Simultaneous measurement of strain (to 2000 /spl mu//spl epsiv/) and temperature (to 600/spl deg/C) using a combined Sb-Er-Ge-codoped fiber-fluorescence and grating-based technique

Pal, Saurabh; Shen, Yonghang; Mandal, Jharna; Sun, Tao; Grattan, K.T.V.

doi:10.1109/jsen.2005.859225

Cited by 20 publications

(6 citation statements)

References 13 publications

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“…PTICAL fiber sensors, which can measure strain and temperature simultaneously, have potential applications in many industrial processes such as structural health monitoring, various industrial fabrication processes and in other optical fiber sensors and various designs of such sensor systems have been intensively studied over recent years. Such methods for the simultaneous measurement of strain and temperature can be categorized as follows: i) two individual sensors with different sensitivities to strain and temperature, such as two fiber Bragg grating (FBG) with different grating periods [1], different types of fiber structure [2], using emission lines [3], long period gratings [4] or fluorescent fiber techniques [5]; ii) one single sensor with two or more outputs which show different responses to strain and temperature (such as the peak or dip wavelengths formed by interference between two different orders of core/cladding modes with the fundamental mode in one compact fiber interferometer) constructed by splicing a suspended core photonic crystal fiber [6], a liquid-filled photonic crystal fiber [7], or a fiber taper and lateral-shifted junction [8] with normal single mode fiber (SMF). In some of these designs, the use of two sensors located at different positions can cause errors in the measurement of one or the other measurand (as they are not co-located).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Measurement of Strain and Temperature With a Few-Mode Fiber-Based Sensor

Dong

et al. 2018

J. Lightwave Technol.

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This paper proposes a novel detection scheme simultaneously to measure strain and temperature, based on a simple to construct device using a section of a specially designed few mode fiber (FMF). The parameters and index profile of the FMF used as the key sensor element are such that the fiber supports only the LP01 and LP02 modes. The propagation constant difference between LP01 and LP02 modes, Δβ, has a maximum corresponding to the critical wavelength (CWL) in the fiber transmission spectrum. Because the two peaks located closest to the CWL from both sides, Left Peak 1 and Right Peak 1, shift in opposite directions, with different sensitivities under axial strain and temperature variations, the FMF device is capable of measuring the strain and temperature simultaneously. A theoretical analysis has been carried out as part of the design process and the experimental results obtained are found to agree well with the theoretical predictions. The characteristics of this sensor scheme is discussed in light of other competing approaches to simultaneous temperature and strain monitoring and is found to show advantages which suit several practical applications including compactness, ease of fabrication and implementation, relatively high sensitivities and low cost.

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Section: Introductionmentioning

confidence: 99%

Simultaneous Measurement of Strain and Temperature With a Few-Mode Fiber-Based Sensor

Dong

et al. 2018

J. Lightwave Technol.

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“…However, conventional type-I FBGs exhibiting a strong decay at high temperatures can only operate in principle up to 300 °C for lengthy periods [5]. Many of research efforts have been expended towards the investigation of thermally stable gratings at high temperatures, including formation of type-I n (type-IIA) gratings [6,7] and type-II gratings [8], writing by femtosecond lasers [9], formation of surface relief FBGs [10], and tailoring of glass composition [11,12,13]. In the past decade, another variant, regenerated fiber Bragg gratings (RFBGs), with superior high-temperature stability has been found and considered as the essential potential for high-temperature applications [14,15].…”

Section: Introductionmentioning

confidence: 99%

An Improved Metal-Packaged Strain Sensor Based on A Regenerated Fiber Bragg Grating in Hydrogen-Loaded Boron–Germanium Co-Doped Photosensitive Fiber for High-Temperature Applications

Zhou

et al. 2017

Sensors

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Local strain measurements are considered as an effective method for structural health monitoring of high-temperature components, which require accurate, reliable and durable sensors. To develop strain sensors that can be used in higher temperature environments, an improved metal-packaged strain sensor based on a regenerated fiber Bragg grating (RFBG) fabricated in hydrogen (H2)-loaded boron–germanium (B–Ge) co-doped photosensitive fiber is developed using the process of combining magnetron sputtering and electroplating, addressing the limitation of mechanical strength degradation of silica optical fibers after annealing at a high temperature for regeneration. The regeneration characteristics of the RFBGs and the strain characteristics of the sensor are evaluated. Numerical simulation of the sensor is conducted using a three-dimensional finite element model. Anomalous decay behavior of two regeneration regimes is observed for the FBGs written in H2-loaded B–Ge co-doped fiber. The strain sensor exhibits good linearity, stability and repeatability when exposed to constant high temperatures of up to 540 °C. A satisfactory agreement is obtained between the experimental and numerical results in strain sensitivity. The results demonstrate that the improved metal-packaged strain sensors based on RFBGs in H2-loaded B–Ge co-doped fiber provide great potential for high-temperature applications by addressing the issues of mechanical integrity and packaging.

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“…Fluorescence detection is one of the most widely used techniques for living cell/tissue imaging and antigen/antibody identification in bioresearch and medical diagnosis, − determination of specified ions or gas in environmental monitoring, − and even strain/ temperature measurement . A typical fluorescence sensor system mainly consists of an excitation light source, one or more filters, a photo-detector (PD), and fluorescent samples. , When the excitation light illuminates the fluorescent samples, the intensity or phase of the fluorescent light indicates the physical parameters of the target .…”

Section: Introductionmentioning

confidence: 99%

Compact Fluorescence Detection System Based on a Monolithic DBR-Integrated III-Nitride LED Chip

Yan

Shi

et al. 2023

ACS Omega

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Portable applications of fluorescence detection systems have gained much attention in various fields and require system components to be small and compact. In this work, we report on a compact fluorescence detection system and demonstrate its application for fluorescence sensing and imaging. The light source and filter are integrated on a single chip for the proposed system, which not only realizes the separation between excitation and fluorescent lights but also improves the light-emitting diode (LED) light extraction efficiency. Furthermore, the detection system allows for a removable sample unit. The results indicate that the performance of the distributed Bragg reflector (DBR) filter based on an amorphous dielectric film is excellent with selection ratios larger than 4600:1. The peak emission wavelength of the LED is 528 nm. The influence of green light leakage can be neglected, and the fluorescent red light is dominant when the fluorescence detection system is used for sensing and imaging. The low-cost and monolithic DBR-integrated III-nitride LED chip makes the proposed architecture a competitive candidate for portable fluorescence detection applications.

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Simultaneous measurement of strain (to 2000 /spl mu//spl epsiv/) and temperature (to 600/spl deg/C) using a combined Sb-Er-Ge-codoped fiber-fluorescence and grating-based technique

Cited by 20 publications

References 13 publications

Simultaneous Measurement of Strain and Temperature With a Few-Mode Fiber-Based Sensor

Simultaneous Measurement of Strain and Temperature With a Few-Mode Fiber-Based Sensor

An Improved Metal-Packaged Strain Sensor Based on A Regenerated Fiber Bragg Grating in Hydrogen-Loaded Boron–Germanium Co-Doped Photosensitive Fiber for High-Temperature Applications

Compact Fluorescence Detection System Based on a Monolithic DBR-Integrated III-Nitride LED Chip

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