Shen S.,Tianjin Jinhang Institute of Technical Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2012
Microsystem is a comprehensive course based on Micro-Electro-Mechanical Systems, manufacturing technology of integrated circuit and other sciences, which is minitype, integrated, intelligent, inexpensive, efficient and productive. The composing and principle on microsystem domestic and oversea were described, the history and status on development of microsystem and distribution of industry were also introduced. Kinds of significant technologies on the machining of micro-structure instrument were presented and the principle, characteristic and technic in wet-etching, deep dry-etching, surface processing, binding, LIGA technology, nanoimprint technology and technology of producting high aspect ratio structures (HARPSS) were analyzed. HARPSS can make devices three-dimensional. Extraordinarily LIGA, which utilizes the excellent permeability of X-ray, can make high aspect ratio greater than 200:1, so that the size of structures can be smaller. The advantages of every technology combined with typical micro device were also pointed out such as mini-capacitor microphone and gear wheel.
Fan J.,Shanghai Electro Mechanical Engineering Institute |
Li L.,Shanghai Electro Mechanical Engineering Institute |
Li W.,Tianjin Jinhang Institute of Technical Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2015
Infrared countermeasure systems and technology have developed for half a century. Several types of infrared countermeasure systems, such as on-board infrared jamming system, infrared decoy and infrared smoke have appeared, and form a huge family of infrared countermeasure systems. In recent years, with the development of advanced infrared imaging guided weapons and technology, the jamming performance of traditional infrared countermeasure systems became more and more dissatisfactory. The technical concept of direct infrared countermeasure (DIRCM) was gradually proposed, which used high-power Xenon lamp or laser as sources of infrared energy. DIRCM has advantageous infrared countermeasure properties, such as the capability of jamming infrared imaging seeker by jamming, dazzling, in-band damaging and out-ofband damaging, etc, the capability of reuse and high jamming efficiency, which makes it suitable for new generation of infrared countermeasure system. The international research on DIRCM systems and technology in recent years was reviewed. And the operational principle, jamming damage mechanism, technology advantage of DIRCM system and the development status abroad were focused. And the research trends of DIRCM system and technology were forecasted in the next years. ©, 2015, Chinese Society of Astronautics. All right reserved.
Chen D.,Harbin Institute of Technology |
He P.,Harbin Institute of Technology |
He P.,Harbin University of Commerce |
Fan R.,Harbin Institute of Technology |
And 4 more authors.
Journal of Physical Chemistry C | Year: 2012
We utilize femtosecond time-resolved electronic resonance-enhanced coherent anti-Stokes Raman scattering (ERE-CARS) to study the vibrational dynamics of cresyl violet 670 (CV670) dye molecules. For this purpose, the vibrational properties of CV670 are registered in diluted solutions of ethanol and methanol. By changing the timing (Δt > 0) of the laser pulses of this nondegenerate four wave mixing technique, the wavepacket dynamics on the electronically ground state can be detected as oscillations in the ERE-CARS signal. Two strong Raman vibrational modes with an average period of 0.401 and 0.423 ps in CV670-ethanol solutions are obtained simultaneously, and we observe a qualitative vibrational dephasing time difference of the Raman vibrational modes of CV670 in ethanol and methanol solvents (5 × 10 -5 mol/L), which may be due to the influence of the formation of the supramolecular structures in CV670-ethanol and CV670-methanol mixtures on the Raman modes of CV670. © 2012 American Chemical Society.
Yu Z.,Beijing Institute of Technology |
Leng J.,Beijing Institute of Technology |
Leng J.,Tianjin Jinhang Institute of Technical Physics |
Xue W.,Beijing Institute of Technology |
And 4 more authors.
Applied Surface Science | Year: 2012
ZnS/Ag/ZnS (ZAZ) multilayer films were prepared on polyethene terephthalate (PET) by ion beam assisted deposition at room temperature. The structural, optical and electrical characteristics of ZAZ multilayers dependent on the thickness of silver layer were investigated. The ZAZ multilayers exhibit a low sheet resistance of about 10 Ω/sq., a high transmittance of 92.1%, and the improved resistance stabilities when subjected to bending. When the inserted Ag thickness is over 12 nm, the ZAZ multilayers show good resistance stabilities due to the existence of a ductile Ag metal layer. The results suggest that ZAZ film has better optoelectrical and anti-deflection characteristics than conventional indium tin oxide (ITO) single layer. © 2011 Elsevier B.V. All rights reserved.
To S.,Hong Kong Polytechnic University |
Zhu Z.,Hong Kong Polytechnic University |
Wang P.,Tianjin Jinhang Institute of Technical Physics
Optical Engineering | Year: 2015
To improve the quality of diamond turned optics, it is necessary to employ a laborious postprocessing approach. However, the approach is often very hard to implement on freeform surfaces, and it greatly decreases the processing efficiency even for simple optics. An evolutionary diamond turning method is first proposed to comprehensively improve the quality of the turned optics. The evolutionary goal is to attenuate the peak value of the power spectral density of residual tool marks, and the special mutation point is observed during the evolution. Taking advantage of the modulation operation of a diamond tool in the spatial frequency domain, form accuracy, surface roughness, and surface reflectivity are all significantly improved, demonstrating the superiority of the EDT method for optics fabrication. © 2015 Society of Photo-Optical Instrumentation Engineers.