Ariel Schwarz, Amir Shemer, and Zeev Zalevsky, "Light intensity and SNR improvement for high-resolution optical imaging via time multiplexed pinhole arrays," Appl. Opt. 53, 4483-4492 (2014)
In this paper, we present a novel method for pinhole optics with variable pinhole arrays. The imaging system is based on a time multiplexing method using variable and moving pinhole arrays. The improved resolution and signal-to-noise ratio are achieved with improved light intensity in the same exposure time, compared with that of a one-pinhole system. This new configuration preserves the advantages of pinhole optics while solving the resolution limitation problem and the long exposure time of such systems. The system also can be used as an addition to several existing optical systems, which use visible and invisible light and x-ray systems.
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Relative light intensity comparison of the Lena test. (a) Light intensity of the obtained image with one and small pinhole system (). (b) Light intensity of the obtained image with one- and large-pinhole system (). (c) Light intensity of the reconstructed image in the multipinhole 1D array system with . Light intensity is similar to the one- and large-pinhole system (). (d) Light intensity improvement of the reconstructed image in the multipinhole 2D array system with .
Relative light intensity. (a) Light intensity of one pinhole (250 μm) system normalized to 1. (b) Light intensity of one pinhole (350 μm) system is better as compared with the 250 μm one-pinhole system, according to the hole area ratio. (c) Multipinhole (250 μm) 1D array system with better light intensity as compared to the one pinhole system with the same hole size.
Table 4.
Total Counts Results: USAF 1951 Resolution Targeta
One-Pinhole System
Multipinhole Array System
(a)
(b)
1D Array Design (c)
2D Array Design (d)
[counts]
1
1.913
2.522
5.545
Relative light intensity (a) Light intensity of one-pinhole (170 μm) system normalized to 1. (b) Light intensity of one-pinhole (250 μm) system is better as compared with the 170 μm one-pinhole system, according to the hole area ratio. (c) Multipinhole (170 μm) 1D array system with better light intensity as compared with that of the one-pinhole system with the same hole size. (d) Multipinhole (170 μm) 2D array system with better light intensity.
Relative light intensity comparison of the Lena test. (a) Light intensity of the obtained image with one and small pinhole system (). (b) Light intensity of the obtained image with one- and large-pinhole system (). (c) Light intensity of the reconstructed image in the multipinhole 1D array system with . Light intensity is similar to the one- and large-pinhole system (). (d) Light intensity improvement of the reconstructed image in the multipinhole 2D array system with .
Relative light intensity. (a) Light intensity of one pinhole (250 μm) system normalized to 1. (b) Light intensity of one pinhole (350 μm) system is better as compared with the 250 μm one-pinhole system, according to the hole area ratio. (c) Multipinhole (250 μm) 1D array system with better light intensity as compared to the one pinhole system with the same hole size.
Table 4.
Total Counts Results: USAF 1951 Resolution Targeta
One-Pinhole System
Multipinhole Array System
(a)
(b)
1D Array Design (c)
2D Array Design (d)
[counts]
1
1.913
2.522
5.545
Relative light intensity (a) Light intensity of one-pinhole (170 μm) system normalized to 1. (b) Light intensity of one-pinhole (250 μm) system is better as compared with the 170 μm one-pinhole system, according to the hole area ratio. (c) Multipinhole (170 μm) 1D array system with better light intensity as compared with that of the one-pinhole system with the same hole size. (d) Multipinhole (170 μm) 2D array system with better light intensity.