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The MicroV©
A MEMS Based Versatile Velocity Sensor
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product brochure
The MicroV©
is a non-intrusive, time-of-flight velocity sensor, capable
of measuring velocity of the flow or moving objects at a fixed distance
from the sensor surface. The sensor is extremely compact and has no
moving parts. The sensor does not include any active components and is
suitable for use in harsh environments. The figure below shows the
Micro V designed as a sealed surface mounted sensor along with a
schematic of the sensor.

Photograph of the MicroV with a schematic of the sensor.
The sensor uses diffractive
optic elements to project two elongated light spots (approximately 75 um
long and 20 um apart). The light scattered by particles in the flow or
by a moving surface is collected through the same sensor element. In
addition to the packaging shown above, the sensor is available as a
stand-alone or OEM version, shown below.

OEM Version of the MicroV.
The light source and the
electronics are connected to the sensor via optical fibers. Optical
steel jacketed conduits are available for industrial applications.

MicroV and opto-electronics driver.
Processing
As particles travel through the
optical probe volume composed of two parallel light sheets, see Figure
below, they generate two scattered light intensity peaks. The processor,
developed in LabView, uses an autocorrelation-based algorithm to
determine time elapsed between the two peaks, t, as shown in the figure
below. The time t is inversely proportional to the particle velocity.
VioSense provides a PC-based signal processor developed in LabView
providing an intuitive graphical user interface.

Instantaneous boundary layer characterization
Currently in the development
phase, the microsensor shown in the schematic below will be used for
instantaneous boundary layer characterization and shear stress
measurement.

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