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Measuring And Testing > Specimen Stress Or Strain, Or Testing By Stress Or Strain Application > By Loading Of Specimen (e.g., Strength Of Material Test) > Optical

Optical

Optical patent applications listed include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.

06/05/14 - 20140150563 - Strain sensing cable
A strain sensing cable including one or more strain sensing elements and a strain transfer medium extruded directly onto the one or more strain sensing elements disposed within the strain transfer medium. The strain transfer medium is operatively arranged to transfer strain experienced by the cable to the one or...

03/27/14 - 20140083197 - Distributed sensing employing stimulated brillouin scattering in optical fibers
Disclosed are methods and devices for distributed sensing of a measurable parameter employing stimulated Brillouin scattering in an optical fiber. A frequency-modulated or phase-modulated light wave is transmitted into the optical fiber. A scattered light wave in the optical fiber is monitored for sensing a measurable parameter. In some embodiments,...

02/27/14 - 20140053654 - Shape sensing using a multi-core optical fiber having an arbitrary initial shape in the presence of extrinsic forces
Shape of a multi-core optical fiber is determined by positioning the fiber in an arbitrary initial shape and measuring strain over the fiber's length using strain sensors. A three-coordinate p-vector is defined for each core as a function of the distance of the corresponding cores from a center point of...

02/20/14 - 20140047926 - Frame foot loading measurement system using fiber optic sensing technique
A fiber Bragg grating (FBG) based sensor is used as a strain sensing element to determine frame foot loading of a generator. Three FBGs may be used in tandem to form a basic Frame Foot Loading Module (FFL Module). Two modules are fixed on each vertical support gusset at the...

02/06/14 - 20140033825 - Method and assembly for sensing permanent deformation of a structure
The present invention relates to a method of sensing permanent deformation of a structure, the method comprising the steps of; determining the strain required to permanently deform a structure; securing to the structure one or more strain sensors so that a strain sensor will deform when the structure is deformed,...

01/30/14 - 20140026673 - Methods, systems, and computer readable media for testing cutting blade integrity
A system for evaluating integrity of a cutting blade includes at least one stress wave generator for generating at least one stress wave in a cutting blade under test. A sensor detects a signal generated by the at least one stress wave. An integrity analyzer coupled to the sensor determines...

01/30/14 - 20140026674 - Method for fatigue assessment of rolling bearing
The present invention related to a method, and an apparatus arrangement, for determining a fatigue limit for rolling contact initiated fatigue of a rolling bearing. The method comprises running a rolling bearing while being exerted to a load which generates sub-surface transformations in a rolling element contact zone of the...

01/02/14 - 20140000380 - Method and apparatus for determining geometry deformation in rotating components
A method is provided for measuring geometry deformations of a turbine component, rotor groove or blade root. The method includes providing the turbine component, rotor groove or blade root, respectively, with at least one measuring mark; using the at least one mark as a reference point in determining, in a...

10/03/13 - 20130255397 - Optical fiber tensile screening method and device
A method and device for continuously testing the tensile strength of an optical fiber, wherein the incoming optical fiber is wrapped at least partially around a payout capstan, to an intermediate payout pulley, at least partially around the intermediate payout pulley, and back to the payout capstan. The optical fiber...

10/03/13 - 20130255398 - Wind turbine blade with optical sensor system
Wind turbine blade comprising a sensor system with an optical path comprising a first optical sensor fiber, a second optical sensor fiber and a patch optical fiber, the first optical sensor fiber including a first core with a first core diameter wherein the first optical sensor fiber extends from a...

09/26/13 - 20130247681 - Torsion measurement device
A torsion measurement device is disclosed. In one embodiment, the device includes a component having a marked surface and an optical sensor. The marked component and the optical sensor may be attached to a tube or other elongate member and positioned to enable the optical sensor to measure angular deflection...

