Development of SH Wave Generator for Seismic Sounding by High Pressure Gas Method

地震测深用SH波发生器最初研制于1988财年，以高压气体为能源。该测试发生器于1988财年试制，并进行了性能测试，检查了其安全运行情况和1990财年产生地震波场的潜在功率。测试结果表明：1.测试仪器运行安全，可重复产生波场。测试发生器有效辐射SH波，无噪声。测试发电机发射宽频带的SH波。测试发电机发射尖锐的SH波。测试发电机发射的SH波精确可重复，幅度由气体压力控制。测试发生器辐射的SH波的幅度大约是木板发电机的两倍，所有这些结果都使我们能够判断测试发生器的测试阶段，并继续开发实用的发生器。

SH wave generator for seismic sounding has been originally developed in FY1988, which uses high pressure gas as energy source. The test generator was made in FY1988 and its performance tests have been done checking its safety operations and its potential power to generate seismic wave field through FY1990. The efficiencies of the test generator are summarized as follows :1. Test generator operates safety and it can generate wave field repeatedly.2. Test generator effectively radiates SH waves without noisy sound.3. Test generator radiates SH waves of wide frequency band.4. Test generator radiates SH waves with sharp onset.5. Test generator radiates SH waves precisely repeatable with amplitude controlled by the gas pressure.6. Test generator radiates SH waves with about twice larger amplitude than those by the wooden plate generator.All these results lead us to judge finalizing the testing stage of the test generator and to move on to develop the generator for the practical uses.