Development of thermographic inspection routine exploiting phase transition of water for moisture detection in aircraft structures

Eetta Saarimäki, Peter Ylinen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

2 Citations (Scopus)

Abstract

Penetrated water in the composite sandwich structures has caused problems in aircraft structures. Flight surfaces have been lost during the flights, because moisture corrodes the honeycomb and further reduces the strength of the adhesive. Water can also cause additional defects during the composite repairs, which have resulted because of the expansion of the moisture (in closed cavity), hence causing skin blow core phenomena during the curing cycle (heating) of the repair. Thermographic investigation is done to find a suitable procedure to find penetrated water from the composite aircraft structures by cooling the whole structure, or separated parts of the aircraft, under freezing conditions. Thermographic inspection based on the phase transition of water exploits the phase transition energy that is needed for the water defrosting (melting). Advantage of this method is that no additional excitation source is needed for the tests. Method based on phase transition can be especially exploited during the long period of arctic weather conditions in Finland and other cold areas. Aircraft can be either inspected right after a flight, or it can be left outside in freezing conditions overnight and inspected when it has been brought in to the maintenance hall to warm conditions.
Original languageEnglish
Title of host publicationThermosense XXXI
PublisherInternational Society for Optics and Photonics SPIE
Pages729911-1 - 729911-9
ISBN (Print)9780819475657
DOIs
Publication statusPublished - 2009
MoE publication typeA4 Article in a conference publication
EventThermosense XXXI: SPIE Defence, Security and Sensing - Orlando, United States
Duration: 13 Apr 200917 Apr 2009

Publication series

SeriesProceedings of SPIE
Number7299
ISSN0277-786X

Conference

ConferenceThermosense XXXI
CountryUnited States
CityOrlando
Period13/04/0917/04/09

Fingerprint

Moisture
Inspection
Phase transitions
Aircraft
Water
Freezing
Composite materials
Repair
Defrosting
Sandwich structures
Curing
Adhesives
Skin
Melting
Cooling
Heating
Defects

Keywords

  • composites
  • thermal NDI
  • phase transition of water

Cite this

Saarimäki, E., & Ylinen, P. (2009). Development of thermographic inspection routine exploiting phase transition of water for moisture detection in aircraft structures. In Thermosense XXXI (pp. 729911-1 - 729911-9). International Society for Optics and Photonics SPIE. Proceedings of SPIE, No. 7299 https://doi.org/10.1117/12.818114
Saarimäki, Eetta ; Ylinen, Peter. / Development of thermographic inspection routine exploiting phase transition of water for moisture detection in aircraft structures. Thermosense XXXI. International Society for Optics and Photonics SPIE, 2009. pp. 729911-1 - 729911-9 (Proceedings of SPIE; No. 7299).
@inproceedings{20949a72f17a4579a2dd73fbc2d29cae,
title = "Development of thermographic inspection routine exploiting phase transition of water for moisture detection in aircraft structures",
abstract = "Penetrated water in the composite sandwich structures has caused problems in aircraft structures. Flight surfaces have been lost during the flights, because moisture corrodes the honeycomb and further reduces the strength of the adhesive. Water can also cause additional defects during the composite repairs, which have resulted because of the expansion of the moisture (in closed cavity), hence causing skin blow core phenomena during the curing cycle (heating) of the repair. Thermographic investigation is done to find a suitable procedure to find penetrated water from the composite aircraft structures by cooling the whole structure, or separated parts of the aircraft, under freezing conditions. Thermographic inspection based on the phase transition of water exploits the phase transition energy that is needed for the water defrosting (melting). Advantage of this method is that no additional excitation source is needed for the tests. Method based on phase transition can be especially exploited during the long period of arctic weather conditions in Finland and other cold areas. Aircraft can be either inspected right after a flight, or it can be left outside in freezing conditions overnight and inspected when it has been brought in to the maintenance hall to warm conditions.",
keywords = "composites, thermal NDI, phase transition of water",
author = "Eetta Saarim{\"a}ki and Peter Ylinen",
year = "2009",
doi = "10.1117/12.818114",
language = "English",
isbn = "9780819475657",
series = "Proceedings of SPIE",
publisher = "International Society for Optics and Photonics SPIE",
number = "7299",
pages = "729911--1 -- 729911--9",
booktitle = "Thermosense XXXI",
address = "United States",

