Method for determining the optical measurement path length in a duct gas monitoring system
A monitoring system, optical measurement technology, applied in the direction of color/spectral characteristic measurement, measurement device, scattering characteristic measurement, etc., can solve the problem of difficulty in estimating optical measurement path length, etc.
Inactive Publication Date: 2012-08-15
SIEMENS AG
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Problems solved by technology
However, since the purge gas is vented into the gas line, it is difficult to estimate the actual optical measurement path length, especially if the measurement path is short and the purge gas flow rate is high
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[0016] figure 1 and figure 2 Both show a gas conduit 1 through which conduit gas 2 flows. Flow direction is indicated by arrows. To measure the concentration of selected gas constituents, light 3 is emitted from a light source 4 through the gas conduit 1 to a measuring detector 5 . The light source 4 may be a laser diode or an end piece of an optical fiber carrying the light of an external light source. The measurement detector 5 can be any conventional type of photodetector.
[0017] The light source 4 and the measuring probe 5 are arranged in respectively different optical measuring heads 6 and 7 which are installed at a position diametrically opposite the wall 8 of the gas line 1 . Each of the substantially identical measuring heads 6 and 7 has a longitudinal chamber 9 , 10 which opens into the gas line 1 at one end and contains the respective active optics 4 or 5 at the other end. In the embodiment shown, each of the chambers 9 , 10 contains an optical window separat...
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Method for determining the optical measurement path length in a duct gas monitoring system In a duct gas monitoring system which is adapted to measure the concentration of a gas component of the duct gas (2) from its wavelength-specific absorption light (3) is sent from a light source (6) through a first purging tube (15), a gas duct (1) and a second purging tube (16) to a measuring detector (5), wherein the purging tubes (15, 16) open into the gas duct (1) and are flushed with a purge gas which, after flushing, is discharged into the gas duct (1). In order to provide an improved estimate of the optical measurement path length (L), especially when process conditions vary, the purging tubes (15, 16) are, during the measuring of the concentration of the gas component, momentarily filled up with the duct gas (2), and the optical measurement path length (L) is calculated from the known path length between the light source (4) and the measuring detector (5) multiplied by the ratio of the light absorption measured when the purging tubes (15, 16) are filled with the purge gas and the light absorption measured when the purging tubes (15, 16) are filled with the duct gas (2), wherein the light absorptions are obtained in temporally adjacent measurements.
Description
technical field [0001] The invention relates to a method for determining an optical measurement path in a pipeline gas monitoring system, adapted to send light from a light source through a first purge tube, a gas pipeline and a second purge tube to a measuring detector, from its wavelength The specific absorption measures the concentration of the gas components of the line gas, wherein the purge tube opens into the gas line and is filled with purge gas which is discharged into the gas line after filling. Background technique [0002] In spectroscopic gas analysis, the concentration of a gas component or gas components is known in a gas mixture (measurement gas), which is determined via the determined wavelength-specific absorption of the gas component or the determined absorption spectrum of the measurement gas, respectively. For this purpose, the measurement gas is introduced in a measurement volume with a predetermined optical measurement path length, eg a sample tube or,...
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IPC IPC(8): G01M15/10G01N21/35G01N21/53G01N21/85
CPCG01N21/3504G01N21/85G01N2021/151
Inventor 弗雷德里克·库奥帕
Owner SIEMENS AG