Citation:
Liron Stern, Bakal, Avraham , Tzur, Mor , Veinguer, Maya , Mazurski, Noa , Cohen, Nadav , and Levy, Uriel . 2014. “Doppler-Based Flow Rate Sensing In Microfluidic Channels”. Sensors, 14, 9, Pp. 16799–16807. doi:10.3390/s140916799.
Abstract:
We design, fabricate and experimentally demonstrate a novel generic method to detect flow rates and precise changes of flow velocity in microfluidic devices. Using our method we can measure flow rates of \~2 mm/s with a resolution of 0.08 mm/s. The operation principle is based on the Doppler shifting of light diffracted from a self-generated periodic array of bubbles within the channel and using self-heterodyne detection to analyze the diffracted light. As such, the device is appealing for variety of “lab on chip” bio-applications where a simple and accurate speed measurement is needed, e.g., for flow-cytometry and cell sorting.