Dual-mode optofluidic flow rate sensor

Yuan Gong; Liming Qiu; Chenlin Zhang; Yu Wu; Yun-Jiang Rao; Gang-Ding Peng

doi:10.1117/12.2264101

23 April 2017 Dual-mode optofluidic flow rate sensor

Yuan Gong, Liming Qiu, Chenlin Zhang, Yu Wu, Yun-Jiang Rao, Gang-Ding Peng

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103236W (2017) https://doi.org/10.1117/12.2264101
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

A dual-mode optofluidic flow rate sensor with a large dynamic range of 4 orders of magnitude is developed. The sensing mechanism is based on the force balance on an optically trapped polystyrene microparticle. As the optical force is very small, the flow rate sensor is very sensitive. In the open-loop mode, the manipulation length is used as the sensing signal. The sensor has an inverse sensitivity, that is, the manipulation length decreases as the flow rate increases, so that it has high sensitivity at low flow rate. In the closed-loop mode, the manipulation length is set to be constant and a feedback signal to tune the laser power for force balance is used as the sensing signal. The closed-loop mode is helpful for extending the upper limit of flow rate and also enhancing the sensitivity at high flow rate.

Citation Download Citation

Yuan Gong, Liming Qiu, Chenlin Zhang, Yu Wu, Yun-Jiang Rao, and Gang-Ding Peng "Dual-mode optofluidic flow rate sensor", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103236W (23 April 2017); https://doi.org/10.1117/12.2264101

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