07/11/13 - 20130174666 - Apparatus. system and method for dynamically measuring material viscoelasticity using shear wave induced resonance
A system for dynamically measuring viscoelasticity of material samples using shear wave induced resonance, the system comprising: i) an apparatus comprising a vibration source; a vibration detector; a processor, and a user interface, for example to select a sample holder configuration, and ii) a rigid sample holder connectable to the...

06/06/13 - 20130139606 - Method and apparatus for fixing strained optical fibers against creep and temperature and strain sensors using said technology
Optical fiber anchors accomplishing low creep confinement or fixing of a section of optical fiber in an assembly compact enough to be used conveniently as an anchor or as an enabling part of a strain or temperature sensor while retaining low optical losses and the original buffer coating to prevent...

04/25/13 - 20130098164 - Triboluminescent optical fiber sensor
A sensor that can be used for in-situ structural health monitoring with a triboluminescent material provided on a portion of an optical fiber that may be embedded in materials to be structurally monitored. Damage to the monitored material may result in a triboluminescent emission from the triboluminescent material that can...

04/18/13 - 20130091956 - Sensing assembly
A sensing assembly including a fiber for monitoring at least one condition or parameter and a strip formed from a pair of laminae disposed with the fiber. The laminae are arranged parallel to each other and engaged longitudinally along the fiber for enabling the strip to secure the fiber in...

04/18/13 - 20130091957 - System and method for structure stiffness determination
In at least one implementation, a method for determining the stiffness of a structure may include connecting a test member to the structure, directing a beam of light at a measurement surface carried by at least one of the test member or the structure, impacting an impact surface carried by...

03/21/13 - 20130068034 - Micromaterial strain measurement apparatus and method therefor techinical field
A measurement unit for tensile or compressive stress can includes a CCD camera for detecting an interference light, the interference light being formed with a measurement beam from a measured region and a reference beam from a reference mirror. A first objective lens can have the reference mirror. An image...

02/21/13 - 20130042696 - Material testing machine
Provided is a material testing system provided with: an upper gripper 21 and a lower gripper 22 that grip a test piece 10; a video camera 18 that photographs the upper gripper 21 and the lower gripper 22 and the test piece 10; a first display part 25; a second...

02/14/13 - 20130036829 - Optical shear sensor and method of producing such an optical shear sensor
An optical shear sensor that includes a first and second outer surface at opposing sides and a sensing element is disclosed. In one aspect, the sensing element has an optoelectronic source for emitting light of a predetermined wavelength and having a source front surface where light exits the optoelectronic source,...

02/14/13 - 20130036830 - Tensometric transducer
The tensometric transducer comprises a load element which is fixed to an object to be monitored, and a piezo-optical transducer which converts the magnitude of the stresses on a photoelastic element into an electrical signal, wherein the load element is in the form of a plate having a thinned portion...

11/01/12 - 20120272744 - Fiber optic sensor based on spiral structure
A fiber optic sensor based on spiral structure is a multi-loop spiral member formed by spring wire. A plurality of deformation teeth are continuously distributed on the upper surface and the lower surface of the spring wire in a longitudinal direction along the spring wire; in two adjacent loops of...

09/20/12 - 20120234101 - Pressure and measurement by means of an optical fiber
An optical fiber (FD) that can be used for measuring pressure is arranged as follows. The optical fiber (FD) comprises a core (CO) and a cladding (CL) surrounding and contacting the core (CO). A stress-applying arrangement (SE1, SE2), which is embedded in the cladding (CL), applies constant anisotropic stress on...

07/26/12 - 20120186357 - Method and device for measuring by penetrometry an interface or surface tension of an interface between two fluids
A method is provided for measuring an interfacial tension (σ) for liquid-liquid interfaces or surface tension for liquid-gas interfaces. The method is characterised in that the measurement is carried out by the penetrometry of an interface between two fluids of a sample in a pipe comprising at least one window...

07/12/12 - 20120174683 - Electric cable with bending sensor and monitoring system and method for detecting bending in at least one electric cable
A method for monitoring at least the bending strain of at least one electric cable provided with at least one peripheral mechanically non-symmetric strength member is provided....

