摘要: 深紫外光刻、极紫外光刻和先进光源等现代光学工程需求牵引先进光学制造技术持续发展，要求超光滑光学元件表面粗糙度达到原子级水平以及表面全频段面形误差达到RMS(Root Mean Square)亚纳米量级甚至几十皮米，推动超光滑光学元件制造要求不断逼近物理极限。目前，对于如何实现上述超高精度要求的超光滑加工技术及装备仍然存在技术挑战。尤其对如何实现柱面，椭球面，超环面等复杂曲面的原子量级超光滑加工仍是国内外前沿研究方向。弹性发射加工技术是一种去除函数稳定，超低亚表面缺陷，面向原子级的超光滑加工方法，可以作为加工上述精度要求光学元件的手段。本文总结了弹性发射加工技术的国内外研究现状及最新进展，归纳了弹性发射加工技术的原理，包含流体特性、抛光颗粒运动特性和化学特性，弹性发射加工装备，影响弹性发射加工技术表面粗糙度提升和材料去除效率的因素，分析了弹性发射加工技术面临的问题，展望了未来的发展方向，期望为弹性发射加工技术进一步发展和应用提供一定的参考。
摘要: Acoustic-to-seismic coupling landmine detection technology based on the unique mechanical characteristics of landmines and the acoustic-to-seismic coupling principle has broad application prospects in safe and effective detection of landmines. However, a significant amount of work must be done to study the practical landmine detection system. Among them, the acoustic coupled surface vibration signals are very weak and complicated, which has always been a challenging problem to detect such signals accurately and quickly. In this paper, the non-contact laser measurement techniques of surface vibrations based on the principle of the acoustic-to-seismic coupling landmine detection technology were reviewed, including laser Doppler interferometry, electronic speckle pattern interferometry and laser self-mixing interferometry, etc., and the application feasibility of electronic speckle-shearing pattern interferometry in acoustic-to-seismic coupling landmine detection was analyzed.
摘要: Quasi-distributed fiber sensing systems play an important role in the fields of civil engineering, energy surveying, aerospace, national defense, chemicals, etc. Interrogation technology for quasi-distributed fiber sensing systems based on microwave photonics is widely used in high-speed and high-precision signal demodulation and sensor positioning in optical fiber multiplexing systems. Compared to conventional optical wavelength interrogation, this technology greatly improves system demodulation rate and compensates for the defects of traditional sensor positioning methods. This paper introduces the recent research progress of quasi-distributed fiber sensing interrogation technology based on microwave photonics; compares and analyzes the advantages and disadvantages of several existing microwave demodulation systems from the perspective of their fiber grating quasi-distributed sensing and fiber Fabry-Perot quasi-distributed sensing systems, respectively; and provides a summary of the prospective direction of future research in quasi-distributed fiber sensing interrogation technology based on microwave photonics.