公开(公告)号：US3911277A

公开(公告)日：1975-10-07

申请号：US49167274

申请日：1974-07-25

Applicant: BECKMAN INSTRUMENTS INC

Inventor： CEDERSTRAND CARL N ,  KEENAN CHARLES A

IPC: G01N21/35 ,  G01N21/34

CPC classification number: G01N21/3504

Abstract: A sensor unit is provided for selective detection of one or another of gaseous pollutants by response to absorption of infrared radiation by the pollutant to be detected. The unit contains a pair of thermistor elements mounted back to back in a housing having two opposite windows, in each of which filters are mounted. These filters are selective for the different radiation absorption characteristics of two different gaseous pollutants such as carbon monoxide and hydrocarbons. Each thermistor is behind a different filter. The unit is rotatable to expose one filter window or the other to radiation passing through the sample containing the pollutant to be measured. A shield is provided to shade the filter window which is not to be exposed to radiation.

Abstract translation: 提供传感器单元，用于通过响应待检测污染物的红外辐射的吸收来选择性地检测一种或另一种气态污染物。 该单元包含一对背对背安装的热敏电阻元件，该热敏电阻元件具有两个相对的窗口，每个过滤器都安装在其中。 这些过滤器对于两种不同的气体污染物如一氧化碳和碳氢化合物的不同辐射吸收特性是选择性的。 每个热敏电阻都位于不同的过滤器之后。 该单元可旋转以将一个过滤窗或另一个过滤窗暴露于通过含有要测量污染物的样品的辐射。 提供屏蔽以遮蔽不暴露于辐射的过滤器窗口。

公开(公告)号：US3562522A

公开(公告)日：1971-02-09

申请号：US3562522D

申请日：1968-09-18

Applicant: BECKMAN INSTRUMENTS INC

Inventor： CEDERSTRAND CARL N ,  DAVIS JAMES C ,  KEENAN CHARLES A ,  RANDALL JERROLD H

IPC: F02D41/14 ,  G01N21/35 ,  G01N21/26

CPC classification number: F02D41/1451 ,  G01N21/3504

Abstract: A nondispersive infrared analyzer having a source, flow cell, filter and detector is disclosed. The inlet to the flow cell may be switched from one of two intakes and the outlet is connected to a jet pump. With air flowing through the cell the zero suppression control is adjusted to reduce the signal input to the DC amplifier to zero. The calibration blade is started and the span control adjusted to provide a given up-scale reading of the meter. The analyzer is then calibrated to provide a reading directly in concentration of the desired constituent.

公开(公告)号：US3897153A

公开(公告)日：1975-07-29

申请号：US38200573

申请日：1973-07-23

Applicant: BECKMAN INSTRUMENTS INC

Inventor： KEENAN CHARLES A ,  CEDERSTRAND CARL N

IPC: G01J1/30 ,  G01N21/37 ,  G01N21/34 ,  G01N21/22

CPC classification number: G01J1/30 ,  G01N21/37

Abstract: Phase and amplitude balance adjustment are provided for a gas analyzer of the type in which two infrared beams are generated, one passed through a cell containing a standard and the other through a cell containing a sample gas, constituents in which are to be detected and measured; and there is a detector which compares the energy absorption in the two cells to provide a measure of the gas content. In this type of gas detector there is a chopper consisting of a rotating shutter with two sectors which rotate in front of two apertures through which infrared beams are transmitted from two different infrared beam generators. Phase adjustment is accomplished mechanically by physically moving a mounting plate carrying the two infrared beam generators with respect to the position of the apertures. Amplitude balance adjustment is accomplished by adjusting the relative electrical energy supplied to the two infrared beam generators.

Abstract translation: 提供相位和幅度平衡调整用于产生两个红外光束的类型的气体分析仪，一个通过含有标准的电池，另一个通过含有样品气体的电池，其中要检测和测量的组分 ; 并且存在一个检测器，其比较两个电池中的能量吸收以提供气体含量的量度。 在这种类型的气体检测器中，有一个由两个扇区旋转的快门组成的斩光器，两个扇区在两个孔的前面旋转，两个红外光束通过两个孔从两个不同的红外光束发生器传播。 通过相对于孔的位置物理地移动携带两个红外光束发生器的安装板来机械地实现相位调整。 振幅平衡调节是通过调节供应给两个红外光束发生器的相对电能实现的。