A fast response temperature sensor based on fiber Bragg grating

Zhang, Dengpan; Wang, Jin; Wang, Yongjie; Dai, Xiaoying

doi:10.1088/0957-0233/25/7/075105

Cited by 71 publications

(45 citation statements)

References 9 publications

(10 reference statements)

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“…Strain measurements performed with FBGs can achieve accuracy in the order of a single microstrain or lower. As regards thermal measurements, FBGs provide an almost instantaneous response due to their small thermal capacity [18][19][20][21]. Additionally, this technology is robust to harsh environment and totally insensitive to EM disturbances, since all the sensing and signal transmission is performed optically, and the materials employed in FBG manufacturing (mainly glass) are chemically inert.…”

Section: Fiber Bragg Grating Sensors: Operation and Applicationsmentioning

confidence: 99%

Experimental comparison of Fiber Bragg Grating installation techniques for aerospace systems

2019

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Aircraft systems are becoming more and more complex, as they are required to perform multiple functions. For example, smart systems need to be able to self-monitor their working parameters, in order to infer their health status. All these additional functions require the system to acquire a multitude of measurements; albeit sometimes it is possible to implement virtual sensor techniques, dedicate sensing hardware is usually needed. As a main drawback, the installation of the needed sensors adds up to the total complexity, weight, cost and failure rate of the system. In this context, minimally invasive sensors can be used to measure the system parameters with high spatial resolution and minimal added complexity. One key technology in this field is the Fiber Bragg Gratings (FBG) optical sensors, used to perform strain and temperature measurements. This work describes an experimental campaign intended to assess and validate several installation techniques for FBGs as strain sensors. Two test benches were developed for different measurement setups. One is intended for creep and repeatability tests of a FBG sensor glued at both ends; the other was used to compare point gluing and continuous gluing techniques on an aluminium beam subject to a bending load. Results are compared with numerical simulations of the structure and measurements performed with traditional strain gages.

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Section: Fiber Bragg Grating Sensors: Operation and Applicationsmentioning

confidence: 99%

Experimental comparison of Fiber Bragg Grating installation techniques for aerospace systems

2019

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“…Fiber-optic temperature sensors have been the focus of intensive research owning to their many advantages, such as small size, light weight, immunity to electromagnetic interference, harsh environment tolerance, remote sensing capability, and capability for distributed or quasi-distributed measurement. A number of sensor structures, including fiber Bragg gratings (FBGs) [1][2][3], long period gratings [4], and various forms of interferometers [5][6][7][8], have been developed and studied for temperature measurement with reduced cost, increased sensitivity, or enhanced temperature range.…”

Section: Introductionmentioning

confidence: 99%

“…Obviously, many of the reported all-silica-fiber-based temperature sensors possess relatively low sensitivity and relatively low temperature resolution. As to the response time, the package of a FBG with a copper tube encapsulation can greatly reduce the response time of the sensor from several seconds to 48.6 ms in water [2]. A response time of 16 ms in air was also demonstrated for a microfiber coupler tip temperature sensor [9].…”

Section: Introductionmentioning

confidence: 99%

High-resolution and fast-response fiber-optic temperature sensor using silicon Fabry-Pérot cavity

2015

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We report a fiber-optic sensor based on a silicon Fabry-Pérot cavity, fabricated by attaching a silicon pillar on the tip of a single-mode fiber, for high-resolution and high-speed temperature measurement. The large thermo-optic coefficient and thermal expansion coefficient of the silicon material give rise to an experimental sensitivity of 84.6 pm/°C. The excellent transparency and large refractive index of silicon over the infrared wavelength range result in a visibility of 33 dB for the reflection spectrum. A novel average wavelength tracking method has been proposed and demonstrated for sensor demodulation with improved signal-to-noise ratio, which leads to a temperature resolution of 6 × 10⁻⁴ °C. Due to the high thermal diffusivity of silicon, a response time as short as 0.51 ms for a sensor with an 80-µm-diameter and 200-µm-long silicon pillar has been experimentally achieved, suggesting a maximum frequency of ~2 kHz can be reached, to address the needs for highly dynamic environmental variations such as those found in the ocean.

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“…The importance of response time has been shown by several studies focused on the measurement of this parameter (see e.g. [5][6][7][8]). Research has also been carried out [9] that shows that selecting the appropriate sensor by its response time is crucial, in order to avoid significant instantaneous errors, especially in applications in which large gas temperature fluctuations occur on time scales shorter than the response time.…”

Section: Introductionmentioning

confidence: 99%

“…Other authors, such as Barrera et al [6] define it as the time required for the sensor to rise from 10% to 90% of the final temperature of the surrounding gas, and still others (e.g. [7,8]) as the time needed by the sensor to achieve 63.2% of the surrounding gas temperature variation. Some commercial thermocouple manufacturers provide information about the response time of their thermocouples.…”

Section: Introductionmentioning

confidence: 99%

Experimental and analytical evaluation of the response time of high temperature fiber optic sensors

Rinaudo

Payá-Zaforteza

Calderón

et al. 2016

Sensors and Actuators A: Physical

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Gas temperature is a key variable in many high temperature applications. Sensors for measuring gas temperatures must be selected according to many different criteria, response time being one of the most important. Response time quantifies the time that the sensor needs to react to a sudden temperature variation. When rapid temperature fluctuations are expected, as in the case of fire tests, significant instantaneous errors can occur if the sensor response time is longer than the duration of the temperature fluctuation. Despite the importance of response time, there is no general agreement on how to quantify this value in high temperature fiber optic sensors. This paper proposes a methodology to estimate the response time of fiber optic temperature sensors based on an analytical model of the heat transfer between the sensor and its surroundings. The method is validated by an experimental study. In addition, the response times of three different high temperature fiber optic sensors developed by the authors are compared with each other and with the response time of some widely used thermocouples. The results show i) that fiber optic sensors have a significantly shorter response time than thermocouples with similar packaging, ii) that the response time is shorter during the heating phase than the cooling phase, and iii) highlight the importance of considering this parameter in the sensor selection process.

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A fast response temperature sensor based on fiber Bragg grating

Cited by 71 publications

References 9 publications

Experimental comparison of Fiber Bragg Grating installation techniques for aerospace systems

Experimental comparison of Fiber Bragg Grating installation techniques for aerospace systems

High-resolution and fast-response fiber-optic temperature sensor using silicon Fabry-Pérot cavity

Experimental and analytical evaluation of the response time of high temperature fiber optic sensors

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