公开(公告)号：US4692621A

公开(公告)日：1987-09-08

申请号：US786736

申请日：1985-10-11

Applicant: Robert E. Passaro ,  Kevin G. Williams ,  George K. Parnoff ,  Raymond E. Rogers

Inventor： Robert E. Passaro ,  Kevin G. Williams ,  George K. Parnoff ,  Raymond E. Rogers

IPC: G01N21/31 ,  G01N21/35 ,  G01N21/37 ,  G01N21/61

CPC classification number: G01N21/3504 ,  G01N2021/3129 ,  G01N21/314 ,  G01N2201/127 ,  G01N2201/12723

Abstract: A gas analyzer is described comprising a sample cell for containing a gas mixture to be analyzed, a source for producing and directing infrared energy through the sample cell, a rotary filter wheel having at least one filter thereon for passing infrared energy limited to a wavelength band within the characteristic absorption band of a predetermined gas and having a dark level region substantially opaque to infrared energy, a drive for supporting and rotating the filter wheel to successively interpose the filter and the dark level region between the source and the sample cell in the path of the infrared energy directed by the source, a detector for detecting infrared energy passing through the sample cell and producing an electrical signal representative thereof, and a signal processor connected to the detector for producing an output indicating the concentration of the predetermined gas in the sample cell by comparing the electrical signals produced by the detector with the filter positioned in the infrared energy path and with the dark level region positioned in the infrared energy path. The dark level region has a substantially fully reflective surface oriented toward the sample cell when positioned in the infrared energy path whereby infrared energy impinging thereon is reflected.

Abstract translation: 描述了一种气体分析器，其包括用于容纳要分析的气体混合物的样品池，用于产生并引导通过样品池的红外能量的源，旋转滤光轮，其上具有至少一个滤光器，用于使红外能量限制在波长带 在预定气体的特征吸收带内并且具有对红外能量基本不透明的暗电平区域的驱动器，用于支撑和旋转滤光轮的驱动器，用于将滤光器和暗电平区域连续插入光源和样品池之间的路径 由源引导的红外能量，用于检测通过样品池的红外能量并产生代表其的电信号的检测器，以及连接到检测器的信号处理器，用于产生指示样品中预定气体浓度的输出 通过将检测器产生的电信号与滤波器posi进行比较来实现 在红外能量路径和暗区域位于红外能量路径中。 当位于红外能量路径中时，暗层区域具有朝向样品池定向的基本上完全反射的表面，由此反射其上的红外能量。

公开(公告)号：US4423739A

公开(公告)日：1984-01-03

申请号：US295486

申请日：1981-08-24

Applicant: Robert E. Passaro ,  Irvin G. Burough

Inventor： Robert E. Passaro ,  Irvin G. Burough

IPC: A61B5/08 ,  A61B5/00 ,  A61B5/083

CPC classification number: A61B5/1455 ,  A61B5/0836

Abstract: A method and apparatus are described for determining the partial pressure of carbon dioxide in the arterial blood of a patient. The method and apparatus are particularly useful where the patient is under anesthesia. Carbon dioxide concentration is measured at the end tidal of the patient's exhaled breath. Nitrous oxide concentration is also measured so that the measured values of the carbon dioxide concentration may be corrected in accordance with the measured value of the nitrous oxide concentration. Particular wavelengths of detection are described, together with other apparatus parameters to provide a high level of accuracy.

Abstract translation: 描述了一种用于确定患者的动脉血中二氧化碳的分压的方法和装置。 该方法和装置在患者处于麻醉状态时特别有用。 二氧化碳浓度是在患者呼出的呼气的最后潮汐测量的。 还测量一氧化二氮浓度，以便根据一氧化二氮浓度的测量值来校正二氧化碳浓度的测量值。 与其他设备参数一起描述了特定的检测波长以提供高水平的精度。

公开(公告)号：US4398091A

公开(公告)日：1983-08-09

申请号：US295570

申请日：1981-08-24

Applicant: Robert E. Passaro

Inventor： Robert E. Passaro

IPC: G01N21/35 ,  G01N21/26

CPC classification number: G01N21/3504

Abstract: An infrared gas analyzer is described wherein infrared energy is directed from a suitable source through a sample cell, the infrared energy being interrupted at a predetermined frequency. Infrared energy of a preselected wavelength causes a detector for each monitored gas to produce a signal proportional to the infrared energy passing through the sample cell and having a frequency corresponding to the predetermined frequency. Each preselected wavelength corresponds to the characteristic absorption wavelength of a preselected gas. A signal processor for the analyzer includes a preamplifier adapted to compensate for temperature variations in the detector while an output amplifier is adapted to compensate for temperature variations in the sample cell in order to provide a more accurate output signal.

