Source: http://www.google.com/patents/US7549337?dq=5787449
Timestamp: 2015-02-27 08:37:48
Document Index: 568038369

Matched Legal Cases: ['art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 35', 'art 15', 'art 35', 'art 35']

Patent US7549337 - Method for inspecting peeling in adhesive joint - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA method is disclosed wherein a portion of a sensor part of an optical fiber sensor is embedded in an adhesive between two joined members, and peeling in an adhesive joint of the two members is detected on the basis of measuring optical characteristics from the optical fiber sensor when the optical fiber...http://www.google.com/patents/US7549337?utm_source=gb-gplus-sharePatent US7549337 - Method for inspecting peeling in adhesive jointAdvanced Patent SearchPublication numberUS7549337 B2Publication typeGrantApplication numberUS 11/783,073Publication dateJun 23, 2009Filing dateApr 5, 2007Priority dateApr 6, 2006Fee statusPaidAlso published asUS20070237448Publication number11783073, 783073, US 7549337 B2, US 7549337B2, US-B2-7549337, US7549337 B2, US7549337B2InventorsKeiichi Sato, Hideaki Murayama, Kazuro KageyamaOriginal AssigneeHonda Motor Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (12), Non-Patent Citations (1), Classifications (13), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetMethod for inspecting peeling in adhesive joint
US 7549337 B2Abstract
determining a temperature of the two members during measurement on the basis of the optical characteristics from that portion of the sensor part which is exposed outside of the adhesive;
determining, based on the temperature determined during the measurement, a measurement range in which the optical characteristics from the optical fiber sensor are measured;
vibrating the member by means of the vibration means; and
measuring the variation in the optical characteristics from the optical fiber sensor within the determined measurement range while the member is being vibrated by the vibration means.
2. The method of claim 1, further comprising a step for applying a specific load from the member side, which step is performed together with the vibrating step.
7. A method for detecting peeling of two joined members, comprising:
providing a first database of an optical characteristic of a sensor not embedded in adhesive at various temperatures;
providing a second database of the measured optical characteristic of a sensor embedded in adhesive at various temperatures; and
measuring the optical characteristic of a sensor not embedded in adhesive joining two members;
determining a temperature from the measured optical characteristic based on the first database;
choosing a measurement window for an embedded sensor for the determined temperature from the second database;
vibrating the joined members and measuring an optical characteristic of the embedded sensor; and
determining a state of peeling between the two joined members by comparing the measured optical characteristics of the embedded sensor being vibrated and the chosen measurement window.
8. The method of claim 7, wherein the optical characteristic is the spectrum of reflected light from an optical fiber sensor.
9. A method for detecting peeling of two joined members, comprising:
choosing a measurement window from a database of an optical characteristic of a sensor embedded in adhesive between two joined members for the measured temperature;
vibrating the joined members and measuring the optical characteristic of a sensor embedded in the adhesive between the two joined members; and
determining the state of peeling between the two joined members by comparing the chosen measurement window to the measured optical characteristic of the embedded sensor being vibrated.
10. The method of claim 9, wherein the optical characteristics is the spectrum of reflected light from an optical fiber sensor.
measuring the temperature by measuring an optical characteristic of a sensor not embedded in adhesive between the joined members at various temperatures;
creating a database of the optical characteristic of a sensor not embedded in adhesive between the joined members for each temperature;
measuring the optical characteristic of a sensor not embedded in adhesive between the joined members at various temperatures at an unknown temperature; and
determining the temperature by comparing the optical characteristic of a sensor not embedded in adhesive between the joined members at various temperatures at an unknown temperature with the database of the optical characteristic of a sensor not embedded in adhesive between the joined members at various temperatures. Description
The term �optical fiber sensor� refers to an optical fiber in which a sensor part is formed in part of the core. The sensor part is a diffraction grating, for example. An optical fiber sensor comprising a diffraction grating is referred to as an �optical fiber grating sensor.� The configuration of the sensor part is not limited to a diffraction grating. With an optical fiber sensor, the joining state is measured using changes in optical characteristics resulting from strain in the sensor part.
