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Custom Installation for the U.S. Navy:
MiniLDV© employed for tests at the Large Cavitation
Channel, Carderock Division.
We adapted our miniature laser Doppler anemometer
for remote measurement of the velocity profile on a hydrofoil system.
Shown here, the probe contained the light source, miniature optics, frequency
shifting, receiving optics and the detection system.
In our present design, the diode laser did not require temperature stabilization. This
portable device worked in backscatter mode with a probe volume distance
of 30 mm (in air). The sensor included frequency-shifting capability and
the frequency shift was set at 1.13 MHz. The overall dimension of the
sensor head was 3.5 cm in diameter and 10 cm in length. Except for
frequency shifting mechanism, it had no moving parts and required no
on-site alignment or calibration.
The MLDA sensor head was attached to a traversing mechanism and the
entire assembly was placed in a sealed housing. The sealed housing was
waterproof conforming to IP68 standards. The entire housing was
installed inside the hydrofoil, with the window flush mounted with the
surface. The images below show the MLDA housing after
installation in the hydrofoil. The view is from the pressure side of the
hydrofoil. The feed through connectors for the electrical and optical
cables are visible.
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