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High Precision Digital Imager

This study uses stereo digital image correlation (DIC) to investigate the response of a jointed beam under aerodynamic loading in a shock tube. Methods: The incident shock subjects the beam to an impulsive frontal load followed by periodic transverse loading from vortex shedding. Several considerations necessary to realize high-precision are addressed: first, a hybrid stereo camera calibration accounted for tangential distortions when imaging through thick windows. Second, a measurement bias from Xenon flash-lamp light sources was identified and removed using laser illumination. Third, facility motion was mitigated by vibration isolation and appropriate signal filtering. Finally, aero-optical distortions from turbulence were removed using a low-order reconstruction.

Results: The resulting displacement data has a noise floor of approximately ± 1 μm at 20 kHz sampling rate. The reduction of primary noise sources allows a transient structural response on the order of 10–40 μm to be quantified. The highest vibrations occurred when the vortex shedding frequency matched the beam’s natural frequency.

Conclusion: the noise reduction techniques described allow for structural measurements requiring high-precision, non-intrusive displacement data to be performed in aerodynamic environments.

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Specifications

Max. Screen Size:

Cusstomized

>1200*1200mm-3600*4000mm

Thickness of Frame:

20-60mm

Imaging System Technology:

DLP

Laser Power:

10W,15W,20W

Laser Type:

UV Laser

Focus System:

Real Time Focus Control

Image Resolution:

508/1016/1270/2032/2540 dpi

Data Resolution:

10160 dpi

Thickness of Emulsion:

2-150 nanometer

File Format:

1 bit BMP/TIFF

Exposing Time:

20m2/h

Interface:

Gigabyte Ethernet Adapter

Dimesion:

Based on Max. Screen Size

Net Weight:

2000kg

Working Conditons:

Teperature:15 degree centrigrade

Humidity; 40-60%

Power:

2.0KW/220V, 50/60Hz

Compressed Air:

0.4 Mpa- 0.6Mpa