KR100774372B1 - Sensor for simultaneous measurement of bending and temperature based on sampled chirped fiber bragg grating - Google Patents
Sensor for simultaneous measurement of bending and temperature based on sampled chirped fiber bragg grating Download PDFInfo
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- 238000005452 bending Methods 0.000 title claims abstract description 26
- 238000005259 measurement Methods 0.000 title claims description 11
- 239000000835 fiber Substances 0.000 title abstract description 5
- 239000013307 optical fiber Substances 0.000 claims abstract description 91
- 230000006355 external stress Effects 0.000 claims abstract description 4
- 238000005070 sampling Methods 0.000 claims description 45
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 238000003848 UV Light-Curing Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
- G01D5/35309—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer
- G01D5/35316—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer using a Bragg gratings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
Abstract
Description
도 1은 첩 광섬유 격자의 구조를 나타낸 도면. BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the structure of a chimp optical fiber grating.
도 2는 본 발명에 따른 샘플링 첩 광섬유 격자의 구조를 나타낸 도면. 2 is a view showing a structure of a sampling chief optical fiber grating according to the present invention.
도 3은 본 발명에 따른 샘플링 첩 광섬유 격자의 제조방법을 설명하기 위한 참고도.3 is a reference diagram for explaining a method of manufacturing a sampling chief optical fiber grating according to the present invention.
도 4는 본 발명에 따른 샘플링 첩 광섬유 격자의 투과 특성을 나타낸 그래프.4 is a graph showing the transmission characteristics of the sampling chirp optical fiber grating according to the present invention.
도 5a 내지 도 5c는 캔틸레버의 다양한 실시예를 나타낸 도면.5A-5C illustrate various embodiments of cantilevers.
도 6a, 도 6b 및 도 c는 온도 변화에 따른 샘플링 첩 광섬유 격자의 투과 특성, 파장 변화, 파장 간격의 변화를 각각 나타낸 그래프.6A, 6B, and C are graphs showing the transmission characteristics, the wavelength change, and the change of the wavelength spacing of the sampling chirp optical fiber grating according to temperature change, respectively.
도 7a 및 도 7b는 구부림 변화에 따른 샘플링 첩 광섬유 격자의 투과 특성, 파장 간격의 변화를 각각 나타낸 그래프.7A and 7B are graphs showing changes in transmission characteristics and wavelength spacing of sampling chief optical fiber gratings according to bending changes, respectively.
본 발명은 샘플링 첩 광섬유 격자를 이용한 온도/구부림 동시 측정 센서에 관한 것으로서, 보다 상세하게는 온도와 구부림을 동시에 안정적으로 측정할 수 있는 샘플링 첩 광섬유 격자를 이용한 온도/구부림 동시 측정 센서에 관한 것이다. The present invention relates to a temperature / bending simultaneous measurement sensor using a sampling chirp optical fiber grating, and more particularly, to a temperature / bending simultaneous measurement sensor using a sampling chirp optical fiber grating capable of stably measuring temperature and bending simultaneously.
광섬유 격자(optical fiber grating)는 광섬유 코어의 굴절률을 주기적으로 변조(modualtion)하여 특정 파장의 빛을 반사시키는 광섬유 소자로써 광섬유와의 연결 손실이 작고 파장 선택도가 높아서 현재 광통신용 소자나 광섬유 센서 등으로 활발히 연구되고 있다. 특히, 온도, 스트레인(strain) 등과 같은 물리량 측정에 널리 이용되고 있으며 최근에는, 온도와 스트레인을 동시에 측정하기 위한 광섬유 센서가 개발되고 있다. Optical fiber grating is an optical fiber device that reflects light of a specific wavelength by periodically modulating the refractive index of the optical fiber core. The optical fiber grating has a small connection loss with the optical fiber and a high wavelength selectivity. Is being actively researched. In particular, it is widely used for measuring physical quantities such as temperature, strain, and the like, and recently, optical fiber sensors for simultaneously measuring temperature and strain have been developed.
한편, 온도와 스트레인을 동시에 측정하기 위한 연구는 활발히 진행되고 있으나, 온도와 구부림(bending)을 동시에 측정할 수 있는 센서에 대한 연구는 미진한 상태이다. 또한, 기존의 온도와 스트레인을 동시에 측정하는 광섬유 센서의 경우, 여러 개의 광섬유 격자를 결합하거나 특수한 광섬유를 이용하여 격자를 제조하는 방식을 택함에 따라 크로스토크(cross-talk)가 발생하기 쉽고 삽입 손실이 증가하는 문제가 있다. 그리고, 어븀(Er)이 첨가된 광섬유를 사용하는 광섬유 격자 센서의 경우에는 제조상의 어려움이 상존한다. On the other hand, studies to measure the temperature and strain at the same time are actively conducted, but the research on the sensor that can measure the temperature and bending (bending) at the same time is insufficient. In addition, in the case of a conventional optical fiber sensor that measures temperature and strain simultaneously, crosstalk is likely to occur and insertion loss is caused by combining multiple optical fiber gratings or manufacturing a grating using a special optical fiber. There is a growing problem. In the case of an optical fiber grating sensor using an optical fiber to which erbium (Er) is added, manufacturing difficulties remain.
본 발명은 상기와 같은 문제점을 해결하기 위해 안출한 것으로서, 온도와 구부림을 동시에 안정적으로 측정할 수 있는 샘플링 첩 광섬유 격자를 이용한 온도/구부림 동시 측정 센서를 제공하는데 그 목적이 있다. The present invention has been made to solve the above problems, and an object of the present invention is to provide a temperature / bending simultaneous measurement sensor using a sampling chief optical fiber grating capable of stably measuring temperature and bending at the same time.
본 발명에 따른 샘플링 첩 광섬유 격자를 이용한 온도/구부림 동시 측정 센서는 광섬유의 길이 방향을 따라 일정 간격을 두고 격자군(群)이 형성되어 있으며, 상기 격자군 내의 격자들은 격자 주기가 점차적으로 증가하거나 감소하는 형태로 배열되는 샘플링 첩 광섬유 격자와, 상기 샘플링 첩 광섬유 격자가 장착되는 공간을 제공하고 외부의 응력에 의해 구부림이 가능한 캔틸레버를 포함하여 이루어지는 것을 특징으로 한다. In the temperature / bending simultaneous measurement sensor using the sampling chirp optical fiber grating according to the present invention, grating groups are formed at regular intervals along the length direction of the optical fiber, and grating periods of the grating groups gradually increase or decrease. And a cantilever capable of providing a space in which the sampling chief optical fiber grating is mounted and being bent by external stress.
바람직하게는, 상기 격자군 사이의 간격은 100㎛∼10mm이다. Preferably, the space | interval between the said grid groups is 100 micrometers-10 mm.
바람직하게는, 상기 샘플링 첩 광섬유 격자는 단일 모드 광섬유 상에 첩핑된 위상 마스크를 위치시키고 상기 위상 마스크 전면에 자외선을 조사시켜 첩 광섬유 격자를 형성시킨 다음, 상기 첩 광섬유 격자 상에 진폭 마스크를 위치시키고 상기 진폭 마스크 상에 자외선을 조사하여 형성한다. Preferably, the sampling chirp optical fiber grating is positioned with a phase mask wrapped on a single mode optical fiber and irradiated with ultraviolet light over the phase mask to form a chirp optical fiber grating, and then an amplitude mask is placed on the chirp optical fiber grating. UV light is formed on the amplitude mask.
바람직하게는, 상기 샘플링 첩 광섬유 격자는 두 개의 첩 광섬유 격자가 겹쳐진 형태로 배열된 구조를 갖는다. Preferably, the sampling chirp optical fiber grating has a structure in which two chirp optical fiber gratings are arranged in a superimposed manner.
바람직하게는, 상기 캔틸레버는 삼각형 형상 또는 곡률을 갖는 삼각형 형상을 갖는다. Preferably, the cantilever has a triangular shape with a triangular shape or curvature.
본 발명에 따른 기술적 사상의 핵심은 샘플링 첩 광섬유 격자를 이용함에 있다. 따라서, 본 발명에 적용되는 샘플링 첩 광섬유 격자에 대해 먼저 상세히 설명하기로 한다. The core of the technical idea according to the present invention is to use a sampling chief optical fiber grating. Therefore, the sampling chirp optical fiber grating applied to the present invention will be described first in detail.
