Spring 2012
Laboratory #5: Unsteady Velocity Measurements in a Jet Using a Laser Doppler Velocimeter
A formal report is required for this laboratory. Please follow the instructions for formal report formats carefully, and include the items listing in the Additional Instructions.
Additional Instructions AND Information
While taking your basic data (step 21 in the procedure), you are encouraged to
take repeated measurements at a few selected locations if you would like to get
more information to help determine the uncertainty of your measurements.
After you are done acquiring axial velocity data, rotate the transceiver by 90
degrees and attempt to acquire vertical velocity component data (at least)
somewhere in the shear layer of the jet. Note, you will need to adjust the Bandpass Filter and Downmix
settings to account for the fact that: 1) the vertical velocities are less than
the axial velocities and 2) the vertical velocity can be both upward and
downward.
In preparing your "Error Analysis" section, you may assume
that the beam spacing accuracy is +/- 0.25 mm and the lens focal length
accuracy is +/- 1 mm. ALSO REMEMBER to include error bars where appropriate in
your data plots.
Questions
Please include answers to the following questions in the
appropriate section
in your report: