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 VIDEOS

Measuring Flow Rate with Fluorescence

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      A Stopwatch for Nanofluids: NIST Files Provisional Patent Application for Measuring Nanoliter Flow RatesFlow and Pressure
      
            Flowing down a microchannel is a fluid filled with fluorescent molecules that emit green light when exposed to a specific wavelength of blue light. However, these molecules have been chemically modified to prevent fluorescence. At one point in the channel, an ultraviolet laser destroys the chemical modification of some of the molecules. At another point in the channel, a blue laser causes these bare molecules to fluoresce. Researchers determine flow rate by measuring the elapsed time between removing the chemical modification and fluorescence . Credit: Sean Kelley/NIST

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                                January 16, 2018
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