Simultaneous measurement of temperature and humidity based on FBG-FP cavity

Qi, Yuefeng; Jia, Cui; Tang, Li; Wang, Mingjun; Liu, Zimeng; Liu, Yanyan

doi:10.1016/j.optcom.2019.07.014

Cited by 24 publications

(5 citation statements)

References 10 publications

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“…Δn is the refractive index modulation depth, neff is the core effective reflective index, λ is the wavelength in air, Λ is the grating period and L is the grating length. According to Fresnel reflection formula, the reflectivity 𝑅2 of the fiber end face can be expressed as [6] :…”

Section: Sensing Mechanismmentioning

confidence: 99%

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Ultra-short fiber optic temperature sensor based on fiber Bragg grating Fabry-Perot interferometer

Luo,

Lin,

Guo

et al. 2023

AOPC 2023: Optic Fiber Gyro

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Fiber optic temperature sensors for small-scale heat sources have an urgent need in many industrial fields. We first propose and demonstrate an ultra-short fiber optic temperature sensor based on a Fabry-Perot (FP) interferometer which combines a fiber Bragg grating (FBG) with Fresnel reflection on the fiber end face. The FBG with a grating length of 50 µm was inscribed by a femtosecond laser line-by-line scanning technology. This FBG exhibits a resonant wavelength of 1548.8 nm and a broad full width at half maximum (FWHM) bandwidth of 12.4 nm. The selected dip wavelength of the FBG-FP cavity sensor changes linearly with the temperature increase, corresponding to the temperature sensitivity of 10.8 pm/°C. Moreover, the FBG-FP cavity sensor can be used to measure the temperature of the small-scale laser spot due to its compact structure. The experimental results show the temperature at different positions of laser exposure area are 138.4 °C, 111.5 °C and 74.4 °C, respectively.

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Section: Sensing Mechanismmentioning

confidence: 99%

“…( 2), the reflectivity R2 is calculated to be about 4% in case of n and n0 are 1.449 and 1, respectively. Hence, the reflectivity RFP of the FBG-FP cavity sensor is written as [6] :…”

Section: Sensing Mechanismmentioning

confidence: 99%

Ultra-short fiber optic temperature sensor based on fiber Bragg grating Fabry-Perot interferometer

Luo,

Lin,

Guo

et al. 2023

AOPC 2023: Optic Fiber Gyro

View full text Add to dashboard Cite

show abstract

“…However, the accuracy of the measurement made as a result will be significantly affected by the likely non-overlapping locations of the two sensors used, especially in the case of the dramatic changes that are seen in space applications, for example, in temperature and humidity measurement. The second scheme utilizes a sensor using a combination of wavelength and intensity demodulation methods [11]- [13]. While intensity demodulation-based sensors are usually inconvenient to use (in the need for sensor multiplexing) and to consider the disturbance of the light source as well as the environment on the result of the measurement, and thus an additional photodetector may be required to compensate for any optical power fluctuation that occurs in such a scheme.…”

Section: Introductionmentioning

confidence: 99%

Sensor for Simultaneous Measurement of Temperature and Humidity Based on a Chirped Fiber Bragg Grating Partially Bonded With Thick Polyimide Film

Guan,

Zhang,

Dong

et al. 2023

IEEE Sensors J.

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This paper presents a compact fiber-optic sensor based on a fiber Bragg grating (FBG), partially bonded with thick polyimide (PI) films, for the simultaneous measurement of humidity and temperature. Half of the grating was attached to the PI film, while the rest of the grating remained bare. When the sensor was exposed to humidity and temperature changes, a significant non-uniform stress distribution was introduced along the entire grating. The chirp effect occurs, which causes the main peak of the spectrum to split into different peaks. Depending on the wavelength shift of these different peaks, simultaneous measurement of temperature and humidity could be achieved by solving a matrix equation. This is the first time that such a thick PI film-based FBG sensor has been used for humidity and temperature monitoring. The benefit of the approach is that the sub-millimeter thickness of the PI film is at least one order of magnitude greater than that of the traditional PI coating used in such sensors. The proposed sensing structure with PI films enhances the sensor response to both humidity and temperature significantly. The humidity and temperature sensitivity are achieved as 13.70 pm/%RH and 19.12 pm/°C , respectively, in the experiment.

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“…Therefore, the RH sensing makes sense only if the temperature information is provided at the same time. In order to compensate temperature 2 > REPLACE THIS LINE WITH YOUR MANUSCRIPT ID NUMBER (DOUBLE-CLICK HERE TO EDIT) < cross sensitivity and detect temperature information, many hybrid structures have been proposed, such as FBG cascaded with FP cavity [19], FBG cascaded with up-tapered MZI [20], and FBG cascaded with tapered multi-mode fiber [21]. In order to adapt to the monitoring of a narrower environment, such as a microbial culture container, we have further compressed the size of the humidity sensor element.…”

Section: Introductionmentioning

confidence: 99%

Reflective SFT-FBG Hybrid Micro-Probe for Simultaneous Measurement of Relative Humidity and Temperature

Niu

Jiang

et al. 2022

IEEE Photonics J.

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An optical fiber probe composed of a fiber Bragg grating (FBG) and a reflective S fiber taper (SFT) with graphene oxide (GO) film, for simultaneous relative humidity (RH) and temperature measurement, was proposed and experimentally demonstrated in this paper. The SFT is made into reflection type by depositing silver mirror at the fiber end face, which is highly sensitive to surrounding refractive index (RI). The GO nanosheets, as a two-dimensional hydrophilic nano material, is coated on the fiber surface, acting as a RH-to-RI converter. The simultaneous RH and temperature measurements are realized by monitoring the characteristic wavelength shifts of the SFT and FBG in the reflection spectrum. Experimental results show that the RH sensitivity of the probe is 161.1 pm/%RH during the range of 30 %RH~90 %RH, and the temperature sensitivity is 14.1 pm/°C during the range of 10 ℃~50 ℃. The proposed probe is compact, flexible, and easy to be fabricated, which has potential application for precise localized measurement in medical and biochemical fields.

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Simultaneous measurement of temperature and humidity based on FBG-FP cavity

Cited by 24 publications

References 10 publications

Ultra-short fiber optic temperature sensor based on fiber Bragg grating Fabry-Perot interferometer

Ultra-short fiber optic temperature sensor based on fiber Bragg grating Fabry-Perot interferometer

Sensor for Simultaneous Measurement of Temperature and Humidity Based on a Chirped Fiber Bragg Grating Partially Bonded With Thick Polyimide Film

Reflective SFT-FBG Hybrid Micro-Probe for Simultaneous Measurement of Relative Humidity and Temperature

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