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Theory and Applications of Coupling Based Intensity Modulated Fibre-Optic Sensors
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media. (STC)
2008 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Optical fibre sensors can be used to measure a wide variety of properties. In some cases they have replaced conventional electronic sensors due to their possibility of performing measurements in environments suffering from electromagnetic disturbance, or in harsh environments where electronics cannot survive. In other cases they have had less success mainly due to the higher cost involved in fibre-optic sensor systems. Intensity modulated fibre-optic sensors normally require only low-cost monitoring systems principally based on light emitting diodes and photo diodes. The sensor principle itself is very simple when based on coupling between fibres, and coupling based intensity modulated sensors have found applications over a long time, mainly within position and vibration sensing. In this thesis new concepts and applications for intensity modulated fibre-optic sensors based on coupling between fibres are presented. From a low-cost and standard component perspective alternative designs are proposed and analyzed in order to find improved performance. The development of a sensor for an industrial temperature sensing application, involving aspects on multiplexing and fibre network installation, is presented. Optical time domain reflectometry (OTDR) is suggested as an efficient technique for multiplexing several coupling based sensors, and sensor network installation with blown fibre in micro ducts is proposed as a flexible and cost-efficient alternative to traditional cabling. A new sensor configuration using a fibre to a multicore fibre coupling and an image sensor readout system is proposed. With this system a high-performance sensor setup with a large measurement range can be realised without the need for precise fibre alignment often needed in coupling based sensors involving fibres with small cores. The system performance is analyzed theoretically with complete system simulations on different setups. An experimental setup is made based on standard fibre and image acquisition components, and differences from the theoretical performance are analyzed. It is shown that sub-µm accuracy should be possible to obtain, being the theoretical limit, and it is further suggested that the experimental performance is mainly related to two error sources: core position instability and differences between the real and the expected optical power distribution. Methods to minimize the experimental error are proposed and evaluated.

Place, publisher, year, edition, pages
Sundsvall: Mittuniversitetet , 2008. , p. 99
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 35
Keyword [en]
fibre-optics, sensor, intensity modulation, coupling
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-7057ISBN: 978-91-86073-20-6 (print)OAI: oai:DiVA.org:miun-7057DiVA, id: diva2:117472
Presentation
O111, Mittuniversitetet, Sundsvall (English)
Opponent
Supervisors
Available from: 2008-11-14 Created: 2008-11-13 Last updated: 2011-02-06Bibliographically approved
List of papers
1. Modulation Function Study of Coupling Based Intensity Modulated Fiber-Optic Sensors
Open this publication in new window or tab >>Modulation Function Study of Coupling Based Intensity Modulated Fiber-Optic Sensors
2005 (English)Report (Other academic)
Abstract [en]

The modulation function for fiber-optic sensors based on coupling between fiber ends is studied for different fiber configurations. Sensitivity aspects are evaluated experimentally and theoretically, being shown that multiple passes practically do not increase sensitivity.

Keyword
Fiber optics sensors, Fiber measurements, Modulation
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-4098 (URN)4678 (Local ID)4678 (Archive number)4678 (OAI)
Note
Intern rapport ITM/ElektronikAvailable from: 2009-01-07 Created: 2008-11-13 Last updated: 2016-10-05Bibliographically approved
2. Fiber-Optic Temperature Monitoring in Pulp Production
Open this publication in new window or tab >>Fiber-Optic Temperature Monitoring in Pulp Production
Show others...
2008 (English)In: Transactions of the IWCS: Vol. 1, Eatontown, NJ: International Wire & Cable Symposium , 2008, p. 7-16Conference paper, Published paper (Refereed)
Abstract [en]

A fiber-optic temperature sensor system for monitoring of the cooking process in pulp production has been developed. The sensor system is based on intensity modulation in mechanical fiber connections caused by the temperature dependent deflection of a bimetal strip. The sensor construction includes a fiber positioning device which eliminates the poor coupling efficiency otherwise experienced with coupling based sensors. An OTDR-based control unit monitors the changes in optical power at the sensor points, and the sensor network is realized with blown fiber. The total system is thus a very cost-effective solution. In this paper the development, testing, installation and operation of the sensor system is reported on, showing the system to be suitable for cooking process temperature monitoring.

Place, publisher, year, edition, pages
Eatontown, NJ: International Wire & Cable Symposium, 2008
Series
Transactions of the IWCS, ISSN 1941-4242 ; Vol. 1
Keyword
optical fiber, temperature, sensor, monitoring, pulp, paper, industrial
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Identifiers
urn:nbn:se:miun:diva-11767 (URN)4205 (Local ID)4205 (Archive number)4205 (OAI)
Available from: 2008-11-13 Created: 2008-11-13 Last updated: 2016-10-05Bibliographically approved
3. Monte Carlo Simulation of the Performance of a Fiber-Optic Position Sensor
Open this publication in new window or tab >>Monte Carlo Simulation of the Performance of a Fiber-Optic Position Sensor
2006 (English)In: 18th International Optical Fiber Sensors Conference Technical Digest, Washington, DC: Optical Society of America , 2006, p. TuE48-Conference paper, Published paper (Other academic)
Abstract [en]

A numerical model for evaluation of a position sensor based on a single- to multicore fiber coupling and a real-time processing CMOS camera chip is presented, allowing design of sub-µm resolution, high dynamic range sensors.

Place, publisher, year, edition, pages
Washington, DC: Optical Society of America, 2006
Keyword
Fiber-optics, position, sensor, image analysis
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-3882 (URN)2-s2.0-84899130780 (Scopus ID)4204 (Local ID)1-55752-817-9 (ISBN)4204 (Archive number)4204 (OAI)
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2016-10-05Bibliographically approved
4. Experimental Study of an Intensity Modulated Fiber-Optic Position Sensor with a Novel Readout System
Open this publication in new window or tab >>Experimental Study of an Intensity Modulated Fiber-Optic Position Sensor with a Novel Readout System
2008 (English)In: IEEE Sensors Journal, ISSN 1530-437X, E-ISSN 1558-1748, Vol. 8, no 7, p. 1105-1113Article in journal (Refereed) Published
Abstract [en]

An intensity modulated fiber-optic position sensor, based on a fiber to bundle coupling and a readout system using a CMOS image camera together with fast routines for position extraction and calibration, is experimentally demonstrated. Further a simulation of the complete sensor system setup is made, and possible sources of error are analyzed experimentally. Our analysis indicates the theoretical limit of the system and identifies the causes of system errors. The results are encouraging for further development of the system setup.

Keyword
Image sensors, Intensity modulation, Optical fiber transducers, Optical position measurement.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-4485 (URN)10.1109/JSEN.2008.926522 (DOI)000258526600010 ()2-s2.0-47849127331 (Scopus ID)5524 (Local ID)5524 (Archive number)5524 (OAI)
Note

VR-Ecology

Available from: 2008-11-30 Created: 2008-11-13 Last updated: 2017-10-20Bibliographically approved

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Jason, Johan

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