Abstract
A pressure-sensitive paint (PSP) with fast response characteristics that can be sprayed on a test article is studied. This PSP consists of a polymer for spraying and a porous particle for providing the fast response. We controlled the polymer content (%) from 10 to 90% to study its effects on PSP characteristics: the signal level, pressure sensitivity, temperature dependency, and time response. The signal level and temperature dependency shows a peak in the polymer content around 50 to 70%. The pressure sensitivity was fairly constant in the range between 0.8 and 0.9 %/kPa. The time response is improved by lowering the polymer content. The variation of the time response is shown to be on the order of milliseconds to ten seconds. A weight coefficient is introduced to optimize the resultant PSPs. By setting the weight coefficient, we can optimize the PSP for sensing purposes.
Highlights
Pressure-sensitive paint (PSP) has been widely used in aerospace applications [1]
We have introduced a pressure-sensitive paint (PSP) with fast response characteristics that can be sprayed
This PSP consists of a polymer for spraying and a porous particle for fast response
Summary
Pressure-sensitive paint (PSP) has been widely used in aerospace applications [1]. It uses a photophysical process of oxygen quenching to relate an oxygen pressure of a testing fluid to a Sensors 2011, 11 luminescent signal. The supporting matrix greatly influences the response time of a PSP [2] The former uses a polymer as a supporting matrix. Gaseous oxygen needs to permeate into this layer to cause the oxygen quenching This limits the time response of this type of PSP on the order of seconds or sub-seconds. The latter uses a porous material as a supporting matrix
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