@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

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    dct:description "<p>The Phase Occulted Nulling Coronagraph (PONC), invented by R. Lyon, is a viable and game-changing approach for future arbitrary shaped aperture exoplanet science missions. It enables direct exoplanet imaging with a filled, obscured or segmented telescope due to its field-dependent pupil plane rejection of starlight (nulling) . In FY16 we plan to fabricate and test a set of prototype PONC optics as a proof of the principle.</p><p>The projects full objective is to demonstrate that a given PONC optical design can be fabricated using current state of the art techniques. This serves to demonstrate one of the key remaining issues with the PONC approach, i.e. <em>that the aspheric surfaces of the 4 PONC optics can be fabricated, aligned, tested and achieve, and hold, high contrast imaging</em>. This advances the PONC optics from a simulation (TRL-2) to a lab prototype (TRL-3). Ultimately the PONC optics will be tested in GSFC&rsquo;s laboratory visible nulling coronagraph (VNC). &nbsp;</p><p>GSFC is the lead center for the PONC, it was invented here, and GSFC has a vested interest in it as a potential game-changing exoplanet technology. The science payoff&nbsp;is its ability to (i) image/characterize exoplanets with a segmented aperture telescope, (ii) over a wide field of view, and (iii) with less demanding telescope stability tolerances. The successful fabrication and demonstration of the PONC optics results in&nbsp;<strong><em>improved cost efficiency</em></strong>&nbsp;since our approach relaxes the stability tolerances of segmented telescopes, eases requirements on on-orbit operations and ground testing, resulting in a lower cost mission with the same science yield.&nbsp;</p><p>&nbsp;</p>" ;
    dct:identifier "TECHPORT_40600" ;
    dct:issued "2017-09-01"^^xsd:date ;
    dct:modified "2020-01-29"^^xsd:date ;
    dct:publisher <https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> ;
    dct:title "Phase Occulted Nulling Coronagraph: Instrument Technology Advancement" ;
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    dct:title "Phase Occulted Nulling Coronagraph: Instrument Technology Advancement" ;
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