Manufacturing and quality evaluation of component integrated fibre optical sensors for condition monitoring

Stefan Sandlin, Harri Jeskanen, Xiaochun Li, Alf Björklöf

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

3 Citations (Scopus)

Abstract

Metal embedding of fibre optical sensors provides new possibilities in structural monitoring. The embedded sensors can either be used for validating of prototype design or for condition monitoring of functional components in service. In this paper two different methods for embedding of optical fibres in high melting point metallic alloys are presented. One method is based on a shape deposition manufacturing process consisting of a combination of electroplating and laser cladding. The other method is based on vacuum brazing. The base materials used are Inconel 600 and stainless steel 304 and 316L. The embedded fibres are equipped with in-fibre Bragg gratings (FBGs) in both cases. First results for temperature and strain measurement using the embedded FBGs are demonstrated. A long term (over five months) elevated temperature test up to 550ºC was also performed as well as a thermal cycling test up to 600ºC lasting a few days. The high temperature capabilities of metal embedded FBGs is thus well demonstrated. Temperature and strain cycling tests are of great importance in final evaluation of the performance of the embedded FBGs. However, during development of the embedding techniques, non-destructive methods for finding pores, cavities or cracks near the fibre are also useful because these defects may have a catastrophic effect on the sensing function and light guiding properties of the embedded fibres. The potential of two non-destructive methods was therefore investigated and found useful. These methods are scanning acoustic microscopy (SAM) and microfocus X-ray tomography.
Original languageEnglish
Title of host publicationBALTICA VI - Life management and maintenance for power plants. Vol. 2
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages659-679
ISBN (Electronic)951-38-6294-1
ISBN (Print)951-38-6293-3
Publication statusPublished - 2004
MoE publication typeB3 Non-refereed article in conference proceedings
EventBALTICA VI - Life Management and Maintenance for Power Plants - Helsinki-Stockholm, Finland
Duration: 8 Jun 200410 Jun 2004

Publication series

SeriesVTT Symposium
Number234
ISSN0357-9387

Conference

ConferenceBALTICA VI - Life Management and Maintenance for Power Plants
CountryFinland
CityHelsinki-Stockholm
Period8/06/0410/06/04

Fingerprint

Fiber optic sensors
Condition monitoring
Fibers
Vacuum brazing
Laser cladding
Strain measurement
Electroplating
Thermal cycling
Fiber Bragg gratings
Metals
Temperature measurement
Temperature
Tomography
Melting point
Optical fibers
Stainless steel
Cracks
X rays
Defects
Monitoring

Keywords

  • optical sensors

Cite this

Sandlin, S., Jeskanen, H., Li, X., & Björklöf, A. (2004). Manufacturing and quality evaluation of component integrated fibre optical sensors for condition monitoring. In BALTICA VI - Life management and maintenance for power plants. Vol. 2 (pp. 659-679). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 234
Sandlin, Stefan ; Jeskanen, Harri ; Li, Xiaochun ; Björklöf, Alf. / Manufacturing and quality evaluation of component integrated fibre optical sensors for condition monitoring. BALTICA VI - Life management and maintenance for power plants. Vol. 2. Espoo : VTT Technical Research Centre of Finland, 2004. pp. 659-679 (VTT Symposium; No. 234).
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abstract = "Metal embedding of fibre optical sensors provides new possibilities in structural monitoring. The embedded sensors can either be used for validating of prototype design or for condition monitoring of functional components in service. In this paper two different methods for embedding of optical fibres in high melting point metallic alloys are presented. One method is based on a shape deposition manufacturing process consisting of a combination of electroplating and laser cladding. The other method is based on vacuum brazing. The base materials used are Inconel 600 and stainless steel 304 and 316L. The embedded fibres are equipped with in-fibre Bragg gratings (FBGs) in both cases. First results for temperature and strain measurement using the embedded FBGs are demonstrated. A long term (over five months) elevated temperature test up to 550ºC was also performed as well as a thermal cycling test up to 600ºC lasting a few days. The high temperature capabilities of metal embedded FBGs is thus well demonstrated. Temperature and strain cycling tests are of great importance in final evaluation of the performance of the embedded FBGs. However, during development of the embedding techniques, non-destructive methods for finding pores, cavities or cracks near the fibre are also useful because these defects may have a catastrophic effect on the sensing function and light guiding properties of the embedded fibres. The potential of two non-destructive methods was therefore investigated and found useful. These methods are scanning acoustic microscopy (SAM) and microfocus X-ray tomography.",
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Sandlin, S, Jeskanen, H, Li, X & Björklöf, A 2004, Manufacturing and quality evaluation of component integrated fibre optical sensors for condition monitoring. in BALTICA VI - Life management and maintenance for power plants. Vol. 2. VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 234, pp. 659-679, BALTICA VI - Life Management and Maintenance for Power Plants, Helsinki-Stockholm, Finland, 8/06/04.

