Browsing by Author "Kim, D. W."
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- In-Fiber Reflection Mode Interferometer Based on A Long-Period Grating For External Refractive-Index MeasurementKim, D. W.; Zhang, Y.; Cooper, K. L.; Wang, Anbo (Optical Society of America, 2005-04-01)We present two novel schemes for refractometry based on a long-period fiber grating- (LPG-) based Michelson interferometer. These schemes are designed to overcome the measurement dependence of previously demonstrated LPG-based refractometry on the immersion depth. The first utilizes an unshielded LPG and the second, a shielded one. Both schemes were tested over a certain refractive-index range, and the measurement of glucose concentration in water was experimentally demonstrated. In addition, the temperature sensitivity of the two schemes is discussed. (c) 2005 Optical Society of America.
- Self-Compensating Fiber Optic Flow Sensor System And Its Field ApplicationsPeng, W.; Pickrell, Gary R.; Huang, Z. Y.; Xu, J. C.; Kim, D. W.; Qi, B.; Wang, Anbo (Optical Society of America, 2004-07-01)A self-compensating fiber optic flow sensor system based on the principle of broadband white-light interferometers and cantilever beam bending is described. The fiber optic sensor system uses two fiber ferrule sensors that are bonded on either side of a cantilever beam to measure the flow rate by monitoring the air-gap changes caused by the bending of the cantilever beam. Cross sensitivity of the temperature and pressure dependence of the sensor can be compensated for automatically. The prototype sensor system was constructed, laboratory characterized, and field tested. The results from the field testing have demonstrated high resolution, repeatability, and stability for on-line detection of the flow rates of fluids. (C) 2004 Optical Society of America.