Phase error evaluation technique based on Fourier transform for refractive index detection limit of microfluidic differential refractometer

A novel phase error evaluation technique based on Fourier Transform Method is presented to estimate the phase error resolution from the spatial interference pattern. The highest phase error resolution is 3.4 × 10−8 × 2 π rad in simulation. The simulation has shown the validity of the proposed techni...

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Bibliographic Details
Published in:Optik (Stuttgart) 2016-10, Vol.127 (19), p.7973-7977
Main Authors: Ji, Weibang, Zhang, Jianguo
Format: Article
Language:English
Subjects:
CCD cameras
Differential refractometer
Fourier analysis
Fourier transforms
Interference fringes
Microfluidic
Microfluidics
Phase error
Phase error evaluation
Pixels
Refractometers
Simulation
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Summary:A novel phase error evaluation technique based on Fourier Transform Method is presented to estimate the phase error resolution from the spatial interference pattern. The highest phase error resolution is 3.4 × 10−8 × 2 π rad in simulation. The simulation has shown the validity of the proposed technique compared to the result in real experiment. The influence of bit depth, size of the pixel and the spatial period of the interference fringe on the phase error resolution is also discussed in detail. The results are helpful for choosing the suitable parameters of CCD camera and controlling the whole size of the integrated microfluidic differential refractometer.
ISSN:0030-4026
1618-1336
DOI:10.1016/j.ijleo.2016.05.160