Potential Application Of Monomode Fibre Optic Interferometric Systems For In Process Measurements

David A. Jackson

doi:10.1117/12.949330

10 March 1989 Potential Application Of Monomode Fibre Optic Interferometric Systems For In Process Measurements

David A. Jackson

Proceedings Volume 1012, In-Process Optical Measurements; (1989) https://doi.org/10.1117/12.949330
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany

Abstract

Fibre optic interferometric sensors (FOIS) are evolving as viable alternatives to alarge number of conventional sensors with extreme resolution coupled with very large dynamic ranges. This is particularly true when the measurand is periodic by nature, such as vibration for example. However, there still remain fundamental problems which must be solved before these new devices can be used routinely in process control measurements for quasi-steady state measurands such as temperature. One of these fundamental problems is associa-ted with the transfer function of the FOIS as its periodic nature can give rise to ambiguous outputs from the sensor on initial 'power up'. Special techniques have been developed for FOIS to solve this ambiguity problem based upon classical extended range interferometry. FOIS can be designed as contact sensors for many of the measurands important in the process control industry or as non-contact absolute measurement systems which can be used to calibrate conventional sensors such as those used for displacement or fluid flow. In this presentation the development of FOIS for temperature, pressure (displacement), flow and level will be discussed as these measurands are particularly important for 'in processing' measurements. In the case of the level measurement the system described is electronically rather than optically coherent.

Citation Download Citation

David A. Jackson "Potential Application Of Monomode Fibre Optic Interferometric Systems For In Process Measurements", Proc. SPIE 1012, In-Process Optical Measurements, (10 March 1989); https://doi.org/10.1117/12.949330

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