In order to study the measurement technique of high power electromagnetic pulse,standard gain horn and wideband digital oscilloscope are adopted to measure the electromagnetic pulse waveform.

:In the paper, we systematically research the spectrum character of Stimulated Raman Scattering in the birefringence optical-fiber and give server-order stokes and one-order anti-stokes spectrum, then measure the stokes threshold x spectrum width and Raman gain.

The acoustic sources comprise an electronic sine wave generator or a loud speaker and a pneumatic diaphragm horn,by varying the frequency generated,sound pressure,air-to-cloth ratio and the filtering medium,the results have been achieved for reverse-air alone and reverse-air/sonic cleaning.

Based on this analysis,a detailed discussion is presented for the fields of the corrugated horn and the corrugated horn under the balance condition in terms of the Gaussian mode theory,the Gaussian mode parameters for the corrugated horn are also determined.