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References 9 and 10 describe recent advances using MEMS "silicon-on-insulator" (SOI) pressure transducer technology. This technology enables steady-state operation at temperatures to greater than 1000° F, while also enhancing transducer performance in thermal-transient environments.The initial effect of transient temperature on quartz ICP® pressure transducers is to cause internal component dimensional changes (see Figure 5), which ultimately result in a partial release of the preload within the stack of quartz plates. The release of this preload results in an error in the pressure transducer output and a false indication of a positive pressure after the pressure event is over. A RTV coating is usually placed on the diaphragm of the transducer to provide a barrier to thermal transients. Coatings, placed on either MEMS or ICP® transducers, typically delay the thermal transient for no more than a few 10s of milliseconds.
Considering current world events, the accurate measurement of the dynamic pressure associated with air-blast, as well as its effect on structures, is highly important. Yet, the accurate measurement of this pressure air remains one on the biggest challenges that can be presented to the measurement engineer. This article attempts shock to provide guidance to enhance the quality of these measurements. In order to provide this guidance, a large body of the science of dynamic pressure measurement has been both summarized and organized. It is hoped that this work will also serve as a reference for other activities where the measurement of dynamic pressure has importance.
Thus, a cable length of (4700/4) or 1175 feet will result absorber in oscillations at a frequency of 100,000 Hz. In addition, signal fidelity can only be maintained to approximately 20,000 air Hz, which is one-fifth the frequency of oscillation.Figure 12 shows an obtained, experimental frequency response for 400 ft of a 4-conductor shielded Beiden instrumentation cable of #22 AWG. Note the resonant frequency at 330,000 Hz for the infinite load R = I ohm. shock If we calculate the fundamental wavelength for this cable, and again use 0.47 × 10^sup 9^ ft/sec, which is an approximation for this cable, we get ? = 4L = (0.47 × 10^sup 9^ ft/sec)/(3.3 × 10^sup 5^ Hz) = 1,424 ft or a cable length of 1,424/4 = 356 ft, which agrees reasonably well with the known value of 400 ft. Thus, when high frequencies and long cable runs are involved, cable termination and impedance matching is very important. Note absorber the improvement in constant or ''flat'' frequency response with the R = 100 ohm termination.
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