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| Number | Title | Issue Date |
| 7359586 | Fiber optic strain sensor and associated data acquisition system A fiber optic polarimetric strain sensor and associated data acquisition system capable of all-optical measurements of physical parameters, such as structural strain, gas and liquid pressure, acceleration and vibration, gas and liquid flow rate, and force without fi... | 04/15/2008 |
| 7322250 | System and method for sensing torque on a rotating shaft A system and method relating to the measuring of torque in a rotating shaft is provided. An optical torque sensing system comprises a rotating shaft, wherein a sleeve of photo-elastic material overlays a portion of the shaft. A light emitting component delivers ligh... | 01/29/2008 |
| 7307702 | Color switchable stress-fracture sensor for damage control A color switchable stress/fracture sensor in combination with a structure. The combination apparatus includes a structure requiring stress and/or fracture detection, and at least one elasto-mechanoluminescent material at least partially dispersed in and/or on the st... | 12/11/2007 |
| 7239382 | Polarizing plates grading method In a polarizing plate grading method a first measurement range A1 is chosen on a polarizing plate. After conducting an initial measurement by putting the polarizing plate under X1° C. for Y1 hours, the first measurement range is mea... | 07/03/2007 |
| 7236241 | Method of making a standard tool for calibrating stress analysis measuring devices and a set of the standard tools A method of making a standard tool for calibrating polarimeters that analyze stress in photoelastic material, includes the steps of partially annealing a starting piece of tempered glass so that the starting piece has a retardance below 250 nm/cm, removing a periphe... | 06/26/2007 |
| 7062421 | Method for predicting adhesive interactions using molecular modeling This invention relates to a process for using computerized molecular interaction modeling to predict the adhesive interactions between a substrate and a polymer. The molecular modeling method may be used to predict and select optimal adhesion promoting monomers for ... | 06/13/2006 |
| 6985214 | Method and apparatus for enhancing visualization of mechanical stress Photoelastic elements are formed deliberately with stress concentrations so that, when evaluated with a polariscope, more pronounced isochromatic bands or fringes result when loads are applied to these elements or to assemblies of these elements. A kit of photoelast... | 01/10/2006 |
| 6947137 | System and method for measuring birefringence in an optical material A system and method are described herein for determining the quality of an optical material by measuring and analyzing birefringence (e.g., stress-induced birefringence, inherent birefringence) in the optical material (e.g., glass sheet). The method is a scanning te... | 09/20/2005 |
| 6809803 | Surface topology inspection Apparatus and a method for inspecting a topology of a surface (2) of a structural member (1) are provided. The degree to which a known type of stress has been applied to the member may be ascertained using a Moiré grid (8). The method involves ... | 10/26/2004 |
| 6606147 | Measuring method using photoelastic analysis for finding touching point between ball and track profile The elaborately calculated method of the present invention using photoelastic analysis for finding contact relation between ball and track is characterized in that a photoelastic plate having a semi-circular section is used in measurement by observing con... | 08/12/2003 |
| 5974896 | Structural deflection measurement Apparatus for the measurement of out of plane displacements of a panel of material under test comprises; a laser (2) capable of focusing a laser spot (8) onto the surface of the panel (6) of material; a line generating lens (12) for converting the image o... | 11/02/1999 |
| 5814729 | System for in-situ delamination detection in composites In a system for in-situ delamination detection in composites, the invention employs a system which evaluates the mechanical vibration response of composite material structures. The damping characteristics of the composite structure are extracted from the ... | 09/29/1998 |
| 5450200 | Method of and apparatus for measuring birefringence A part for projecting a measuring light beam onto a sample and a light receiving part are arranged on the same side of a sample surface so that the measuring light beam is concentric with the light receiving part, the measuring light beam which is convert... | 09/12/1995 |
| 5028130 | Method of stress-optical force measurement and measurement device for performing the method A method of stress-optical force measurement where a linearly polarized light ray is guided into a stress-optical measurement array consisting of several measurement members on which the force to be measured acts in a distributed manner. The light ray suc... | 07/02/1991 |
| 4973163 | Method for measuring birefringence The combination of a polarizer and an analyzer, and a sample interposed therebetween are rotated relative to each other to determine the relationship between the angle of rotation and the intensity of light transmitted through the arrangement. The birefri... | 11/27/1990 |
| 4914487 | Photoelasticity determination of a deformation or stress field A method for photoelasticity examination of a stress or strain field comprises successive steps. A two dimensional image of a test-piece is formed which has isochromatic fringes in the form of an array of pixels and the grey level of each pixel is stored ... | 04/03/1990 |
| 4849623 | System and method for determining anisotropy of light-transmitting sheet specimen A system and method for determining the anisotropy of a sample of a light transmitting sheet is disclosed. The surface of the sample is irradiated with a polarized light which is directed through the sample to an analyzer element. The polarizing plane of ... | 07/18/1989 |
| 4812037 | Method and apparatus for optically detecting circuit malfunctions An apparatus for optically detecting electronic circuit malfunctions includes a light transmitting plate member which is adapted to be positioned adjacent to a plurality of individual electronic circuit elements positioned on a printed circuit board. Firs... | 03/14/1989 |
