CN204594864U - Based on the Trace Hg concentration detection apparatus of optical fiber-coupled laser with frequency technology - Google Patents
Based on the Trace Hg concentration detection apparatus of optical fiber-coupled laser with frequency technology Download PDFInfo
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- CN204594864U CN204594864U CN201520095880.5U CN201520095880U CN204594864U CN 204594864 U CN204594864 U CN 204594864U CN 201520095880 U CN201520095880 U CN 201520095880U CN 204594864 U CN204594864 U CN 204594864U
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Abstract
The utility model discloses a kind of based on the Trace Hg concentration detection apparatus of optical fiber-coupled laser with frequency technology.Its device comprises data collecting card, and two laser diodes drive, the diode laser of the different wave length of two band tail optical fibers, draw axicon lens optical fiber for 1 point 2, BBO Crystal (BBO), quartz lens, Amici prism, two-face mirror, spectroscope, reference cell, sample cell, two photomultipliers, two filter plates, computing machine.The technology contained mainly arithmetic of linearity regression, automatic circuit controls wavelength feedback technique, achieves and detects the on-line continuous of mercury vapour concentration.
Description
Technical field
The utility model belongs to the detection field of elemental mercury concentration in industrial discharge flue gas inspection industrial discharge flue gas, is specifically related to a kind of based on the Trace Hg concentration detection apparatus of optical fiber-coupled laser with frequency technology.
Background technology
Mercury is a kind of element be harmful to very much human body.Take in mercury and too much easily cause body illness, and have very large infringement to nervous system.Mercury in air mainly from manual emission with naturally discharge.Naturally discharge mainly comprises lake volatilization and volcanic explosion.Manual emission is mainly from the discharge of industrial smoke.The energy of China is mainly from burning of coal, and the mercury containing high level in the colliery of China.Thus, the mercuryvapour in fume emission is the main source of China's mercury pollution.Traditional mercury vapor survey technology adopts wet chemistry method.Although this method has very high sensitivity, length consuming time, cannot as real-time monitoring means.In optical means, again with cold-vapour atomic absorption method and cold-atomic fluorescence spectrometry comparatively common.The device of cold-vapour atomic absorption method uses mercury lamp as light source, calculates the concentration of mercuryvapour with the absorptivity of corresponding spectral line.Although this method is simple and easy to do, problem is also very outstanding, and the serviceable life comprising (1) mercury lamp is short, generally only has 2000 hours; (2) luminous power of mercury lamp is unstable, and the mercury concentration gone out in prediction on such basis has comparatively big error.Cold-atomic fluorescence spectrometry uses mercury lamp as light source equally, thus also has above two shortcomings.Simultaneously because fluorescence has requirement to mercuryvapour density, thus generally also to be equipped with gas enriching apparatus, namely also need in use to be equipped with carrier gas (being generally argon gas).Mercury concentration based on Zeeman effect is measured, and is equivalent to carry reference arm, thus can evade the impact that mercury lamp changed power brings, but the problem in mercury lamp life-span does not solve equally.
The patent No. is ZL201210055105, disclose a kind of mercury vapour continuous monitoring device based on diode laser and monitoring method, its shortcoming comprises: (1) system is responsive to vibrations, the twisting of light source, catoptron, achromat all can reduce coupling efficiency and then reduce the power of synthesizing ultraviolet, thus reduces system sensitivity; (2) simultaneously, owing to adopting two to look mirror, the pattern size of laser beam is not mated, and system ultraviolet light combined coefficient is low; (3), when adopting data collection and analysis device calculating concentration, only choose indivedual point and carry out I/I
ocalculate, cannot continuous acquisition data, easy reduction accuracy affected by noise; (4) signal generator adds the volume of analytic system as separate modular; (5) system does not arrange close-loop feedback, cannot return optimum condition by Automatic adjusument when wave length shift appears in laser instrument, needs manually to arrange, and reduces the automatic measurement ability of system.
Utility model content
1, the purpose of this utility model.
