Method and device for measuring monobromethane concentration in fumigation tank by plasma emission spectroscopy
A technology of emission spectroscopy and plasma, which is applied in the field of measuring the concentration of methyl bromide in fumigation tanks by plasma emission spectroscopy, can solve the problems that it is difficult to give the spatial distribution of methyl bromide concentration in fumigation tanks, the concentration is not real-time, and the stability is poor. Achieve the effect of low cost, simple operation and high sensitivity
Active Publication Date: 2012-05-30
BEIJING TECHNOL SCI
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Problems solved by technology
These test methods all need to use sampling devices during the fumigation process, so the detected concentration is not real-time, and it is difficult to give the spatial distribution of the concentration of methyl bromide in the fumigation tank. At the same time, these measurement methods are costly and poor in stability
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Embodiment 1
[0025] The invention provides a device for measuring the concentration of methyl bromide in a fumigation tank by using plasma emission spectrometry, the structure of the device is as follows: figure 1Shown: including a pulsed radio frequency power source 1, a measuring probe 2 and a spectrum analysis system 3, the radio frequency power, pulse width and pulse interval of the pulsed radio frequency power source are adjustable, wherein the frequency of the pulsed radio frequency power source is 13.56MHz, and the pulse The pulse width of the RF power source is adjustable from 1 to 10 seconds; the pulse interval of the pulsed RF power source is adjustable from 1 to 10 minutes; the power of the pulsed RF power source is adjustable from 300 to 500 W; the measuring probe consists of a hollow cathode discharge tube 6, full Reflecting lens 12, focusing lens 13 and optical fiber 14 are made up; Spectral analysis system is made up of high-resolution spectrometer and computer, wherein pulse...
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The invention relates to a method and a device for measuring the monobromethane concentration in a fumigation tank by a plasma emission spectroscopy, wherein the device belongs to fluid machines. The device is an insertion-type pulse stream generator which enables fluid to generate pressure oscillation change through changing the stream line of the fluid in the state that no external energy source is added. The insertion-type pulse stream generator comprises a round flow channel, an insertion core, an oscillation chamber and a swinging channel, wherein one end of the oscillation chamber is connected with the round flow channel and the other end is connected with the swinging channel, the round flow channel is provided with a screw thread insertion core boss hole, and the insertion core isinserted into the round flow channel through the sealed threaded connection of the screw thread insertion core boss hole. The invention has the main advantages of wide application range no matter themedium is gas or liquid, simple structure, and higher frequency of the generated pulse stream at 20-2000 Hz in general.
Description
technical field [0001] The invention relates to the field of plasma source application technology and emission spectrum analysis of gas components, in particular to a method and device for measuring the concentration of methyl bromide in a fumigation tank by using plasma emission spectroscopy. Background technique [0002] With plasma as the excitation light source, the electrons in the outer shell of atoms transition from high energy level to low energy level, and then return to the low energy state in the form of radiated energy. The spectrum obtained is the plasma emission spectrum. Different elements or groups have different emission spectra, and the intensity of the spectra is related to the content of each element, so plasma spectroscopic analysis can be used for component analysis of material systems. At present, the plasma sources commonly used in the measurement of emission spectra include DC arc, AC arc, high-voltage spark and high-frequency plasma source. Among th...
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IPC IPC(8): G01N21/73
Inventor 马志斌彭建翁国峰艾华陶洪
Owner BEIJING TECHNOL SCI