膜中产生凹坑来形成空腔。 传感器的部件优选地通过激光焊接焊接在一起。 在一些实施例中，整个套圈沿着套​​管内纤维的整个长度结合到纤维上; 在其它实施例中，仅将套圈的一部分焊接到纤维上。 在凹坑中优选形成部分真空。 选择具有热膨胀系数以补偿主光纤和套圈之间的错配的小片光纤可以被接合到光纤的端部。

公开(公告)号：US6069686A

公开(公告)日：2000-05-30

申请号：US309660

申请日：1999-05-11

申请人： Anbo Wang ,  Wei Zhao ,  Jun Wang ,  Hai Xiao

发明人： Anbo Wang ,  Wei Zhao ,  Jun Wang ,  Hai Xiao

IPC分类号： G01D5/26 ,  G01K11/32 ,  G01L1/24 ,  G01B9/02

CPC分类号： G01L1/242 ,  G01D5/266 ,  G01D5/268 ,  G01K11/32

摘要： Broadband energy incident on a transducer having partially or fully reflective surfaces separated by a gap which is greater than the coherence length of the broadband energy but smaller than one-half a coherence length of a band of energy within said broadband energy causes a portion of the spectral content of the broadband energy corresponding to a coherence length greater than twice the gap length to exhibit interference effects while the average power of the broadband energy remains unaffected. Splitting energy reflected from the transducer into two beams which are filtered at preferably similar center frequencies but with different pass bands yields beams which are radically different in sensitivity to changes in gap length. Analyzing the beams to derive a ratio of powers (since source intensity and fiber attenuation in a common fiber are thus self-cancelling) allows high accuracy and high resolution absolute measurement of temperature, pressure or strain. Effects of any of these physical parameters which are not of interest in a measurement can be fully compensated or made arbitrarily insignificant in a simple transducer structure of extremely small size. Use of broadband energy permits measurement over greater lengths of optical fiber.

摘要翻译： 入射在具有部分或全部反射面的换能器上的宽带能量，所述反射表面被间隙分开，所述间隙大于宽带能量的相干长度但小于所述宽带能量内的能带的相干长度的一半会导致部分 宽带能量的频谱内容对应于大于间隙长度的两倍的相干长度，以显示干扰效应，而宽带能量的平均功率保持不受影响。 将从换能器反射的能量分裂为在优选地类似的中心频率但具有不同通过频带的滤波器的两个波束产生与间隙长度变化的灵敏度完全不同的波束。 分析光束以获得功率比（因为普通光纤中的源强度和光纤衰减因此是自消除的）允许高精度和高分辨率的绝对测量温度，压力或应变。 在测量中不感兴趣的这些物理参数中的任何一个的影响可以在极小尺寸的简单的换能器结构中被完全补偿或任意地不显着。 宽带能量的使用允许在更长的光纤上进行测量。

公开(公告)号：US5381229A

公开(公告)日：1995-01-10

申请号：US937651

申请日：1992-08-31

申请人： Kent Murphy ,  Ashish Vengsarkar ,  Shari Feth ,  Richard Claus ,  Sridhar Gollapudi ,  Anbo Wang

发明人： Kent Murphy ,  Ashish Vengsarkar ,  Shari Feth ,  Richard Claus ,  Sridhar Gollapudi ,  Anbo Wang

IPC分类号： G01D5/26 ,  G01K11/32 ,  G01R9/02

CPC分类号： G01D5/268 ,  G01K11/3206

摘要： An optical interferometer comprises a multi-mode sapphire fiber as a high temperature sensor. One end of the sapphire fiber is coupled to a silica fiber and, in turn, to the sapphire fiber. The sapphire fiber sensor produces reference and sensor reflections that produce optical fringes at the output of a detector coupled to the silica optical fiber via an opto-coupler. The optical fringes are related to displacements of the sensor which, in turn, can provide an indirect measurement of pressure, strain or temperature of the surface.

摘要翻译： 光干涉仪包括作为高温传感器的多模式蓝宝石光纤。 蓝宝石纤维的一端与二氧化硅纤维相连，而与蓝宝石纤维相连。 蓝宝石光纤传感器产生参考和传感器反射，其通过光耦合器在耦合到二氧化硅光纤的检测器的输出处产生光边。 光学条纹与传感器的位移相关，传感器的位移又可以提供对表面的压力，应变或温度的间接测量。