Iodine flow measuring device and application thereof
A flow measurement device and flow technology, applied in the direction of mass flow measurement devices, indirect mass flow meters, etc., can solve the problems that the accuracy depends on the machining accuracy of the nozzle, cannot obtain valid data, and cannot be performed, so as to solve the problem of inaccurate measurement or even unmeasurable effect
Inactive Publication Date: 2011-08-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
At present, Venturi tube measurement is used, and the accuracy of measurement depends on the processing accuracy of the nozzle, and it is impossible to obtain effective data when the flow rate condition is not met.
Single-wavelength absorption spectroscopy cannot be performed due to the limitation of contamination of the test window
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Embodiment 1
[0027] The present invention is based on the innovative application of the spectral absorption method. According to Beer's absorption law, a beam of light will be absorbed after passing through the gas, and the transmitted light intensity and the initial light intensity have the following relationship:
[0028] I=I 0 exp( - σnL)
[0029] I 0 is the initial light intensity, I is the transmitted light intensity, σ is the absorption cross section (cm 2 ), n is the gas concentration (molecules / cm 3 ), L is the absorption length (cm). Since the window will be polluted by the dust carried by the airflow, the relationship between the transmitted light intensity and the initial light intensity should be changed to:
[0030] I=I 0 (1—α 1 )*exp(-σnL)(1—α 2 )
[0031] alpha 1 and alpha 2 are the pollution absorption coefficients of the light incident window and exit window, respectively. If the single-wavelength spectral absorption method is used, the measured gas concentrati...
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The invention discloses an iodine flow measuring device. One side of a test absorption cell which needs iodine flow measuring is provided with a light source, the left and right sides of the test absorption cell on the emitting light path of the light source are provided with symmetrical quartz glass testing windows respectively, a focusing lens is arranged between the testing window and the light source, and the outer side of the testing window on the other side of the test absorption cell is provided with a beam splitting slice; the emitted light of the light source which passes through thetest absorption cell is divided into two parts of lights by the beam splitting slice, wherein the beam passing through the beam splitting slice is test light, and the beam reflected by the beam splitting slice is reference light; a test light path and a reference light path on the outer side of the beam splitting slice are provided with the focusing lens, a band-pass interference filter and a silicon probe in order respectively; and the silicon probe is connected with a data acquisition board on the computer through wires, and then the computer carries out data acquisition and data processing. Experimental results show that: the iodine flow measuring device can effectively solve the problem that the measurement is inaccurate, and even cannot be performed because of the pollution of the testing window, and has the advantages of small and exquisite structure and universal applicability.
Description
technical field [0001] The invention relates to a technique for measuring iodine flux based on absorption spectroscopy. With this method of measurement, the problem of inaccurate or even impossible measurements due to window contamination is resolved. The commonly used single-wavelength absorption spectrum is difficult to measure the iodine flow accurately, because the iodine vapor will condense on the test window, and some impurities formed by iodine in the container and pipeline will also pollute the window, and this part of the pollution cannot be heated. Removed. The iodine flow measurement technology has strong resistance to window pollution and good engineering reliability, which provides a reliable guarantee for the measurement of key parameters of oxygen-iodine chemical lasers, thereby promoting the development of high-energy oxygen-iodine chemical lasers. Background technique [0002] The supersonic oxygen-iodine chemical laser is mainly composed of a singlet oxyg...
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IPC IPC(8): G01F1/86
Inventor 李国富多丽萍于海军王增强汪健
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI