On-line monitoring device for content of methane and non-methane total hydrocarbon
A technology of non-methane total hydrocarbons and monitoring devices, applied in measurement devices, material analysis by optical means, instruments, etc., can solve the problems of complex detection devices and slow detection speed, avoid mutual interference, avoid the use of consumables, cost saving effect
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specific Embodiment approach 1
[0013] Specific implementation mode 1. Combination figure 1 Description of this embodiment, an online monitoring device for methane and non-methane total hydrocarbon content, combined with figure 1 , the monitoring device includes a main controller 1, a mid-infrared LED 3, a near-infrared laser 2, an electro-optic modulator 4, an optical filter 5, a gas absorption cell 6, a spectroscopic prism 7, a mid-infrared pyroelectric detector 8, a near-infrared Photodiode 9, full-wave rectifier bridge 10, analog-to-digital converter 11 and sampling device 12;
[0014] The mid-infrared LED 3 and the near-infrared laser 2 are simultaneously connected to the electro-optic modulator 4, the electro-optic modulator 4 is connected to the optical filter 5, and the optical filter 5 is connected to the gas absorption cell 6 connected, the gas absorption cell 6 is connected to the dichroic prism 7, and the dichroic prism 7 is connected to the mid-infrared pyroelectric detector 8 and the near-infr...
specific Embodiment approach 2
[0021] Specific embodiment two, combine figure 2 Describe this embodiment, this embodiment is another kind of structure of the on-line monitoring device of a kind of methane and non-methane total hydrocarbon content described in specific embodiment 1, wherein, adopt nickel-chromium alloy light source 16 to replace mid-infrared LED3, adopt step The electro-optic modulator 4 is replaced by the external modulation light-blocking sheet 15 fixed on the stepping motor 14 rotating shaft; the splitting prism 7 is removed, and the mid-infrared pyroelectric detector is replaced by a dual-wavelength infrared photodetector 17 8 and a near-infrared photodiode 9;
[0022] With the rotation of the stepping motor 14, the external modulation light blocking sheet 15 periodically blocks the mid-infrared light signal emitted by the nickel-chromium alloy light source 16 with a wavelength of 2-5 um to generate light and dark modulation, which is passed through the main controller 1 Controlling th...
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