{"id":{"repo_id":"soton","oai_identifier":"oai:eprints.soton.ac.uk:65508"},"canonical_url":"https://search.dev.ndltd.org/etd/soton/oai:eprints.soton.ac.uk:65508","repository":{"repo_id":"soton","name":"University of Southampton","base_url":"https://eprints.soton.ac.uk/cgi/oai2"},"display":{"title":"Distributed optical fibre sensors based on the coherent detection of spontaneous Brillouin scattering","abstract":"This thesis reports on the progress that has been made improving the sensing performance of a distributed temperature and strain optical fibre sensor based on the coherent detection of spontaneous Brillouin scattering. To further improve the sensing range and the sensor's performance, the use of Raman amplification was investigated utilising different Raman pump configurations. Using frequency measurements only, a temperature resolution of 5 °C over a 150km sensing range with 50m spatial resolution was achieved using a counter-propagating Raman pump. Using co-propagating Raman pump the temperature resolution was 1.7 °C with 20m spatial resolution at 100km. Measuring both the power and frequency of the Brillouin signal, a simultaneous temperature and strain measurement was performed over 50km; temperature and strain resolutions of 3.5 °C and 85 µε with 5m spatial resolution were achieved, respectively, using co-propagating Raman pump which has the advantage of requiring access to just one end of the sensing fibre.","abstract_html":"This thesis reports on the progress that has been made improving the sensing performance of a distributed temperature and strain optical fibre sensor based on the coherent detection of spontaneous Brillouin scattering. To further improve the sensing range and the sensor's performance, the use of Raman amplification was investigated utilising different Raman pump configurations. Using frequency measurements only, a temperature resolution of 5 °C over a 150km sensing range with 50m spatial resolution was achieved using a counter-propagating Raman pump. Using co-propagating Raman pump the temperature resolution was 1.7 °C with 20m spatial resolution at 100km. Measuring both the power and frequency of the Brillouin signal, a simultaneous temperature and strain measurement was performed over 50km; temperature and strain resolutions of 3.5 °C and 85 µε with 5m spatial resolution were achieved, respectively, using co-propagating Raman pump which has the advantage of requiring access to just one end of the sensing fibre.","abstract_has_math":false,"creators":["Al Ahbabi, Mohammed Nasser"],"institution":"University of Southampton","degree_name":"Ph.D.","degree_level":"doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Newson, Trevor"],"committee_chairs":[],"committee_members":[],"year":2005,"date_issued":"2005-06","date_published":"2005-06","updated_at":"2026-07-24T04:35:58Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Newson, Trevor"]},{"key":"dc:creator","label":"Author","values":["Al Ahbabi, Mohammed Nasser"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2005-06"]},{"key":"dc:date.issued","label":"Date","values":["2005-06"]},{"key":"dc:publisher.commercial","label":"Dc Publisher Commercial","values":["University of Southampton"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Optoelectronics Research Centre (pre 2011 reorg)","Optoelectronic Research Centre"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["University of Southampton"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://eprints.soton.ac.uk/65508/"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["doctoral"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["Ph.D."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://eprints.soton.ac.uk/65508/1/Alahbabi_2005_thesis_3202.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This thesis reports on the progress that has been made improving the sensing performance of a distributed temperature and strain optical fibre sensor based on the coherent detection of spontaneous Brillouin scattering. To further improve the sensing range and the sensor's performance, the use of Raman amplification was investigated utilising different Raman pump configurations. Using frequency measurements only, a temperature resolution of 5 °C over a 150km sensing range with 50m spatial resolution was achieved using a counter-propagating Raman pump. Using co-propagating Raman pump the temperature resolution was 1.7 °C with 20m spatial resolution at 100km. Measuring both the power and frequency of the Brillouin signal, a simultaneous temperature and strain measurement was performed over 50km; temperature and strain resolutions of 3.5 °C and 85 µε with 5m spatial resolution were achieved, respectively, using co-propagating Raman pump which has the advantage of requiring access to just one end of the sensing fibre."]},{"key":"dc:format","label":"Dc Format","values":["text"]},{"key":"dc:title","label":"Title","values":["Distributed optical fibre sensors based on the coherent detection of spontaneous Brillouin scattering"]}]}],"canonical_facts":{"dc:contributor.advisor":["Newson, Trevor"],"dc:creator":["Al Ahbabi, Mohammed Nasser"],"dc:date":["2005-06"],"dc:date.issued":["2005-06"],"dc:description.abstract":["This thesis reports on the progress that has been made improving the sensing performance of a distributed temperature and strain optical fibre sensor based on the coherent detection of spontaneous Brillouin scattering. To further improve the sensing range and the sensor's performance, the use of Raman amplification was investigated utilising different Raman pump configurations. Using frequency measurements only, a temperature resolution of 5 °C over a 150km sensing range with 50m spatial resolution was achieved using a counter-propagating Raman pump. Using co-propagating Raman pump the temperature resolution was 1.7 °C with 20m spatial resolution at 100km. Measuring both the power and frequency of the Brillouin signal, a simultaneous temperature and strain measurement was performed over 50km; temperature and strain resolutions of 3.5 °C and 85 µε with 5m spatial resolution were achieved, respectively, using co-propagating Raman pump which has the advantage of requiring access to just one end of the sensing fibre."],"dc:format":["text"],"dc:identifier.uri":["https://eprints.soton.ac.uk/65508/1/Alahbabi_2005_thesis_3202.pdf"],"dc:publisher.commercial":["University of Southampton"],"dc:publisher.department":["Optoelectronics Research Centre (pre 2011 reorg)","Optoelectronic Research Centre"],"dc:publisher.institution":["University of Southampton"],"dc:relation.isreferencedby":["https://eprints.soton.ac.uk/65508/"],"dc:title":["Distributed optical fibre sensors based on the coherent detection of spontaneous Brillouin scattering"],"dc:type":["Thesis"],"dc:type.qualificationlevel":["doctoral"],"dc:type.qualificationname":["Ph.D."]},"updated_at":"2026-07-24T04:35:58Z"}