Optical EngineeringDigital drum camera for dynamic recording
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Currently, digital imaging and hard copy techniques are extensively used in photomechanics research. However, the slow speed of popular video systems limits their use in dynamic photomechanics. New devices and sensors are being introduced to meet the high-speed requirements in dynamic applications. We report the applications of a lowcost, high-speed time delay and integration (TDI) camera in some of the dynamic photomechanics experiments. TDI is a special operating mode built on the traditional full-frame imager architecture. In this mode, the charge-coupled device (CCD) camera functions similarly to a drum camera. The high sensitivity of the CCD enables the use of low-cost, lowpower semiconductor light sources. After a brief description and comparison of TDI operation with conventional recording schemes, two applications are demonstrated. First, dynamic photoelasticity experiments using streak and strobe recording are exemplified. In the second demonstration, imaging and inspection of curved objects rotating at high speeds are presented.