Piezoelectric gauge

A published collection of selected reprints concerning piezoelectricity under shock loading and related piezoelectric gauges is available as a convenient source for work in the area of shock-compressed elastic piezoelectrics [78G02]. 

Methods of measuring underwater shock waves by crusher gauges, diaphragm gauges piezoelectric gauges are thoroughly described by Cole (Ref 3) in Chapter 7. Cook (Ref 7) describes the use of a 16- to 64-frame/sec camera to measure the free surface vel produced by a shock wave at the surface, and the determination of the underwater pressure-distance curve for TNT... 

Fig 17 Shock Front Pressures from Velocity Data Compared with Theory and Piezoelectric Gauge Measurements (Ref 1)... 

The metals were either packed in high-purity graphite and heated in an Ar atmosphere or heated in a pure-nitrogen atmosphere up to 2500 K in a cold-wall autoclave. The temperature was recorded by thermocouples or two-color IR pyrometers. Gas pressures (mbar range up to 40 bar) were measured with piezoelectric gauges. The conditions were recorded on a PC equipped with an A/D converter. Extended heating periods could be maintained without any change in experimental conditions. 

The tube is created with a squared cross section, 10 pm wide. The driver and driven section have equal lengths. The driver and driven sections are separated by a membrane, and the test section is prefilled with the test gas during fabrication. The top side of the tube is made of a plate comprising direct-sensing piezoelectric gauges, used for timing the arrival of pressure waves. 

Ignition of the reactive mixture was achieved by a hot wire located on the axis of symmetry at the closed end of the vessel (see Fig. 1). Location of the flame from the ignition point was recorded with ionization probes, and pressure variations in the chamber and in the tube were recorded with piezoelectric gauges. The number and location of the gauges depend on the length of Ae tube. A typical arrangement is displayed in Fig. 1. 

Flat layers of material under study of varying thickness, which fully close the section of the channel of the shock tube, were placed on the end wall of the research section (see location 1 in Fig. 1) where the pressure piezoelectric gauges were mounted. Piezoelectric gauges (see location 2) of two types were used in the experiments a) gauges developed at the Institute... 

The speed of the incident shock wave was measured with the help of piezoelectric pressure gauges situated in the lateral walls of the channel. In order to match the high output resistance of the piezoelectric gauges with the wave resistance of the long line, tension... 

---