06/28/12 - 20120160031 - Optical tactile sensors
A sensor for sensing pressure is disclosed. The sensor may be a pressure sensor for sensing pressure, or a tactile sensor for sensing tactile events through pressure measurement. In one aspect, the sensor includes at least one pressure sensor having at least one VCSEL on a substrate. It further includes...

05/31/12 - 20120132008 - Fiber optic load measurement device
A measurement device may include a loadable member that supports a load and measures the force created in the loadable member by the load. The loadable member may have an aperture and an optical fiber located within the aperture. The optical fiber may include one or more fiber Bragg grating...

05/31/12 - 20120132009 - Fiber optic shape sensor
A shape sensing system to determine the position and orientation of one link with respect to another link in a kinematic chain. An optical fiber is coupled to two or more links in a kinematic chain. A shape sensing segment is defined to start at a proximal link and to...

03/22/12 - 20120067134 - Display bender and method of testing flexible display
Some embodiments include an apparatus for testing flexible displays. The apparatus can include: (a) a first clamp configured to receive a first end of the flexible display; (b) a second clamp configured to receive a second end of the flexible display, wherein the second end of the flexible display is...

11/03/11 - 20110265578 - Local stress measurement
An optical metrology device determines the local stress in a film on a substrate. The metrology device maps the thickness of the substrate prior to processing. After processing, the metrology device determines the surface curvature of the substrate caused by the processing and maps the thickness of a film on...

10/27/11 - 20110259115 - Structural load monitoring using collars and connecting elements with strain sensors
A system and method for measuring loads on a pipe, including a pair of collars that can be secured around the outer surface of the pipe to be monitored in an axially spaced relationship; and a connecting element having a strain gauge is fixed to the collars such that when...

10/13/11 - 20110247427 - Strain sensing with optical fiber rosettes
One or more mechanical parameters of a structure subjected to a force or condition are measured using distributed, optical fiber sensing technology. At least a curved portion an optical fiber having is attached to an object. A distributed, optically-based, strain sensing technique is used to determine strain information associated with...

09/08/11 - 20110214508 - Monitoring the structural integrity of a wind turbine blade
A method of monitoring the structural integrity of a wind turbine blade 1 is disclosed. The blade 1 has at least two shell portions 2a, 2b, forming the outer surface of the turbine blade 1. At least one web member 3a, 3b connects the shell portions 2a, 2b in a...

06/30/11 - 20110154907 - Structural deflection and load measuring device
The present invention provides a structural deflection and load measuring device for mounting on an axle. The device includes at least one light beam emitting device connected to the axle and able to emit at least one light beam and at least one light position sensing device connected to the...

12/30/10 - 20100326200 - Shear stress measurement apparatus
A shear stress sensor for measuring the shear force of a fluid flowing along a wall. A floating member, flush with the wall, senses a shear force of the flowing fluid. The floating member is mounted by support means to a base element that is placed in the wall, so...

12/16/10 - 20100313668 - Fiber strain sensor and measurement system for repeated large deformation
A measurement system (10) for detecting repeated large deformation comprising: a fiber optical strain sensor (12) including a flexible polymer optical fiber (POF) (20) in the form of a series of extended loops (40), the loops (40) being flexible to allow rotation in the plane; and notches (41) formed on...

12/09/10 - 20100307256 - Sensory transducer and method
A transducer including a housing; one or more pressure communicating configurations disposed within the housing; one or more selected pressure chambers in operable communication with the one or more pressure communicating configurations; an environmental chamber in operable communication with one or more of the one or more pressure communicating configurations;...

12/09/10 - 20100307257 - Sensor array
An optical fibre strain sensor array comprises several sensor support panels spaced in its longitudinal direction and at least one connecting member extending in the longitudinal direction, which mechanically interconnects the sensor support panels. An optical fibre is supported by the sensor support panels and the connecting member. The optical...

