Fiber Bragg Grating Based Thermometry

Ahmed, Zeeshan; Filla, James; Guthrie, William F.; Quintavalle, John

doi:10.1080/19315775.2015.11721744

Cited by 24 publications

(27 citation statements)

References 22 publications

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“…The experimental measurement apparatus has been described in detail elsewhere 9 , 25 . Briefly, a C-band laser (New Focus TLB-6700 series1) is swept over the sensor resonance.…”

Section: Methodsmentioning

confidence: 99%

Assessing Radiation Hardness of Silicon Photonic Sensors

Ahmed

Cumberland

Klimov

et al. 2018

Sci Rep

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In recent years, silicon photonic platforms have undergone rapid maturation enabling not only optical communication but complex scientific experiments ranging from sensors applications to fundamental physics investigations. There is considerable interest in deploying photonics-based communication and science instruments in harsh environments such as outer space, where radiation damage is a significant concern. In this study, we have examined the impact of cobalt-60 γ-ray radiation up to 1 megagray (MGy) absorbed dose on silicon photonic devices. We do not find any systematic impact of radiation on passivated devices, indicating the durability of passivated silicon devices under harsh conditions.

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“…The experimental measurement apparatus has been described in detail elsewhere 9 , 25 . Briefly, a C-band laser (New Focus TLB-6700 series1) is swept over the sensor resonance.…”

Section: Methodsmentioning

confidence: 99%

Assessing Radiation Hardness of Silicon Photonic Sensors

Ahmed

Cumberland

Klimov

et al. 2018

Sci Rep

Self Cite

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“…[20] FBGs are currently being studied for a number of sensing applications, many focusing on either temperature or strain. [21] Heat changes, resulting from light absorption by a chromophore, are measured with a fiber Bragg grating [22] (Figure 1). As the pH changes, so do the light absorption (and heat generation) properties of the chromophores.…”

Section: Introductionmentioning

confidence: 99%

A photonic pH sensor based on photothermal spectroscopy

Hartings¹,

Castro²,

Gill³

et al. 2019

Sensors and Actuators B: Chemical

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Although the determination of pH is a standard laboratory measurement, new techniques capable of measuring pH are being developed to facilitate modern technological advances. Bio-industrial processing, tissue engineering, and intracellular environments impose unique measurement requirements on probes of pH. We describe a fiber optic-based platform, which measures the heat released by chromophores upon absorption of light. The optical fibers feature fiber Bragg gratings (FBG) whose Bragg peak redshifts with increasing temperature. Using anthocyanins (pH-sensitive chromophores found in many plants), we are able to correlate visible light absorption by a solution of anthocyanins to heat released and changes in FBG signal over a pH range of 2.5 to 10. We tested the ability of this platform to act as a sensor coating the fiber within a layer of crosslinked polyethylene glycol diacrylate (PEG-DA). Incorporating the anthocyanins into the PEG, we find that the signal magnitude increases over the observed signal at the same pH in solution. Our results indicate that this platform is viable for assessing pH in biological samples and point at ways to optimize performance.

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“…Photonic temperature sensors exploit temperature dependent changes in a material's propertiestypically, a combination of thermo-optic effect and thermal expansion [11,12]. For example, fiber Bragg gratings (FBG), exhibit temperature dependent shifts in resonant Bragg wavelength of  10 pm/K [8,13,14] which can be utilized to measure temperature over the range of 233 K to 293 K with uncertainties of 500 mK (k = 2) when humidity and strain effects are minimized [14]. The impact of humidity on silicon photonic devices' performance is significantly reduced by depositing a passivating silicon dioxide layer on top of the silicon device [10].…”

Section: Introductionmentioning

confidence: 99%

Towards replacing resistance thermometry with photonic thermometry

Klimov

Purdy

Ahmed

2018

Sensors and Actuators A: Physical

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Resistance thermometry provides a time-tested method for taking temperature measurements that has been painstakingly developed over the last century. However, fundamental limits to resistance-based approaches along with a desire to reduce the cost of sensor ownership and increase sensor stability has produced considerable interest in developing photonic temperature sensors. Here we demonstrate that silicon photonic crystal cavity-based thermometers can measure temperature with uncertainities of 175 mK ( = 1), where uncertainties are dominated by ageing effects originating from the hysteresis in the device packaging materials. Our results, a ≈ 4-fold improvement over recent developments, clearly demonstate the rapid progress of silicon photonic sensors in replacing legacy devices.

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Fiber Bragg Grating Based Thermometry

Cited by 24 publications

References 22 publications

Assessing Radiation Hardness of Silicon Photonic Sensors

Assessing Radiation Hardness of Silicon Photonic Sensors

A photonic pH sensor based on photothermal spectroscopy

Towards replacing resistance thermometry with photonic thermometry

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