大口径非球面光学元件具有优越的光学特性,在激光聚变、空间技术和大型光学望远镜等领域有着越来越广泛的应用。然而大口径非球面元件的大批量生产需要高精度和高效率的数控磨削、抛光技术,同时超精密大中型非球面光学元件大批量制造所面临的巨大挑战推动了现代光学测量技术朝着更高的效率、更高的精度和更高的自动化水平方向发展。根据非球面光学元件的加工工艺,系统总结了磨削阶段测量技术的研究现状,并详细说明了以上技术的原理,最后展望了大口径非球面元件磨削阶段测量技术的发展趋势。

A novel temperature-insensitive strain sensor, based on an in-line Mach-Zehnder interferometer, is fabricated by concatenating two waist-enlarged fiber tapers separated by a short piece of photonic crystal fiber. The interference spectrum of the proposed sensor is analyzed in detail. Experimental results demonstrate that this sensor has a strain sensitivity of 3.02 pm/\mu \varepsilon and maintains the temperature insensitivity feature. The proposed sensor has great potential in diverse sensing applications due to its advantages, such as its compact size, low cost, and simple fabrication process.