Abstract
The theoretical optimum ballast resistance for maximum response of a film gage circuit is derived. This resistance leads to a much higher gage voltage than is ordinarily used. Provided platinum leads are used, so that bimetallic mismatch and the consequent burnout is eliminated, the response of the gage is limited only by the increase of its resistance with temperature. Such a gage is capable of producing shock arrival time, thickness, and structure data over the entire operating range of a low-pressure shock tube without amplification external to the oscilloscope. Adequate unamplified response has been demonstrated down to 3 × 10−4 Torr (a factor of 100 better than was obtainable by the piezoceramic gages previously in use). Order of magnitude improvements in spatial and temporal resolution over previous gages have also been made.
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