LNG ships have primary and secondary leakage barriers. The former is composed of welded thin stainless steel or invar plates, while the latter is composed of adhesively bonded glass composite or aluminum foil sheets. The tightness of the secondary barrier is dependent on the wetting characteristics between the adhesive and adherent of the bonded structure during bonding operation, which depends much on the contamination on the adherent surface. An optical sensor for the detection of oil contamination on the aluminum surface for the secondary barrier was developed. The sensor can be operated without direct contact to the adherent surface because the aluminum plate of the secondary barrier has a high optical reflectivity. The change of the light reflecting ratio is used to measure the thickness of the oil layer. The sensor consists of an infrared light emitting diode and a phototransistor as receiver. The circuit design of the sensor and results of experiments are given.
The design of an optical sensor arrangement for the detection of oil contamination in an adhesively bonded structure of a liquefied natural gas (LNG) ship
Entwurf einer Optosensoranordnung zur Detektion von Ölverunreinigungen auf Flüssiggas-Schiffen
Measurement Science and Technology ; 20 , 6 ; 065204/1-065204/10
2009
10 Seiten, 15 Bilder, 14 Quellen
Article (Journal)
English
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