Abstract translation: 描述了一种红外气体分析仪，其中红外能量通过样品池从适当的源引导，红外能量以预定的频率被中断。 预选波长的红外能量使得每个被监测气体的检测器产生与通过样品池的红外能量成比例的信号并且具有对应于预定频率的频率。 每个预选波长对应于预选气体的特征吸收波长。 用于分析器的信号处理器包括前置放大器，其适于补偿检测器中的温度变化，而输出放大器适于补偿采样室中的温度变化，以便提供更准确的输出信号。

公开(公告)号：US4346296A

公开(公告)日：1982-08-24

申请号：US178302

申请日：1980-08-15

Applicant: Robert E. Passaro ,  Kevin Williams

Inventor： Robert E. Passaro ,  Kevin Williams

IPC: G01N21/61 ,  G01N21/03 ,  G01N21/27 ,  G01N21/35 ,  G01N21/26

CPC classification number: G01N21/3504 ,  G01N21/03

Abstract: A non-dispersive infrared gas analyzer is described. Infrared energy is directed through a sample cell, and is interrupted at a predetermined frequency. The infrared energy at at least one preselected wavelength is detected to produce an AC signal having an amplitude proportional to the infrared energy passing through said sample cell and having a frequency corresponding to the predetermined frequency. The preselected wavelength corresponds to the characteristic absorption wavelength of a preselected gas. This AC signal is processed to produce a DC signal having an amplitude proportional to the concentration of the preselected gas in the mixture being analyzed. The signal processor includes an output amplifier, a voltage biasing network including a summing junction connected to the input of the amplifier, and a first variable control manually adjustable to bring the current at the summing junction to zero in the presence of a non-absorbing gas in the sample cell. A second variable control is connected in a feedback loop from the output of the amplifier to the input thereof for span calibration.

Abstract translation: 描述了非分散红外线气体分析仪。 红外能量被引导通过样品池，并以预定的频率中断。 检测至少一个预选波长的红外能量以产生具有与通过所述采样单元并且具有对应于预定频率的频率成比例的红外能量的振幅的AC信号。 预选波长对应于预选气体的特征吸收波长。 该AC信号被处理以产生具有与所分析的混合物中预选气体浓度成比例的振幅的DC信号。 信号处理器包括输出放大器，电压偏置网络，其包括连接到放大器的输入端的求和点，以及可手动调节的第一可变控制器，以使得在非吸收气体存在的情况下使求和结点处的电流为零 在样品池中。 第二可变控制器从放大器的输出到其输入的反馈回路中连接用于量程校准。

公开(公告)号：US4437004A

公开(公告)日：1984-03-13

申请号：US295485

申请日：1981-08-24

Applicant: Robert E. Passaro ,  Irvin G. Burough

Inventor： Robert E. Passaro ,  Irvin G. Burough

IPC: G01N21/35 ,  G01J1/04 ,  G01N21/01

CPC classification number: G01N21/3504 ,  G01N2201/024

Abstract: An infrared gas analyzer is described wherein infrared energy is directed through a sample cell from a source at one end thereof. A detector at the opposite end of the sample tube monitors infrared energy of at least one pre-selected wavelength in order to produce a signal representative of the infrared energy passing through the sample cell. The analyzer is of modular construction including a disposable sample cell, an infrared source housing, a detector housing and printed circuit boards mounting signal processing components for the analyzer. A mounting base is adapted for receiving the sample tube, housings and printed circuit boards in operating alignment and interconnection with each other, detents positively securing the components in place.

Abstract translation: 描述了红外气体分析仪，其中红外能量在其一端通过来自源的样品池。 在样品管的相对端的检测器监测至少一个预选波长的红外能量，以产生表示通过样品池的红外能量的信号。 分析仪具有模块化结构，包括一次性样品池，红外源壳体，检测器壳体和用于分析仪的信号处理组件的印刷电路板。 安装基座适于接收样品管，壳体和印刷电路板，其操作对准并彼此互连，制动器将组件正确地固定在适当的位置。

公开(公告)号：US4687934A

公开(公告)日：1987-08-18

申请号：US818342

申请日：1986-01-10

Applicant: Robert E. Passaro ,  Raymond E. Rogers ,  Craig J. Griffith

Inventor： Robert E. Passaro ,  Raymond E. Rogers ,  Craig J. Griffith

IPC: G01J1/44 ,  G01N21/27 ,  G01N21/31 ,  G01N21/35 ,  G01J1/00 ,  G01D18/00

CPC classification number: G01N21/274 ,  G01N2021/3159 ,  G01N2021/3166 ,  G01N21/3504 ,  G01N2201/126 ,  G01N2201/1273 ,  G01N2201/12769

Abstract: Automatic zeroing apparatus zeroes an infrared gas analyzer automatically upon the occurrence of preselected conditions to indicate zero in the absence of absorption of infrared radiation by a gas mixture being analyzed. The gas analyzer has a sample cell for containing a gas mixture to be analyzed. Infrared radiation directed through the sample cell is detected at a preselected wavelength to produce a detection signal. A signal processor outputs a signal systematically related to the difference between the detection signal and a reference signal. For zeroing the sample cell is filled with gas substantially nonabsorbent of infrared radiation at the respective characteristic wavelength. A comparator produces an error signal when the output signal differs from zero. A gain control automatically controls the signal level of the detection signal to reduce the output signal substantially to zero with the nonabsorbent gas filling the sample cell. The preselected conditions may include the passage of a predetermined time and a temperature drift beyond a predetermined limit.

Abstract translation: 自动归零装置在发生预选条件时自动归零红外气体分析仪，以便在被正在分析的气体混合物不吸收红外辐射时指示为零。 气体分析仪具有用于容纳要分析的气体混合物的样品池。 以预选的波长检测引导通过样品池的红外辐射，以产生检测信号。 信号处理器输出与检测信号和参考信号之间的差异系统地相关的信号。 为了归零，样品池中填充有相应特征波长的基本上不吸收红外辐射的气体。 当输出信号与零不同时，比较器产生一个误差信号。 增益控制器自动控制检测信号的信号电平，使填充样品池的非吸收气体将输出信号基本上降至零。 预选条件可以包括经过预定时间和温度漂移超出预定极限。