We consider testing it using photon counting mode of photomultiplier pmt to transform light signals into electric signals . much of the noise can be eliminated with an amplitude discriminator 用光電倍增管( photomultiplierpmt )的光子計(jì)數(shù)模式將電致發(fā)光的光信號轉(zhuǎn)換為電信號來進(jìn)行測試。