Signal Processing for Wavelength Scanning Interferometer
نویسندگان
چکیده
منابع مشابه
Two-wavelength holographic interferometer.
In optical testing, when the wave-front error of a test optic is much larger than the wavelength of visible light, it may be difficult to analyze the closely spaced interference fringes in the interferogram. The use of a less-sensitive testing technique or a long-wavelength interferometer would be preferred for this purpose. In addition, when the optic is to be tested in transmission, the wavel...
متن کاملInterferograms Analysis for Wavelength Scanning Interferometer Using Convolution and Fourier-transform
A convolution and fast Fourier transform methods are proposed separately to analysis a set of interferograms obtained from measurement results of a wavelength scanning interferometer. This paper describes wavelength scanning interferometer setup and the operation principle. Mathematical explanations, for both interferograms analysis methods, are presented. Results of measuring 3μm step height s...
متن کاملAccelerated Surface Measurement Using Wavelength Scanning Interferometer with Compensation of Environmental Noise
The optical interferometry systems are widely used for surface metrology. However, the environmental noise and the data analysis approach can limit the measurement performance during inprocess inspection. This paper introduces a wavelength scanning interferometer (WSI) for micro and nano-scale areal surface measurement. The WSI can measure large discontinuous surface profiles without phase ambi...
متن کاملA Full-Duplex, Dual-Polarization 10Gbps Radio over Fiber system with wavelength reuse for upstream signal
This study presents a full-duplex Radio-over-Fiber (RoF) system providing the users' wireless access with a bit rate of 10 Gbps over 40 GHz radio carrier. This system can be used in a centralized radio access network (C-RAN) architecture because we provide a fully analog front haul link between central station and base station. We can consider it as infrastructure between remote radio heads (RR...
متن کاملQuadrature wavelength scanning interferometry.
A novel method to double the measurement range of wavelength scanning interferometery (WSI) is described. In WSI the measured optical path difference (OPD) is affected by a sign ambiguity, that is, from an interference signal it is not possible to distinguish whether the OPD is positive or negative. The sign ambiguity can be resolved by measuring an interference signal in quadrature. A method t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of the Japan Society for Precision Engineering
سال: 2003
ISSN: 1882-675X,0912-0289
DOI: 10.2493/jjspe.69.831