}

Saarimäki, E & Ylinen, P 2009, Development of thermographic inspection routine exploiting phase transition of water for moisture detection in aircraft structures. in Thermosense XXXI. International Society for Optics and Photonics SPIE, Proceedings of SPIE, no. 7299, pp. 729911-1 - 729911-9, Thermosense XXXI, Orlando, United States, 13/04/09. https://doi.org/10.1117/12.818114

Development of thermographic inspection routine exploiting phase transition of water for moisture detection in aircraft structures. / Saarimäki, Eetta; Ylinen, Peter.

Thermosense XXXI. International Society for Optics and Photonics SPIE, 2009. p. 729911-1 - 729911-9 (Proceedings of SPIE; No. 7299).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - Development of thermographic inspection routine exploiting phase transition of water for moisture detection in aircraft structures

AU - Saarimäki, Eetta

AU - Ylinen, Peter

PY - 2009

Y1 - 2009

N2 - Penetrated water in the composite sandwich structures has caused problems in aircraft structures. Flight surfaces have been lost during the flights, because moisture corrodes the honeycomb and further reduces the strength of the adhesive. Water can also cause additional defects during the composite repairs, which have resulted because of the expansion of the moisture (in closed cavity), hence causing skin blow core phenomena during the curing cycle (heating) of the repair. Thermographic investigation is done to find a suitable procedure to find penetrated water from the composite aircraft structures by cooling the whole structure, or separated parts of the aircraft, under freezing conditions. Thermographic inspection based on the phase transition of water exploits the phase transition energy that is needed for the water defrosting (melting). Advantage of this method is that no additional excitation source is needed for the tests. Method based on phase transition can be especially exploited during the long period of arctic weather conditions in Finland and other cold areas. Aircraft can be either inspected right after a flight, or it can be left outside in freezing conditions overnight and inspected when it has been brought in to the maintenance hall to warm conditions.

AB - Penetrated water in the composite sandwich structures has caused problems in aircraft structures. Flight surfaces have been lost during the flights, because moisture corrodes the honeycomb and further reduces the strength of the adhesive. Water can also cause additional defects during the composite repairs, which have resulted because of the expansion of the moisture (in closed cavity), hence causing skin blow core phenomena during the curing cycle (heating) of the repair. Thermographic investigation is done to find a suitable procedure to find penetrated water from the composite aircraft structures by cooling the whole structure, or separated parts of the aircraft, under freezing conditions. Thermographic inspection based on the phase transition of water exploits the phase transition energy that is needed for the water defrosting (melting). Advantage of this method is that no additional excitation source is needed for the tests. Method based on phase transition can be especially exploited during the long period of arctic weather conditions in Finland and other cold areas. Aircraft can be either inspected right after a flight, or it can be left outside in freezing conditions overnight and inspected when it has been brought in to the maintenance hall to warm conditions.

KW - composites

KW - thermal NDI

KW - phase transition of water

U2 - 10.1117/12.818114

DO - 10.1117/12.818114

M3 - Conference article in proceedings

SN - 9780819475657

T3 - Proceedings of SPIE

SP - 729911-1 - 729911-9

BT - Thermosense XXXI

PB - International Society for Optics and Photonics SPIE

ER -

Saarimäki E, Ylinen P. Development of thermographic inspection routine exploiting phase transition of water for moisture detection in aircraft structures. In Thermosense XXXI. International Society for Optics and Photonics SPIE. 2009. p. 729911-1 - 729911-9. (Proceedings of SPIE; No. 7299). https://doi.org/10.1117/12.818114