KR20020021706A - Compsite material reinforcement structure including optical fiber grating sensor - Google Patents
Compsite material reinforcement structure including optical fiber grating sensor Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/243—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using means for applying force perpendicular to the fibre axis
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- E—FIXED CONSTRUCTIONS
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- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
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Abstract
본 발명은 광섬유 격자 센서를 내장시켜 스트레인 변화를 진단하는 자기 진단형 복합재료 보강 구조물에 관한 것이다.The present invention relates to a self-diagnostic composite reinforcement structure that incorporates an optical fiber grating sensor to diagnose strain change.
본 발명에 의한 복합재료 보강 구조물은 보강 구조물의 사용시 생기는 변형의 크기를 측정하는 광섬유 격자 센서를 내장한 복합재료 보강체; 및 상기 보강 구조물 외부에 상기 광섬유 격자 센서의 신호를 처리하는 신호처리 수단을 포함함을 특징으로 한다.Composite reinforcement structure according to the present invention is a composite material reinforcement having a built-in optical fiber grating sensor for measuring the size of the deformation generated when using the reinforcement structure; And signal processing means for processing a signal of the optical fiber grating sensor outside the reinforcing structure.
본 발명에 의하면, 구조물의 스트레인 변화를 항상 확인할 수 있으며, 첩 격자를 필터로 사용하기 때문에 온도 의존성을 배제하고 절대량의 스트레인 측정이 가능하다.According to the present invention, the strain change of the structure can always be confirmed, and since the chirp grating is used as a filter, it is possible to measure the absolute amount of strain without the temperature dependence.
Description
본 발명은 복합재료 보강 구조물에 관한 것으로, 특히 광섬유 격자 센서를 내장시켜 스트레인 변화를 진단하는 자기 진단형 복합재료 보강 구조물에 관한 것이다.The present invention relates to a composite reinforcing structure, and more particularly, to a self-diagnostic composite reinforcing structure for diagnosing strain change by embedding a fiber grating sensor.
종래에는 단순 복합재료 보강재를 사용하는데 이는 단순히 경험적인 계산치에 의해서만 설계되어지기 때문에 과도하게 설계되었는지 제대로 작동이 되고 있는지를 확인할 길이 없다.Conventionally, simple composite reinforcements are used, which are designed only by empirical calculations, so there is no way to determine whether they are overdesigned or functioning properly.
그리고, 이런 보강기술이 보편화 된지 얼마되지 않았기 때문에 내구성, 피로특성, 경시변화에 대한 데이터가 충분하지 않기 때문에 항상 성능을 체크할 수 있는 툴이 필요하다.And since this reinforcement technique is not so common, there is not enough data on durability, fatigue characteristics, and changes over time, so a tool that can always check performance is needed.
도 1a는 탄소섬유를 보강한 보구조물 또는 슬랩구조물의 단면을 도시한 것이고, 도 1b는 탄소섬유를 보강한 기둥구조물의 단면을 도시한 것이다.FIG. 1A illustrates a cross section of a carbon fiber reinforced beam structure or slab structure, and FIG. 1B illustrates a cross section of a carbon fiber reinforced column structure.
이러한 탄소섬유시트의 경우 실험에 의하면 현재 maker에서 추천하고 있는 방식대로 설계하여 사용할 경우 보통 섬유가 끊어지기보다는 경계면에서 delanination이 생긴다. 이는 섬유보다는 접착 폴리머가 약하기 때문인데 이 경우 실제 구조물에서는 파괴가 일어나거나 상당한 시간이 경과되어 눈으로 확인하기 전까지는 알 수 없다,In the case of the carbon fiber sheet, experiments show that when designed and used in the way currently recommended by the maker, delanination occurs at the interface rather than breaking the fiber. This is because the adhesive polymer is weaker than the fiber, in which case it is not known until the destruction occurs in the actual structure or a considerable amount of time has elapsed.
