Title:

Oxygen pressure measurement using singlet oxygen emission

Author(s):

Khalil, Gamal E.
Chang, Alvin
Gouterman, Martin
Callis, James B.
Dalton, Larry R.
Turro, Nicholas J.
Jockusch, Steffen

Date:

2005

Type:

Articles

Department:

Chemistry

Volume:

76

Permanent URL:

http://hdl.handle.net/10022/AC:P:9345

Book/Journal Title:

Review of Scientific Instruments

Abstract:

Pressure sensitive paint (PSP) provides a visualization of two-dimensional pressure distributions on airfoil and model automobile surfaces. One type of PSP utilizes platinum tetra(pentafluorophenyl)porphine (PtTFPP) dissolved in a fluoro-polymer film. Since the intense 650 nm triplet emission of PtTFPP is quenched by ground state oxygen, it is possible to measure two-dimensional oxygen concentration from the 650 nm emission intensity using a Stern–Volmer-type relationship. This article reports an alternative luminescence method to measure oxygen concentration based on the porphyrin-sensitized 1270 nm singlet oxygen emission, which can be imaged with an InGaAs near infrared camera. This direct measurement of oxygen emission complements and further validates the oxygen measurement based on PtTFPP phosphorescence quenching. Initial success at obtaining a negative correlation between the 650 nm PtTFPP emission and the 1270 nm O2 emission in solution led us to additional two-dimensional film studies using surfaces coated with PtTFPP, MgTFPP, and H2TFPP in polymers in a pressure and temperature controlled chamber.

Subject(s):

Chemistry

DOI:

http://dx.doi.org/10.1063/1.1896623

Item views:

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