2026-09-22T02:38:27Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/24383 2023-07-10 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

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 Choquette, Kent D. Jefvert, Thomas M. 2011-05-25T14:40:31Z 2011-05-25T14:40:31Z 2013-05-26T10:00:23Z 2011-05-25T14:40:31Z 2011-05 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 Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-04-28T17:07:41Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: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) http://hdl.handle.net/2142/24383 en Copyright 2011 Thomas M. Jefvert vertical-cavity surface-emitting laser (VCSEL) p-type/intrinsic/n-type (PIN) photodetector position velocity integrated sensing Position and velocity sensing measurements using an integrated VCSEL and pin photodetector assembly Electrical & Computer Eng 1933 Electrical & Computer Engr 1200 University of Illinois at Urbana-Champaign Thesis M.S. MS:Electr & Computer Eng-UIUC 10KS1200MS