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Spectroscopic analyzer and spectroscopic analysis method

A spectral analysis, one-way technology, applied in the direction of spectrometry/spectrophotometry/monochromator, material analysis by optical means, analysis of materials, etc., can solve the problem of inaccurate pressure correction, etc.

Active Publication Date: 2017-11-21
HORIBA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] However, in a structure in which a pump is arranged downstream of the measurement cell, the sample gas in the measurement cell will be in a decompressed state, so accurate pressure correction cannot be performed using the conventional linear relationship without intercept.

Method used

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  • Spectroscopic analyzer and spectroscopic analysis method
  • Spectroscopic analyzer and spectroscopic analysis method
  • Spectroscopic analyzer and spectroscopic analysis method

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Embodiment Construction

[0035] One embodiment of the infrared spectroscopic analysis device of the present invention will be described below with reference to the drawings.

[0036] The infrared spectrum analysis device 100 of the present embodiment is an exhaust gas analysis device that measures the concentration of a plurality of components contained in exhaust gas as a sample gas discharged from an internal combustion engine such as an automobile as time-series data.

[0037] Specific as figure 1 As shown, the infrared spectrum analysis device 100, for example, samples part or all of the exhaust gas discharged from the exhaust pipe of the automobile by the sample sampling part 2, and the exhaust gas sampled by the sample sampling part 2 is not diluted. into the measurement unit 3, using the FTIR method to detect carbon monoxide (CO), carbon dioxide (CO 2 ), nitric oxide (NO), nitrogen dioxide (NO 2 ), nitrogen oxides (NOx), water (H 2 O) and other multiple components to measure each concentrat...

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Abstract

The present invention is a spectroscopic analyzer that when measuring the concentration of a predetermined component contained in sample gas in a reduced pressure state lower than atmospheric pressure, obtains the concentration of the predetermined component with accuracy. The spectroscopic analyzer is one that measures the absorbance of the predetermined component contained in the sample gas in a reduced pressure state lower than atmospheric pressure, and calculates the concentration of the predetermined component with use of a calibration curve indicating the relationship between the absorbance of the predetermined component and the concentration of the predetermined component and a relational expression between the pressure of the sample gas at the time of the measurement and the concentration of the predetermined component. In addition, in a graph with one axis as pressure axis and the other axis as concentration axis, the relational expression has an intersection point other than zero with the pressure axis.

Description

technical field [0001] The present invention relates to spectroscopic analysis devices using infrared spectroscopy such as Fourier transform infrared spectroscopy. Background technique [0002] Conventionally, as a device for measuring the concentration of a predetermined component contained in a sample gas such as exhaust gas, for example, there is a device using the FTIR (Fourier Transform Infrared Spectroscopy) method (Patent Document 1 (Japanese Patent Laid-Open Publication No. Hei 9-101257 )). [0003] In the analyzer employing the FTIR method, a pump is provided upstream of the measurement cell, and the pressure of the sample gas in the measurement cell becomes atmospheric pressure or a pressure in the vicinity thereof. That is, the pressure at the time of measurement of the sample gas is atmospheric pressure or a pressure in its vicinity. [0004] Here, the concentration of the specified component is calculated by using a calibration curve obtained from the relation...

Claims

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/31G01J3/0297G01N21/274G01J3/26G01J3/42G01N21/3504G01N33/004G01N2021/3595Y02A50/20G01N33/0037G01N2201/127G06T11/206
Inventor 西村克美
Owner HORIBA LTD