본 발명이 이루고자하는 기술적 과제는 탄소섬유시트나 유리섬유계 복합재료 구조보강재료의 성능 향상을 확인하기 위하여 스트레인 레벨의 절대 값을 측정할 수 있는 광섬유 격자 센서를 내장한 자기진단형 복합재료 보강구조물 및 그 측정장치를 제공함에 있다.The technical problem to be achieved by the present invention is a self-diagnosis composite reinforcement structure with a built-in optical fiber grating sensor that can measure the absolute value of the strain level in order to confirm the performance improvement of the carbon fiber sheet or glass fiber composite composite structural reinforcement And to provide a measuring device.
도 1a는 탄소섬유를 보강한 보구조물 또는 슬랩구조물의 단면을 도시한 것이고, 도 1b는 탄소섬유를 보강한 기둥구조물의 단면을 도시한 것이다.FIG. 1A illustrates a cross section of a carbon fiber reinforced beam structure or slab structure, and FIG. 1B illustrates a cross section of a carbon fiber reinforced column structure.
도 2는 본 발명에 의한 광섬유 격자 센서 내장형 복합재료 보강구조물의 단면을 도시한 것이다.Figure 2 shows a cross-section of the optical fiber grating sensor embedded composite reinforcement structure according to the present invention.
상기 기술적 과제를 해결하기 위한 본 발명에 의한 복합재료 보강 구조물은 보강 구조물의 사용시 생기는 변형의 크기를 측정하는 광섬유 격자 센서를 내장한 복합재료 보강체; 및 상기 보강 구조물 외부에 상기 광섬유 격자 센서의 신호를 처리하는 신호처리 수단을 포함함을 특징으로 한다.Composite material reinforcement structure according to the present invention for solving the above technical problem is a composite material reinforcement having a built-in optical fiber grating sensor for measuring the size of the deformation generated when using the reinforcement structure; And signal processing means for processing a signal of the optical fiber grating sensor outside the reinforcing structure.
또한, 상기 광섬유 격자 센서는 대역폭이 2nm이상인 광섬유 첩 격자임을 특징으로 한다.In addition, the optical fiber grating sensor is characterized in that the optical fiber chirp grating having a bandwidth of 2nm or more.
또한, 상기 신호처리 수단은 광원; 상기 광원로부터 출력되는 빛을 전달받아 상기 구조물에 가해진 압력에 따라 센서의 반사파장이 변화되는 광섬유 격자와 동일한 특성을 갖도록 하는 광섬유 격자필터; 및 상기 광섬유 격자필터를 통과하는 신호를 검파하는 검파부를 포함함을 특징으로 한다.In addition, the signal processing means includes a light source; An optical fiber grating filter receiving the light output from the light source to have the same characteristics as an optical fiber grating whose reflection wavelength of the sensor changes according to the pressure applied to the structure; And a detector configured to detect a signal passing through the optical fiber grating filter.
또한, 상기 신호처리 수단은 상기 보강 구조물에 내장시켜 사용함을 특징으로 한다.In addition, the signal processing means is characterized in that it is used embedded in the reinforcing structure.
이하 도면을 참조하여 본 발명을 상세히 설명하기로 한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
먼저, 본 발명에 사용되는 광섬유 격자센서에 대하여 설명하기로 한다.First, the optical fiber grating sensor used in the present invention will be described.
광섬유 격자 센서는 광민감성 광섬유와 UV광원 및 위상마스크등을 이용하여 광섬유 센서를 만들 수 있다. 190nm-250nm대의 파장을 발생하는 레이저로 빛의 회절 및 간섭현상을 일으킬 수 있는 위상 마스크를 광섬유에 일정한 주기로 굴절율의 변조를 발생시킨다. 발생된 일정한 주기의 격자는 특정한 조건에 따라 브레그 파장이라고 하는 반사파장을 만들어 낸다. 이를 이용하여 광통신용소자 즉, 대역통과필터, 대역저지필터, 파장분별기, 광섬유 레이저, 분산보상용 소자로 사용하거나, 광센서로 사용되는데 브레그 반사파장은 광섬유에 주어지는 스트레인(strain) 및 온도에 따라 변화하는 특징을 이용한다.Fiber-optic grating sensors can make optical fiber sensors using light-sensitive optical fibers, UV light sources, and phase masks. A laser that generates wavelengths in the 190nm-250nm range generates a phase mask that can cause diffraction and interference of light on the optical fiber at regular intervals. The generated periodic grating produces a reflected wave called the breg wavelength under certain conditions. It is used as an optical communication device such as band pass filter, band stop filter, wavelength classifier, fiber laser, and dispersion compensation device, or as an optical sensor.Breg reflected wavelength is applied to the strain and temperature given to the optical fiber. Use features that change accordingly.
