scholarly journals Wide-Field-of-View Longwave Camera for the Characterization of the Earth’s Outgoing Longwave Radiation

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4444
Author(s):  
Luca Schifano ◽  
Lien Smeesters ◽  
Francis Berghmans ◽  
Steven Dewitte
Keyword(s):  
Outgoing Longwave Radiation ◽  
Longwave Radiation ◽  
Cost Effective ◽  
Field Of View ◽  
Wide Field ◽  
Space Applications ◽  
Wide Field Of View ◽  
Camera Design ◽  
Effective Design

The measurement of the Earth’s Outgoing Longwave Radiation plays a key role in climate change monitoring. This measurement requires a compact wide-field-of-view camera, covering the 8–14 µm wavelength range, which is not commercially available. Therefore, we present a novel thermal wide-field-of-view camera optimized for space applications, featuring a field of view of 140° to image the Earth from limb to limb, while enabling a high spatial resolution of 4.455 km at nadir. Our cost-effective design comprises three germanium lenses, of which only one has a single aspherical surface. It delivers a very good image quality, as shown by the nearly-diffraction-limited performance. Radiative transfer simulations indicate excellent performance of our camera design, enabling an estimate of the broadband Outgoing Longwave Radiation with a random relative error of 4.8%.

scholarly journals Fabrication and Characterization of Curved Compound Eyes Based on Multifocal Microlenses

Micromachines ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 854 ◽  
Author(s):  
Gaoge Lian ◽  
Yongshun Liu ◽  
KeKai Tao ◽  
Huaming Xing ◽  
Ruxia Huang ◽  
...  
Keyword(s):  
Compound Eye ◽  
Accurate Method ◽  
Field Of View ◽  
Curved Surface ◽  
Compound Eyes ◽  
Wide Field ◽  
Wide Field Of View ◽  
Field Imaging ◽  
Wide Field Imaging

Curved compound eyes have generated great interest owing to the wide field of view but the application of devices is hindered for the lack of proper detectors. One-lens curved compound eyes with multi-focal microlenses provide a solution for wide field imaging integrated in a commercial photo-detector. However, it is still a challenge for manufacturing this kind of compound eye. In this paper, a rapid and accurate method is proposed by a combination of photolithography, hot embossing, soft photolithography, and gas-assisted deformation techniques. Microlens arrays with different focal lengths were firstly obtained on a polymer, and then the planar structure was converted to the curved surface. A total of 581 compound eyes with diameters ranging from 152.8 µm to 240.9 µm were successfully obtained on one curved surface within a few hours, and the field of view of the compound eyes exceeded 108°. To verify the characteristics of the fabricated compound eyes, morphology deviation was measured by a probe profile and a scanning electron microscope. The optical performance and imaging capability were also tested and analyzed. As a result, the ommatidia made up of microlenses showed not only high accuracy in morphology, but also imaging uniformity on a focal plane. This flexible massive fabrication of compound eyes indicates great potential for miniaturized imaging systems.

Characterization of the AWARE 10 two-gigapixel wide-field-of-view visible imager

2014 ◽  
Vol 53 (13) ◽  
pp. C54 ◽  
Author(s):  
D. L. Marks ◽  
P. R. Llull ◽  
Z. Phillips ◽  
J. G. Anderson ◽  
S. D. Feller ◽  
...  
Keyword(s):  
Field Of View ◽  
Wide Field ◽  
Wide Field Of View

scholarly journals Characterization of the AWARE 40 wide-field-of-view visible imager

Optica ◽  
2015 ◽  
Vol 2 (12) ◽  
pp. 1086 ◽  
Author(s):  
Patrick Llull ◽  
Lauren Bange ◽  
Zachary Phillips ◽  
Kyle Davis ◽  
Daniel L. Marks ◽  
...  
Keyword(s):  
Field Of View ◽  
Wide Field ◽  
Wide Field Of View

scholarly journals Characterization of spatially varying aberrations for wide field-of-view microscopy

2013 ◽  
Vol 21 (13) ◽  
pp. 15131 ◽  
Author(s):  
Guoan Zheng ◽  
Xiaoze Ou ◽  
Roarke Horstmeyer ◽  
Changhuei Yang
Keyword(s):  
Field Of View ◽  
Wide Field ◽  
Wide Field Of View ◽  
Spatially Varying

scholarly journals Optical System Design of a Wide Field-of-View Camera for the Characterization of Earth’s Reflected Solar Radiation

2020 ◽  
Vol 12 (16) ◽  
pp. 2556
Author(s):  
Luca Schifano ◽  
Lien Smeesters ◽  
Francis Berghmans ◽  
Steven Dewitte
Keyword(s):  
Solar Radiation ◽  
Field Of View ◽  
Opening Angle ◽  
Wide Field ◽  
Lens System ◽  
Optical System Design ◽  
Cmos Sensor ◽  
Wide Field Of View ◽  
Commercial Off The Shelf

We report on the conceptual design of a new wide field-of-view shortwave camera, for measuring Earth’s reflected solar radiation. The camera comprises a commercial-off-the-shelf CMOS sensor, and a custom-designed wide field-of-view lens system with an opening angle of 140°. The estimated effective nadir resolution is 2.2 km. The simulated stand-alone random error of the broadband albedo is 3%. The camera is suited for integration within 1U of a CubeSat.

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