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Foundation ::
Laser Applications ::
VPI
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VPI
Vibration Pattern Imager: a Control and Data Acquisition System for Scanning Laser Vibrometers
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Moderators:
Adopt This Application!
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SOURCE CODE AVAILABLE
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The Vibration Pattern Imager (VPI) system was designed to control and
acquire data from laser vibrometer sensors. The PC computer based system
uses a digital signal processing (DSP) board and an analog I/O board to
control the sensor and to process the data. The VPI system was originally
developed for use with the Ometron VPI Sensor (Ometron Limited, Kelvin
House, Worsley Bridge Road, London, SE26 5BX, England), but can be readily
adapted to any commercially available sensor which provides an analog output
signal and requires analog inputs for control of mirror positioning.
VPI's
graphical user interface allows the operation of the program to be
controlled interactively through keyboard and mouse-selected menu options.
The main menu controls all functions for setup, data acquisition, display,
file operations, and exiting the program.
Two types of data may be acquired with the VPI system: single point or "full
field". In the single point mode, time series data is sampled by the A/D
converter on the I/O board at a user-defined rate for the selected number of
samples. The position of the measuring point, adjusted by mirrors in the
sensor, is controlled via a mouse input. In the "full field" mode, the
measurement point is moved over a user-selected rectangular area with up to
256 positions in both x and y directions. The time series data is sampled by
the A/D converter on the I/O board and converted to a root-mean-square (rms)
value by the DSP board. The rms "full field" velocity distribution is then
uploaded for display and storage.
VPI carries the NASA case number LAR-14897. It was originally released as part of the NASA COSMIC collection.
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