A passive wavelength demodulation system for guided-wave Bragg grating sensors

Melle, Serge; Liu, K.; Measures, Raymond M.

doi:10.1109/68.136506

Cited by 286 publications

(120 citation statements)

References 4 publications

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“…The light reflected by periodic variations of refractive index of the Bragg grating having a central wavelength λ G is given by λ G = 2nΛ, where n is the effective refractive index of the core and Λ is the periodicity of the refractive index modulation. When the strain is applied there will be a shift from this peak wavelength, which can be calculated using the relation, ∆λ G = λ G (1-ρ α )∆ε, where ρ α is the photo elastic coefficient of the fibre given by [6] A ratiometric wavelength measurement system with an edge filter [7,8] can be used to measure the wavelength shift induced by the strain. The schematic of the experimental system to test the FBG demodulation system is shown in Fig.…”

Section: Strain Measurement Using Fbg Strain Sensor Systemmentioning

confidence: 99%

A method to measure reference strain in FBG strain sensor interrogation system involving actuators

Rajan

Semenova

Wang

et al. 2007

Micro & Optical Tech Letters

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A method for reference strain measurement for FBG strain sensor in the testing stage while applying strain using actuators like piezo translators or micro screw is introduced.Unlike conventional methods of surface mounting, in our method the strain gauge is affixed directly to the optical fibre, which allows it to use with systems where the strain is applied directly using actuators while testing the FBG sensing system. Different bonding techniques were tested and a comparison with the results from calculated values are presented. Since the contact area between the fibre and strain gauge is very small a corrected gauge factor is calculated and is used to measure the strain transfer. As a demonstration of the developed method, the strain gauge is used as a reference in an edge filter based FBG sensors interrogation system, where the strain was applied using a micro screw. The measured strain using foil strain gauge affixed to the optical fibre and FBG sensor interrogation system are in close agreement.

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Section: Strain Measurement Using Fbg Strain Sensor Systemmentioning

confidence: 99%

A method to measure reference strain in FBG strain sensor interrogation system involving actuators

Rajan

Semenova

Wang

et al. 2007

Micro & Optical Tech Letters

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show abstract

“…All these techniques employed an optical spectrum analyzer (OSA) to extract either wavelength or bandwidth information, which significantly increases the cost of the system and limits scanning speed. As an alterative to an OSA, ratiometric wavelength measurement is a simple, high speed, and cost effective scheme [8,9]. Techniques for temperature compensating for ratiometric systems were also extensively investigated.…”

Section: Introductionmentioning

confidence: 99%

Use of a single-multiple-single-mode fiber filter for interrogating fiber Bragg grating strain sensors with dynamic temperature compensation

Wu¹,

Hatta²,

Semenova³

et al. 2009

Appl. Opt.

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An interrogation technique for fiber Bragg grating (FBG) strain sensors with dynamic temperature compensation using a single-multiple-single-mode (SMS) fiber filter as a temperature compensating element is presented. Experimental results show that this technique offers a resolution of better than 3:4 με for strain measurements in the range from 0 to 1667 με, and the temperature induced error is as low as 34 με in the temperature range from 10 to 60°C. The temperature induced error could be further reduced if the temperature sensitivity (the rate of temperature induced wavelength shift) of the SMS filter was closer to that of the FBG sensor. This can be achieved by selecting a multimode fiber for the SMS filter with appropriate parameters. The proposed technique can be modified for simultaneous measurements of strain and temperature with an experimentally achieved resolution of better than 1°C.

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“…In addition, improvements in the fabrication of FBGs using phase mask techniques [6] have reduced the cost of grating fabrication, and the interrogation unit, rather than the sensor accounts for a large proportion of the cost of a complete sensing system. Many techniques have been developed to interrogate FBGs based on different principles [7][8][9][10][11]. An interrogation system based on a macro-bending singlemode fiber edge filter [12] offers the advantages of an all-fiber approach with low cost together with large dynamic range and wide wavelength measurement range.…”

Section: Introductionmentioning

confidence: 99%

Analysis and performance evaluation of an all-fiber wide range interrogation system for a Bragg grating sensor array

Rajan¹,

Semenova²,

Farrell³

2009

J. Opt. A: Pure Appl. Opt.

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Abstract. Analysis and performance evaluation of a macro-bend fiber based interrogation system for a Bragg grating sensor array is presented. Due to the characteristic properties of the macro-bend fiber filter such as polarization and temperature dependence and the total noise associated with the ratiometric system, a best fit ratio slope is required to interrogate multiple FBGs whose peak wavelengths are spread over a wide wavelength range, rather than the optimal slope for individual FBG. In this paper for investigation we have used an FBG array with 5 FBGs with peak reflected wavelengths lying between 1525 nm and 1575 nm. The analysis of the system is carried out and a fiber filter with a slope which covers a wavelength range of 1525-1575 nm is selected which ensures a resolution and accuracy for all the FBG sensors in the array as close as possible to that which would be achieved with a filter with an optimal slope for each FBG. Performance evaluation of the system is carried out and static strain, dynamic strain and temperature is measured with the developed interrogation system.

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A passive wavelength demodulation system for guided-wave Bragg grating sensors

Cited by 286 publications

References 4 publications

A method to measure reference strain in FBG strain sensor interrogation system involving actuators

A method to measure reference strain in FBG strain sensor interrogation system involving actuators

Use of a single-multiple-single-mode fiber filter for interrogating fiber Bragg grating strain sensors with dynamic temperature compensation

Analysis and performance evaluation of an all-fiber wide range interrogation system for a Bragg grating sensor array

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