| 4810089 | Photoelastic effect measuring device A photoelastic effect measuring device comprising a single white light source, a prism dispersing light emitted by said white light source and a variable slit device, which selects an arbitrary spectrum of light thus dispersed is disclosed, in which for a... | 03/07/1989 |
| 4733963 | Method of measuring a sound pressure distribution in a solid body due to a ultrasonic probe by using photoelasticity A method for obtaining quantitative data which relates the sound pressure distribution in a body to an ultrasound pulse waveform which propagates through the body, based on photoelastic measurement and analysis. The method involves producing a first image... | 03/29/1988 |
| 4703918 | Apparatus for determination of elastic isodynes and of the general state of birefringence whole field-wise using the device for birefringence measurements in a scanning mode (isodyne polariscope) An apparatus has been developed to experimentally determine the state and amount of birefringence in an arbitrary plane within a birefringent body using an entirely new method. Such information can be used to determine the optical anisotropy in solid and ... | 11/03/1987 |
| 4679933 | Device for birefringence measurements using three selected sheets of scattered light (isodyne selector, isodyne collector, isodyne collimator) A new method and device has been developed to determine experimentally the state and amount of birefringence along any arbitrary direction through a birefringent body. Such information can be used to determine the optical anisotropy of solid and liquid bo... | 07/14/1987 |
| 4655589 | Apparatus for automatic measurement of stress in a transparent body by means of scattered light An apparatus used directly on a flat sheet of transparent material, especially tempered glass, for simultaneous measurement of sign and amplitude of stress across the section of said glass sheet using scattered light. The apparatus allows reliable and rep... | 04/07/1987 |
| 4619681 | Method and apparatus for measurement of stress in float glass The invention relates to the measurement of stresses in float glass. In a process, the stresses in the glass are continuously determined by scanning the glass over its entire width and simultaneously measuring the temperature of the glass at each location... | 10/28/1986 |
| 4584476 | Device for the non-destructive testing of the internal stress state of heat tempered plate glass The internal stress state of a plate of heat tempered plate glass is tested by means of a device which uses a source of polarized monochromatic infrared radiation. This radiation passes through the glass in a point, and the variation of the polarization s... | 04/22/1986 |
| 4523848 | Polariscope In a polariscope including first and second quarter wave plates arranged one on either side of a sample under test, first and second liquid crystal devices are provided adjacent the quarter wave plates and can be switched between two optical conditions to... | 06/18/1985 |
| 4501159 | Contact gauge and method of employing same A contact gauge utilizable for determining contact pressure conditions between two bodies at their interface including a thin plastic sheet capable of memorizing an induced birefringence and a thin, load transmitting member attached to the sheet for induc... | 02/26/1985 |
| 4286843 | Polariscope and filter therefor The filter comprises a multiplicity of light polarizing elements which polarize light in a plurality of planes, and a multiplicity of filtering means associated with the light polarizing elements. In a polariscope, light is directed from a source through ... | 09/01/1981 |
| 4213697 | Phase measuring device An improved phase measuring method and apparatus for measuring the relative hase and amplitude of an applied optical signal beam at a number of points in a plane. The combination of the signal beam and a reference beam are simultaneously directed onto a pa... | 07/22/1980 |
| 4207000 | Waveguide method for determining stress at the convex surface of a body Method comprises (1) introducing a polarized light beam into the convex surface of an optically-transparent body whereby the beam propagates in the body in a guided manner near the surface, (2) extracting at least a portion of the beam from the body throu... | 06/10/1980 |
| 4192610 | Method and device for the measurement of photoelasticity At least four beams of linearly polarized light are produced separately at one and the same point of measurement in a single direction of observation at right angles to a unitary sheet of a specimen of photoelastic material in order to determine the state... | 03/11/1980 |
| 4168911 | Diffractographic and other sensors utilizing diffraction waves A method and devices for sensing changes in separation of a first member relative to a second member, as well as variables causing such changes is disclosed. Electromagnetic waves diffracted by means included in said first member interact with waves from ... | 09/25/1979 |
| 4008960 | Photoelastic strain gauge coating and method of using same The photoelastic strain gauge coating comprises a sheet of photoelastic material of predetermined shape having a multiplicity of minute discontinuities or sets of discontinuities arranged in a predetermined grid. The predetermined shape and grid, together... | 02/22/1977 |
| 3994598 | Photoelastic strain gauge coating The coating comprises a sheet of photoelastic material having a multiplicity of regions, in each of which is a plurality of measuring elements at predetermined angles. Each of the measuring elements has an abutment and a finger in operating contact with e... | 11/30/1976 |
| 3966326 | Method and apparatus for indicating or measuring contact distribution over a surface A method and apparatus are described for indicating or measuring contact pressure distribution over a surface, in which method and apparatus, a pressure-transmitting member having a plurality of point-contact projections is used to transmit the contact pr... | 06/29/1976 |
