{"id":{"repo_id":"vu-aus","oai_identifier":"oai:eprints.vu.edu.au:18164"},"canonical_url":"https://search.dev.ndltd.org/etd/vu-aus/oai:eprints.vu.edu.au:18164","repository":{"repo_id":"vu-aus","name":"Victoria University (Australia)","base_url":"https://vuir.vu.edu.au/cgi/oai2"},"display":{"title":"Fibre optic sensor for speed measurement","abstract":"Determination of speed is an important requirement in a wide variety of technical and industrial applications. The measurement of speed has evolved from pure mechanical to magnetoelectric and radio frequency (RF) based devices. There is however a demand for low-cost sensors capable of operating in potentially hazardous environments in which optical fibre sensors are more suited. In this thesis the development of a non-intrusive speed measurement sensor, based on optical technology is described. The optical fibre sensor described herein gives an almost instantaneous indication of the speed and is compared to a commercial speed sensor (Cateye, 1993) which relies on a magnet attached to a rotating surface yielding an averaged speed reading over several revolutions. The optical speed sensor requires incoherent light, conveniently provided by two low cost 780 nm CD-type laser diodes. The light was directed through a pair of spatially displaced fibres illuminating the moving surface. Some of the back-scattered light from the moving surface was collected by a second pair of fibres leading to two photodiodes (where the light information was converted into an electrical signal). An analogue to digital converter in conjunction with a PC (386SX-33) was used to digitise the signals from the photodiodes. The numeric data was then used to compute the speed of the moving surface using a cross-correlation technique. The optical fibre speed sensor was tested successfully on a large number of surfaces at speeds up to 30 km/h. It showed excellent agreement (better than 3%) with the commercial speed sensor. The absolute accuracy (about 9% at 30 km/h) is limited only by the quality of the analogue to digital converters and indirectly by the data processing capability of the PC.","abstract_html":"Determination of speed is an important requirement in a wide variety of technical and industrial applications. The measurement of speed has evolved from pure mechanical to magnetoelectric and radio frequency (RF) based devices. There is however a demand for low-cost sensors capable of operating in potentially hazardous environments in which optical fibre sensors are more suited. In this thesis the development of a non-intrusive speed measurement sensor, based on optical technology is described. The optical fibre sensor described herein gives an almost instantaneous indication of the speed and is compared to a commercial speed sensor (Cateye, 1993) which relies on a magnet attached to a rotating surface yielding an averaged speed reading over several revolutions. The optical speed sensor requires incoherent light, conveniently provided by two low cost 780 nm CD-type laser diodes. The light was directed through a pair of spatially displaced fibres illuminating the moving surface. Some of the back-scattered light from the moving surface was collected by a second pair of fibres leading to two photodiodes (where the light information was converted into an electrical signal). An analogue to digital converter in conjunction with a PC (386SX-33) was used to digitise the signals from the photodiodes. The numeric data was then used to compute the speed of the moving surface using a cross-correlation technique. The optical fibre speed sensor was tested successfully on a large number of surfaces at speeds up to 30 km/h. It showed excellent agreement (better than 3%) with the commercial speed sensor. The absolute accuracy (about 9% at 30 km/h) is limited only by the quality of the analogue to digital converters and indirectly by the data processing capability of the PC.","abstract_has_math":false,"creators":["Gogoasa, Ion"],"institution":"Victoria University of Technology","degree_name":"other","degree_level":"rmaster","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1996,"date_issued":"1996","date_published":"1996","updated_at":"2026-07-24T06:33:25Z","subjects":["0205 Optical Physics","0915 Interdisciplinary Engineering","School of Engineering and Science"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Gogoasa, Ion"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["1996"]},{"key":"dc:date.issued","label":"Date","values":["1996"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Department of Applied Physics"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["Victoria University of Technology"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://vuir.vu.edu.au/18164/"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["rmaster"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["other"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["0205 Optical Physics","0915 Interdisciplinary Engineering","School of Engineering and Science"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://vuir.vu.edu.au/18164/1/GOGOASA_1996compressed.