일반적으로 광섬유 격자(optical fiber grating)라 함은 단일 모드 광섬유 상에 마스크를 이용하여 자외선을 선택적으로 조사하여 광섬유의 코어(core)에 다수의 격자를 형성시킨 것을 말하며, 이 때 형성된 격자는 통상, 일정 간격을 갖는 브래그 격자(Bragg grating)를 의미한다. In general, an optical fiber grating refers to a plurality of gratings formed on a core of an optical fiber by selectively irradiating ultraviolet rays using a mask on a single mode optical fiber. It means Bragg grating with a certain interval.
한편, 첩 광섬유 격자(chirped optical fiber grating)는 광섬유의 코어에 형성되는 격자가 첩(chirp)을 갖도록 한 것을 말한다. 즉, 도 1에 도시한 바와 같이 광섬유 내의 격자(101)가 일정 간격으로 배열되지 않고 격자 주기가 점차적으로 증가하거나 감소되도록 격자가 배열된 것이 첩 광섬유 격자이다. On the other hand, chirped optical fiber grating (chirped optical fiber grating) means that the grating formed in the core of the optical fiber has a chirp (chirp). That is, as shown in Fig. 1, the lattice is arranged so that the lattice period is gradually increased or decreased without the
본 발명은 기본적으로 이와 같은 첩 광섬유 격자를 이용한다. 더욱 상세하게는 샘플링된(sampled) 첩 광섬유 격자를 이용함을 특징으로 한다. 여기서, 샘플링이라 함은 다음을 의미한다. The present invention basically uses such a chirped optical fiber grating. More specifically, it uses a sampled chirped fiber grating. Here, sampling means the following.
전술한 바와 같이, 첩 광섬유 격자는 격자 주기가 점차적으로 증가 또는 감소되도록 격자가 배열된 것을 의미하는데 이 때, 격자의 한 주기는 0.1∼1㎛ 정도이다. 본 발명에 따른 샘플링 첩 광섬유 격자는 상기와 같은 격자 주기를 갖는 첩 광섬유 격자에 대해 장주기의 격자 주기를 갖도록 가공한 것을 말한다. 즉, 본 발명에 따른 샘플링 첩 광섬유 격자는 도 2에 도시한 바와 같이 길이 방향을 따라 일 정 간격(L)을 두고 격자군(群)(A)이 존재하거나 존재하지 않는 것을 말한다. 여기서, 상술한 일정 간격(L)은 상기 장주기에 상응하는 것으로서, 바람직하게는 100㎛∼10mm 정도이다.As described above, a chirped optical fiber grating means that the gratings are arranged such that the grating period is gradually increased or decreased, wherein one period of the grating is about 0.1 to 1 m. The sampling chirp optical fiber grating according to the present invention refers to one processed to have a long period grating period for the chirp optical fiber grating having the above grating period. That is, the sampling chirp optical fiber grating according to the present invention refers to the presence or absence of the grating group A at a predetermined interval L along the longitudinal direction as shown in FIG. 2. Here, the above-mentioned constant interval L corresponds to the long period, preferably about 100 μm to 10 mm.
이와 같은 샘플링 첩 광섬유 격자는 일 실시예로 다음과 같은 방법을 통해 제조될 수 있다. 먼저, 단일 모드 광섬유 상에 첩핑(chirping)된 위상 마스크(phase mask)를 위치시키고 상기 위상 마스크 전면에 자외선을 조사시켜 도 3의 (b)와 같은 첩 광섬유 격자를 형성시킨다. 그런 다음, 상기 첩 광섬유 격자 상에 100㎛∼10mm의 개구부가 일정 간격으로 배치된 진폭 마스크(amplitude mask)를 위치시키고 상기 진폭 마스크 상에 자외선을 조사시키면 도 3의 (a)와 같은 형태로 장주기의 격자 주기가 형성되는데, 이를 첩 광섬유 격자 상에 적용시킴에 따라 최종적으로는 도 2와 같은 형태의 격자 즉, 샘플링 첩 광섬유 격자가 형성된다. Such a sampling chirp optical fiber grating may be manufactured by the following method in one embodiment. First, a chirped phase mask is placed on a single mode optical fiber and ultraviolet rays are irradiated on the entire surface of the phase mask to form a chirped optical fiber grating as shown in FIG. Then, an amplitude mask having an opening of 100 μm to 10 mm at regular intervals is placed on the concave optical fiber grating, and ultraviolet rays are irradiated onto the amplitude mask to form a long period as shown in FIG. The lattice period of is formed, and as a result of applying it on the chirped optical fiber grating, a grating of the shape as shown in FIG.
본 발명에 따른 샘플링 첩 광섬유 격자의 형태를 정리하면, 길이 방향을 따라 일정 간격(L)을 두고 격자군(群)(A)이 배열되며, 상기 격자군 내의 격자들은 격자 주기가 첩의 형태 즉, 길이 방향을 따라 증가하거나 감소하는 형태로 배열됨을 특징으로 한다. 이와 같이, 본 발명에 따른 샘플링 첩 광섬유 격자는 일정 간격을 두고 격자군이 배열되고 격자 주기가 첩을 형태를 띰에 따라 다채널 공진 파장을 갖게 된다. 도 4는 본 발명에 따른 샘플링 첩 광섬유 격자의 투과 특성을 나타낸 그래프로서, 도 4에 도시한 바와 같이 본 발명에 따른 샘플링 첩 광섬유 격자는 일반적인 단주기 또는 장주기 광섬유 격자와는 달리 다채널 공진 파장을 갖음을 알 수 있다. According to the present invention, the shape of the sampling chief optical fiber grating according to the present invention is arranged, and the lattice group A is arranged at a predetermined distance L along the longitudinal direction, and the lattice periods of the lattice periods in the lattice group are the shape of the chirp. It is characterized in that it is arranged in the form of increasing or decreasing along the longitudinal direction. As described above, the sampling chirp optical fiber grating according to the present invention has a multi-channel resonant wavelength as the lattice groups are arranged at regular intervals and the lattice period takes the form of the chirp. 4 is a graph illustrating the transmission characteristics of the sampling chief optical fiber grating according to the present invention. As shown in FIG. 4, the sampling chirp optical fiber grating according to the present invention has a multi-channel resonant wavelength unlike a general short or long period optical fiber grating. It can be seen that.
이와 같은 샘플링 첩 광섬유 격자를 통해 구부림 또는 온도 변화의 물리량에 대해 용이하게 측정할 수 있게 되는데, 구체적으로 외부의 온도가 변화하는 경우 첩 비율은 변화하지 않는 상태에서 격자 주기만 변화됨에 따라 변화된 격자 주기를 통해 온도를 측정할 수 있게 되며, 외부로부터 구부림이 가해지는 경우 격자 자체에 변형이 발생되어 첩 비율이 변화되고 이에 따라, 다채널 공진 파장들의 파장 간격(wavelength spacing)이 변화되어 이를 통해 구부림을 측정할 수 있게 된다. Through this sampling chirp fiber grating, it is possible to easily measure the physical quantity of bending or temperature change. Specifically, when the outside temperature changes, the lattice period changed as only the lattice period is changed while the chirp ratio does not change. The temperature can be measured through the bending, and when the bending is applied from the outside, deformation occurs in the grating itself, thereby changing the chirp ratio, thereby changing the wavelength spacing of the multi-channel resonant wavelengths, thereby measuring the bending. You can do it.
이상과 같은 샘플링 첩 광섬유 격자의 특성을 구체화시키고 실효화하기 위해 본 발명은 샘플링 첩 광섬유 격자를 캔틸레버(cantilever)(501) 상에 장착한 이른바, 샘플링 첩 광섬유 격자를 이용한 온도/구부림 동시 측정 센서를 제안한다. 상기 캔틸레버는 외부의 응력에 의해 구부림이 가능해지는 제반 부재를 의미하는 것으로 특정 재료에 의해 한정되지 않으며, 캔틸레버의 형상은 외부의 구부림에 대해 스트레인 구배(strain gradient)를 안정적으로 유도하기 위해 도 5a에 도시한 삼각형의 형태 또는 도 5b에 도시한 삼각형의 각 변이 곡률을 갖는 삼각형의 형태이거나 도 5c에 도시한 바와 같이 직육면체의 형상을 갖고 내부에 샘플링 첩 광섬유 격자가 위치될 수도 있다. 여기서, 상기 캔틸레버 상에 샘플링 첩 광섬유 격자를 장착하는 방법은 통상의 광섬유 격자와 캔틸레버의 결합 방법을 따른다. 예를 들어, 캔틸레버 상에 샘플링 첩 광섬유 격자를 구비시키고 샘플링 첩 광섬유 격자를 포함한 캔틸레버 상에 자외선 경화 에폭시를 일정 두께로 바른 다음, 자외선에 노출시키게 되면 상기 캔틸레버와 샘플링 광섬유 격자는 견고하게 결합하게 된다.In order to embody and invalidate the characteristics of the sampling chief optical fiber grating as described above, the present invention provides a so-called temperature / bending simultaneous measurement sensor using a sampling chief optical fiber grating, which is mounted on a
한편, 본 발명의 일 실시예에 따른 샘플링 첩 광섬유 격자를 이용한 온도/구부림 동시 측정 센서의 실험 결과를 다음과 같다. 도 6a, 도 6b 및 도 c는 온도 변화에 따른 샘플링 첩 광섬유 격자의 투과 특성, 파장 변화, 파장 간격의 변화를 각각 나타낸 그래프이고, 도 7a 및 도 7b는 구부림 변화에 따른 샘플링 첩 광섬유 격 자의 투과 특성, 파장 간격의 변화를 각각 나타낸 그래프이다. On the other hand, the experimental results of the temperature / bending simultaneous measurement sensor using a sampling chirp optical fiber grating according to an embodiment of the present invention are as follows. 6a, 6b and c are graphs showing the transmission characteristics, the wavelength change, and the change of the wavelength spacing of the sampling chief optical fiber grating according to the temperature change, respectively, and FIGS. 7a and 7b are the transmission of the sampling chief optical fiber grating according to the bending change. It is a graph which shows the change of a characteristic and wavelength space, respectively.
먼저, 온도 변화를 살펴보면 도 6a 및 도 6b에 도시한 바와 같이 온도가 상승됨에 따라 열적 계수는 변화하지만 격자의 첩 비율이 변화되지 않기 때문에 각각의 채널의 공진 파장이 장파장으로 이동됨을 알 수 있다. 여기서, 온도에 따른 파장 변화는 약 0.035nm/℃ 로 측정되었다. 한편, 온도 상승에 의해 공진 파장이 변화되더라도 6c에 도시한 바와 같이 파장 간격은 변화되지 않고 일정하게 유지됨을 알 수 있다. 구부림 변화를 인가한 경우, 샘플링 첩 광섬유 격자에 스트레인이 유도되어 첩 비율이 변화되고 이에 따라, 도 7a 및 도 7b에 도시한 바와 같이 다채널 공진 파장들 사이의 파장 간격이 변화된다. 이 때, 구부림 변화에 따른 파장 간격의 변화는 -0.56nm/m-1로 측정되었으며, 구부림 변화의 측정은 압축 스트레인(compressive strain)이 작용되는 면을 기준으로 하였다. First, referring to the temperature change, as shown in FIGS. 6A and 6B, as the temperature increases, the thermal coefficient changes, but the lattice chirp ratio does not change, and thus the resonance wavelength of each channel is shifted to a long wavelength. Here, the wavelength change with temperature was measured at about 0.035 nm / ° C. On the other hand, even if the resonance wavelength is changed by the temperature rise, as shown in 6c, it can be seen that the wavelength interval is not changed and is kept constant. When a bending change is applied, strain is induced in the sampling chirp optical fiber grating to change the chirp ratio, thereby changing the wavelength spacing between the multichannel resonant wavelengths as shown in Figs. 7A and 7B. At this time, the change in the wavelength spacing according to the bending change was measured as -0.56nm / m -1 , and the measurement of the bending change was based on the surface on which the compressive strain is applied.