A precise measuring technique based on an optical fiber sensor is disclosed in �Precise Measuring Technique Based on Optical Fiber Grating� by Shinji Ishikawa, Applied Physics, Vol. 69, pg. 6 (2000), lines 648-654.
Reflectivity R can be calculated from Eq. (2) by using the refractive index change Δn, the grating length L, and the confinement rate ηc of propagated light in the core.
R B=tan h 2(πL�Δn�ηc/λB) (2)
The sensor part 15 s undergoes thermal contraction (or expansion) when the temperature of the sensor part 15 s changes. When the sensor part 15 s undergoes thermal contraction, the refractive index period A decreases to �Λc� as shown in FIG. 4, and the coupling λB decreases according to Eq. (1). Specifically, there is a decrease in the wavelength of the reflected light. When the sensor part 15s undergoes thermal expansion, the result is the opposite of the one described above. The peak wavelength of the spectrum of reflected light from the sensor part 15 s therefore shifts depending on the temperature.
The structure of the fiber grating of the sensor part 35 s of the optical fiber sensor embedded in the adhesive 32 between the joined members composed of the two members 30, 31 is the same as the structure of the sensor part 15 s described in FIG. 3. A period on the order of light is stored in a fiber core of the sensor part 35 s, and the sensor part 35 s has a function for reflecting light of a specific wavelength by using coupling between the forward and reverse modes of propagation through the fiber core. The coupling wavelength λB is expressed by Eq. (1) above by using the effective refractive index ncore and the refractive index period Λ of the propagation mode. Reflectivity R can be calculated from Eq. (2) by using the refractive index change Δn, the grating length L, and the confinement rate ηc of propagated light in the core.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS4262990 *Feb 16, 1979Apr 21, 1981Ichiro KamakuraBinocularUS4782492 *May 5, 1986Nov 1, 1988Polaroid CorporationThermally controllable optical devices and systemUS5250802 *Nov 4, 1991Oct 5, 1993Teledyne Ryan Aeronautical, Division Of Teledyne Industries, Inc.Fiber optic stress sensor for structural jointsUS6616332 *Nov 18, 1999Sep 9, 2003Sensarray CorporationOptical techniques for measuring parameters such as temperature across a surfaceUS6710863 *Jul 1, 2002Mar 23, 2004Kazuo HotateApparatus and method for measuring characteristics of optical fibersUS7041960 *Apr 15, 2004May 9, 2006Honda Motor Co., Ltd.Bond separation inspection method using compressive thermal strain in optical sensor partUS7080940 *May 5, 2004Jul 25, 2006Luxtron CorporationIn situ optical surface temperature measuring techniques and devicesUS20060233484 *Mar 24, 2006Oct 19, 2006Richard Van NesteAdhesive-assembled fiber-optic interferometerJP2001021384A Title not availableJP2005098921A Title not availableJPH02157620A * Title not availableJPH09101255A Title not available* Cited by examinerNon-Patent CitationsReference1Ishikawa High-resolution sensing methods using optical fiber gratings, Oyo Buturi, vol. 69, No. 06, p. 0648-0654 (2000).Classifications U.S. Classification73/588, 385/12, 73/800, 73/150.00A, 73/827International ClassificationG01N29/04, G02B6/00Cooperative ClassificationG02B6/022, G02B6/02204, G01N19/04, G01M11/086European ClassificationG02B6/02G8T2, G01M11/08B4Legal EventsDateCodeEventDescriptionOct 1, 2012FPAYFee paymentYear of fee payment: 4Aug 14, 2012ASAssignmentFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HONDA MOTOR CO., LTD.;REEL/FRAME:028783/0904Effective date: 20120710Owner name: HONDA PATENTS & TECHNOLOGIES NORTH AMERICA, LLC, CApr 5, 2007ASAssignmentOwner name: HONDA MOTOR CO., LTD., JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SATO, KEIICHI;MURAYAMA, HIDEAKI;KAGEYAMA, KAZURO;REEL/FRAME:019212/0018Effective date: 20070327RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services