超高圧力を測定する一手法

抄録

We report the measurement of shock pressure which cannot be measured directly using a normal pressure transducer. We considered three types of shock absorber: steel, brass and Teflon, and we measured their transfer ratios using a shock tube. Results show that Teflon is the most effective shock absorber because the transfer ratio is very small. Our procedure is as follows: (1) unknown pressure is measured through the shock absorber (damped pressure); (2) the spectrum is calculated by fast Fourier transform (FFT); (3) the real pressure spectrum is reproduced using the transfer ratio; (4) the real pressure wave is reproduced by inverse FFT. We found that the reproduced pressure agrees well with the directly measured pressure. And as an example of a pressure which cannot be measured using a pressure transducer we measured the center pressure of a convergent detonation. From the measurement we estimate the pressure to be about 360 MPa.