Calibration-free device and measurement method for a mercury analyzer
A measurement method and a calibration-free technology, which is applied in the direction of measuring devices, analysis materials, and material excitation analysis, can solve problems such as changes, and achieve the effects of reducing detection costs, reducing workload, and improving detection efficiency
Active Publication Date: 2021-02-02
NANJING INST OF TECH
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Problems solved by technology
[0002] Cold atomic absorption method and cold atomic fluorescence method are currently commonly used methods for measuring the concentration of mercury in gas, but since the performance of photoelectric devices (light source, photodetector, etc.) will change with time or changes in external conditions, so After a period of use, the photoelectric devices in the system need to be recalibrated, resulting in the need for a complete calibration system for the entire device
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[0047] The content of the invention of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0048] see Figure 1-2, a calibration-free device for a mercury analyzer, comprising a light source 1, a cylindrical air chamber 2, a first plane mirror 3, a second plane mirror 4, a first color filter 5, a second color filter 6, and a third color filter 7. Rotary platform 8, photomultiplier tube 9 and data acquisition analyzer 10; the cylindrical air chamber 2 is a hollow structure, the two ends are respectively light incident end 21 and light exit end 22, and the upper part of the cylindrical air chamber is symmetrically arranged There is an air inlet 23 and an air outlet 24 for gas in and out, and an optical window 25 is provided at the bottom of the cylindrical air chamber; the light source 1 is fixedly installed on the light incident end 21 of the cylindrical air chamber, A first color filter 5 is provided between t...
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The invention discloses a calibration-free device and a measuring method for a mercury analyzer, comprising a light source, a cylindrical air chamber, a first plane mirror, a second plane mirror, a first color filter, a second color filter and a third color filter , rotating platform, photomultiplier tube and data acquisition analyzer. In the present invention, by using a photomultiplier tube to measure the light intensity of the cold atomic absorption method and the cold atomic fluorescence method in time, the mercury concentration is not related to the emission power of the light source, but only related to the ratio of light intensity; at the same time, it is obtained by combining the photomultiplier tube itself. The current ratio has nothing to do with the sensitivity of the photomultiplier tube, but is only related to the ratio of light intensity. The mercury concentration in the gas can be obtained directly from the current ratio measured by the photomultiplier tube, so there is no need to recalibrate the device during measurement. In actual use, the workload of the tester is reduced, the detection efficiency is greatly improved, and the use of raw materials in the calibration process is also saved, which reduces the detection cost.
Description
technical field [0001] The invention belongs to the technical field of mercury gas detection, in particular to a calibration-free device for a mercury analyzer and a measurement method thereof. Background technique [0002] Cold atomic absorption method and cold atomic fluorescence method are currently commonly used methods for measuring the concentration of mercury in gas, but since the performance of photoelectric devices (light source, photodetector, etc.) will change with time or changes in external conditions, so After a period of use, the photoelectric devices in the system need to be re-calibrated, resulting in the need for a complete calibration system for the entire device. The present invention utilizes the internal connection of the above two measurement methods to propose a calibration-free device and a measurement method thereof. Contents of the invention [0003] The object of the present invention is to provide a calibration-free device for a mercury analyz...
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IPC IPC(8): G01N21/33G01N21/01G01N21/64
CPCG01N21/01G01N21/33G01N21/6404
Inventor 张健沈卫康余辉龙覃翠赵静魏峘
Owner NANJING INST OF TECH