公开(公告)号：US3784307A

公开(公告)日：1974-01-08

申请号：US3784307D

申请日：1970-11-16

Applicant: PHILIPS CORP

Inventor： JACKSON J ,  DONAT BRADSHAW R

IPC: G01J3/427 ,  G01J3/08 ,  G01J3/447 ,  G01N21/03 ,  G01N21/21 ,  G01N21/31 ,  G01N21/22

CPC classification number: G01N21/314 ,  G01N21/03 ,  G01N21/21

Abstract: A method and apparatus for monitoring the presence of water vapor in helium features providing two narrow infrared frequency band within and outside a water vapor absorption band, alternately projecting the two bands of infrared radiation into the helium by using the polarization properties of the infrared radiation, and subsequently detecting the two infrared bands and comparing their amplitudes. Besides providing an accurate and reliable measurement, the invention is compact and requires no moving mechanical parts.

Abstract translation: 一种用于监测氦特征中水蒸汽存在的方法和装置，其在水蒸汽吸收带内和外部提供两个窄红外频带，通过使用红外辐射的偏振特性将两个红外辐射带交替地投射到氦气中， 并随后检测两个红外波段并比较其幅度。 除了提供准确可靠的测量之外，本发明是紧凑的，不需要移动的机械部件。