Infrared gas analyzer and method for operating said analyzer

• Main Authors: WERNER G. BLEY, ULRICH DOBLER, GANTER VOSS
• Format: Patent
• Language: Chinese; English
• Published: 11.08.2004
• Edition: 7
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR

本发明涉及一种红外线气体分析仪(1)，它特别适合于在泄漏探测时用作气体检测器，它具有一个流过测量气体的器皿(测量器皿2)，一个IR光源(4，5，42)，它产生穿过测量器皿(2)的IR光，分析仪还具有一个检测器(35)，它能够测量在测量气体中的IR光吸收量；为了得到日常适用的和廉价的分析仪，本发明建议：除了流过测量气体的测量器皿(2)外，存在一个参考器皿(3)，其中流过在测量气体吸入位置四周吸入的参考气体，并且对参考器皿配置同一个或一个其它的光源(4，5，42)和同一个检测器(35)，此外存在调制穿过器皿(2，3)的IR光的装置(38，41)，并且存在形成测量值的装置(36)，它们可以在通过测量在测量器皿中的IR吸收量而获得的信号上考虑通过测量参考器皿(3)中的吸收量而得到的基底信号的影响。 The invention relates to an infrared gas analyser (1), especially for use as a gas detector for leak detection using a sampling probe. Said gas analyser comprises a vessel (test vessel 2), through which a test gas flows, and an infrared light source (4, 5, 42) which produces an infrared light that shines through the test vessel (2). The analyser further encompasses a detector (35) that facilitates measurement of the infrared light absorption in the test gas. The aim of the invention is to provide at low costs an analyser that is apt for every day use. To this end, a reference vessel (3) through which a reference gas flows is provided in addition to the test vessel (2) through which the test gas flows. A reference gas is sucked from the environment of the test gas suction area. The same or an additional light source (4, 5, 42) and the same detector (35) are allocated to said reference vessel. The analyser is provided with means (38, 41) that effect a modulation of the infrared light shining through the vessel (2, 3). Means (36) are provided which produce the measured values and which allow that the background signals obtained by the infrared absorption in the gas of the reference vessel (3) are taken into consideration for the signals obtained by measuring the infrared absorption in the test vessel.