-
公开(公告)号：US20050103988A1
公开(公告)日：2005-05-19
申请号：US10960075
申请日：2004-10-08
Applicant: Chuji Wang
Inventor： Chuji Wang
CPC classification number: G01L1/243
Abstract: A novel fiber ringdown (FRP) pressure sensor is provided for measuring extremely high pressures under extreme environmental conditions of cold and heat. Pressure measurements are achieved in a time domain by measuring ringdown times of emitted light through the fiber optic loop of the device. The novel FRP sensor can include a light source, such as a diode laser light source, two 2×1 fiber couplers, a section of fused silica single mode fiber, a photodetector, and an electronic control. The novel FRP sensor's performance in the areas of stability, reproducibility, dynamic range, and temperature tolerance are far above those of conventional sensors.
Abstract translation: 提供了一种新型的光纤阻尼（FRP）压力传感器，用于在极端的寒冷和高温环境条件下测量极高的压力。 通过测量通过装置的光纤环路的发射光的衰减时间，在时域中实现压力测量。 新型FRP传感器可以包括诸如二极管激光光源的光源，两个2x1光纤耦合器，熔融石英单模光纤的一部分，光电检测器和电子控制器。 新型FRP传感器在稳定性，重现性，动态范围和耐温性方面的性能远远高于常规传感器。
-
公开(公告)号：US5241300A
公开(公告)日：1993-08-31
申请号：US874297
申请日：1992-04-24
Applicant: Johannes Buschmann
Inventor： Johannes Buschmann
CPC classification number: G01L1/245 , A61B5/1135 , G01L1/243 , A61B2503/06 , A61B2560/0475
Abstract: A transilluminated optical fiber is placed adjacent to an infant's respiratory moving parts using an elastic fabric. Use is made of the effect that moving the fiber causes a modulation of the intensity of the transmitted light to monitor the infant's breathing pattern to avoid S(udden) I(nfant) D(eath) S(yndrome).
Abstract translation: 使用弹性织物将透光光纤放置在婴儿呼吸运动部分附近。 使用这样的效果，移动纤维导致透射光的强度的调制以监测婴儿的呼吸模式，以避免S（udden）I（nfant）D（eath）S（yndrome）。
-
公开(公告)号：US5072113A
公开(公告)日：1991-12-10
申请号：US579866
申请日：1990-09-07
Applicant: Mario Martinelli , Valeria Gusmeroli , Paolo Vavassori
Inventor： Mario Martinelli , Valeria Gusmeroli , Paolo Vavassori
CPC classification number: G01L1/243 , G01D5/35383
Abstract: In a polarimetric fibre-optic sensor using a polarization-maintaining optical fibre with two light propagation modes, a reference light signal is fed to propagate along the optical fibre in accordance with one propagation mode, a series of measurement light signals being induced by a series of optical fibre deformation elements, to propagate along the optical fibre in accordance with the other propagation mode, each being unbalanced in time with respect to the reference light signal by an amount which is different from that of the other measurement light signals; by using particular interferometric techniques, compensating the unbalances and analyzing the signals resulting from the interference between the measurement light signals and the reference light signal it is possible to determine and locate a physical phenomenon which disturbs the optical fibre.
-
公开(公告)号：US4947693A
公开(公告)日：1990-08-14
申请号：US379374
申请日：1989-07-13
Applicant: Nicholas C. Szuchy , Anthony Caserta
Inventor： Nicholas C. Szuchy , Anthony Caserta
IPC: G01L1/24
Abstract: A fiber optic load sensor and method of forming the same are disclosed for sensing the load applied to a structural surface. The sensor comprises a length of fiber optic material disposed adjacent to the surface. The fiber optic material is connectable to a light source and to a light detector. The fiber optic material includes at least one curved portion deformable in response to the applied load. The curved portion is dimensioned such that the light passing through the fiber optic material is attenuated in linear relation to the deformation of the curved portion in response to the load applied to the surface.