12/02/10 - 20100300209 - Optical strain gauge
The invention relates to a strain gauge, comprising at least one optical waveguide (5) fastened to a thin support (1). The optical waveguide (5) has at least one section (10) with a fiber Bragg grating (6), which serves the detection of strain. The invention is characterized in that the optical...

09/30/10 - 20100242619 - System and method for preventing strain caused errors in fiber optic sensors
An encapsulated fiber Bragg grating sensor is provided wherein the EFL of sensor as well as the coefficient of friction between the sensor and the encapsulating tubing is controlled to minimize measurement errors caused by tensile and compressive strains. A method of manufacturing such a sensor is also provided....

06/24/10 - 20100154557 - Device and method for measuring electromechanical properties and microstructure of nano-materials under stress state
A device for measuring electromechanical properties and microstructure of nano-materials under stress state comprises two bimetallic strips placed on an insulated metal ring plated with insulating paint, wherein the two bimetallic strips are placed in parallel or V-shaped to insulated metal ring on the same plane, one end of each...

06/03/10 - 20100132477 - Integrated device for monitoring deformations of an electrically insulating part and method for manufacturing one such device
A method for manufacturing the foregoing device comprising positioning of a part of an optic fiber in which at least one Bragg grating is formed in a mold to form the electrically insulating part, and molding of the electrically insulating part....

03/11/10 - 20100058877 - Coated optical fibers
The invention relates to coated optical fibers comprising soft primary coatings and to such primary coatings for protecting glass optical fibers having a sufficient high resistance against cavitation. In particular, the primary coatings have a cavitation strength at which a tenth cavitation appears (σ10cav) of at least about 1.0 MPa...

02/18/10 - 20100037700 - Lifting member with load and/or stress measuring means
A lifting member transmits all or part of the lifting force between a lifting appliance and a load to be lifted. The lifting member includes a proximal portion configured to be fixed to the lifting appliance; a distal portion designed to be connected to the load; a longitudinal section, extending...

01/28/10 - 20100018321 - Nsms flight laser detector system
A method includes rotating a rotor, measuring a rotor rotational time for the rotor to complete a revolution, determining a blade interval by dividing the rotor rotational time by a number of blades carried on the rotor, establishing an active hold-off time interval as a percentage of the blade interval...

11/19/09 - 20090282928 - Load cell and system for measuring forces based on optical spectra shifts
A load cell having an optical micro-resonator in a housing formed of high thermally conductive material. Upon application of a force to a surface of the housing, the micro-resonator is squeezed and changes in shape and refractive index, thereby changing the resonant frequency of the micro-resonator and causing a shift...

09/03/09 - 20090217769 - Structural monitoring
Apparatus (10) for monitoring changes in the shape of a hollow structure (20) comprises a flexible elongate support (12), which includes several optical fibre strain sensors (14, 16, 18) each arranged to measure strain in the longitudinal direction of the support (12). The strain sensors (14, 16, 18) are spaced...

08/06/09 - 20090193906 - Composite fibre and related detection system
This invention relates to a composite fibre including at least a first and second component, wherein at least one of the components is an optical fiber, and the components are intertwined....

05/28/09 - 20090133505 - Shear stress measurement apparatus
A shear stress sensor for measuring the shear force of a fluid flowing along a wall. A floating member, flush with the wall, senses a shear force of the flowing fluid. The floating member is mounted by support means to a base element that is placed in the wall, so...

05/21/09 - 20090126501 - Fiber optic strain gage and carrier
The current invention relates to optical gages designed to measure strain on the surface of a test specimen. The gages of this invention is designed to be installed and used in a manner similar to conventional electronic foil strain gages, but to have the advantages of an all-optical gage. The...

05/07/09 - 20090114033 - Stress history recording system
Provided is a stress history recording system for recording a stress history, which includes a light emitting means including a stress-stimulated luminescent material that emits light in response to a mechanical external force, and a recording means for recording a history of a photoreaction generated due to light emission from...