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Determination of speed is an important requirement in a wide variety of technical and industrial applications. The measurement of speed has evolved from pure mechanical to magnetoelectric and radio frequency (RF) based devices. There is however a demand for low-cost sensors capable of operating in potentially hazardous environments in which optical fibre sensors are more suited. In this thesis the development of a non-intrusive speed measurement sensor, based on optical technology is described. The optical fibre sensor described herein gives an almost instantaneous indication of the speed and is compared to a commercial speed sensor (Cateye, 1993) which relies on a magnet attached to a rotating surface yielding an averaged speed reading over several revolutions. The optical speed sensor requires incoherent light, conveniently provided by two low cost 780 nm CD-type laser diodes. The light was directed through a pair of spatially displaced fibres illuminating the moving surface. Some of the back-scattered light from the moving surface was collected by a second pair of fibres leading to two photodiodes (where the light information was converted into an electrical signal). An analogue to digital converter in conjunction with a PC (386SX-33) was used to digitise the signals from the photodiodes. The numeric data was then used to compute the speed of the moving surface using a cross-correlation technique. The optical fibre speed sensor was tested successfully on a large number of surfaces at speeds up to 30 km/h. It showed excellent agreement (better than 3%) with the commercial speed sensor. The absolute accuracy (about 9% at 30 km/h) is limited only by the quality of the analogue to digital converters and indirectly by the data processing capability of the PC."]},{"key":"dc:format","label":"Dc Format","values":["text"]},{"key":"dc:title","label":"Title","values":["Fibre optic sensor for speed measurement"]}]}],"canonical_facts":{"dc:creator":["Gogoasa, Ion"],"dc:date":["1996"],"dc:date.issued":["1996"],"dc:description.abstract":["Determination of speed is an important requirement in a wide variety of technical and industrial applications. The measurement of speed has evolved from pure mechanical to magnetoelectric and radio frequency (RF) based devices. There is however a demand for low-cost sensors capable of operating in potentially hazardous environments in which optical fibre sensors are more suited. In this thesis the development of a non-intrusive speed measurement sensor, based on optical technology is described. The optical fibre sensor described herein gives an almost instantaneous indication of the speed and is compared to a commercial speed sensor (Cateye, 1993) which relies on a magnet attached to a rotating surface yielding an averaged speed reading over several revolutions. The optical speed sensor requires incoherent light, conveniently provided by two low cost 780 nm CD-type laser diodes. The light was directed through a pair of spatially displaced fibres illuminating the moving surface. Some of the back-scattered light from the moving surface was collected by a second pair of fibres leading to two photodiodes (where the light information was converted into an electrical signal). An analogue to digital converter in conjunction with a PC (386SX-33) was used to digitise the signals from the photodiodes. The numeric data was then used to compute the speed of the moving surface using a cross-correlation technique. The optical fibre speed sensor was tested successfully on a large number of surfaces at speeds up to 30 km/h. It showed excellent agreement (better than 3%) with the commercial speed sensor. The absolute accuracy (about 9% at 30 km/h) is limited only by the quality of the analogue to digital converters and indirectly by the data processing capability of the PC."],"dc:format":["text"],"dc:identifier.uri":["https://vuir.vu.edu.au/18164/1/GOGOASA_1996compressed.pdf"],"dc:language":["en"],"dc:publisher.department":["Department of Applied Physics"],"dc:publisher.institution":["Victoria University of Technology"],"dc:relation.isreferencedby":["https://vuir.vu.edu.au/18164/"],"dc:subject":["0205 Optical Physics","0915 Interdisciplinary Engineering","School of Engineering and Science"],"dc:title":["Fibre optic sensor for speed measurement"],"dc:type":["Thesis"],"dc:type.qualificationlevel":["rmaster"],"dc:type.qualificationname":["other"]},"updated_at":"2026-07-24T06:33:25Z"}