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Optical Gas Analyzer

A gas analysis and optical technology, which is applied in the direction of material analysis, measurement device, and material analysis by optical means, and can solve the problems of large residual error and so on.

Active Publication Date: 2017-03-01
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is always a residual error, and the more interference components affecting the measurement, the greater the residual error

Method used

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  • Optical Gas Analyzer
  • Optical Gas Analyzer
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Embodiment Construction

[0026] press figure 1 In a tube-shaped measurement sample cell 1 of the optical gas analysis unit, on the one hand, a measurement cavity M through which the gas to be measured flows and on the other hand, a reference cavity R filled with a reference gas is provided. The measuring sample cell 1 is longitudinally irradiated by an infrared ray source 2 arranged on its light input side. Before the infrared rays reach the measurement sample cell 1, it passes through a modulation unit 3 with a rotating chopper disc 4 for phase reversal.

[0027] A photo-pneumatic detector 5 is placed on the light output side of the measuring sample cell 1, which measures the light beam weakened by absorption loss in order to generate an electrical signal S 1 , Used to analyze the gas concentration according to the principle of NDIR spectroscopy. In order to improve the selectivity in gas mixture analysis, a broadband receiver 6 is provided downstream of the photo-pneumatic detector 5. An optical inter...

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Abstract

The device has a measuring chamber (M) formed in a tubular absorption cell (1), and an infrared radiation source (2) arranged at an input side of the device. An opto pneumatic detector (5) performs gas concentration analysis according to a principle of the non-dispersive infrared (NDIR) spectroscopy and is arranged at an output side of the device. An optical unit comprises a broad band receiver (6) with an upstream optical interference filter (7) that is utilized in addition to the detector to suppress influences caused by noise from components in a measurement gas. The optical interference filter is designed as a multivariate optical element, and the broad band receiver is designed as a pyroelectric detector. Independent claims are also included for the following: (1) computer program product comprising a set of instructions for analyzing a measurement gas (2) a data carrier comprising a set of instructions for analyzing a measurement gas.

Description

Technical field [0001] The present invention relates to an optical gas analysis device, which includes at least one measurement cavity formed in at least one tubular measurement sample cell through which a gas to be measured flows, and the at least one measurement cavity is provided by at least one infrared sensor set on the input side. The radiation source is irradiated longitudinally, and at least one opto-pneumatisch detector arranged on the output side for analyzing the gas concentration working according to the NDIR spectrum measurement principle measures the light beam weakened by the absorption loss of the infrared radiation source, There is an optical device for improving selectivity in gas mixture analysis. Background technique [0002] The application of this gas analysis device that works according to the principle of NDIR spectroscopy ranges from concentration analysis of gases such as carbon monoxide or carbon dioxide to air monitoring to trace analysis of complex ga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/37
CPCG01N21/3504G01N21/37G01N2021/3545G01N2201/1215G01N2201/129
Inventor C·拉特克J·卡普勒
Owner ABB (SCHWEIZ) AG