도 2는 본 발명에 의한 복합재료 보강 구조물을 도시한 것으로, 보강 구조물(210), 광섬유 격자 센서(220), 광섬유 격자필터(230), 광원(240) 및 검파부(250)로 이루어진다.2 illustrates a composite reinforcing structure according to the present invention, and includes a reinforcing structure 210, an optical fiber grating sensor 220, an optical fiber grating filter 230, a light source 240, and a detector 250.
보강 구조물(210)은 탄소섬유나 유리섬유계 복합재료가 포함된 구조물이다.The reinforcing structure 210 is a structure containing a carbon fiber or glass fiber based composite material.
광섬유 격자 센서(220)는 상기 보강 구조물의 사용시 생기는 변형의 크기를 측정하는데 사용되는 것으로, 본 발명에서는 대역폭이 2nm이상인 광섬유 첩 (chirp) 격자를 사용한다.The optical fiber grating sensor 220 is used to measure the magnitude of deformation occurring when the reinforcing structure is used. In the present invention, an optical fiber chirp grating having a bandwidth of 2 nm or more is used.
광섬유 격자필터(230)는 광원(240)로부터 출력되는 빛을 전달받아 보강 구조물(210)에 가해진 압력에 따라 센서의 반사파장이 변화되는 광섬유 격자와 동일한 특성을 갖도록 한다.The optical fiber grating filter 230 receives the light output from the light source 240 to have the same characteristics as the optical fiber grating in which the reflection wavelength of the sensor changes according to the pressure applied to the reinforcing structure 210.
광원(240)은 광섬유 격자 센서(220)에 가하는 빛을 출력한다.The light source 240 outputs light applied to the optical fiber grating sensor 220.
검파부(250)는 광섬유 격자필터(230)를 통과하는 신호를 검파한다.The detector 250 detects a signal passing through the optical fiber grating filter 230.
상술한 구성에 의거하여 본 발명의 동작을 상세히 설명하기로 한다.Based on the above configuration, the operation of the present invention will be described in detail.
보강구조물(210)에 내장된 광섬유 격자 센서(220)에 압력을 가하게 되면, 이때 발생한 파장의 변화는 압력이 가해지지 않은 브레그 파장과 압력이 가해진 센서에서의 브레그 파장이 중복 또는 겹쳐 있는 형태로 반사되어 온다.When pressure is applied to the optical fiber grating sensor 220 embedded in the reinforcement structure 210, the change in wavelength generated is a form in which the Bregg wavelength without pressure and the Bregg wavelength at the pressure sensor are overlapped or overlapped. It is reflected by.
반사된 신호는 압력이 가해지지 않았을 경우는 광섬유 격자 센서(220)에서는 동일한 파장을 반사시키며, 압력이 가해지면 가해진 광섬유 격자센서(220)로부터 브레그 파장이 변화하고 반사되어 오는 신호의 선폭이 변화한다.The reflected signal reflects the same wavelength in the optical fiber grating sensor 220 when no pressure is applied, and the breg wavelength is changed from the applied optical fiber grating sensor 220 when the pressure is applied and the line width of the reflected signal is changed. do.
