Abstract
Appendix 1 gives examples of the types of modulating signals used for measurement purposes and most of these have been applied to modulate light in fibre optic sensor systems. However radiant signals embrace a wider field than that of optics so there are a few examples of certain forms of radiant energy being capable of modulating optical systems eg the Cherenkov effect. In order to examine modulating techniques in a logical way it is usual to classify them as five separate effects resulting in change of intensity, wavelength, phase, polarization or time. This classification can be arbitrary depending on how one frames the rules. For example, an interferometric sensor can be regarded as a device measuring either a time delay or a phase lag. Again a photoelastic force sensor modulates polarised light but the measurement can be in the form of an intensity signal. In spite of the ambivalence of the classification system it is generally the simplest and the preferred method of analysing modulating techniques. The characteristics of optical fibres are important parameters in the modulating process. A variety of characteristics and materials can be found in the various types of fibre, - monomode, multimode, birefringent and coated.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Similar content being viewed by others
References
Mechanical Technology Inc. Latham, New York.
Fields, J N et al. 1980 J Acoust. Soc. Am 67 p§16
Bailey Meter Company, USA Tech.Literature
Lyle, J H and Pitt, C W, 1981 Electron. Letts 17 p244
Pilkington Cryogenic Monitoring System: Tech literature.
Murphy, R J and Turner, D M. 1981 US Patent Application 2, 062, 877
British Patent 1,390,426
Ishikawajima, Harima Heavy Industries (1983) Technical literature.
Pitt, G B etal. Trans I Mar E 1980 92 Pater 8 pp 66–75
Ramakrishnan, S and Kersten, R Th 1984 OFS Conf Proc ppl05–110 Stuttgart.
Sharm, M and Brooks, R E 1980 SPIE 224 pp 46–52
Geake, J E 1954 J Sci. Instrum. 31 pp 260–261
Fromm, I 1980 Europatent 0, 025, 565.
Sincerbox, G T and Gordon, S G 1981 Laser Focus. Nov. pp 55–58
Montgomery, J D and Dixon, F W 1981 ISA/IMC Prof. Conf. “Promecom 81” London, pp 81–90
Snell, D and Pitt, G D 1983 BHRA Proc Int. Conf. Opt Tech in Process Control pp 27–41
Dakin, J P 1984 Plessey Technical Journal “Systems Technology” May No. 38
Bell, D etal. West Glamorgan Institute of Higher Education.
Spencer, K etal. 1983 IEE Proc. 1st Int.Conf. on Opt.Fibre Sensors, pp96–99
Spooner R C, “Fibre Optics in Physical and Chemical Sensors” IMC Conf., Harrogate, Nov. 1985.
Culshaw B, J Phys. E 16 No. 10 pp 978–986 1983.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1987 Martinus Nijhoff Publishers, Dordrecht
About this chapter
Cite this chapter
Medlock, R.S. (1987). Fibre Optic Intensity Modulated Sensors. In: Chester, A.N., Martellucci, S., Scheggi, A.M.V. (eds) Optical Fiber Sensors. NATO ASI Series, vol 132. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3611-9_6
Download citation
DOI: https://doi.org/10.1007/978-94-009-3611-9_6
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-8116-0
Online ISBN: 978-94-009-3611-9
eBook Packages: Springer Book Archive