Open AccessSensor modulation transfer function measurement using band-limited laser speckle
Author(s) -
Xi Chen,
Nicholas George,
Gennadiy Agranov,
Changmeng Liu,
Bob Gravelle
Publication year - 2008
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.020047
Subject(s) - speckle pattern , optics , polarizer , optical transfer function , spectral density , speckle noise , image sensor , physics , modulation (music) , materials science , birefringence , acoustics , telecommunications , computer science
A new methodology for image sensor modulation transfer function measurement using band-limited laser speckle is presented. We use a circular opal milk glass diffuser illuminated by a 5 mW He-Ne laser and a linear polarizer to generate band-limited speckle on the sensor. The power spectral density cut-off frequency of the speckle is chosen to be twice that of the sensor Nyquist frequency by placing the sensor at the specific Z location along the optical axis. For the speckle input, we calculate the power spectral density at the sensor using the Rayleigh-Sommerfeld integral and then measure the output power spectral density for the speckle pattern captured by the sensor. With these data, the two-dimensional image sensor modulation transfer function (MTF) is calculated.