Chalcogenide Glass-Capped Fiber-Optic Sensor for Real-Time Temperature Monitoring in Extreme Environments

Badamchi, Bahareh; Simon, Al-Amin Ahmed; Mitkova, M.; Subbaraman, Harish

doi:10.3390/s21051616

Cited by 8 publications

(3 citation statements)

References 44 publications

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“…Structural colors, generated by the interaction of incident light and periodic nanostructures, have attracted intense interest recently in a wide range of research fields, such as sensors, − optical encryption, , displays, − etc. However, the structural-colored materials have been limited to thin films or bulk materials, and only a few fibers have been reported. − …”

Section: Introductionmentioning

confidence: 99%

Thermoresponsive Structural Coloration of Hydrogel Fibers

Zhu,

Meng,

Zhou

et al. 2024

ACS Appl. Polym. Mater.

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Intelligent fibers with a structural color have wide applications in many cutting-edge fields and have attracted significant attention in recent years. However, most reported optical fibers have a fixed structural color because hard colloids were used as blocks of photonic crystals. Herein, we developed a simple and scalable method to realize hydrogel fibers with a dynamic structural color using soft and thermoresponsive microgels as photonic blocks. A full interpenetrated sodium alginatepolyacrylamide hydrogel fiber was prepared through an exclusion process, which is facile for scaled-up and continuous preparation of hydrogel fibers by controlling the injection speed. Amino groupdoped poly(N-Isopropylacrylamide) microgels were attached to the surface of hydrogel fibers by the Schiff-base bonds and resulted in amorphous arrays, exhibiting angle-independent colors. Under temperature stimuli, the tunable structural color could be easily displayed through the shrinkage of the microgels. Moreover, the soft microgels could also be attached to the commercial wood fabrics easily, endowing the fabrics with thermochromic properties. Besides temperature, the microgels are also sensitive to humidity and ionic strength; therefore, the fabrics can simultaneously provide measurements of humidity and sweat amount for wireless monitoring. This versatile tunable structural color coating approach shows great potential for smart fibers and clothing fabrics and tracking for changes in environmental factors.

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Section: Introductionmentioning

confidence: 99%

Thermoresponsive Structural Coloration of Hydrogel Fibers

Zhu,

Meng,

Zhou

et al. 2024

ACS Appl. Polym. Mater.

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“…Moreover, very few other sensors are constantly used in the engine hot section due to the high cost and the lack of materials and technologies to ensure durability. The exceptions include various types of thermometers, such as optical fibers [24,25], Pt100 sensors, and thermocouples, which are usually duplicated. Piezoelectric transducers, such as pressure [26,27] and vibration transducers [28], have a similar problem with the Curie temperature as in inductive sensors, but there is a group of materials that does work above 600°C [29,30].…”

Section: Introductionmentioning

confidence: 99%

High Temperature Magnetic Sensors for the Hot Section of Aeroengines

et al. 2021

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Magnetic sensors are widely used in aeroengines and their health management systems, but they are rarely installed in the engine hot section due to the loss of magnetic properties by permanent magnets with increasing temperature. The paper presents and verifies models and design solutions aimed at improving the performance of an inductive sensor for measuring the motion of blades operated at elevated temperatures (200–1000 °C) in high pressure compressors and turbines. The interaction of blades with the sensor was studied. A prototype of the sensor was made, and its tests were carried out on the RK-4 rotor rig for the speed of 7000 rpm, in which the temperature of the sensor head was gradually increased to 1100 °C. The sensor signal level was compared to that of an identical sensor operating at room temperature. The heated sensor works continuously producing the output signal whose level does not change significantly. Moreover, a set of six probes passed an initial engine test in an SO-3 turbojet. It was confirmed that the proposed design of the inductive sensor is suitable for blade health monitoring (BHM) of the last stages of compressors and gas turbines operating below 1000 °C, even without a dedicated cooling system. In real-engine applications, sensor performance will depend on how the sensor is installed and the available heat dissipation capability. The presented technology extends the operating temperature of permanent magnets and is not specific for blade vibration but can be adapted to other magnetic measurements in the hot section of the aircraft engine.

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“…Moreover, very few other sensors are constantly used in the engine hot section due to the high cost and the lack of materials and technologies to ensure durability. The exceptions include various types of thermometers such as optical fibres [22,23], Pt100 sensors and thermocouples, which are usually duplicated. Piezoelectric transducers such as pressure [24,25] and vibration transducers [26] have a similar problem with the Curie temperature as in inductive sensors, but there is a group of materials that work above 600°C [27,28].…”

Section: Introductionmentioning

confidence: 99%

High Temperature Magnetic Sensors

Rokicki¹,

Przysowa²,

Kotkowski³

et al. 2021

Preprint

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Magnetic sensors are widely used in health management systems for turbomachinery, but their applications in the hot zone are limited due to the loss of magnetic properties by permanent magnets with increasing temperature. The paper presents and verifies models and design solutions aimed at improving the performance of an inductive sensor for measuring the motion of rotating objects operating at elevated temperatures (200-1000C), such as compressor and turbine blades. Physical, analog and mathematical models of the interaction of blades with the sensor were developed. A prototype of the sensor was made and its tests were carried out on the RK-4 rotor rig for the speed of 7000 rpm, in which the temperature of the sensor head was gradually increased to 1100C. The sensor signal level was compared to that of an identical sensor operating at room temperature. The heated sensor works continuously producing the output signal whose level does not change significantly. What is more, a set of six probes passed an initial engine test in an SO-3 turbojet. It was confirmed that the proposed design of the inductive sensor is suitable for blade health monitoring of the last stages of compressors, steam turbines as well as previous generation gas turbines operating below 1000C, even without a dedicated cooling system. In real-engine applications, sensor performance will depend on how the sensor is installed and the available heat dissipation capability

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Chalcogenide Glass-Capped Fiber-Optic Sensor for Real-Time Temperature Monitoring in Extreme Environments

Cited by 8 publications

References 44 publications

Thermoresponsive Structural Coloration of Hydrogel Fibers

Thermoresponsive Structural Coloration of Hydrogel Fibers

High Temperature Magnetic Sensors for the Hot Section of Aeroengines

High Temperature Magnetic Sensors

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