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The test requirements presented significant challenges, because existing technology was unavailable prior to 4D’s development of the SpeckleCam, a speckle interferometer insensitive to vibration. Test conditions involved acquiring measurement data rapidly in a high-vibration environment on nonreflective and diffuse surface structures. Additionally, meter-class structures needed to be measured from a distance of tens of meters in a cryogenic chamber. To accomplish this, 4D combined its pixilated phase-sensor technology with a high-energy pulsed laser. The high acquisition speed of the device makes it insensitive to vibration and air turbulence.
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