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Sensors 2016, 16(11), 1886; doi:10.3390/s16111886

Wide-Spectrum Microscope with a Long Working Distance Aspherical Objective Based on Obscuration Constraint

1,2,* , 1,* , 1
and
1
1
Institute of Ultra-Precision Optoelectronic Instrument Engineering, Harbin Institute of Technology, Harbin 150001, China
2
Department of Engineering Science, University of Oxford, ParksRoad, Oxford OX1 3PJ, UK
*
Authors to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 26 September 2016 / Revised: 5 November 2016 / Accepted: 7 November 2016 / Published: 9 November 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [4771 KB, uploaded 9 November 2016]   |  

Abstract

We present an approach for an initial configuration design based on obscuration constraint and on-axis Taylor series expansion to realize the design of long working distance microscope (numerical aperture (NA) = 0.13 and working distance (WD) = 525 mm) with a low obscuration aspherical Schwarzschild objective in wide-spectrum imaging (λ = 400–900 nm). Experiments of the testing on the resolution target and inspection on United States Air Force (USAF) resolution chart and a line charge-coupled device (CCD) (pixel size of 14 μm × 56 μm) with different wavelength light sources (λ = 480 nm, 550 nm, 660 nm, 850 nm) were implemented to verify the validity of the proposed method. View Full-Text
Keywords: wide-spectrum microscope; aspherical Schwarzschild objective; low obscuration; long working distance wide-spectrum microscope; aspherical Schwarzschild objective; low obscuration; long working distance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wang, W.; Wang, C.; Liu, J.; Tan, J. Wide-Spectrum Microscope with a Long Working Distance Aspherical Objective Based on Obscuration Constraint. Sensors 2016, 16, 1886.

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