Electronic technique for temperature compensation of fibre Bragg gratings sensors

Dias, José Antonio Siqueira; Leite, R.L.; Ferreira, Elnatan Chagas

doi:10.1016/j.aeue.2007.01.008

Cited by 17 publications

(7 citation statements)

References 9 publications

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“…It shows that the changes in

and

will cause the center wavelength shift of the reflection spectrum. Since photoelastic and thermoelastic tensors in optical fibers are not null, the temperature causes the thermal expansion effect, thermo-optical effect, and internal thermal stress of the fiber [ 15 , 16 , 17 ], meanwhile, the stress and strain cause the elastic deformation and elastic–optical effect of the optical fiber [ 18 ]. Therefore, both temperature variations and mechanical strain variations affect the refractive index and grating period, which ultimately affect the central wavelength of reflection spectrum.…”

Section: Structure and Principlementioning

confidence: 99%

Analytical Evaluation and Experiment of the Dynamic Characteristics of Double-Thimble-Type Fiber Bragg Grating Temperature Sensors

et al. 2020

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A double-thimble-type fiber Bragg grating (FBG) temperature sensor that isolates the stress strain is developed, and the three materials of air, grease, and copper thimble are employed for encapsulating. To investigate the effect of different encapsulation materials on the time constant of the sensors under dynamic conditions, the transient heat conduction mathematical model is built according to the lumped heat capacity (LHC) system and thermal equilibrium theory, and the time constant is solved by an analytical solution. Then, a proportional three-dimensional sensor simulation model is established and the transient heat transfer process is numerically solved by the finite element analysis method. To verify the models, an experimental system is established to test the response speed of the three-type sensor and the experimental data are compared with the analytical and numerical solution results. The results show that the dynamic response performance depends on the encapsulation material parameters; the response speed is faster than recovery speed; and the response speed of the air packaging sensor is more than 20% faster than that of the grease packaging sensor, and more than 30% faster than that of the copper packaging sensor. The smaller the heat storage capacity and the larger the heat transfer coefficient, the faster the sensor’s response speed.

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“…It shows that the changes in

and

Section: Structure and Principlementioning

confidence: 99%

Analytical Evaluation and Experiment of the Dynamic Characteristics of Double-Thimble-Type Fiber Bragg Grating Temperature Sensors

et al. 2020

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“…Many commercial FBG interrogators record the measured data in an external computer in csv or text files. When a single data reading must be taken for control of each cylinder, the receiver of the optical sensing system could use, for example, the optical-edge-filtering technique [23] to detect the dynamic pressure. However, the FBG center wavelength shift due to temperature variation in the combustion chamber depends on the engine load [24].…”

Section: Introductionmentioning

confidence: 99%

Demonstration of a Filterless, Multi-Point, and Temperature-Independent Fiber Bragg Grating Dynamical Demodulator Using Pulse-Width Modulation

Rosolem

Argentato

Bassan

et al. 2020

Sensors

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We demonstrated in this work a filterless, multi-point and temperature-independent FBG (fiber Bragg grating) dynamical demodulator using pulse-width-modulation (PWM). In this approach, the FBG interrogation system is composed of a tunable laser and a demodulator that is designed to detect the wavelength shift of the FBG sensor without any optical filter making it very suitable to be used in harsh environments. In this work, we applied the proposed method that uses the PWM technique for FBG sensors placed in high pressure and high-temperature environments. The proposed method was characterized in the laboratory using an FBG sensor modulated in a frequency of 6 Hz, with a 1 kHz sweeping frequency in the wavelength range from 1527 to 1534 nm. Also, the method was evaluated in a field test in an engine of a thermoelectric power plant.

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“…(3) temperature compensation based on software (Du Yong-ping and He Xiao-ying, 2009; J.A. Siqueira Dias et al, 2008). In theory it can be compensated completely by using parallel temperature compensation, but in practical it is only proximate compensation; zero point temperature compensation have high accuracy, but it is difficult to find the material; it is a simple, effective method to take temperature compensation by using software, and an approach to increase the accuracy of sensor measurement (Xu Jun, 2002;Matej Možek et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

A Simple Temperature Compensation Method for Turbidity Sensor

Tai

Wei

et al. 2011

Computer and Computing Technologies in Agriculture IV

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Turbidity sensor for water treatment applications are based on scattered light measurement. The electrooptical characteristic of light emitter and detector has a close relationship with the environmental temperature. Fluctuations in water temperature can potentially affect electronic components and cause output signal errors in turbidity sensor. Decrease or eliminate temperature error is necessary. With this background we have taken the temperature experiment of turbidity sensor developed by us. 11 different concentrations were measured, ranging from 0 to 100NTU. Each solution was cooled to 1℃, and then gradually heated to 40℃. The output signal of sensor increased according to the rise of temperature found from the experiment. In order to compensate the temperature errors, we developed a novel method to take temperature compensation by using software. The method carried by MCU which is used to compensate the measurement errors by soft programming is simple and effective; it can improve the error compensation precision on sensors greatly.

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Electronic technique for temperature compensation of fibre Bragg gratings sensors

Cited by 17 publications

References 9 publications

Analytical Evaluation and Experiment of the Dynamic Characteristics of Double-Thimble-Type Fiber Bragg Grating Temperature Sensors

Analytical Evaluation and Experiment of the Dynamic Characteristics of Double-Thimble-Type Fiber Bragg Grating Temperature Sensors

Demonstration of a Filterless, Multi-Point, and Temperature-Independent Fiber Bragg Grating Dynamical Demodulator Using Pulse-Width Modulation

A Simple Temperature Compensation Method for Turbidity Sensor

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