helium- counter

基本解釋

MINIMAM UTILITIES: Air-cooled small X-ray tube and gas filled proportional counter have been employed, and the only requirements are AC Power Source and Helium Gas.
使用簡單：儀器內(nèi)置氣體密封型比例計數(shù)管，只要接上電源和氦氣（保護），就可以正常使用儀器。
Lasers became an everyday technology when US supermarkets decided to automate their checkouts using barcodes that could be read by a red helium-neon laser built into the counter.
激光技術(shù)第一次走進日常生活，是美國超市使用發(fā)出紅色氦氖激光的條形碼掃描槍實現(xiàn)收款自動化。