Surface acoustic wave(SAW)devices are a subclass of micro-electromechanical systems(MEMS)that generate an acoustic emission when electrically stimulated.These transducers also work as detectors,converting surface stra...Surface acoustic wave(SAW)devices are a subclass of micro-electromechanical systems(MEMS)that generate an acoustic emission when electrically stimulated.These transducers also work as detectors,converting surface strain into readable electrical signals.Physical properties of the generated SAW are material dependent and influenced by external factors like temperature.By monitoring temperature-dependent scattering parameters a SAW device can function as a thermometer to elucidate substrate temperature.Traditional fabrication of SAW sensors requires labor-and cost-intensive subtractive processes that produce large volumes of hazardous waste.This study utilizes an innovative aerosol jet printer to directly write consistent,high-resolution,silver comb electrodes onto a Y-cut LiNbO3 substrate.The printed,two-port,20 MHz SAW sensor exhibited excellent linearity and repeatability while being verified as a thermometer from 25 to 200℃.Sensitivities of the printed SAW thermometer are−96.9×10^(−6)℃^(−1)and−92.0×10^(-6)℃^(−1) when operating in pulse-echo mode and pulse-receiver mode,respectively.These results highlight a repeatable path to the additive fabrication of compact high-frequency SAW thermometers.展开更多
Soft structural textiles,or softgoods,are used within the space industry for inflatable habitats,parachutes and decelerator systems.Evaluating the safety and structural integrity of these systems occurs through struct...Soft structural textiles,or softgoods,are used within the space industry for inflatable habitats,parachutes and decelerator systems.Evaluating the safety and structural integrity of these systems occurs through structural health monitoring systems(SHM),which integrate non-invasive/non-destructive testing methods to detect,diagnose,and locate damage.Strain/load monitoring of these systems is limited while utilizing traditional strain gauges as these gauges are typically stiff,operate at low temperatures,and fail when subjected to high strain that is a result of high loading classifying them as unsuitable for SHM of soft structural textiles.For this work,a capacitance based strain gauge(CSG)was fabricated via aerosol jet printing(AJP)using silver nanoparticle ink on a flexible polymer substrate.Printed strain gauges were then compared to a commercially available high elongation resistance-based strain gauge(HE-RSG)for their ability to monitor strained Kevlar straps having a 26.7 kN(6 klbf)load.Dynamic,static and cyclic loads were used to characterize both types of strain monitoring devices.Printed CSGs demonstrated superior performance for high elongation strain measurements when compared to commonly used HE-RSGs,and were observed to operate with a gauge factor of 5.2 when the electrode arrangement was perpendicular to the direction of strain.展开更多
基金N.M.acknowledges technical and infrastructure support from Peter Miranda and Travis Gabel of the Idaho Microfabrication Laboratory,as well as general support and feedback from the Advanced Nanomaterials and Manufacturing Laboratory.D.E.acknowledges infrastructure support under DE-NE0008677 and and DE-NE0008496joint appointment support under DOE Idaho Operations Office Contract DE-AC07-05ID14517D.E.and Z.D.also acknowledge career development support from Institutional Development Awards(IDeA)from the National Institute of General Medical Sciences of the National Institutes of Health under Grants#P20GM103408 and P20GM109095.This work was prepared as an account of work sponsored by the U.S.Department of Energy,Office of Nuclear Energy Advanced Sensors and Instrumentation program under DOE Idaho Operations Office Contract DE-AC07-05ID14517.Neither the U.S.Government nor any agency thereof,nor any of their employees,makes any warranty,expressed or implied,or assumes any legal liability or responsibility for the accuracy,completeness,or usefulness,of any information,apparatus,product,or process disclosed,or represents that its use would not infringe privately owned rights.References herein to any specific commercial product,process,or service by trade name,trademark,manufacturer,or otherwise,does not necessarily constitute or imply its endorsement,recommendation,or favoring by the U.S.Government or any agency.The views and opinions of authors expressed herein do not necessarily state or reflect those of the U.S.Government or any agency thereof.
文摘Surface acoustic wave(SAW)devices are a subclass of micro-electromechanical systems(MEMS)that generate an acoustic emission when electrically stimulated.These transducers also work as detectors,converting surface strain into readable electrical signals.Physical properties of the generated SAW are material dependent and influenced by external factors like temperature.By monitoring temperature-dependent scattering parameters a SAW device can function as a thermometer to elucidate substrate temperature.Traditional fabrication of SAW sensors requires labor-and cost-intensive subtractive processes that produce large volumes of hazardous waste.This study utilizes an innovative aerosol jet printer to directly write consistent,high-resolution,silver comb electrodes onto a Y-cut LiNbO3 substrate.The printed,two-port,20 MHz SAW sensor exhibited excellent linearity and repeatability while being verified as a thermometer from 25 to 200℃.Sensitivities of the printed SAW thermometer are−96.9×10^(−6)℃^(−1)and−92.0×10^(-6)℃^(−1) when operating in pulse-echo mode and pulse-receiver mode,respectively.These results highlight a repeatable path to the additive fabrication of compact high-frequency SAW thermometers.
基金This material is based upon work supported under an Integrated University Program Graduate Fellowship,and was supported in part by Department of Energy In-Pile Instrumentation program under DOE Idaho Operations Office Contract DE-AC07-05ID14517 and by the National Aeronautics Space Administration under award#80NSSC18M0088The views and opinions of authors expressed herein do not necessarily state or reflect those of the U.S.Government or any agency thereof.D.E.also acknowledges career development support by Institutional Development Awards(IDeA)from the National Institute of General Medical Sciences of the National Institutes of Health under Grants#P20GM103408 and P20GM109095.
文摘Soft structural textiles,or softgoods,are used within the space industry for inflatable habitats,parachutes and decelerator systems.Evaluating the safety and structural integrity of these systems occurs through structural health monitoring systems(SHM),which integrate non-invasive/non-destructive testing methods to detect,diagnose,and locate damage.Strain/load monitoring of these systems is limited while utilizing traditional strain gauges as these gauges are typically stiff,operate at low temperatures,and fail when subjected to high strain that is a result of high loading classifying them as unsuitable for SHM of soft structural textiles.For this work,a capacitance based strain gauge(CSG)was fabricated via aerosol jet printing(AJP)using silver nanoparticle ink on a flexible polymer substrate.Printed strain gauges were then compared to a commercially available high elongation resistance-based strain gauge(HE-RSG)for their ability to monitor strained Kevlar straps having a 26.7 kN(6 klbf)load.Dynamic,static and cyclic loads were used to characterize both types of strain monitoring devices.Printed CSGs demonstrated superior performance for high elongation strain measurements when compared to commonly used HE-RSGs,and were observed to operate with a gauge factor of 5.2 when the electrode arrangement was perpendicular to the direction of strain.
