OXYGEN SENSOR USING PRINCIPLE OF SURFACE PLASMON RESONANCE AND OXYGEN TRANSMISSION RATE MEASUREMENT SYSTEM INCLUDING THE SAME
First Claim
1. An oxygen sensor using a principle of surface plasmon resonance, comprising:
- a laser diode for emitting light;
a polarizer for converting light emitted from the laser diode into polarized light;
a prism for receiving the polarized light from the polarizer and having a sensor substrate provided on one surface thereof so that the polarized light is reflected, the sensor substrate being coated with an oxygen-sensitive organic material;
an oxygen concentration measurement chamber provided to enclose the sensor substrate so that oxygen a concentration of which is to be measured is contained therein;
a photodiode for measuring an amount of light reflected from the prism; and
a microcontroller unit for controlling operation of the oxygen sensor and calculating the concentration of oxygen,wherein the concentration of oxygen is determined using the microcontroller unit having values of absolute concentration corresponding to the amount of light measured using the photodiode, andthe concentration of oxygen is measured in a state in which an incidence angle of the polarized light incident on the sensor substrate is fixed.
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Abstract
An oxygen sensor using the principle of surface plasmon resonance, capable of measuring an oxygen concentration in a measurement chamber by detecting a change in resonance angle or refractive index using field enhancement effects, is provided. An oxygen transmission rate measurement system including the oxygen sensor is also provided. In this invention, only a change in voltage is measured at a fixed angle, thus achieving rapid measurement, and also, a single wavelength light source is used, thus reducing the size of the oxygen sensor and oxygen transmission rate measurement system. The oxygen sensor includes a laser diode for emitting light, a polarizer for converting the emitted light into polarized light, a prism for receiving the polarized light from the polarizer and having a sensor substrate provided on one surface thereof so that the polarized light is reflected, an oxygen concentration measurement chamber provided to enclose the sensor substrate so that oxygen a concentration of which is to be measured is contained therein, a photodiode for measuring the amount of light reflected from the prism, and a microcontroller unit for controlling operation of the oxygen sensor and calculating the oxygen concentration.
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Citations
35 Claims
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1. An oxygen sensor using a principle of surface plasmon resonance, comprising:
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a laser diode for emitting light; a polarizer for converting light emitted from the laser diode into polarized light; a prism for receiving the polarized light from the polarizer and having a sensor substrate provided on one surface thereof so that the polarized light is reflected, the sensor substrate being coated with an oxygen-sensitive organic material; an oxygen concentration measurement chamber provided to enclose the sensor substrate so that oxygen a concentration of which is to be measured is contained therein; a photodiode for measuring an amount of light reflected from the prism; and a microcontroller unit for controlling operation of the oxygen sensor and calculating the concentration of oxygen, wherein the concentration of oxygen is determined using the microcontroller unit having values of absolute concentration corresponding to the amount of light measured using the photodiode, and the concentration of oxygen is measured in a state in which an incidence angle of the polarized light incident on the sensor substrate is fixed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 23, 24, 25, 26)
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11. An oxygen transmission rate measurement system comprising an oxygen sensor using a principle of surface plasmon resonance, the oxygen transmission rate measurement system comprising:
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the oxygen sensor, including; a laser diode for emitting light, a polarizer for converting light emitted from the laser diode into polarized light, a prism for receiving the polarized light from the polarizer and having a sensor substrate provided on one surface thereof so that the polarized light is reflected, the sensor substrate being coated with an oxygen-sensitive organic material, an oxygen concentration measurement chamber provided to enclose the sensor substrate so that oxygen a concentration of which is to be measured is contained therein, a photodiode for measuring an amount of light reflected from the prism, and a microcontroller unit for controlling operation of the oxygen sensor and calculating an oxygen concentration change and an oxygen transmission rate; and an oxygen supplier connected to one side of the oxygen sensor to supply oxygen gas, wherein the oxygen transmission rate is measured by determining the oxygen concentration change from the amount of the light measured using the photodiode at predetermined temporal intervals. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification