Optical oxygen concentration measurement method and optical oxygen concentration measuring sensor
First Claim
1. An optical oxygen concentration measurement method, comprising:
- using a combination of a light-emitting layer for receiving excitation light and emitting light, and a light-absorbing layer whose light absorption spectrum varies depending on the degree of bonding with oxygen molecules, which varies in accordance with the oxygen concentration; and
measuring the oxygen concentration by detecting the light intensity of output light that varies based on the partial absorption of light emitted by the light-emitting layer or incident light for initiating light emission in the light-emitting layer during passage through the light-absorbing layer.
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Abstract
The present invention provides an optical oxygen concentration measurement method and optical oxygen concentration measuring sensor wherein a light-absorbing dye-molecule layer whose absorption spectrum varies depending on the bonding with oxygen molecules is combined with a light-emitting layer, and the oxygen concentration of the ambient fluid can be measured. The light-absorbing layer 4 laminated to an oxygen-quenching light-emitting layer 3 is a film comprising a cobalt-porphyrin complex (CoP) or other light-absorbing dye molecule 7 whose absorption spectrum varies depending on the bonding with oxygen molecules. When the degree of overlap with the light emission spectrum or excitation (absorption) spectrum of the light-emitting layer 3 varies as a result of a variation in the absorption spectrum possessed by the light-absorbing layer 4, the light intensity of output light varies in accordance with the degree of overlap, and the oxygen concentration of the ambient fluid can be measured. These measurement method and measuring sensor can be applied not only to optical fiber sensors, but also to wind tunnel experiments and the like as pressure-sensitive paints.
24 Citations
12 Claims
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1. An optical oxygen concentration measurement method, comprising:
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using a combination of a light-emitting layer for receiving excitation light and emitting light, and a light-absorbing layer whose light absorption spectrum varies depending on the degree of bonding with oxygen molecules, which varies in accordance with the oxygen concentration; and
measuring the oxygen concentration by detecting the light intensity of output light that varies based on the partial absorption of light emitted by the light-emitting layer or incident light for initiating light emission in the light-emitting layer during passage through the light-absorbing layer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An optical oxygen concentration measuring sensor, comprising:
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a light-emitting layer for receiving excitation light and emitting light; and
a light-absorbing layer whose light absorption spectrum varies depending on the degree of bonding with oxygen molecules, which itself varies in accordance with the oxygen concentration, wherein variations are created in the light intensity of output light on the basis of partial absorption when light emitted by the light-emitting layer, or incident light for initiating light emission in the light-emitting layer, passes through the light-absorbing layer. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification