Two-dimensional MTF characterization of a large format CMOS detector

Swaraj Bandhu Mahato; Joris De Ridder; Guy Meynants; Gert Raskin; Hans Van Winckel

doi:10.1117/12.2313012

16 July 2018 Two-dimensional MTF characterization of a large format CMOS detector

Swaraj Bandhu Mahato, Joris De Ridder, Guy Meynants, Gert Raskin, Hans Van Winckel

Proceedings Volume 10709, High Energy, Optical, and Infrared Detectors for Astronomy VIII; 107092X (2018) https://doi.org/10.1117/12.2313012
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

We are characterizing a 7638 x 5004 front-side illuminated CMOS detector for astronomical application. Mod- ulation Transfer Function (MTF) of a detector is considered as an important figure of merit for accurate target positioning in astronomy. It states the upper limit of the image quality. MTF knowledge also provides a better understanding of the design trade-off. In this work, two-dimensional (2D) sub-micrometer scanning method is used to extract 2D MTF profile of our CMOS detector with a pixel pitch of 6μm. Our optical measurement setup focuses a collimated beam onto the imaging surface with a microscope objective. The spot was scanned in a raster over a single pixel. We generate an oversampled point spread function (PSF) of the detector which contains sub-pixel elements. 2D MTF map is calculated from the measured oversampled PSF. This 2D MTF map is used to characterize the resolving ability of our detector. We analyze the importance of the 2D MTF map to describe the full pixel MTF of the CMOS pixel having low fill-factor. 1D MTFs are calculated from the 2d MTF to do a quantitative comparison of the MTF in horizontal and vertical directions. This study emphasizes advantages and necessity of the 2D MTF for CMOS detector performance analysis, especially for anisotropic resolution.

Citation Download Citation

Swaraj Bandhu Mahato, Joris De Ridder, Guy Meynants, Gert Raskin, and Hans Van Winckel "Two-dimensional MTF characterization of a large format CMOS detector", Proc. SPIE 10709, High Energy, Optical, and Infrared Detectors for Astronomy VIII, 107092X (16 July 2018); https://doi.org/10.1117/12.2313012

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available