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Interfacing the Blast Pressure TransducerLooking at the dimensions of the pencil probe in Figure 6 relative to the preceding value of ?, it is clear that the probe has the potential to act as a reflecting body to high frequencies in the approaching shock front.In order to minimize reflections, the probe is tapered over approximately its first two-inches of length. It then transitions into a cylindrical body with a flat surface on one side. This flat surface eliminates discontinuities between an embedded, discshaped, radial facing, quartz sensing element and the transducer housing. Ideally, the velocity of the shock front and the spatial averaging of the disc as the front traverses across it will control the measured rise time. The averaging effect associated thermostat with any pressure transducer can be envisioned as the distortion that a sine wave would encounter as it passes at right angles to the axis of symmetry that is perpendicular to the plane of the circular diaphragm of the transducer. The diaphragm would cause distortion through spatial averaging of the wave, which results in attenuation. Analysis of the spatial averaging effect of the diaphragm of pressure transducers has been performed.1 Results are shown in Figure 7. When using these results, the velocity (in/second) of the gas passing over the transducer must be applied as a multiplier to the abscissa (x-axis) to convert its units to Hz. As an example of the application of Figure 7, at 1100 ft/sec (13,200 in/sec) in dry air, a 0.3-in. diameter diaphragm would nominally produce a five-percent amplitude error at 9,200 Hz, and a 0.1-in. diameter diaphragm would produce the same error at 24,000 Hz.
Not that I''ve got it all figured out. Please! My time''s spread awfully thin. I''m a husband and the father of three growing kids, my job keeps me busy 50-60 hours a week, I write books and speak about leadership all over the country, I train for and compete in triathlons, and I''m deeply involved in my local church. Sometimes I hit the wall and stumble. But precisely because my life''s so frenetic, I''ve come up with some time-stretching strategies that may help you, too.
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thermostat kits
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