Manufacturing and quality evaluation of component integrated fibre optical sensors for condition monitoring. / Sandlin, Stefan; Jeskanen, Harri; Li, Xiaochun; Björklöf, Alf.

BALTICA VI - Life management and maintenance for power plants. Vol. 2. Espoo : VTT Technical Research Centre of Finland, 2004. p. 659-679 (VTT Symposium; No. 234).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

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T1 - Manufacturing and quality evaluation of component integrated fibre optical sensors for condition monitoring

AU - Sandlin, Stefan

AU - Jeskanen, Harri

AU - Li, Xiaochun

AU - Björklöf, Alf

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Y1 - 2004

N2 - Metal embedding of fibre optical sensors provides new possibilities in structural monitoring. The embedded sensors can either be used for validating of prototype design or for condition monitoring of functional components in service. In this paper two different methods for embedding of optical fibres in high melting point metallic alloys are presented. One method is based on a shape deposition manufacturing process consisting of a combination of electroplating and laser cladding. The other method is based on vacuum brazing. The base materials used are Inconel 600 and stainless steel 304 and 316L. The embedded fibres are equipped with in-fibre Bragg gratings (FBGs) in both cases. First results for temperature and strain measurement using the embedded FBGs are demonstrated. A long term (over five months) elevated temperature test up to 550ºC was also performed as well as a thermal cycling test up to 600ºC lasting a few days. The high temperature capabilities of metal embedded FBGs is thus well demonstrated. Temperature and strain cycling tests are of great importance in final evaluation of the performance of the embedded FBGs. However, during development of the embedding techniques, non-destructive methods for finding pores, cavities or cracks near the fibre are also useful because these defects may have a catastrophic effect on the sensing function and light guiding properties of the embedded fibres. The potential of two non-destructive methods was therefore investigated and found useful. These methods are scanning acoustic microscopy (SAM) and microfocus X-ray tomography.

AB - Metal embedding of fibre optical sensors provides new possibilities in structural monitoring. The embedded sensors can either be used for validating of prototype design or for condition monitoring of functional components in service. In this paper two different methods for embedding of optical fibres in high melting point metallic alloys are presented. One method is based on a shape deposition manufacturing process consisting of a combination of electroplating and laser cladding. The other method is based on vacuum brazing. The base materials used are Inconel 600 and stainless steel 304 and 316L. The embedded fibres are equipped with in-fibre Bragg gratings (FBGs) in both cases. First results for temperature and strain measurement using the embedded FBGs are demonstrated. A long term (over five months) elevated temperature test up to 550ºC was also performed as well as a thermal cycling test up to 600ºC lasting a few days. The high temperature capabilities of metal embedded FBGs is thus well demonstrated. Temperature and strain cycling tests are of great importance in final evaluation of the performance of the embedded FBGs. However, during development of the embedding techniques, non-destructive methods for finding pores, cavities or cracks near the fibre are also useful because these defects may have a catastrophic effect on the sensing function and light guiding properties of the embedded fibres. The potential of two non-destructive methods was therefore investigated and found useful. These methods are scanning acoustic microscopy (SAM) and microfocus X-ray tomography.

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BT - BALTICA VI - Life management and maintenance for power plants. Vol. 2

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Sandlin S, Jeskanen H, Li X, Björklöf A. Manufacturing and quality evaluation of component integrated fibre optical sensors for condition monitoring. In BALTICA VI - Life management and maintenance for power plants. Vol. 2. Espoo: VTT Technical Research Centre of Finland. 2004. p. 659-679. (VTT Symposium; No. 234).