{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/24383"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/24383","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Position and velocity sensing measurements using an integrated VCSEL and pin photodetector assembly","abstract":"Made available in DSpace on 2011-05-25T14:40:31Z (GMT). No. of bitstreams: 2 Jefvert_Thomas.pdf: 7841540 bytes, checksum: 9ef9792a0cc33ab293a45a73dce41a0b (MD5) license.txt: 4064 bytes, checksum: 723d56f6be0d118060f2052c1b59a730 (MD5)","abstract_html":"Made available in DSpace on 2011-05-25T14:40:31Z (GMT). No. of bitstreams: 2 Jefvert_Thomas.pdf: 7841540 bytes, checksum: 9ef9792a0cc33ab293a45a73dce41a0b (MD5) license.txt: 4064 bytes, checksum: 723d56f6be0d118060f2052c1b59a730 (MD5)","abstract_has_math":false,"creators":["Jefvert, Thomas M."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Electrical & Computer Engr","degree_department":null,"school":null,"contributors":["Choquette, Kent D."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-25T14:40:31Z","date_published":"2011-05-25T14:40:31Z","updated_at":"2026-07-22T22:25:23Z","subjects":["vertical-cavity surface-emitting laser (VCSEL)","p-type/intrinsic/n-type (PIN) photodetector","position","velocity","integrated","sensing"],"languages":["en"],"rights":["Copyright 2011 Thomas M. 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Jefvert"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/24383"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Made available in DSpace on 2011-05-25T14:40:31Z (GMT). No. of bitstreams: 2 Jefvert_Thomas.pdf: 7841540 bytes, checksum: 9ef9792a0cc33ab293a45a73dce41a0b (MD5) license.txt: 4064 bytes, checksum: 723d56f6be0d118060f2052c1b59a730 (MD5)","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Ingram (wingram2@illinois.edu) on 2011-05-25T14:41:45Z Item is restricted until 2013-05-25T14:41:28Z","Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2013-05-26T10:00:23Z Item was in collections: University of Illinois Dissertations and Theses (ID: 204) Dissertations and Theses - Electrical and Computer Engineering (ID: 446) No. of bitstreams: 3 Jefvert_Thomas.pdf.txt: 37898 bytes, checksum: c1ca48d3b4f2fecd517a2974c6798047 (MD5) Jefvert_Thomas.pdf: 7841540 bytes, checksum: 9ef9792a0cc33ab293a45a73dce41a0b (MD5) license.txt: 4064 bytes, checksum: 723d56f6be0d118060f2052c1b59a730 (MD5)","Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2013-05-26T10:00:23Z","A position sensing optical microsystem that is low-power, non-contact and long-range was characterized. A vertical-cavity surface-emitting laser monolithically integrated with a photodetector packaged in a low profile assembly was used in conjunction with a metallic optical grating. By observing the modulated reflection of laser light off the grating collected by the detector, we can determine the speed and/or the relative position of the grating. The capability of the assembly as a sensor was investigated using a motorized stage and an air gantry motion system. On the air gantry system, the position sensing assembly measured the distance traveled to within 0.875 microns and the velocity to within 3% of the speed measured by conventional means. With the linear actuator, due to the discrete steps of operation, the measured distance was within 3.5 microns and the velocity to within 60%.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-04-28T17:07:41Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Jefvert_Thomas.pdf: 7841540 bytes, checksum: 9ef9792a0cc33ab293a45a73dce41a0b (MD5)"]},{"key":"dc:title","label":"Title","values":["Position and velocity sensing measurements using an integrated VCSEL and pin photodetector assembly"]}]}],"canonical_facts":{"dc:contributor":["Choquette, Kent D."],"dc:creator":["Jefvert, Thomas M."],"dc:date":["2011-05-25T14:40:31Z","2013-05-26T10:00:23Z","2011-05"],"dc:description":["Made available in DSpace on 2011-05-25T14:40:31Z (GMT). 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A vertical-cavity surface-emitting laser monolithically integrated with a photodetector packaged in a low profile assembly was used in conjunction with a metallic optical grating. By observing the modulated reflection of laser light off the grating collected by the detector, we can determine the speed and/or the relative position of the grating. The capability of the assembly as a sensor was investigated using a motorized stage and an air gantry motion system. On the air gantry system, the position sensing assembly measured the distance traveled to within 0.875 microns and the velocity to within 3% of the speed measured by conventional means. With the linear actuator, due to the discrete steps of operation, the measured distance was within 3.5 microns and the velocity to within 60%.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-04-28T17:07:41Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Jefvert_Thomas.pdf: 7841540 bytes, checksum: 9ef9792a0cc33ab293a45a73dce41a0b (MD5)"],"dc:identifier":["http://hdl.handle.net/2142/24383"],"dc:language":["en"],"dc:rights":["Copyright 2011 Thomas M. Jefvert"],"dc:subject":["vertical-cavity surface-emitting laser (VCSEL)","p-type/intrinsic/n-type (PIN) photodetector","position","velocity","integrated","sensing"],"dc:title":["Position and velocity sensing measurements using an integrated VCSEL and pin photodetector assembly"],"thesis:degree_discipline":["Electrical & Computer Engr"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:23Z"}