Patent ID: 8237930
Filing Date: 2012-08-07
Classification: G01N

Abstract:
1. An oxygen sensor using a principle of surface plasmon resonance, comprising: a laser diode that emits light; a polarizer that converts light emitted from the laser diode into polarized light; a prism that receives the polarized light from the polarizer and that has a sensor substrate provided on one surface thereof to reflect the polarized light, the sensor substrate being coated with an oxygen-sensitive organic material; an oxygen concentration measurement chamber that encloses the sensor substrate wherein oxygen a concentration of which is to be measured is contained therein; a photodiode that measures an amount of light reflected from the prism; and a microcontroller unit that controls operation of the oxygen sensor and that calculates 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.