Dissolved Oxygen Sensing Using an Optical Fiber Long Period Grating Coated With Hemoglobin

A long period grating fiber optic sensor coated with hemoglobin is used to detect dissolved oxygen. The sensitivity of this sensor to the ratio of dissolved carbon dioxide to dissolved oxygen is demonstrated via the conversion of carboxyhemoglobin to oxyhemoglobin on the sensor surface. The sensor shows good repeatability with a%CV of less than 1% for carboxyhemoglobin and oxyhemoglobin states with no measurable drift or hysteresis.