한편, 이상의 설명을 통해 도 2와 같은 샘플링 첩 광섬유 격자 구조를 제시하였으나 본 발명의 다른 실시예에 따르면 도 2의 격자 구조 이외에 다른 형태의 샘플링 첩 광섬유 격자 구조의 구성이 가능하다. 즉, 상기와 같은 장주기 변조를 수행하지 않고 두 개의 첩 광섬유 격자를 서로 겹치도록 형성시켜 다른 형태의 샘플링 첩 광섬유 격자를 형성할 수도 있다. 이 경우, 위상 마스크를 이용하여 첩 광섬유 격자를 형성시킨 상태에서 해당 위상 마스크를 일정 거리 쉬프트시킨 후 재차 자외선을 조사하여 샘플링 첩 광섬유 격자를 제조할 수 있다. Meanwhile, although the sampling chief optical fiber grating structure as shown in FIG. 2 has been presented through the above description, according to another embodiment of the present invention, other types of sampling chirp optical fiber grating structures may be configured in addition to the grating structure of FIG. That is, two chirped optical fiber gratings may be formed to overlap each other without performing long-period modulation as described above, thereby forming another type of sampling chirp optical fiber grating. In this case, after the phase mask is shifted by a certain distance in the state where the chirp optical fiber grating is formed using the phase mask, the sampling chief optical fiber grating can be manufactured by irradiating ultraviolet rays again.
본 발명에 따른 샘플링 첩 광섬유 격자를 이용한 온도/구부림 동시 측정 센서는 다음과 같은 효과가 있다. The temperature / bending simultaneous measurement sensor using the sampling chirp optical fiber grating according to the present invention has the following effects.
첩 광섬유 격자에 장주기 변조를 적용하여, 광섬유의 길이 방향으로 장주기에 상응하는 만큼의 간격을 두고 격자들이 반복적으로 배치되고 해당 격자들은 첩(chirp)을 갖도록 함으로써 온도와 구부림을 동시에 안정적으로 측정할 수 있게 된다. 또한, 하나의 광섬유 격자를 이용하여 센서를 구현함에 따라 센서 구조를 간단하게 구성할 수 있게 된다. By applying long-period modulation to the chirped fiber grating, the gratings are repeatedly placed at intervals corresponding to the long period in the longitudinal direction of the optical fiber, and the gratings have chirps so that temperature and bending can be stably measured simultaneously. Will be. In addition, by implementing a sensor using a single optical fiber grating, it is possible to simply configure the sensor structure.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102221333A (en) * | 2011-04-06 | 2011-10-19 | 中国计量学院 | Temperature-insensitive fiber bragg grating (FBG) displacement sensor with double-isosceles-triangle simply-supported-beam structure |
| KR101343954B1 (en) | 2012-04-25 | 2013-12-24 | 한국과학기술연구원 | Optical fiber and, sensor system and sensing method using the same |
| CN104089927A (en) * | 2014-07-23 | 2014-10-08 | 中国计量学院 | Temperature insensitive solution concentration sensor based on semi-corrosion optical fiber grating |
| KR101559151B1 (en) | 2014-01-07 | 2015-10-12 | 호남대학교 산학협력단 | distributed temperature sensor based on a V-grooved single mode optical fiber |
| KR20210154025A (en) | 2020-06-11 | 2021-12-20 | 연세대학교 산학협력단 | Bragg Grating Based Optical Fiber Sensor Measuring Inflection Point Vector of Chiral Motion and Manufacturing Method Thereof |
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| US20040161197A1 (en) * | 2003-02-04 | 2004-08-19 | Teraxion Inc. | Adjustable chromatic dispersion compensator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221333A (en) * | 2011-04-06 | 2011-10-19 | 中国计量学院 | Temperature-insensitive fiber bragg grating (FBG) displacement sensor with double-isosceles-triangle simply-supported-beam structure |
| KR101343954B1 (en) | 2012-04-25 | 2013-12-24 | 한국과학기술연구원 | Optical fiber and, sensor system and sensing method using the same |
| KR101559151B1 (en) | 2014-01-07 | 2015-10-12 | 호남대학교 산학협력단 | distributed temperature sensor based on a V-grooved single mode optical fiber |
| CN104089927A (en) * | 2014-07-23 | 2014-10-08 | 中国计量学院 | Temperature insensitive solution concentration sensor based on semi-corrosion optical fiber grating |
| KR20210154025A (en) | 2020-06-11 | 2021-12-20 | 연세대학교 산학협력단 | Bragg Grating Based Optical Fiber Sensor Measuring Inflection Point Vector of Chiral Motion and Manufacturing Method Thereof |
| US11614580B2 (en) | 2020-06-11 | 2023-03-28 | Uif (University Industry Foundation), Yonsei University | Bragg grating based optical fiber sensor which is capable of measuring inflection point vector of chiral motion and manufacturing method thereof |
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