光声效应是指样品吸收强度调制的光而激发起声波的效应,由Bell于1880年发现。如图1.1所示,入射光照射装有气体样品的密闭光声池,如果光的波长与气体的吸收线一致,则气体分子吸收光子而处于激发态。分子间的相互碰撞使一部分受激分子通过无辐射跃迁过程而返回基态,激发能弛豫为平动能。宏观上表现为池内气压的增大。若...
0225946N/A1880-03-30Reece417/529 Primary Examiner: BERTHEAUD, PETER JOHN Attorney, Agent or Firm: RAYMOND F. PASQUAN (ETOBICOKE, ONTARIO, CA) Claims: I claim: 1.A liquid well pumping arrangement comprising: a pair of adjacent downhole reciprocating pumps each having a barrel, a piston rod...