In recently years, environmental problems, such as global warming and exhaustion of fossil fuels, have grown into serious problems. In the automakers, the development of the fuel cell vehicles using hydrogen as clean ...In recently years, environmental problems, such as global warming and exhaustion of fossil fuels, have grown into serious problems. In the automakers, the development of the fuel cell vehicles using hydrogen as clean energy has been paid attention to. Aluminum alloys have already been applied to a liner material of a high-pressure hydrogen tank for fuel cell vehicles. However, the behavior of hydrogen in aluminum alloys has not been clearly elucidated yet. Therefore, it is necessary to analyze the hydrogen behavior in aluminum alloys. Hydrogen microprint technique （HMPT） has been known as an effective measure to investigate the hydrogen behavior. In the present study, the emission behavior of internal hydrogen on a tensile-deformed Al-9%Mg alloy was investigated bv HMPT at room temoerature. As a result, the hydrogen was emitted at some grain boundaries.展开更多
Accelerometers are crucial sensors that measure acceleration resulting from motion or vibration.Compared with their electromechanical counterparts,optical accelerometers are widely regarded as the most promising techn...Accelerometers are crucial sensors that measure acceleration resulting from motion or vibration.Compared with their electromechanical counterparts,optical accelerometers are widely regarded as the most promising technology for high-requirement applications.However,compact integration of various optical and mechanical components to create a miniature optomechanical microsystem for acceleration sensing remains a challenge.In this study,we present a miniature optical fiber accelerometer based on a 3D microprinted ferrule-top Fabry–Pérot(FP)microinterferometer.In-situ 3D microprinting technology was developed to directly print a sub-millimeter-scale 3D proof mass/thin-film reflector-integrated FP microinterferometer on the inherently light-coupled end face of a fiber optic ferrule.Experimental results demonstrate that the optical fiber accelerometer has a flat response over a bandwidth of 2 to 3 kHz and its noise equivalent acceleration is 62.45μg/Hz under 1-g acceleration at 2 kHz.This ultracompact optical fiber interferometric accelerometer offers several distinct advantages,including immunity to electromagnetic interference,remote-sensing capability,and high customizability,making it highly promising for a variety of stringent acceleration-monitoring applications.展开更多
文摘In recently years, environmental problems, such as global warming and exhaustion of fossil fuels, have grown into serious problems. In the automakers, the development of the fuel cell vehicles using hydrogen as clean energy has been paid attention to. Aluminum alloys have already been applied to a liner material of a high-pressure hydrogen tank for fuel cell vehicles. However, the behavior of hydrogen in aluminum alloys has not been clearly elucidated yet. Therefore, it is necessary to analyze the hydrogen behavior in aluminum alloys. Hydrogen microprint technique （HMPT） has been known as an effective measure to investigate the hydrogen behavior. In the present study, the emission behavior of internal hydrogen on a tensile-deformed Al-9%Mg alloy was investigated bv HMPT at room temoerature. As a result, the hydrogen was emitted at some grain boundaries.
基金supported by a grant from the Research Grants Council of Hong Kong SAR,China(Grant No.15213522).
文摘Accelerometers are crucial sensors that measure acceleration resulting from motion or vibration.Compared with their electromechanical counterparts,optical accelerometers are widely regarded as the most promising technology for high-requirement applications.However,compact integration of various optical and mechanical components to create a miniature optomechanical microsystem for acceleration sensing remains a challenge.In this study,we present a miniature optical fiber accelerometer based on a 3D microprinted ferrule-top Fabry–Pérot(FP)microinterferometer.In-situ 3D microprinting technology was developed to directly print a sub-millimeter-scale 3D proof mass/thin-film reflector-integrated FP microinterferometer on the inherently light-coupled end face of a fiber optic ferrule.Experimental results demonstrate that the optical fiber accelerometer has a flat response over a bandwidth of 2 to 3 kHz and its noise equivalent acceleration is 62.45μg/Hz under 1-g acceleration at 2 kHz.This ultracompact optical fiber interferometric accelerometer offers several distinct advantages,including immunity to electromagnetic interference,remote-sensing capability,and high customizability,making it highly promising for a variety of stringent acceleration-monitoring applications.