For above deficiency, the utility model proposes a kind of based on the Trace Hg concentration detection apparatus of optical fiber-coupled laser with frequency technology.
2, the technical scheme that adopts of the utility model.
Based on the device of optical fiber-coupled laser with the Trace Hg Concentration Testing of frequency technology, comprise data collecting card (1), two laser diodes drive (2-1, 2-2), a bbo crystal (5), an Amici prism (7), two two-face mirror (8-1, 8-2), a spectroscope (9), reference cell (10-1), sample cell (10-2), two filter plate (11-1, 11-2), detector (12-1, 12-2), also comprise the diode laser (3-1 of the different wave length of two band tail optical fibers, 3-2), draw axicon lens optical fiber (4) for 1 point 2, wherein the single head end of 1 point of 2 lens fiber carries lens, a quartzy collimation lens (6), two diode laser (3-1, light 3-2) exported is directly coupled in the double end end of 1 point of 2 lens fiber (4), focus point is beaten at bbo crystal on the surface, three-beam will be there is after bbo crystal, ruddiness, blue light and the ultraviolet light produced after bbo crystal (5), three-beam collimates after quartzy collimation lens (6), again after Amici prism (7), because dispersion separates, wherein ultraviolet light changes direction through catoptron, light is divided into two bundles after spectroscope, first is entered respectively by after filter plate again respectively by after reference cell and sample cell, second detector (12-1, 12-2).
The two-way simulating signal that data collecting card exports, one tunnel is saw wave modulator signal or triangular signal, frequency range 10 ~ 10kHz, control red laser diode and drive (2-2), thus modulation red laser (3-2) output wavelength and light intensity, another road fine setting blue laser diode drives (2-1), thus regulates blue laser (3-1) to go out emission mode.
Blue laser output power is not less than 10mW, and red laser output power is not less than 20mW.
The output wavelength λ of two laser instruments
1, λ
2meet 1/ λ
1+ 1/ λ
2the relation of=1/253.7, wherein, the unit of wavelength is nanometer (nm).
First, second detector (12-1,12-2) is photomultiplier.
Draw for 1 point 2 axicon lens optical fiber (4) to use material to be fused quartz, two-way splitting ratio is 50:50, draws axicon lens fiber-optic output focal length 5 ~ 25mm.
Reference cell length is 1 ~ 10mm, and mercury vapor inside concentration and reference cell length product are 10 ~ 100 μ g/m
2, sample cell length is 1 ~ 0.1m, and concrete length changes according to measuring accuracy.
3, the beneficial effects of the utility model.
(1), owing to have employed diode laser, thus the life-span is long more a lot of than the mobile metal device based on mercury lamp;
(2), owing to using pigtailed laser diode and 1 point 2 to draw axicon lens optical fiber, i.e. optical coupling structure, make the outgoing mould spot size of two bundle laser identical, after focusing on bbo crystal, farthest meet phase-matching condition, thus greatly improve the output power of ultraviolet light;
(3), owing to using pigtailed laser diode and 1 point 2 to draw axicon lens optical fiber can focus the light into certain distance (5 ~ 25mm) before fiber exit end, control focus at bbo crystal on the surface exactly, make system more stable, the impact shaken can be avoided to a certain extent;
(4), adopt data collecting card can Quick Acquisition continuously, make system per secondly can provide real-time concentration data, reduce the impact of noise on measurement result;
(5), data collecting card has concurrently and produces signal and data acquisition function, decreases the volume of system, is also convenient to compare to original signal and feedback signal simultaneously, obtain measurement data;
The lowest detectable limit that the utility model reaches is lower than 1ug/m
3, the response time, lower than 10s, fully meets the requirement of mercury content Real-Time Monitoring in industrial gas emission, is applicable to the field of in industrial gaseous waste, mercury vapour discharge being carried out to Real-Time Monitoring.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 blue line and green line are the two-way original signal obtained of sampling, and red line is the original light intensity of matching.
Fig. 3 is the relative absorbance on reference arm and the sample road calculated.
Fig. 4 is the implementation process of multiple linear regression.