Abstract translation: 公开了一种光纤负载传感器及其形成方法，用于感测施加到结构表面的负载。 该传感器包括与表面相邻布置的一定长度的光纤材料。 光纤材料可连接到光源和光检测器。 光纤材料包括响应于所施加的负载而变形的至少一个弯曲部分。 弯曲部分的尺寸使得穿过光纤材料的光响应于施加到表面的负载而与弯曲部分的变形呈线性关系衰减。
-
公开(公告)号：US4937029A
公开(公告)日：1990-06-26
申请号：US333505
申请日：1989-04-05
Applicant: Minoru Ishiharada , Toshio Chikaraishi , Hiroshi Kaneda , Seisuke Tomita
Inventor： Minoru Ishiharada , Toshio Chikaraishi , Hiroshi Kaneda , Seisuke Tomita
CPC classification number: B29C35/10 , B29C35/06 , B29C47/128 , B29D11/00663 , G01L1/243 , B29C2035/0827 , B29C2035/0877 , B29C35/041 , B29C35/045 , B29C35/049 , B29C47/0016 , B29K2019/00 , B29K2995/0031 , B29L2011/0075
Abstract: A pressure-sensitive sensor comprises an optical wave guide consisting of a core and a clad, and a light emitting means and a light receiving means each connected to the optical wave guide. The core is made from a transparent material having a refractive index somewhat larger than that of a material constituting the clad and selected from chloroprene rubber, urethane rubber, silicone rubber, fluorine rubber, acrylic rubber, ethylene-propylene rubber, ethylene-propylene-diene terpolymer rubber and epichlorohydrin rubber.
-
Patent Agency Ranking26.发明授权Single mode optical fiber polarimetric stress sensor having optical common mode rejection 失效具有光学共模抑制的单模光纤偏振应力传感器
公开(公告)号：US4564289A
公开(公告)日：1986-01-14
申请号：US636397
申请日：1984-07-31
Applicant: William B. Spillman, Jr.
Inventor： William B. Spillman, Jr.
CPC classification number: G01D5/344 , G01L1/243 , G01R15/248
Abstract: An instrument for measuring stress is arranged to be insensitive to stresses caused by conditions other than that of the phenomenon to be measured. The instrument employs two equal lengths of optical fibers of the kind exhibiting birefringence when stressed. Polarized light is directed into one of the optical fibers along its longitudinal axis. The two optical fibers are arranged in series with respect to the longitudinal transmission of the polarized light through those fibers. A polarization rotator is situated in the light path between the two optical fibers. The polarized light transmitted through the polarization rotator is rotated by an amount causing stresses imposed equally on the two optical fibers to have equal and opposite effects of the transmitted polarized light. The invention may be embodied to permit the measurement of acceleration, pressure, fluid flow rate, magnetic field gradient, magnetic field strength, electric field strength, electric field gradient, or any other phenomena that can be made to produce stress on an optical fiber. The invention is especially useful in differential measurement because the device measures the difference in stress imposed on the two optical fibers.
Abstract translation: 用于测量应力的仪器被布置为对由不同于待测现象的条件引起的应力不敏感。 该仪器在应力时采用两种相等长度的具有双折射的光纤。 偏振光沿其纵向轴线被导入一根光纤。 两根光纤相对于通过这些光纤的偏振光的纵向透射而串联布置。 偏振旋转器位于两根光纤之间的光路中。 通过偏振旋转体传播的偏振光旋转一定量，使得两个光纤上施加相等应力的应力具有透射偏振光的相等和相反的作用。 本发明可以被实施为允许测量可以在光纤上产生应力的加速度，压力，流体流速，磁场梯度，磁场强度，电场强度，电场梯度或任何其它现象。 本发明在差分测量中特别有用，因为该装置测量施加在两根光纤上的应力差。
-
公开(公告)号：US4360247A
公开(公告)日：1982-11-23
申请号：US225892
申请日：1981-01-19
Applicant: J. Donald Beasley
Inventor： J. Donald Beasley
CPC classification number: G02F1/0134 , G01H9/004 , G01L1/243 , G01L11/025 , G01L9/0076 , G02B6/2826 , G02B6/283 , G02B6/3536 , G02B6/3546 , G02B6/3574 , Y10S73/11
Abstract: An apparatus is disclosed for optically sensing pressure using evanescent wave coupling between two fiber optics. A support base with a channel holds the two waveguides, one on top of the other, with the portion of the waveguide having the cladding material removed in the channel. An upper member having a diaphragm is attached to the support base. The diaphragm has a pedestal attached that is in slight contact with one of the waveguides. When pressure is exerted upon the diaphragm, the waveguides are forced closer together thus affecting the amount of evanescent coupling therebetween.