결국, 보강구조물(210)에 전달되는 압력이 광섬유 격자 센서(220)에 가해지면 반사되어 돌아오는 브레그 파장의 파장폭을 변화시켜 이를 압력의 무게로 환산하여 보강구조물(210)의 압력 레벨을 측정하게 된다.As a result, when the pressure transmitted to the reinforcing structure 210 is applied to the optical fiber grating sensor 220, the wavelength of the breg wavelength reflected back is changed and converted into the weight of the pressure, thereby converting the pressure level of the reinforcing structure 210. Will be measured.
또한, 본 발명에서는 스트레인 레벨을 쉽게 측정할 수 있는 첩 격자 광섬유 센서를 복합재료 보강체안에 내장시켜 항상 측정할 수 있도록 하였는데, 첩 격자광섬유 센서를 채택한 이유는 다른 센서들을 절대량의 스트레인 변화를 측정할 수 없으며 일반 격자 광섬유 센서는 신호처리시 그 안에 사용되는 Fabry-Perot 필터의 구동장치에 PZT를 사용하기 때문에 온도 의존성이 커서 온도에 따른 drift가 생겨 절대량을 측정하기가 어려운데 본 발명에서는 첩 격자를 필터로 사용하기 때문에 온도의존성을 배제하고 절대량의 스트레인 측정이 가능하다.In addition, in the present invention, the chirp grating optical fiber sensor, which can easily measure the strain level, is embedded in the composite reinforcement to always measure the reason. The reason why the chirp grating optical fiber sensor is adopted is that other sensors can measure the absolute change in strain. In general, the grating fiber optic sensor uses PZT for the drive of the Fabry-Perot filter used in the signal processing, so it is difficult to measure the absolute amount due to drift due to temperature due to temperature dependence. As a result, the absolute amount of strain can be measured without temperature dependence.
도면과 명세서는 단지 본 발명의 예시적인 것으로서, 이는 단지 본 발명을 설명하기 위한 목적에서 사용된 것이지 의미한정이나 특허청구범위에 기재된 본 발명의 범위를 제한하기 위하여 사용된 것은 아니다. 그러므로 본 기술 분야의 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 타 실시예가 가능하다는 점을 이해할 것이다. 따라서, 본 발명의 진정한 기술적 보호 범위는 첨부된 특허청구범위의 기술적 사상에 의해 정해져야 할 것이다.The drawings and specification are merely exemplary of the invention, which are used for the purpose of illustrating the invention only and are not intended to limit the scope of the invention as defined in the appended claims or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.
본 발명에 의하면, 구조물의 스트레인 변화를 항상 확인할 수 있으며, 첩 격자를 필터로 사용하기 때문에 온도 의존성을 배제하고 절대량의 스트레인 측정이 가능하다.According to the present invention, the strain change of the structure can always be confirmed, and since the chirp grating is used as a filter, it is possible to measure the absolute amount of strain without the temperature dependence.
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| KR100956650B1 (en) * | 2008-01-15 | 2010-05-10 | 한국전력공사 | Measurement method of nuclear containment structure using optical fiber |
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| KR970002278A (en) * | 1995-06-30 | 1997-01-24 | 우덕창 | Structure Maintenance System Using Fiber Optic Gyro Sensor |
| KR100301775B1 (en) * | 1999-05-20 | 2001-09-22 | 김진찬 | Optical sensor for measuring deformation of institution |
| KR100329042B1 (en) * | 1999-08-03 | 2002-03-18 | 윤덕용 | Fiber ortic strain sensing system |
| KR20010018984A (en) * | 1999-08-24 | 2001-03-15 | 김진찬 | Sensing system using by an optical-fiber bragg-grating |
-
2000
- 2000-09-16 KR KR10-2000-0054415A patent/KR100380639B1/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100756056B1 (en) * | 2006-11-21 | 2007-09-07 | 전남대학교산학협력단 | Fiber optic composite stranded wire. Manufacturing method and strain measurement method of optical fiber composite strand |
| KR100956650B1 (en) * | 2008-01-15 | 2010-05-10 | 한국전력공사 | Measurement method of nuclear containment structure using optical fiber |
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| Publication number | Publication date |
|---|---|
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