Author
R. N. Claytor
Bio: R. N. Claytor is an academic researcher from Advanced Technology Center. The author has contributed to research in topics: Engineering & Polymer. The author has an hindex of 2, co-authored 2 publications receiving 41 citations.
Topics: Engineering, Polymer, Birefringence, Phase transition, Image warping
Papers
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TL;DR: In this article, the authors used a thermochromic material, cuprous mercuric iodide, to record an on-axis interference pattern, which was subsequently reduced in a two-step photographic process, and reconstruction was accomplished in the visible with He-Ne laser light.
Abstract: Infrared holography at 10.6 μm has been accomplished by using a thermochromic material, cuprous mercuric iodide, to record an on‐axis interference pattern. The pattern is subsequently reduced in a two‐step photographic process, and reconstruction is accomplished in the visible with He–Ne laser light.
29 citations
TL;DR: Reflectance vs temperature measurements on thermochromic Cu(2)HgI(4) show phase transition hysteresis, which forms the basis for recording applications and spatial resolution is shown to be at least as good as 4 microm.
Abstract: Reflectance vs temperature measurements on thermochromic Cu(2)HgI(4) show phase transition hysteresis, which forms the basis for recording applications. Long term reflectance relaxation at room temperature has been noted, together with the ability to invert reflectance from the high temperature phase to the low temperature phase by further addition of energy. Specific heat measurements also show the phase transition hysteresis. Image recording sensitivity measurements indicate that 27 mJ/cm(2) are needed to switch a particular Cu(2)HgI(4) paint sample at its transition. Spatial resolution is shown to be at least as good as 4 microm.
15 citations
03 Oct 2022
TL;DR: In this article , the authors discuss some of these challenges, their effects on the performance of the nanostructures, and some methods for mitigation, as well as some methods to mitigate them.
Abstract: Maintaining the fidelity during mass production of nanostructures over large surface areas poses several challenges. Thin polymer optic components are susceptible to warping, birefringence, and errors in nanostructure form and periodicity. These issues can vary across the entirety of the surface, much more than in smaller injection molded parts. We discuss some of these challenges, their effects on the performance of the nanostructures, and some methods for mitigation.
03 Oct 2022
TL;DR: Several types of polymer viewing screens for imaging thermal infrared scenes have been studied, both experimentally and theoretically as discussed by the authors , and the best candidates will be used to evaluate the quality of polymer thermal imaging optics in a subsequent paper.
Abstract: Several types of polymer viewing screens for imaging thermal infrared scenes have been studied, both experimentally and theoretically. The best candidates will be used to evaluate the quality of polymer thermal imaging optics in a subsequent paper.
Cited by
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TL;DR: In this article, Dichloro and Dibromo described N, N-diethylethylenediamine (N-D) compounds containing N, and N-dimethy1-1,1O-phenanthroline.
148 citations
TL;DR: The optical reconstruction in the visible range (0.532 microm) of digital holograms recorded at long IR wavelengths by means of a spatial light modulator is demonstrated and the high NA achievable at a long IR wavelength allows us to image large objects at reasonable distances.
Abstract: We demonstrate the optical reconstruction in the visible range (0.532μm) of digital holograms recorded at long IR wavelengths (10.6μm) by means of a spatial light modulator. By using an integrated recording-reconstruction system, it is, in fact, feasible to achieve direct imaging of holograms acquired outside the visible range, i.e., in the IR spectrum. By choosing a Fourier recording configuration, the reconstructed image, obtained at about a 20 times shorter wavelength than the acquisition image, exhibits minor aberrations, which do not significantly affect the optical reconstruction. The high NA achievable at a long IR wavelength allows us to image large objects at reasonable distances.
49 citations
TL;DR: This work discusses the development of the digital holographic interferometer and the results obtained on a representative space reflector, first in the laboratory and then during vacuum cryogenic test.
Abstract: Digital holographic interferometry in the long-wave infrared domain has been developed by combining a CO2 laser and a microbolometer array The long wavelength allows large deformation measurements, which are of interest in the case of large space reflectors undergoing thermal changes when in orbit We review holography at such wavelengths and present some specific aspects related to this spectral range on our measurements For the design of our digital holographic interferometer, we studied the possibility of illuminating specular objects by a reflective diffuser We discuss the development of the interferometer and the results obtained on a representative space reflector, first in the laboratory and then during vacuum cryogenic test
49 citations
25 Feb 2015
TL;DR: In this paper, a state-of-the-art state of the art of important advances in the field of digital holography is presented. But the authors are interested in detailing advances related to the fundamentals of holographic metrology, digital holographic microscopy, and full-field vibrometry.
Abstract: ew Tech n iq u es in D ig ial H o lo g ap h y E d ied b y P acal P iart This book is devoted to special techniques in digital holography. The authors establish a synthetic state of the art of important advances in the field of digital holography. They are interested in detailing advances related to fundamentals of digital holography, in-line holography, digital color holographic metrology, digital holographic microscopy, infrared holography and special techniques in full-field vibrometry.
40 citations
TL;DR: Three different interferometric techniques are described, using a long-wave infrared radiation produced by a CO(2) laser and recorded on a microbolometer array, for nondestructive testing of electronic speckle pattern interferometry and digital shearography.
Abstract: We describe three different interferometric techniques (electronic speckle pattern interferometry, digital holographic interferometry, and digital shearography), using a long-wave infrared radiation produced by a CO(2) laser and recorded on a microbolometer array. Experimental results showing how these methods can be used for nondestructive testing are presented. Advantages and disadvantages of these approaches are discussed.
40 citations