{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T14:48:35Z","timestamp":1785422915207,"version":"3.56.0"},"reference-count":50,"publisher":"Optica Publishing Group","issue":"15","license":[{"start":{"date-parts":[[2024,5,17]],"date-time":"2024-05-17T00:00:00Z","timestamp":1715904000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR"},{"start":{"date-parts":[[2024,5,17]],"date-time":"2024-05-17T00:00:00Z","timestamp":1715904000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["11505031"],"award-info":[{"award-number":["11505031"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Appl. Opt."],"published-print":{"date-parts":[[2024,5,20]]},"abstract":"<jats:p>\n                    Planar XeBr\n                    <jats:sup>\u2217<\/jats:sup>\n                    and XeCl\n                    <jats:sup>\u2217<\/jats:sup>\n                    excilamps emitting noncoherent narrowband UVB light (280\u2013315\u00a0nm) are now widely used to cure psoriasis and vitiligo as well as to improve vitamin D synthesis. The two-dimensional integral formula has been deducted in this study, which is a good method and has great practical significance to calculate the total radiant power and assess the energy efficiency of a planar UV lamp. The measured radiant power of planar white LED lamps through a two-dimensional Keitz formula has been compared to that of gonio-photometer, verifying the applicability of the formula. The optimum measurement distance is dependent on the lamp length (1.5\n                    <jats:italic>L<\/jats:italic>\n                    \u2264\n                    <jats:italic>D<\/jats:italic>\n                    \u22643.5\n                    <jats:italic>L<\/jats:italic>\n                    ) for which the derivation from the two methods can be controlled within 10%. The planar XeBr\n                    <jats:sup>\u2217<\/jats:sup>\n                    excilamps have been measured and compared to coaxial excilamps, which show similar patterns of change for the radiant characteristics. Since the planar radiant power formula only needs to measure normal illuminance at a certain distance from the symmetric center of the lamp, it is more convenient to use and is a low-cost method to promote the development of large-sized planar ultraviolet lamps.\n                  <\/jats:p>","DOI":"10.1364\/ao.520397","type":"journal-article","created":{"date-parts":[[2024,4,26]],"date-time":"2024-04-26T09:00:07Z","timestamp":1714122007000},"page":"4131","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Two-dimensional Keitz method for the radiant power measurement of planar ultraviolet excilamps"],"prefix":"10.1364","volume":"63","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-5171-3524","authenticated-orcid":true,"given":"Qianwen","family":"Zhu","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/013q1eq08","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fusheng","family":"Li","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/013q1eq08","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2432-7641","authenticated-orcid":true,"given":"Qiuyi","family":"Han","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/013q1eq08","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2545-9462","authenticated-orcid":true,"given":"Shanduan","family":"Zhang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/013q1eq08","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2024,5,17]]},"reference":[{"key":"ao-63-15-4131-R1","doi-asserted-by":"publisher","first-page":"053502","DOI":"10.1063\/1.2907368","volume":"15","author":"Belasri","year":"2008","journal-title":"Phys. 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