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An end-to-end optical testing effort validated that an optical path with four co-aligned telescopes and FUV photonic channels could illuminate spectrograph optics under controlled vacuum conditions. Hardware and procedure details address collimator assembly and alignment, including an OETET-driven schedule and cost-conscious testing approach. 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End-to-end testing verifies optical alignment and system behavior under vacuum conditions that match the flight environment.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What optical components and signal paths were validated in the FUSE end-to-end optical test?",{"text":117,"@type":113},"The test validated four co-aligned telescopes feeding FUV photonic channels into spectrograph systems, using collimator assembly and alignment practices designed to illuminate the instrument optics correctly.",{"name":119,"@type":110,"acceptedAnswer":120},"Why was the testing plan combined with the thermal-vacuum (TV) approach, and what risks were associated?",{"text":121,"@type":113},"Combining the OETET with the TV test reduced cost and schedule impact by reusing the larger vacuum capability during integration. Risks included potential problems discovered late, light-source constraints inside sealed vacuum environments, and remote control requirements for the light sources and collimating 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&RORUDGR􀀑 􀀕 7KH WHOHVFRSHV ZHUH DOLJQHGWR WKH VSHFWURJUDSK XVLQJ QRQ􀀐)89 WHFKQLTXHV􀀏 DV GHVFULEHG HOVHZKHUH􀀑 􀀖  \n:H GLVFXVV WKH KDUGZDUH DQG SURFHGXUH XVHG WR H[HFXWH WKH RSWLFDO ¦HQG􀀐WR􀀐HQG§ WHVW 􀀋2(7(7􀀌 RI WKH )86( LQVWUXPHQW􀀑 7KLV WHVW ZDV FRPSOLFDWHG E\\ D QXPEHU RI FULWLFDO LVVXHV􀀏 LQFOXGLQJ GLUHFWLQJ ERWK YLVLEOH DQG )89 SKRWRQV LQWR WKH V\\VWHP􀀏 UHPRWHO\\ RSHUDWLQJ WKH WHVW KDUGZDUH LQ D YDFXXP FKDPEHU􀀏 DQG VFKHGXOH DQG FRVW FRQWURO􀀑 7KH 2(7(7 ZDV H[HFXWHG ODWH 􀀔􀀜􀀜􀀛 DQG HDUO\\ 􀀔􀀜􀀜􀀜 DW 1$6$􀀒*RGGDUG 6SDFH )OLJKW &HQWHU 􀀋*6)&􀀌􀀑  \n7KH 2(7(7 ZDV QRW LQWHQGHG WR SHUIRUP D FRPSOHWH UDGLRPHWULF DQG ZDYHOHQJWK FDOLEUDWLRQ RI WKH )86( LQVWUXPHQW􀀑 ,WVPRUH OLPLWHG REMHFWLYHV ZHUH WKUHH􀀐IROG􀀝  \nx VKRZ WKDW WKH RSWLFDO V\\VWHP KDG QR JURVV GHIHFWV  \nx SURYLGH VWLPXOL WR WKH V\\VWHP WR VXSSRUW IOLJKW VLPXODWLRQV  \nx SURYLGH DQ HQYLURQPHQW IRU WHVWLQJ LQ􀀐IOLJKW RSWLFDO DOLJQPHQW WHFKQLTXHV  \n7KH WUDQ","cbCaimK4tt7qWA8E","https://ap.wps.com/l/cbCaimK4tt7qWA8E","pdf",646638,13,"English","# Introduction\n# Correspondence\n# Associated hardware and procedure\n# Test method\n## Original concept\n## Final concept\n## Associated risks","[{\"question\":\"What is the Far Ultraviolet Spectroscopic Explorer (FUSE) and why was it tested end-to-end?\",\"answer\":\"FUSE is a NASA satellite program designed for far-ultraviolet, high spectral resolving power. End-to-end testing verifies optical alignment and system behavior under vacuum conditions that match the flight environment.\"},{\"question\":\"What optical components and signal paths were validated in the FUSE end-to-end optical test?\",\"answer\":\"The test validated four co-aligned telescopes feeding FUV photonic channels into spectrograph systems, using collimator assembly and alignment practices designed to illuminate the instrument optics correctly.\"},{\"question\":\"Why was the testing plan combined with the thermal-vacuum (TV) approach, and what risks were associated?\",\"answer\":\"Combining the OETET with the TV test reduced cost and schedule impact by reusing the larger vacuum capability during integration. Risks included potential problems discovered late, light-source constraints inside sealed vacuum environments, and remote control requirements for the light sources and collimating optics.\"}]","The Far Ultraviolet Spectroscopic Explorer (FUSE) - Optical End-to-End Test Success in June 2006 | PDF",33]