公开(公告)号：US4563585A

公开(公告)日：1986-01-07

申请号：US422478

申请日：1982-09-23

Applicant: T. Victor Ward

Inventor： T. Victor Ward

IPC: G01J3/28 ,  G01J3/457 ,  G01J1/42

CPC classification number: G01J3/457 ,  G01J2003/2866

Abstract: In the monitoring of gas or vapor concentrations in a gas sample by comparing the transmission of light through the sample at different wavelengths corresponding to behaviorial maxima and minima of the gas, the different wavelengths are selected by permitting light to fall alternately on different sets of slits in an entrance mask of a spectroscope so that light diffracted by a grating in the spectroscope at the wavelengths represented by the slits in the two sets will fall on an exit slit in an exit mask of the spectroscope and thence pass to a photodetector. This arrangement enables the shift between the different sets of wavelengths to be achieved without introducing mechanical jitter, since the photodetector output may be electronically gated so as to be measured only for predetermined periods when light is passing first through one and then through the other set of slits.

Abstract translation: 在通过比较对应于气体的行为最大值和最小值的不同波长的不同波长的透射光的透射来监测气体样品中的气体或蒸汽浓度时，通过允许光在不同组的狭缝上交替地下降来选择不同的波长 在分光镜的入射掩模中，使得由两组中的狭缝表示的波长在光谱仪中由光栅衍射的光将落在分光器的出射掩模中的出射狭缝上，然后传递到光电检测器。 这种布置使得能够实现不同波长组之间的偏移而不引入机械抖动，因为光电检测器输出可以电子门控，以便仅在光首先通过一个然后通过另一组 狭缝