Electronic speckle pattern interferometry（ESPI） and digital speckle pattern interferometry are wellestablished non-contact measurement methods. They have been widely used to carry out precise deformation mapping. Ho...Electronic speckle pattern interferometry（ESPI） and digital speckle pattern interferometry are wellestablished non-contact measurement methods. They have been widely used to carry out precise deformation mapping. However, the simultaneous two-dimensional（2D） or three-dimensional（3D） deformation measurements using ESPI with phase shifting usually involve complicated and slow equipment. In this Letter, we solve these issues by proposing a modified ESPI system based on double phase modulations with only one laser and one camera. In-plane normal and shear strains are obtained with good quality. This system can also be developed to measure 3D deformation, and it has the potential to carry out faster measurements with a highspeed camera.展开更多
Highly sensitive gas detection plays a crucial role in advanced scientific and technological fields.This paper presents a parts-per-quadrillion(ppq)level ultra-highly sensitive light-induced thermoelectric spectroscop...Highly sensitive gas detection plays a crucial role in advanced scientific and technological fields.This paper presents a parts-per-quadrillion(ppq)level ultra-highly sensitive light-induced thermoelectric spectroscopy(LITES)sensor for the first time.The artificial fish swarm algorithm auto-designed multi-pass cell(MPC)with double helix pattern,and the polymer modified round-head quartz tuning fork(QTF)with low-resonant frequency(f0)were adopted to improve the gas absorption and QTF's detection ability.The obtained MPC,with a long optical path length(OPL)of 25.8 m and a small volume of 165.8 ml,is beneficial for increasing gas absorption while keeping the sensor compact.The novel QTF was structurally optimized to obtain low f0(~9.5 kHz)and modified by polydimethylsiloxane(PDMS)to reduce heat diffusion and enhance vibration amplitude.A strong absorption line of carbon monoxide(CO)located in the mid-infrared region(4.59 pm)was chosen as the target line.The signal-to-noise ratio(SNR)of CO-LITES sensor based on the novel QTF was improved by 10.59 times,reaching the highest level when compared to the commercial QTF.The corresponding minimum detection limit(MDL)was calculated to be 23 ppt.When the integration time of the sensor system was increased to 500 s,the MDL could be improved to 920.7 ppq.Compared to the reported spectroscopy techniques for CO gas detection,the LITES sensor in this study offfers an excellent result in terms of detection sensitivity.展开更多
基金financially supported by the ANR Micromorfing Program(ANR-14-CE07-0035)China Scholarship Council(CSC)the Labex Action
文摘Electronic speckle pattern interferometry（ESPI） and digital speckle pattern interferometry are wellestablished non-contact measurement methods. They have been widely used to carry out precise deformation mapping. However, the simultaneous two-dimensional（2D） or three-dimensional（3D） deformation measurements using ESPI with phase shifting usually involve complicated and slow equipment. In this Letter, we solve these issues by proposing a modified ESPI system based on double phase modulations with only one laser and one camera. In-plane normal and shear strains are obtained with good quality. This system can also be developed to measure 3D deformation, and it has the potential to carry out faster measurements with a highspeed camera.
基金supports from the National Natural Science Foundation of China(Grant no.62335006,62022032,62275065,and 62405078)Key Laboratory of Opto-Electronic Information Acquisition and Manipulation(Anhui University),Ministry of Education(Grant no.OEIAM202202)+1 种基金Fundamental Research Funds for the Central Universities(Grant no.HIT.OCEF.2023011)Heilongjiang Postdoctoral Fund(Grant no.LBHZ23144).
文摘Highly sensitive gas detection plays a crucial role in advanced scientific and technological fields.This paper presents a parts-per-quadrillion(ppq)level ultra-highly sensitive light-induced thermoelectric spectroscopy(LITES)sensor for the first time.The artificial fish swarm algorithm auto-designed multi-pass cell(MPC)with double helix pattern,and the polymer modified round-head quartz tuning fork(QTF)with low-resonant frequency(f0)were adopted to improve the gas absorption and QTF's detection ability.The obtained MPC,with a long optical path length(OPL)of 25.8 m and a small volume of 165.8 ml,is beneficial for increasing gas absorption while keeping the sensor compact.The novel QTF was structurally optimized to obtain low f0(~9.5 kHz)and modified by polydimethylsiloxane(PDMS)to reduce heat diffusion and enhance vibration amplitude.A strong absorption line of carbon monoxide(CO)located in the mid-infrared region(4.59 pm)was chosen as the target line.The signal-to-noise ratio(SNR)of CO-LITES sensor based on the novel QTF was improved by 10.59 times,reaching the highest level when compared to the commercial QTF.The corresponding minimum detection limit(MDL)was calculated to be 23 ppt.When the integration time of the sensor system was increased to 500 s,the MDL could be improved to 920.7 ppq.Compared to the reported spectroscopy techniques for CO gas detection,the LITES sensor in this study offfers an excellent result in terms of detection sensitivity.
