Discrimination between strain and temperature effects using dual-wavelength fibre grating sensors

Xu, Ming; Archambault, J.L.; Reekie, L.; Dakin, J.P.

doi:10.1049/el:19940746

Cited by 477 publications

(252 citation statements)

References 2 publications

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“…The condition number is calculated based on maximum errors in a measurement system [24] and for this reason the results of Table 1(b) shows some agreement between this number and the maximum/cumulative errors. The errors of ±1 o C and ±11  obtained from the TFBG sensor reported in this paper are comparable to errors of ±1 o C and ±12  calculated for a 2 co-located FBG sensor system [3] (2 different wavelengths). However, the difference between the condition numbers of the two systems, 39.4 and 129.5 respectively, is significant.…”

supporting

confidence: 70%

“…This paper Single TFBG [3] 2 Co-located FBGs [4] 2 FBGs in fibres of different dopants [5] 2 In summary, a new approach to discriminating between the temperature and strain responses of FBG sensors has been demonstrated. The technique requires the use of a single FBG, tracking features that lie within the same spectral range, and does not require special processing or packaging of the fibre.…”

Section: Reference Number Sensor Systemmentioning

confidence: 99%

“…Appropriate packaging can ensure that one of the sensors is shielded from one of the measurands [2]. FBGs with inherently different sensitivities may be used, for example, FBGs with different centre wavelengths [3], FBGs written in fibres of different composition [4] or with different diameters [5], or FBGs fabricated under different conditions [6,7]. Alternatively, the measurement from an FBG may be combined with that of a different sensing technique, for example, measuring the fluorescence lifetime of ions in doped optical fibre [8] or stimulated Brillouin scattering [9].…”

mentioning

confidence: 99%

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Temperature and strain discrimination using a single tilted fibre Bragg grating

Chehura

James

Tatam

2007

Optics Communications

120

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A fibre optic sensor capable of discriminating between temperature and strain, using a single fibre Bragg grating, is presented. The technique exploits the core-cladding mode coupling of a tilted fibre Bragg grating (TFBG). The core and cladding modes exhibit different thermal sensivities, while the strain sensivities are approximately equal. Monitoring the core-core mode coupling resonance and the core-cladding mode coupling resonance of the TFBG spectrum allows the separation of the temperature and strain induced wavelength shifts.

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supporting

confidence: 70%

Section: Reference Number Sensor Systemmentioning

confidence: 99%

mentioning

confidence: 99%

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Temperature and strain discrimination using a single tilted fibre Bragg grating

Chehura

James

Tatam

2007

Optics Communications

120

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“…A lot of techniques have been reported to overcome this problem. One of them consists in the use of two superimposed FBG [10] or only long period gratings (superimposed or not) [11]. In all of those sorts of designs the small differences in sensitivities are a limitation to discriminate strain-temperature effects.…”

Section: Introductionmentioning

confidence: 99%

Liquid Resin Infusion process monitoring with embedded superimposed long period and short period Bragg grating sensor.

Triollet

Robert

Marin

et al. 2010

EPJ Web of Conferences

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Abstract. We propose here the monitoring of the Liquid Resin Infusion (LRI) process for using a superimposed long period (LPG) and short period (FBG) Bragg grating sensor. Monitoring of such a process is usually made measuring simultaneously temperature and strain by the use of an electro-optical device (FBG-Thermocouple). It has been shown that an applied solicitation is measured by a wavelength shift with a different sensitivity for LPG and FBG; thus strain and temperature influences can be determined separately by measuring corresponding wavelength shifts. The reported configuration is based on the use of these two Bragg gratings types written in the same fibre section, which allows us to discriminate the contributions of the temperature and strain. The sensor is embedded in a composite specimen manufactured by LRI process for monitoring in real time and simultaneously the applied temperature and strain.

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“…Many techniques to discriminate the effects between strain and temperature in fiber Bragg grating (FBG) sensors have been reported, which include schemes using a tilted fiber Bragg grating demodulator (Kang and Kim 1998), superimposed gratings (Xu et al 1994), a chirped Bragg grating (Xu et al 1995) and a long period grating (Bhatia et al 1997), etc. Among existing schemes, a dual head sensor is one of the most effective schemes due to its compact size and good performance (James et al 1996;Song et al 1997).…”

Section: Introductionmentioning

confidence: 99%

A Simple Passive Arc-Shape Temperature-Independent Load Sensor Using a Pair of Fiber Bragg Gratings

Hao¹,

Cai²,

Gong³

et al. 2008

International Journal of Optomechatronics

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In this paper, a novel arc-shape FBG (Fiber Bragg Grating) load sensor is developed with a pair of FBGs embedded symmetrically in an elastic bending beam. The FBG pair is produced with peak wavelength separation of about 0.4 nm. The FBG with shorter wavelength is located above the neutral layer and another with longer wavelength below the neutral layer. As a result, the two peak wavelengths of the FBG pair move apart with lateral force applied but move together in the same direction when surrounding temperature varies, both in a linear manner. A very low temperature-dependency of only 0.04 pm/ C across the temperature range from 35 C to 82 C has been achieved, which makes it suitable for dynamic lateral force measurement even when the environmental temperature varies. Due to the fact that the sensor module consists of only the grating fiber with two FBGs and some elastic material, which are purely passive components, hence, the temperature effect of this sensor can be self-compensated without a need of any active temperature controller or other temperature-isolation mechanism, thus in principle, this sensor module is passively temperature-independent.

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Discrimination between strain and temperature effects using dual-wavelength fibre grating sensors

Cited by 477 publications

References 2 publications

Temperature and strain discrimination using a single tilted fibre Bragg grating

Temperature and strain discrimination using a single tilted fibre Bragg grating

Liquid Resin Infusion process monitoring with embedded superimposed long period and short period Bragg grating sensor.

A Simple Passive Arc-Shape Temperature-Independent Load Sensor Using a Pair of Fiber Bragg Gratings

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