Akademik Veri Yönetim Sistemi
SPIE Photonics West 2019, California, Amerika Birleşik Devletleri, 2 - 07 Şubat 2019, cilt.1088159
The purposed technique enables three-dimensional
surface topography of optically trapped micro-particles via projection of the
fringe pattern that is manufactured by a fiber optic Lloyd’s mirror assembly. A
fiber optic Lloyd's mirror assembly is basically a technique to create an
optical interference pattern using the real light point sources and their
images. In this application this
assembly is combined with an inverted optical microscope body so that, the
projected fringe beam is focused on to the optical path of the interted
microscope. The generated fringe pattern thanks to this technique is deformed
when it is projected on an object's surface and this deformation is placed
right above the objective of the microscope. Fringe positioning, fringe width,
and the separation are easily adjusted by modifying the distance between the
optical fiber and the mirror and the produced fringes are collected with a set
of lenses and projected to the sample surface. The phase analysis of the
acquired image is carried out by One Dimensional Continuous Wavelet Transform method.
The experimental setup is a simple and low cost to construct and is insensitive
to the ambient temperature fluctuations and environmental vibrations that cause
unwanted effects on the projected fringe pattern. This basic experimental setup
enables a reliable and high precision optical topography measurement method in
micro-scale without any high-cost equipment or optical apparatus.
Keywords:
Topics: Optical fiber, Lloyd’s mirror, wavelet transform,
fringe analysis, surface topography, object profile, interferometry