FHWA NDE CENTER RESEARCH & DEVELOPMENT
Laser System
The Federal Highway Administration (FHWA) Nondestructive Evaluation (NDE) Center laser system was developed through the FHWA research
program to be a tool to aid in the global measurement of bridges or other structural objects. The system can measure distances to
multiple points on an object without requiring special surface preparation of the object. This instrument can be used to measure
the surface profile or movement of large structures.
In order to make a distance measurement the system sends a laser signal from the instrument to an object. This signal
reflects off the object and is returned back to the instrument again. A highly reflective object is not necessary in order to
make a valid distance measurement. Typical structural materials, such as steel (both painted and unpainted) and concrete,
produce good results. Frequency modulation of the laser is used to increase resolution and improve the immunity to surface
conditions and ambient light. A mechanical scanner is incorporated to direct the laser to multiple measurement points from a
single instrument scanner location. The laser system is capable of sub-millimeter measurements over a maximum range of
about 30 m. This instrument differs from other remote distance measurement devices in that it can resolve sub-millimeter
measurements without requiring a special target.
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Left: The Laser System Scanner
Below: The Laser System Computer |
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Applications of the FHWA NDE Center Laser System:
For more information, please contact either by e-mail or telephone.
Frank Jalinoos (202) 493-3082
frank.jalinoos@fhwa.dot.gov
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