Dr. Darryl Bornhop developed the basic detection technique that forms the basis of our design. The papers and patients of Dr. Bornhop showed that using optical lasers to refract light when striking a capillary tube produced fringed patterns. The fringe patterns were proven to move in one axis when the refractive index of the fluid within the capillary changes. A device to create a non-invasive flow meter dependent on temperature change was developed and tested by the group. The temperature change was created using a wire coil heater with approximately 4 amps of current passing through. The coil is wrapped around a 0.25 inch ID glass tube. Two optical lasers placed on either side of the coil heater are used to create fringe patterns that are detected by two photo resistors. The photo resistors detect the asymmetry heating of the fluid in the glass tube. The differences due to the asymmetry will be correlated to the flow rate of the liquid. All hardware is rigid mounted to prevent mechanical noise.
optical detection technique, flow meter
Northeastern University, Department of Mechanical, Industrial and Manufacturing Engineering
Egnaczyk, Matthew; Poles, Dante; Saylor, Thomas; and Tam, Jonathan, "Non-invasive, Nano-liter Scale Flow Meter" (2007). Capstone Design Program: Mechanical Engineering. Paper 81. http://hdl.handle.net/2047/d10011602
Click button above to open, or right-click to save.COinS