Deflection evaluation using time-resolved radiography

David A. Fry; Jacob P. Lucero

doi:10.1117/12.23355

1 January 1991 Deflection evaluation using time-resolved radiography

David A. Fry, Jacob P. Lucero

Proceedings Volume 1346, Ultrahigh- and High-Speed Photography, Videography, Photonics, and Velocimetry '90; (1991) https://doi.org/10.1117/12.23355
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

Abstract

Time-resolved radiography is the creation of an x-ray image for which both the start-exposure and stop-exposure times are known with respect to the event under study. The combination of image and timing are used to derive information about the event. We have applied time-resolved radiography to evaluate motions of explosive-driven events. In the particular application discussed here our intent is to measure maximum deflections of the components involved. Exposures are made during the time just before to just after the event of interest occurs. A smear or blur of motion out to its furthest extent is recorded on the image. Comparision of the dynamic images with static images allows deflection measurements to be made. 1. TIME-RESOLVED RADIOGRAPHY The concept of time-resolved radiography (TRR) is outlined in the following steps. a) The subject is continuously irradiated with x-rays to form an image on a suitably fast phosphor screen placed behind the subject. (The continuous xray source actually needs only to be stably on during the exposure period. ) b) The phosphor screen is viewed by a gated camera. c) A trigger signal is available to indicate the start of the event. d) The camera gate is opened for a selected duration exposure after a selected delay following the trigger. The basic idea is to acquire an image over a selected period of time known with respect to the event of interest. 1.

Citation Download Citation

David A. Fry and Jacob P. Lucero "Deflection evaluation using time-resolved radiography", Proc. SPIE 1346, Ultrahigh- and High-Speed Photography, Videography, Photonics, and Velocimetry '90, (1 January 1991); https://doi.org/10.1117/12.23355

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