A kind of flue gas automonitor that transmits and receives signal based on optical fiber
[technical field]:
The invention belongs to flue gas automatic monitoring technical field, specifically a kind of flue gas automonitor according to absorption spectrum measurement gas composition.
[background technology]:
In the monitoring of flue emission gases, can adopt the point type instrument to sample and analyze, but the space-time representativeness of this method sampling is relatively poor, and a point type monitoring instrument generally can only be monitored a kind of gas.Utilize the Differential Optical Absorption Spectroscopy of line sample mode to measure emission gases in the flue, measurement range is big, can realize that many components measure, and real-time online measuring continuously.Therefore, this method becomes the ideal tools of environmental pollution monitoring gradually.
Be subjected to the restriction of the common optical system structure of forming of lens and catoptron, in the flue gas automatic checkout system based on absorption spectrum, light source, flue gas probe, spectrometer can only be integrated the formula structure at present.During measurement, need flue gas probe is inserted flue, other parts link to each other with flue gas probe, directly are placed on the walling of flue.The whole measuring system parts are many, volume and weight is big, brought very big difficulty to installation and maintenance; Light source and spectrometer all are sealed in the dustproof casing, are unfavorable for heat radiation, and system's stability requirement of environment temperature to external world is very high; And, very high request has been proposed for the anticorrosion and protection of parts because institute's survey flue has stronger corrosivity usually.
[summary of the invention]:
The objective of the invention is to solve existing flue gas automonitor complex structure, installation and maintenance difficulty based on absorption spectrum, instrument is anticorrosion and the demanding problem of dispelling the heat, and a kind of flue gas automonitor that transmits and receives signal based on optical fiber is provided.
Provided by the inventionly transmit and receive the flue gas automonitor of signal, comprise light source 1, optical fiber coupled lens 2, launching fiber 3, receive optical fiber 4, collimation lens 5, prism of corner cube 6 and spectrometer 7 based on optical fiber.The continuous spectrum that light source 1 sends arrives launching fiber 3 incident ends through optical fiber coupled lens 2, after the exit end of launching fiber 3 penetrates, parallel ejaculation behind collimation lens 5 collimations, angle of arrival cone prism 6 backs are reflected along former direction, after focusing on, same collimation lens 6 enters reception optical fiber once more, after receive and send into spectrometer 7 after optical fiber 4 exit ends penetrate, carry out spectral detection by spectrometer 7.
Described light source, flue gas probe, spectrometer are absolute construction, carry out the signal transmission by launching fiber and reception optical fiber.Flue gas probe is made of collimation lens and prism of corner cube and the lens barrel of fixing them.
Advantage of the present invention and good effect: provided by the inventionly transmit and receive the flue gas automonitor of signal, light source and spectrometer can be independent of flue gas probe, by launching fiber with receive optical fiber and carry out the signal transmission based on optical fiber.Flue gas probe inserts in the flue, and light source and spectrometer are placed in and flue distance zone far away, thereby has reduced the weight of former monoblock type instrument, is beneficial to installation, safeguards and dustproof and heat radiation.Simultaneously, provided by the inventionly transmit and receive the flue gas automonitor of signal, reduced the quantity of optical lens and catoptron, simplified light path, the signal to noise ratio (S/N ratio) that helps adjusting instrument and improve photoelectric detecting signal based on optical fiber.
[description of drawings]:
Fig. 1 is the flue gas automonitor structural representation that transmits and receives signal based on optical fiber provided by the invention.
[embodiment]:
Embodiment 1
What Figure 1 shows that present embodiment provides transmits and receives the flue gas automonitor of signal based on optical fiber, and this instrument comprises light source 1, optical fiber coupled lens 2, launching fiber 3, receives optical fiber 4, collimation lens 5, prism of corner cube 6 and spectrometer 7.
During measurement, the continuous spectrum that is sent by light source 1 is coupled to launching fiber 3 incident ends through optical fiber coupled lens 2, after launching fiber transmission back is by its exit end ejaculation, parallel ejaculation behind collimation lens 5 collimations, angle of arrival cone prism 6 backs are reflected along former direction, after same collimation lens 5 focuses on, enter once more and receive optical fiber 4,, carry out spectral detection by spectrometer after reception optical fiber is sent into spectrometer after penetrating.But spectrometer obtains the concentration of gas in the flue according to the characteristic absorption spectrum inverting of gas.Described light source, flue gas probe, spectrometer are absolute construction, carry out the signal transmission by launching fiber and reception optical fiber.