Thermal performance of metal-clad fiber Bragg grating sensors

Lin, Gong‐Hong; Wang, L.; Yang, C. C.; Shih, Ming‐Chang; Chuang, T. J.

doi:10.1109/68.661425

Cited by 74 publications

(27 citation statements)

References 6 publications

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“…where ξ α＋ =η (4) η is the temperature sensitivity coefficient of FBG of no-package. Given one kind of material, theη basically is a constant that is decided by the material.…”

Section: A Temperature Sensitivity Enhancement Of Fbgmentioning

confidence: 99%

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Study and design on a facilitated system of fiber grating sensor

Zhang

Wang

et al. 2005

SPIE Proceedings

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A facilitated fiber Bragg grating detection system for detecting temperature is presented. The scheme uses a processing fiber Bragg grating that is stuck on a cantilever beam and is identical to one used as a sensor to demodulate the temperature signal. A step motor that is controlled by PLC (Programmable Logic Controller) stretches the cantilever beam periodically, and the system of two gratings produces a carrier at this frequency with its phase modulated by the temperature signal applied to the sensing grating. The temperature signal, which is demodulated by this system, is transmitted to PC then processed and displayed in PC. This system's configuration is simple, sensitivity is high, and cost is low.The fiber Bragg grating ( FBG) has gained a considerable research effort since 1989, when the FBG was discovered by Meltz, particularly on systems using these devices for sensing applications because of its ease in handling, low cost ,small size, and inherent advantages incorporated with fiber communication system[1][2] [3]. The basic principle of operation commonly used in a sensor system basing on FBG is to monitor the shift in wavelength of the returned "Bragg" signal with the changes in the measurand (e.g., strain, temperature). The dependence between the temperature drift and the Bragg wavelength shift caused by the thermal expansion of the FBG can be theoretically predicted and has been experimentally verified. To detect such a wavelength shift of a FBG, many FBG sensor configurations have been proposed, such as spectrum analyzer, acousto-optic tunable filter, Fabry-Perot filter, Mach-Zehnder interferometer, matched fiber grating filter, laser-sensor combinations, and so on. In order to reduce cost, complexity and improve detection resolution of the system, we analyze the feasibility of using a FBG filter based on tunable cantilever beam to demodulate of the signal from the sensor FBG and verify the result in theory. Then, one scheme that consists in the filter based technique which uses a second FBG for the interrogation of the signal of temperature from the sensor FBG has been pointed out in this paper, in our scheme, the second FBG is stuck on cantilever beam that is connected to a step motor, which can tune the second FBG.In this paper, we illustrate important points in regard to the proposed FBG temperature detecting system. First, the configuration of demodulation part of the system that uses a matched FBG stuck on cantilever beam. Experimental results show that a fairly high precision of wavelength can indeed be obtained by using the proposed method. Also, we describe the FBG sensor's configuration and parameter of temperature characteristic. The rest of this paper is organized as follows. In Section II, basic theory of temperature sensitivity enhancement of FBG, displacement of the free-end of the cantilever beam, and reflective spectrum correlation of two gratings are given. Experimental results of the system are shown in Section III, the results of both temperature sensitivity enhancement of FBG a...

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“…where ξ α＋ =η (4) η is the temperature sensitivity coefficient of FBG of no-package. Given one kind of material, theη basically is a constant that is decided by the material.…”

Section: A Temperature Sensitivity Enhancement Of Fbgmentioning

confidence: 99%

“…In the operation of FBG temperature sensor, the temperature induced Bragg wavelength shift is around 0.01nm/°C for a 1.3µm or 1.5µm band Bragg grating [4] [5]. In other words, there is a wavelength shift of 0.01nm in the reflected light as the sensor experiences a temperature change of 1°C.…”

Section: A Temperature Sensitivity Enhancement Of Fbgmentioning

confidence: 99%

Study and design on a facilitated system of fiber grating sensor

Zhang

Wang

et al. 2005

SPIE Proceedings

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“…The structure of matching-FBG of temperature sensitivity enhancement According to a simple theory of the FBG of temperature sensitivity enhancement[10][11] , the variation of the wavelength B λ , denoted by B λ ∆ , caused by the temperature change T ∆ can be expressed as the temperature sensitivity coefficient governed by the material. To enhance the temperature sensitivity of the matching-FBG, in our proposed scheme, an assembly is made through fixing an FBG between two polymerProc.…”

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confidence: 99%

FBG-based wavelength-shift detection system with enhanced temperature sensitivity

Zhang

et al. 2005

SPIE Proceedings

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Proposed and demonstrated in this letter is a scheme of fiber Bragg grating (FBG) interrogation system based on thermistance and matching-FBG of temperature sensitivity enhancement. According to the relationship between the period of the matching-FBG and the resistance value of the thermistance, the scheme interrogates the wavelength-shift by adjusting the matching-FBG's temperature and detecting the resistance value of the thermistance. In measured experiments, the results show that the precision of the proposed system is 0.048nm in a range of 5.9nm.FBG sensors have attracted a considerable amount of interests in the last ten years for use in optical-fiber sensingVarious wavelength-shift detection schemes based on FBG sensors have been developed, including the optical filtering, and the interferometry, etc. Some of these schemes have obtained high interrogation resolution of wavelength-shift [4] [5] . However, due to the complex structure and the high cost, these schemes have not been generally applied [6][7] . With the development of FBG sensor's applications, it is important to construct FBG-based wavelength-shift detection systems that feature in low cost, small size, low complexity and high utility. In this letter, we report a novel wavelength-shift detection system based on matching-FBG of temperature sensitivity enhancement and thermistance, which utilizes the relationship between the reflective wavelength of the matching-FBG of temperature sensitivity enhancement and the resistance value of the thermistance.To give a general comprehension, an FBG-sensor system, capable of the demodulation function of wavelength-shift detection, is shown in Fig.1, in which the matching-FBG filtering is the most important technique. BBS coupler FBG sensor IMG Matching-FBG O/E Data detection and disposal FC The wavelengthshift detection stystem Fig.1 The schematic diagram of the FBG-sensor structureIn this system, the Polymer-Packaged FBG sensor is connected with the wavelength-shift detection system. The matching-FBG of temperature sensitivity enhancement is implemented via a FC connector to the coupler and then to Passive Components and Fiber-based Devices II, edited by

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“…The electroless plating is the most commonly used method of coating because of its simplicity and low cost. Li et al [17] used lead cladding to enhance temperature sensitivity of FBG sensor. He found out that metal with much larger thermal expansion coefficient produces better sensitivity performance (five times more) than the bare fibre.…”

Section: Introductionmentioning

confidence: 99%