研究目的
To develop and analyze a NiTi-integrated optical fiber sensor, focusing on its life cycle behavior, morphological, structural, and thermal properties, and its application in microelectromechanical systems.
研究成果
The NiTi-coated optical fiber developed through flash evaporation showed cyclic periodicity, with a monoclinic structure in the martensite phase, rhombohedral structure in the R phase, and cubic structure in the austenite phase. The sensor can sense temperature from 70°C to 130°C, with a maximum displacement of 2.25 mm and a sensitivity of 0.01 mV/°C. The developed SMA-coated optic fiber can actuate in force of more than 1 mN and showed better light transmittance at higher temperature ranges than bare optic fiber.
研究不足
Higher manufacturing cost than conventional metallic coatings, lack of trained expertise in SMA technology, and reduced optical transmittance due to flash evaporation coating.
1：Experimental Design and Method Selection:
Flash evaporation deposition method was used for developing NiTi thin film on plastic optical fiber (POF) under high vacuum conditions.
2：Sample Selection and Data Sources:
Wires of nickel and titanium (50% Ni and 50% Ti) were used for deposition. POF with specific dimensions was pre-strained 5% using mechanical loading.
3：List of Experimental Equipment and Materials:
Differential scanning calorimetry (DSC), scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and an electrical actuation setup including a laser displacement sensor, data acquisition system, Arduino-relay circuit, thermo-optical sensor, and a programmable power supply.
4：Experimental Procedures and Operational Workflow:
The NiTi-coated fiber was characterized for its morphological, structural, and thermal properties. Electrical actuation tests were conducted using Joule heating with varying loads and voltages.
5：Data Analysis Methods:
The data from DSC, SEM, XRD, and TGA were analyzed to understand the properties and performance of the NiTi-coated optical fiber.
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differential scanning calorimetry
Measuring the disparities in heat capacity using the variation in heat flow.
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scanning electron microscopy
Examining the morphology of the developed coating.
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X-ray diffraction
Characterizing the structural properties of the samples.
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thermogravimetric analysis
Analyzing the thermal characteristics of the samples.
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laser displacement sensor
Measuring displacement during electrical actuation tests.
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data acquisition system
Recording data during experiments.
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Arduino-relay circuit
Arduino
Acting as a switch which alternates between heating and cooling of the SMA embedded in the optical fiber.
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thermo-optical sensor
Measuring the light intensity in terms of equivalent current at the output side.
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programmable power supply
Supplying power during electrical actuation tests.
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Flir One thermal camera
Flir
Recording thermal images during the life cycle test.
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