Accurately measuring the form of structured composite surfaces in situ is critical for advanced manufacturing in various engineering fields.However,challenges persist in achieving precision,miniaturization,and calibra...Accurately measuring the form of structured composite surfaces in situ is critical for advanced manufacturing in various engineering fields.However,challenges persist in achieving precision,miniaturization,and calibration using current structured light techniques.In this work,a hybrid structured light with compact configuration is proposed for the in-situ and embedded form metrology of structured composite surfaces.The proposed technique contains three subsystems:phasemeasuring deflectometry(PMD),fringe projection profilometry(FPP),and stereo vision.The PMD subsystem accurately reconstructs the form data of specular surfaces based on the principle of structured light reflection,and the FPP subsystem measures rough surfaces by projecting structured light onto them.Output data from these subsystems are then stitched to reconstruct a complete form of the measured composite surfaces.The compact configuration is explored to reduce the system volume to improve the technique’s portability and embedded measurement ability.With the stereo vision subsystem as an intermediary,a novel calibration method is applied for calculating the relations among the subsystems to improve the hybrid structured light system’s calibration and data stitching accuracy between PMD and FPP subsystems.Three calibration tools are designed and manufactured for the proposed calibration technique.A portable metrology prototype based on the proposed hybrid structured light technique’s principle and configuration is also developed and then calibrated using the novel calibration method.An embedded measurement experiment in a diamond turning machine demonstrates that the proposed techniques can achieve 400 nm form accuracy in specular surface measurement.展开更多
The oxide film formed on TA15 alloy in0.5 mol·L^(-1)H_(2)SO_(4)at different applied potentials is investigated by evaluating the film formation current density,film thickness,surface film composition,valence stat...The oxide film formed on TA15 alloy in0.5 mol·L^(-1)H_(2)SO_(4)at different applied potentials is investigated by evaluating the film formation current density,film thickness,surface film composition,valence state,and the electrochemical characteristics.The relative quantitative spectral analysis revealed by X-ray photoelectron spectroscopy(XPS)and X-ray absorption spectra(XAS)shows that the increasing applied potential promotes the formation of thick and high-valence state films.By contrasting with XAS of the reference titanium oxides,it is found that TiO_(2)within the oxide film changes from anatase type to rutile type with the potential increases to 2.00 V.The oxide film formed at passive region has better protection performance,and with the increase of applied potential,the corrosion resistance of passive film increases,whereas the ND(donor density)values obtained from the Mott-Schottky(MS)results decrease with the increasing applied potential,indicating a better uniformity and protective effect of the oxide film.Based on above facts,the model of the oxide films formed on TA15 at different applied potentials in passive region and dissolve region is proposed.Besides,the existence forms of all the TA15alloying elements under the most corrosion resistant condition are confirmed.展开更多
基金the UK’s Engineering and Physical Sciences Research Council(EPSRC)funding of“The EPSRC Future Advanced Metrology Hub”(EP/P006930/1)the funding of“A Multiscale Digital Twin-Driven Smart Manufacturing System for High Value-Added Products”(EP/T024844/1)the funding of“Next Generation Metrology Driven by Nanophotonics”(EP/T02643X/1).
文摘Accurately measuring the form of structured composite surfaces in situ is critical for advanced manufacturing in various engineering fields.However,challenges persist in achieving precision,miniaturization,and calibration using current structured light techniques.In this work,a hybrid structured light with compact configuration is proposed for the in-situ and embedded form metrology of structured composite surfaces.The proposed technique contains three subsystems:phasemeasuring deflectometry(PMD),fringe projection profilometry(FPP),and stereo vision.The PMD subsystem accurately reconstructs the form data of specular surfaces based on the principle of structured light reflection,and the FPP subsystem measures rough surfaces by projecting structured light onto them.Output data from these subsystems are then stitched to reconstruct a complete form of the measured composite surfaces.The compact configuration is explored to reduce the system volume to improve the technique’s portability and embedded measurement ability.With the stereo vision subsystem as an intermediary,a novel calibration method is applied for calculating the relations among the subsystems to improve the hybrid structured light system’s calibration and data stitching accuracy between PMD and FPP subsystems.Three calibration tools are designed and manufactured for the proposed calibration technique.A portable metrology prototype based on the proposed hybrid structured light technique’s principle and configuration is also developed and then calibrated using the novel calibration method.An embedded measurement experiment in a diamond turning machine demonstrates that the proposed techniques can achieve 400 nm form accuracy in specular surface measurement.
基金financially supported by the National Key Research and Development Program of China(No.2022YFA1603803)the Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)(No.311021013)the support from National Foreign Experts Program(No.G2021105010L)in China for promoting international exchange。
文摘The oxide film formed on TA15 alloy in0.5 mol·L^(-1)H_(2)SO_(4)at different applied potentials is investigated by evaluating the film formation current density,film thickness,surface film composition,valence state,and the electrochemical characteristics.The relative quantitative spectral analysis revealed by X-ray photoelectron spectroscopy(XPS)and X-ray absorption spectra(XAS)shows that the increasing applied potential promotes the formation of thick and high-valence state films.By contrasting with XAS of the reference titanium oxides,it is found that TiO_(2)within the oxide film changes from anatase type to rutile type with the potential increases to 2.00 V.The oxide film formed at passive region has better protection performance,and with the increase of applied potential,the corrosion resistance of passive film increases,whereas the ND(donor density)values obtained from the Mott-Schottky(MS)results decrease with the increasing applied potential,indicating a better uniformity and protective effect of the oxide film.Based on above facts,the model of the oxide films formed on TA15 at different applied potentials in passive region and dissolve region is proposed.Besides,the existence forms of all the TA15alloying elements under the most corrosion resistant condition are confirmed.
