公开(公告)号：WO1996029591A1

公开(公告)日：1996-09-26

申请号：PCT/CA1996000163

申请日：1996-03-20

Applicant: SCI-TEC INSTRUMENTS INC.

Inventor： SCI-TEC INSTRUMENTS INC. ,  IVANOV, Evgeniy, Vladimirovich

IPC: G01N21/35

CPC classification number: G01J3/453 ,  G01J3/26 ,  G01N21/3518 ,  G01N2021/451

Abstract: An optical gas analyzer includes optical, mechanical and electronic systems. The optical system includes a collimator, a light filter, a modulated interference polarization filter (IPF), and a photo detector. The modulated IPF has two polarizers, crossed or parallel to each other, with an optical modulator and a birefringent plate mounted between them. The birefringent plate has a variable thickness which is mechanically driven and controlled by the electronic system via the electro-mechanical driver. The photo detector has its output connected to the electronic system and is placed after IPF. The gas analyzer has the advantage of allowing the minimum detectable limit of the concentration of measured gas to be decreased by greatly reducing the influence of parasitic modulation. Parasitic modulation is induced by the optical modulator into the optical and electronic units of the gas analyzer and affects the output signal. However, synchronous modulation of the modulated IPF cancels the parasitic effect in the final output, based upon the difference of two such measurements.

Abstract translation: 光学气体分析仪包括光学，机械和电子系统。 光学系统包括准直器，光滤波器，调制干涉偏振滤波器（IPF）和光电检测器。 调制的IPF具有两个彼此交叉或平行的偏振器，光学调制器和安装在它们之间的双折射板。 双折射板具有可变的厚度，其通过电机驱动器由电子系统机械地驱动和控制。 光电检测器的输出连接到电子系统，并放置在IPF之后。 气体分析仪的优点是通过大大降低寄生调制的影响，可以降低测量气体浓度的最小检测限。 寄生调制由光调制器引入气体分析仪的光电单元并影响输出信号。 然而，调制IPF的同步调制基于两个这样的测量的差异来消除最终输出中的寄生效应。

公开(公告)号：WO1996029582A1

公开(公告)日：1996-09-26

申请号：PCT/CA1996000162

申请日：1996-03-20

Applicant: SCI-TEC INSTRUMENTS INC.

Inventor： SCI-TEC INSTRUMENTS INC. ,  IVANOV, Evgeniy Vladimirovich

IPC: G01J03/45

CPC classification number: G01J3/45

Abstract: A method of correlation interferometry analyzes only radiation in a predetermined spectral region where target gases absorb. Data is processed entirely in the interferometric domain. The interferometric response at these values is functionally dependent on the concentration of the investigated gas. The present invention allows one to increase the sensitivity of measurements of the concentrations of target gases with known spectrum contained in the investigated gas medium without greatly sacrificing selectivity, while sampling over only a subset of intervales required for Fourier spectroscopy.

Abstract translation: 相关干涉测量方法仅分析目标气体吸收的预定光谱区域中的辐射。 数据完全在干涉测量领域进行处理。 这些值的干涉响应在功能上取决于所研究气体的浓度。 本发明允许使用所研究的气体介质中包含的已知光谱的目标气体的浓度的测量的灵敏度提高，而不会极大地牺牲选择性，同时只在傅立叶光谱所需的间隔的子集上进行采样。

公开(公告)号：EP0815432A1

公开(公告)日：1998-01-07

申请号：EP96905635.0

申请日：1996-03-20

Applicant: Sci-Tec Instruments Inc.

Inventor： IVANOV, Evgeniy, Vladimirovich

IPC: G01J3 ,  G01N21

CPC classification number: G01J3/453 ,  G01J3/26 ,  G01N21/3518 ,  G01N2021/451

Abstract: An optical gas analyzer includes optical, mechanical and electronic systems. The optical system includes a collimator, a light filter, a modulated interference polarization filter (IPF), and a photo detector. The modulated IPF has two polarizers, crossed or parallel to each other, with an optical modulator and a birefringent plate mounted between them. The birefringent plate has a variable thickness which is mechanically driven and controlled by the electronic system via the electro-mechanical driver. The photo detector has its output connected to the electronic system and is placed after IPF. The gas analyzer has the advantage of allowing the minimum detectable limit of the concentration of measured gas to be decreased by greatly reducing the influence of parasitic modulation. Parasitic modulation is induced by the optical modulator into the optical and electronic units of the gas analyzer and affects the output signal. However, synchronous modulation of the modulated IPF cancels the parasitic effect in the final output, based upon the difference of two such measurements.

Abstract translation: 光学气体分析仪包括光学，机械和电子系统。 光学系统包括准直器，滤光器，调制干涉偏振滤光器（IPF）和光检测器。 调制的IPF具有两个彼此交叉或平行的偏振器，在它们之间安装有光学调制器和双折射板。 双折射板具有可变的厚度，该厚度由电子系统通过机电驱动器机械驱动和控制。 光电检测器的输出连接到电子系统，并放置在IPF之后。 气体分析仪的优点是，通过大大降低寄生调制的影响，可以降低测量气体浓度的最小可检测极限。 由光学调制器引起的寄生调制进入气体分析仪的光学和电子单元并影响输出信号。 然而，基于两次这种测量的差异，调制IPF的同步调制消除了最终输出中的寄生效应。