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Instrumentation for the Measurement of Underwater Explosion Pressures

出版	David Taylor Model Basin
URL	http://books.google.com.hk/books?id=BysuywEACAAJ&hl=&source=gbs_api

註釋The David Taylor Model Basin, in its efforts to provide instruments for the measurement of underwater explosion pressures, has developed three pressure gages, two of the piezoelectric and one of the resistance type. The construction and operation of the gages are described in detail. The most important causes of distortion of a gage signal are analyzed and the measures taken to overcome them are described. In particular the mechanical disturbance of a gage cable by an underwater explosion gives rise to a spurious signal which is large when ordinary coaxial cables are used. An investigation of this effect has resulted in the development of a coaxial cable which has many advantages over any other type that was investigated, and which permits accurate measurements of momentum. Several techniques for calibrating the various gages are discussed. The best of these methods gives results which agree closely with those obtained by workers in other laboratories. The gages were subjected to explosion tests with charges of about one ounce of tetryl, in which pressure-time records were obtained. Only the tourmaline gage has been tested with larger charges, of 100 grams or more. These tests yield records which exhibit a high degree of reproducibility.