A Streak Camera Technique To Measure Plastic Plate Velocities As A Continuum

Dennis L. Paisley

doi:10.1117/12.955227

14 September 1977 A Streak Camera Technique To Measure Plastic Plate Velocities As A Continuum

Dennis L. Paisley

Proceedings Volume 0097, 12th Intl Congress on High Speed Photography; (1977) https://doi.org/10.1117/12.955227
Event: 12th International Congress on High Speed Photography, 1976, Toronto, Canada

Abstract

A technique was developed to measure velocities of thin plastic plates as a continuum with a streak camera at 20 mm/psec and 8.4X magnification. The plastic plates are bonded to an exploding foil with a transparent cylindrical barrel located over the exploding foil/plastic plate laminate on the side of the plastic plate. When the foil is exploded, a plastic plate is torn from the laminate and accelerated through the barrel. The velocity, acceleration, and displacement of 76-μm thick plastic plates moving through a 1 mm diameter barrel 1.5 mm long is recorded on the streak camera. Velocities to 4 mm/psec have been recorded. The actual streak record of the flying plates is recorded when the slit of the streak camera is parallel to the axis of the barrel cylinder. The barrel is backlight-ed with an exploding wire synchronized to function with the event under test. This method provides a shadowgraph record of the flying plate. The streak camera records the advancement of the plate through the barrel which is analogous to the plate velocity. The instantaneous velocity at that particular point is determined by: V = Ws/ (m tan 0) where V = velocity in mm/psec, Ws = writing speed in mm/psec, m = optical magnification, and 0 = angle between the camera slit and the tangent line at the point of interest on the streak record. The most reliable data will be recorded when 0 is near 45°. It is, therefore, desirable to choose Ws and m for a predicted velocity to generate a 0 near 45° and still meet any other requirements of the experiment.

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Dennis L. Paisley "A Streak Camera Technique To Measure Plastic Plate Velocities As A Continuum", Proc. SPIE 0097, 12th Intl Congress on High Speed Photography, (14 September 1977); https://doi.org/10.1117/12.955227

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KEYWORDS

Streak cameras

Velocity measurements

Explosives

Polymethylmethacrylate

Copper

High speed photography

Cameras

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