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The Chance Discovery That Led to an Affordable Flow Sensor

Dr. Marcus HultmarkFounder, Tendo Technologies and Associate Professor,Department of Mechanical and Aerospace EngineeringPrinceton University
AZoSensors speaks with Dr. Marcus Hultmark, an associate professor in the Department of Mechanical and Aerospace Engineering at Princeton University. Marcus led a team that found a revolutionary new approach to measuring flow rates.
What makes the EFV sensor different from other available flow sensors?
The way EFV measures the flow is different from other sensors. Instead of relying on thermal effects or pressure, which are the most common methods, it relies on viscous forces. It measures these viscous forces through a sensing element that looks much like a typical strain gage, but without being mounted on a membrane. ....

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A Chance Discovery Could Reduce the Cost of Expensive Fluid Flow Sensors

Image Credit: Princeton University
What started as a happy accident and an odd measurement could lead to a new, cost-effective way of measuring fluid flow.
Often the course of science doesn’t run smooth and happy accidents can lead to major findings and discoveries. From Michelson and Morley’s failure to detect the ether a mysterious substance through which light was thought to propagate arose Einstein’s theory of special relativity, for example. That’s a lesson that researchers at Princeton University also recently learned.
When they set about to test a high-resolution temperature sensor in water, Marcus Hultmark and three Ph.D. students discovered something remarkable. The sensor initially appeared to be displaying some weird ‘back to front’ readings. ....

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Revolutionary, dirt-cheap sensors will replace $10,000 instruments

Sharon Waters for the Office of Engineering Communications
Jan. 29, 2021 2:30 p.m.
It started as a failed experiment.
Princeton Professor Marcus Hultmark and three Ph.D. students in his lab were testing in water a high-resolution temperature sensor that they had developed and used successfully for measurements in air. But then-graduate student Clayton Byers saw that the sensor was delivering backwards results: warm registered as cold and vice versa. Disappointment led to discovery as the team realized they were measuring fluid velocity, which has long proven much more difficult to measure than temperature.
Marcus Hultmark led a team that found a revolutionary new approach to measuring flow rates. “You can put it in honey, in water, in air, and the same sensor does a very good job in all of them,” he said. ....

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