Abstract translation: 公开了一种用于使用两个光纤之间的ev逝波耦合光学感测压力的装置。 具有通道的支撑基座保持两个波导，一个在另一个之上，波导的部分在通道中被去除。 具有隔膜的上部构件附接到支撑基座。 隔膜具有与其中一个波导轻微接触的底座。 当压力施加在隔膜上时，波导被迫靠近在一起，从而影响它们之间的ev逝耦合量。
-
公开(公告)号：US4071753A
公开(公告)日：1978-01-31
申请号：US563869
申请日：1975-03-31
Applicant: John E. Fulenwider , John Gonsalves
Inventor： John E. Fulenwider , John Gonsalves
CPC classification number: G02B6/3574 , G01H9/006 , G01L1/243 , G01L11/025 , G01L9/0076 , G01L9/0077 , G02B26/08 , G02B6/3502 , G02B6/3514 , G02B6/352 , G02B6/3552 , G02B6/3594
Abstract: A transducer is disclosed in which energy received from either mechanical or acoustic sources is converted into modulated optical power. The transducer is comprised of three basic components, an input optical fiber, an output optical fiber and a means for varying the optical coupling coefficient between the two fibers in response to information containing energy received from a mechanical or acoustic source. The input optical fiber carries a steady state optical signal which may be either continuous or pulsed. The means operates to control the coupling of the steady state optical signal into the output optical fiber. An intensity modulated output signal is then carried by the output optical fiber away from the transducer. The intensity modulated output signal may be either detected and thereby converted to electrical energy for transmission or may be transmitted in an optical form if optical communications facilities are available.
Abstract translation: 公开了一种传感器，其中从机械或声源接收的能量被转换成调制光功率。 传感器包括三个基本部件，输入光纤，输出光纤和用于响应于包含从机械或声源获得的能量的信息而改变两个光纤之间的光耦合系数的装置。 输入光纤承载可以是连续的或脉冲的稳态光信号。 该装置用于控制稳态光信号耦合到输出光纤中。 然后，强度调制输出信号由输出光纤远离换能器传送。 强度调制输出信号可以被检测，从而被转换成用于传输的电能，或者如果光通信设施可用，则可以以光学形式传输强度调制输出信号。
-
公开(公告)号：US12044281B2
公开(公告)日：2024-07-23
申请号：US17618095
申请日：2020-06-10
Applicant: BREMBO S.p.A.
Inventor： Francesco Camozzi , Luca Maestrini , Alessandro Casini , Tiziano Nannipieri , Salvatore Bonomo
CPC classification number: F16D66/028 , G01B11/18 , G01L1/243 , G01L5/0042 , G01L5/166 , F16D2066/001 , F16D2066/005 , F16D2066/006
Abstract: A method for detecting and measuring a clamping force and/or a braking torque includes encapsulating a fiber-optic strain sensor in a casing and incorporating the casing in a portion of friction material adhering to a base platform of a brake pad, detecting, by the fiber-optic strain sensor, a first strain in a first position of the casing along a first direction and a second strain in a second position of the friction material along a second direction, generating a first photonic signal, representative of the first detected strain, and a second photonic signal, representative of the second detected strain, receiving the first and second photonic signals, by an optical reading/interrogation unit, optically connected to the fiber-optic strain sensor, determining, by the optical reading/interrogation unit, the values of the first and second strains based on the first and second received photonic signals and determining a measurement of the clamping force and/or braking torque based on determined values of the first and second strains.
-
公开(公告)号：US20230221194A1
公开(公告)日：2023-07-13
申请号：US18000916
申请日：2021-06-14
Applicant: TECHNISCHE UNIVERSITEIT EINDHOVEN
IPC: G01L1/24
Abstract: The present invention discloses a two-dimensional optical waveguide pressure sensor array comprising two or more row optical waveguides; two or more column optical waveguides, wherein the row optical waveguides and the column optical waveguides are deformable and arranged in a planar array to define a sensor in the crosspoints, wherein each crosspoint includes one of the row waveguides in contact with one of the column waveguides at its intersection point; wherein each crosspoint further includes a light coupling structure configured to enhance waveguide bending when pressure is applied to the crosspoint; wherein the light coupling structure comprises a layer of mechanical light scattering material disposed in contact with at least one of the row or column optical waveguide; or wherein the optical waveguide pressure sensor array can sense pressure by providing light to the row optical waveguides and measuring light coupled at each crosspoint to its column optical waveguide.
-
-
-
-
-
-
-
-
-
Search Results
164
records
(took 0.015 seconds)
