The K100/DFG
Phase Adjustable, Dual-Channel
Frequency Generator
Front View
Back View
Time-average holograms of vibrating objects have
fringes that follow a zero-order Bessel function of the first kind. There are basically two ways to convert such
fringes into numerical data, and both involve applying a bias vibration to a
piezo-electric mirror in either the reference beam or the object beam of the
recorded hologram at the same frequency as the object vibration. Also, in either case, the phase of the bias
vibration must be adjusted relative to the vibration of the object. It is necessary, therefore to be able to
generate two phase-locked sinewave signals and adjust their relative
phase. It is also necessary to be able
to adjust the frequency, amplitude, and phase of these signals smoothly and rapidly
without time-consuming re-initialization.
Karl Stetson Associates, LLC makes available the low cost K100/DFG
phase-adjustable, dual-channel signal generator for this purpose. It communicates with the host computer via a
USB port, and provides two outputs via BNC connectors, and it is powered by a 6
volt DC source. This unit makes use of
the Analog Devices AD9958 generator chip for which operating software is available
either from KSA or from Analog Devices.
The HoloFringe300K program is set up to use this generator as an
integral part of the Time Average Data routine for quantitative vibration
analysis.
Specifications:
Output Voltage: 0
to 0.5 volts
Voltage Resolution: 0.001
volts
Freq. Resolution:0.1
Hz
Power:6.0
volts
Input Connector:USB
cable
Output Connector:BNC
cable
Height:53 mm
(2 inches)
Width:152
mm (6 inches)
Length:180 mm
(7 inches)