Submillisecond response times of oxygen‐quenched luminescent coatings
作者:
Alan E. Baron,
J. D. S. Danielson,
Martin Gouterman,
Jiang River Wan,
James B. Callis,
Blair McLachlan,
期刊:
Review of Scientific Instruments
(AIP Available online 1993)
卷期:
Volume 64,
issue 12
页码: 3394-3402
ISSN:0034-6748
年代: 1993
DOI:10.1063/1.1144310
出版商: AIP
数据来源: AIP
摘要:
An apparatus and data analysis methodology is described which allows determination of response time to oxygen concentration changes of luminescent oxygen sensor coatings. Utilizing a solenoid valve, a sample chamber creates a pressure jump from 0.1 to 700 Torr in 600 &mgr;s that is followed by 15 ms of ringing. An optical detection system measures the response of porphyrin‐based luminescent oxygen sensors to the pressure jump. The pressure in the chamber is measured simultaneously and independently with a piezoresistive pressure transducer. Data analysis techniques using nonlinear least‐squares and numerical convolution of the luminescent response to the pressure rise allow determination of response times of the oxygen sensor. The response to pressure jumps of several luminescent oxygen sensitive coatings designed for video luminescent barometry are measured with this computer‐controlled instrument. Several coatings were studied with response times of ∼2.5 s, ∼400 ms, 11 ms, 1.5 ms, and <25 &mgr;s. Studies of the system suggest that we can determine response times down to about 10 &mgr;s.
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