The velocity interferometer system for any reflector(VISAR) coupled with a streaked optical pyrometer(SOP) system is used as a diagnostic tool in inertial confinement fusion(ICF) experiments involving equations of sta...The velocity interferometer system for any reflector(VISAR) coupled with a streaked optical pyrometer(SOP) system is used as a diagnostic tool in inertial confinement fusion(ICF) experiments involving equations of state and shock timing.To validate the process of adiabatically compressing the fuel shell through precise tuning of shocks in experimental campaigns for the double-cone ignition(DCI) scheme of ICF, a compact line-imaging VISAR with an SOP system is designed and implemented at the Shenguang-II upgrade laser facility. The temporal and spatial resolutions of the system are better than 30 ps and 7 μm, respectively. An illumination lens is used to adjust the lighting spot size matching with the target size. A polarization beam splitter and λ/4 waveplate are used to increase the transmission efficiency of our system. The VISAR and SOP work at 660 and 450 nm, respectively, to differentiate the signals from the scattered lights of the drive lasers. The VISAR can measure the shock velocity. At the same time, the SOP system can give the shock timing and relative strength. This system has been used in different DCI campaigns, where the generation and propagation processes of multi-shock are carefully diagnosed.展开更多
A type of combined optical fiber interferometric acoustic emission sensor is proposed. The sensor can be independent on the laser source and make light interference by matching the lengths of two arms,so it can be use...A type of combined optical fiber interferometric acoustic emission sensor is proposed. The sensor can be independent on the laser source and make light interference by matching the lengths of two arms,so it can be used to monitor the health of large structure. Theoretical analyses indicate that the system can be equivalent to the Michelson interferometer with two optical fiber loop reflectors,and its sensitivity has been remarkably increased because of the decrease of the losses of light energy. PZT is powered by DC regulator to control the operating point of the system,so the system can accurately detect feeble vibration which is generated by ultrasonic waves propagating on the surface of solid. The amplitude and the frequency of feeble vibration signal are obtained by detecting the output light intensity of interferometer and using Fourier transform technique. The results indicate that the system can be used to detect the acoustic emission signals by the frequency characteristics.展开更多
The Talbot interferometer used for writing fiber Bragg grating(FBG)is analyzed effectively in this paper.Based on electromagnetic theory,a computing model of the Talbot interferometer is established with the temporal ...The Talbot interferometer used for writing fiber Bragg grating(FBG)is analyzed effectively in this paper.Based on electromagnetic theory,a computing model of the Talbot interferometer is established with the temporal and the spatial coherence taken into account and with the turning angle of the reflectors as a critical parameter.The model can provide a more detailed and precise information about the interference field and is used to study the effect of the turning error of the reflectors in writing FBG.The calculation result shows that the turning error has an important effect on the visibility of the far interference field.展开更多
采用任意反射面激光位移干涉测试技术(Displacement Interferometer System for Any Reflector,DISAR)分别获得了聚酯薄膜飞片、铝/聚酯薄膜飞片及铜/聚酯薄膜飞片在金属箔电爆驱动下的速度历程。结果表明,在充电电压为25.4 kV时,聚酯...采用任意反射面激光位移干涉测试技术(Displacement Interferometer System for Any Reflector,DISAR)分别获得了聚酯薄膜飞片、铝/聚酯薄膜飞片及铜/聚酯薄膜飞片在金属箔电爆驱动下的速度历程。结果表明,在充电电压为25.4 kV时,聚酯薄膜飞片在加速腔中的有效加速时间为1.6μs,最高速度约4.4 km·s-1;铝/聚酯薄膜飞片和铜/聚酯薄膜飞片在加速腔中的有效加速时间均大于3.0μs,最高速度均小于4.0 km·s-1。电爆驱动时,飞片材料对其运动特性有较大影响。金属/聚酯薄膜飞片相对于聚酯薄膜飞片更利于保持飞片的运行姿态,但飞行同样距离时其速度要低。展开更多
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant Nos.XDA25030500 and XDA25010300)the CAS Youth Interdisciplinary Team(Grant No.JCTD-2022-05)+2 种基金the Youth Innovation Promotion Association of the Chinese Academy of Sciencesthe National Natural Science Foundation of China(Grant Nos.11873061 and 12073043)the National Key R&D Program of China(Grant Nos.2022YFA1603200 and 2022YFA1603204)。
文摘The velocity interferometer system for any reflector(VISAR) coupled with a streaked optical pyrometer(SOP) system is used as a diagnostic tool in inertial confinement fusion(ICF) experiments involving equations of state and shock timing.To validate the process of adiabatically compressing the fuel shell through precise tuning of shocks in experimental campaigns for the double-cone ignition(DCI) scheme of ICF, a compact line-imaging VISAR with an SOP system is designed and implemented at the Shenguang-II upgrade laser facility. The temporal and spatial resolutions of the system are better than 30 ps and 7 μm, respectively. An illumination lens is used to adjust the lighting spot size matching with the target size. A polarization beam splitter and λ/4 waveplate are used to increase the transmission efficiency of our system. The VISAR and SOP work at 660 and 450 nm, respectively, to differentiate the signals from the scattered lights of the drive lasers. The VISAR can measure the shock velocity. At the same time, the SOP system can give the shock timing and relative strength. This system has been used in different DCI campaigns, where the generation and propagation processes of multi-shock are carefully diagnosed.
基金the Fundamental Research Foundation of Harbin Engineering University, (grant number HEUF 04017)
文摘A type of combined optical fiber interferometric acoustic emission sensor is proposed. The sensor can be independent on the laser source and make light interference by matching the lengths of two arms,so it can be used to monitor the health of large structure. Theoretical analyses indicate that the system can be equivalent to the Michelson interferometer with two optical fiber loop reflectors,and its sensitivity has been remarkably increased because of the decrease of the losses of light energy. PZT is powered by DC regulator to control the operating point of the system,so the system can accurately detect feeble vibration which is generated by ultrasonic waves propagating on the surface of solid. The amplitude and the frequency of feeble vibration signal are obtained by detecting the output light intensity of interferometer and using Fourier transform technique. The results indicate that the system can be used to detect the acoustic emission signals by the frequency characteristics.
基金supported by the National Nature Science Foundation of China (No.60077023).
文摘The Talbot interferometer used for writing fiber Bragg grating(FBG)is analyzed effectively in this paper.Based on electromagnetic theory,a computing model of the Talbot interferometer is established with the temporal and the spatial coherence taken into account and with the turning angle of the reflectors as a critical parameter.The model can provide a more detailed and precise information about the interference field and is used to study the effect of the turning error of the reflectors in writing FBG.The calculation result shows that the turning error has an important effect on the visibility of the far interference field.
文摘采用任意反射面激光位移干涉测试技术(Displacement Interferometer System for Any Reflector,DISAR)分别获得了聚酯薄膜飞片、铝/聚酯薄膜飞片及铜/聚酯薄膜飞片在金属箔电爆驱动下的速度历程。结果表明,在充电电压为25.4 kV时,聚酯薄膜飞片在加速腔中的有效加速时间为1.6μs,最高速度约4.4 km·s-1;铝/聚酯薄膜飞片和铜/聚酯薄膜飞片在加速腔中的有效加速时间均大于3.0μs,最高速度均小于4.0 km·s-1。电爆驱动时,飞片材料对其运动特性有较大影响。金属/聚酯薄膜飞片相对于聚酯薄膜飞片更利于保持飞片的运行姿态,但飞行同样距离时其速度要低。
