公开(公告)号：US3711708A

公开(公告)日：1973-01-16

申请号：US3711708D

申请日：1971-02-25

Applicant: OPTICAL COATING LABORATORY INC

Inventor： GEIGER D ,  DOLIN S ,  FOLCH A

IPC: G01J3/02 ,  G01J3/04 ,  G01J3/06 ,  G01J3/26 ,  G01J3/28 ,  G01J3/42 ,  G01N30/74 ,  G01N21/26

CPC classification number: G01J3/02 ,  G01J3/0202 ,  G01J3/0232 ,  G01J3/04 ,  G01J3/06 ,  G01J3/26 ,  G01J3/2889 ,  G01J3/42 ,  G01N30/74

Abstract: A rapid scan spectrum identifier fur use in identifying infrared spectrum of the output of a gas chromatograph to identify its absorption characteristics and includes an infrared source and beam splitter, a double beam chopper for alternately sending the infrared beam through a sample or reference gas cell mounted in a suitable furnace, the output of which is recombined and analyzed by a monochromator having a narrow output passband of energy detected by a rapid response detector, the output of which is processed by suitable electronic circuitry to provide a readout. The monochromator is of the scanning type in which a grating is synchronously scanned with a circular variable filter so that the first order output of the grating is selectively passed and higher orders rejected by the filter. The sample and reference gas cell furnace assembly utilizes specially constructed sample and reference gas cells symmetrically mounted in a furnace arrangement for maintaining input gas streams at equal temperatures within each cell and above the temperature of condensation of the sample under investigation. The beam chopper contains associated photoelectronics for physically determining the location of a chopping blade to thereby provide gating signals for indicating the presence at the detector of a sample, reference, or a background signals. These grating signals are used in sample and hold circuits to convert an essentially digitally sampled output into a relatively smooth continuous curve indicative of the absorption of the sample so that the readout represents the sample absorption characteristics corrected for reference for the carrier gas and background effects. The instrument is designed to operate with scan rates of approximately 6 and 30 seconds.

Abstract translation: 快速扫描光谱标识符用于识别气相色谱仪的输出的红外光谱以识别其吸收特性，并且包括红外源和分束器，用于交替地将红外光束通过样品或参考气体电池安装的双光束斩波器 在合适的炉中，其输出由具有由快速响应检测器检测到的能量的窄输出通带的单色仪重组和分析，其输出由合适的电子电路处理以提供读数。 单色仪是扫描型的，其中光栅与圆形可变滤波器同步扫描，使得光栅的一阶输出被选择性地通过，并且较高阶数被滤光器拒绝。