Experimental demonstration of wave-front coded imaging with a very low response of the modulation transfer function at the Nyquist frequency

2019 ◽  
Vol 58 (35) ◽  
pp. 9562
Author(s):  
Hui Zhao ◽  
Jiao Mi ◽  
Congcong Yu ◽  
Rui Ge ◽  
Xuewu Fan
Keyword(s):  
Transfer Function ◽  
Wave Front ◽  
Modulation Transfer Function ◽  
Experimental Demonstration ◽  
Nyquist Frequency ◽  
Modulation Transfer

Measurement and experiment of modulation transfer function at Nyquist frequency for space optical cameras

2015 ◽  
Vol 23 (5) ◽  
pp. 1484-1489
Author(s):  
吕恒毅 LV Heng-yi ◽  
薛旭成 XUE Xu-cheng ◽  
赵运隆 ZHAO Yun-long ◽  
韩诚山 HAN Cheng-shan
Keyword(s):  
Transfer Function ◽  
Modulation Transfer Function ◽  
Nyquist Frequency ◽  
Modulation Transfer

Fully Automated Measurement of the Modulation Transfer Function of Charge-Coupled Devices above the Nyquist Frequency

2012 ◽  
Vol 18 (2) ◽  
pp. 336-342 ◽  
Author(s):  
Wouter Van den Broek ◽  
Sandra Van Aert ◽  
Dirk Van Dyck
Keyword(s):  
Transfer Function ◽  
Modulation Transfer Function ◽  
Practical Method ◽  
Automated Measurement ◽  
Image Simulation ◽  
Nyquist Frequency ◽  
Modulation Transfer ◽  
Good Correspondence ◽  
Charge Coupled Devices ◽  
Simulation And Experiment

AbstractThe charge-coupled devices used in electron microscopy are coated with a scintillating crystal that gives rise to a severe modulation transfer function (MTF). Exact knowledge of the MTF is imperative for a good correspondence between image simulation and experiment. We present a practical method to measure the MTF above the Nyquist frequency from the beam blocker's shadow image. The image processing has been fully automated and the program is made public. The method is successfully tested on three cameras with various beam blocker shapes.

A Binary Phase only Pupil Masks for Extending the Depth of Field of a Microscopy

2013 ◽  
Vol 333-335 ◽  
pp. 1591-1596
Author(s):  
Xin Yi Wang ◽  
Zhong Bao Xu ◽  
Zou Shuang
Keyword(s):  
Transfer Function ◽  
Wave Front ◽  
Modulation Transfer Function ◽  
Imaging System ◽  
Depth Of Field ◽  
Modulation Transfer ◽  
Field Range ◽  
Microscopic Imaging ◽  
Annular Ring ◽  
Binary Phase

A binary phase only pupil mask with phase rings is placed on the plane of the aperture to modulate the wave front of the traditional microscopic imaging system, the modulation transfer function curves, obtained by the annular ring aperture applied to the pupil of the imaging system, do not change much within the required depth of field range, therefore, the loss of systems imaging information is avoided,meanwhile the depth of the field is enlarged. The Zemax simulated result shows that it is able to make the depth of field of microscopic imaging system extend 10 times to adopt this method.

Athermalization Design of Wide Field Medium Wave Infrared Optical System

2014 ◽  
Vol 981 ◽  
pp. 295-298
Author(s):  
Lei Zhao ◽  
Zhao Hui Luan ◽  
Yan Ling Xiong ◽  
Li Juan He
Keyword(s):  
Image Quality ◽  
Transfer Function ◽  
Optical System ◽  
Modulation Transfer Function ◽  
Focal Plane ◽  
Image Plane ◽  
Field Of View ◽  
Wide Field ◽  
Nyquist Frequency ◽  
Modulation Transfer

Based on the principle of passive optical athermalization, a wide field medium wave infrared optical system is designed for working at -40℃-60℃. A 320×240 focal plane array (FPA) detector as image plane is used in the system. The system has a field-of-view of 30°×22.72° and a relative aperture of f/2 at 3-5 µm with 100% cold shield efficiency. The modulation transfer function (MTF) of each field is greater than 0.6 at the Nyquist frequency and the maximum distortion is less than 3% at -40℃-60℃. The system can meet the demand of the excellent image quality. This work is valuable for athermalization design of wide field medium wave infrared optical system.

Modulation transfer function of infrared focal plane arrays

2015 ◽  
Author(s):  
S. D. Gunapala ◽  
S. B. Rafol ◽  
D. Z. Ting ◽  
A. Soibel ◽  
C. J. Hill ◽  
...  
Keyword(s):  
Transfer Function ◽  
Modulation Transfer Function ◽  
Focal Plane ◽  
Focal Plane Arrays ◽  
Modulation Transfer ◽  
Infrared Focal Plane Arrays
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