Enhancing sensing sensitivity for long period grating sensor with colloidal gold nanoparticles

Tang, Jaw-Luen; Jui, Ping-Chang; Wang, Jian-Neng

doi:10.1117/12.689046

Cited by 2 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The LPFG couples light from a guided fundamental core mode LP 01 to different forward-propagating cladding modes HE 1m in an optical fiber, which is given by phase-matching condition 9 The fabrication and techniques of LPFGs have been reported [10][11][12][13] . The experimental apparatus consisted of a computercontrolled CO 2 laser associated with a high-speed optical beam scanner, a translation stage, a broadband amplified spontaneous emission (ASE) fiber source and a high-resolution spectrum analyzer (ANDO AQ6315A) used to in-situ monitor the transmission loss as the grating was written.…”

Section: Characterization Of Long Period Grating Sensormentioning

confidence: 99%

“…The LPFG sensor was extremely sensitive to the refractive index of the medium surrounding the cladding surface of the sensing grating, thus allowing it to be used as an ambient index sensor or chemical concentration indicator [10][11][12][13] . We have measured chloride ion levels in a concrete sample immersed in salt water solution with different weight concentration ranging from 0 % to 20 %, and results showed that the LPFG sensor exhibited a linear decrease in the transmission loss and resonance wavelength shift when the concentration increased 10 .…”

Section: Characterization Of Long Period Grating Sensormentioning

confidence: 99%

See 1 more Smart Citation

Development of viscosity sensor with long period fiber grating technology

et al. 2009

Self Cite

View full text Add to dashboard Cite

In this paper, we describe the development of a viscosity sensing system using a simple and low-cost long-period fiber grating (LPFG) sensor. The LPFG sensor was extremely sensitive to the refractive index of the medium surrounding the cladding surface of the sensing grating, thus allowing it to be used as an ambient index sensor or chemical concentration indicator. Viscosity can be simply defined as resistance to flow of a liquid. We have measured asphalt binder, 100-190000 centistokes, in comparison with optical sensing results. The system sensing asphalt binders exhibited increase trend in the resonance wavelength shift when the refractive index of the medium changed. The prototype sensor consisted of a LPFG sensing component and a cone-shaped reservoir where gravitational force can cause asphalt binders flow through the capillary. Thus the measured time for a constant volume of asphalt binders can be converted into either absolute or kinematic viscosity. In addition, a rotational viscometer and a dynamic shear rheometer were also used to evaluate the viscosity of this liquid, the ratio between the applied shear stress and rate of shear, as well as the viscoelastic property including complex shear modulus and phase angle. The measured time could be converted into viscosity of asphalt binder based on calculation. This simple LPFG viscosity sensing system is hopefully expected to benefit the viscosity measurement for the field of civil, mechanical and aerospace engineering.

show abstract

Section: Characterization Of Long Period Grating Sensormentioning

confidence: 99%

Section: Characterization Of Long Period Grating Sensormentioning

confidence: 99%

Development of viscosity sensor with long period fiber grating technology

et al. 2009

Self Cite

View full text Add to dashboard Cite

show abstract

“…An LPG is a photo-induced periodic modulation of refractive index along the core of a singlemode fiber, with a typical perturbation of 4 10 − ∆n , periods between 100 µm -1 mm and length of 2-4 cm. The LPG couples light from a guided fundamental core mode LP 01 to different forward-propagating cladding modes HE 1m in an optical fiber, which is given by phase-matching condition 19 The fabrication and techniques of LPGs have been reported [20][21][22][23] . The experimental apparatus consisted of a computercontrolled CO 2 laser associated with a high-speed optical beam scanner, a translation stage, a broadband amplified spontaneous emission (ASE) fiber source and a high-resolution spectrum analyzer (ANDO AQ6315A) used to in-situ monitor the transmission loss as the grating was written.…”

Section: Characterization Of Long Period Grating Sensormentioning

confidence: 99%

“…The LPG sensor was extremely sensitive to the refractive index of the medium surrounding the cladding surface of the sensing grating, thus allowing it to be used as an ambient index sensor or chemical concentration indicator [20][21][22][23] . We have measured chloride ion levels in a concrete sample immersed in salt water solution with different weight concentration ranging from 0 % to 20 %, and results showed that the LPG sensor exhibited a linear decrease in the transmission loss and resonance wavelength shift when the concentration increased 20 .…”

Section: Characterization Of Long Period Grating Sensormentioning

confidence: 99%

Optical fiber grating-based sensing system for use in pavement health monitoring

Wang

Tang

2008

SPIE Proceedings

Self Cite

View full text Add to dashboard Cite

In this paper, we describe the development and realization of a sensing system using a high-resolution temperature and strain sensor with fiber Bragg grating (FBG) technology and a simple and low-cost long-period grating (LPG) sensor for the water level measurement in pavement structures. The FBG sensor consists of a reference fiber grating and a grating pair scheme that could offer the potential of simultaneous measurement of strain and temperature for monitoring pavement structures. For FBG sensor, experimental results have shown that measurement errors of 6 micro strains and 0.13 Celsius for strain and temperature could be achieved, respectively. The LPG sensor was extremely sensitive to the refractive index of the medium surrounding the cladding surface of the sensing grating, thus allowing it to be used as an ambient index sensor. A LPG-type water level sensor with a resolution was of ~5 mm was demonstrated to distinguish between in the air and under water. This integrated FBG and LPG sensing system is expected to benefit the health monitoring of multi-layer pavement structures especially for the evaluation and application of new materials, mix design procedures or construction technology.

show abstract

Enhancing sensing sensitivity for long period grating sensor with colloidal gold nanoparticles

Cited by 2 publications

References 0 publications

Development of viscosity sensor with long period fiber grating technology

Development of viscosity sensor with long period fiber grating technology

Optical fiber grating-based sensing system for use in pavement health monitoring

Contact Info

Product

Resources

About