1-data collecting card, 2-1 blue laser diode drives, and 2-2 red laser diode drives, 3-1 blue diode laser, 3-2 red diode laser, 4-draws axicon lens optical fiber for 1 point 2,5-bbo crystal, 6-quartz collimation lens, 7-Amici prism, 8-1 first catoptron, 8-2 second catoptron, 9-spectroscope, 10-1 reference cell, 10-2 sample cell, 11-1 first filter plate, 11-2 second filter plate, 12-1 first detector, 12-2 second detector, 13-computing machine.
Embodiment
In order to enable the auditor of Patent Office especially the public clearly understand technical spirit of the present utility model and beneficial effect, applicant will elaborate below by way of example, but not all the restriction to the utility model scheme to the description of embodiment, any according to being only pro forma but not substantial equivalent transformation and all should being considered as the technical solution of the utility model category done by the utility model design.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.As shown in Figure 1, the data collecting card 1 that the utility model patent adopts should have two-way synchronous acquisition and two-way modulating output function.Acquisition function can pass through computer programming.The two-way simulating signal that data collecting card exports, a road is saw wave modulator signal or triangular signal, frequency range 10 ~ 10kHz, controls red laser and drives 2-2, change the Injection Current of laser instrument thus modulated laser 3-2 output wavelength and light intensity with this.The fine-tuning blue laser in another road drives 2-1, thus regulates blue laser 3-1 to go out emission mode.
The wavelength of two laser instruments meets the following conditions:
Wherein
,
be the wavelength of two diode lasers, unit is nanometer.As 405 nanometers and 677 nanometers.
The light of two laser diode outputs is directly coupled to 1 point 2 and draws in the double end end of axicon lens optical fiber 4.Draw for 1 point 2 the single head end of axicon lens optical fiber 4 to carry lens, certain distance (5 ~ 25mm) before fiber exit end can be focused the light into.
Focus point is accurately beaten at bbo crystal 5 on the surface.Three-beam will be there is, ruddiness, blue light and the ultraviolet light produced after bbo crystal after bbo crystal.Three-beam collimates after fused quartz lens 6.Again after Amici prism 7 because dispersion separates.Wherein ultraviolet light changes direction through catoptron 8-1, makes light path folding in limited chassis space.The fixed mount of reflective mirror is coated with black matt material, plays the effect of light isolation simultaneously, can block red light and blue light, makes system more integrated.Light is divided into two bundles after spectroscope 9, respectively by reference cell 10-1 and sample cell 10-2.Two-beam line again respectively by filter plate 11 laggard enter photomultiplier 12 be detected.
Reference cell 10-1 length is 2 ~ 4mm, and mercury vapor inside concentration and reference cell length product are 20 ~ 60ug/m
2.
Sample cell 10-2 length is 20 ~ 2m, and concrete length changes according to measuring accuracy.
The signal that photomultiplier 12 produces is received by data collecting card 1 and is sent to computing machine 13 and carries out data processing, and specific algorithm is described below.
(1) two-way original signal still presents sawtooth wave, but there will be the absorption peak varied in size in the same position of sawtooth.First matching is carried out to two paths of signals non-absorbent regions, obtain original light intensity signal, as shown in Figure 2.
(2) original light intensity signal and original signal are subtracted each other, and obtain normalization absorption signal, as shown in Figure 3.
(3) multiple linear regression is carried out to normalized signal, obtain the ratio of absorption signal relative reference road, sample road absorption signal, as shown in Figure 4.Multiple linear regression process is as follows:
S=A
1R+A
2+A
3X
The wherein normalization absorption signal on S representative sample road, R represents the normalization absorption signal of reference arm, and X represents window X-axis coordinate.A
1, A
2, A
3for best-fit parameter.
(4) by the parameter A of gained
1, the concentration information C of sample is calculated according to following formula
sam
Wherein L
reffor reference gas chamber length, L
samfor sample air chamber length, C
reffor the concentration of mercury vapour in reference gas chamber.
System can carry out feedback regulation to the electric current of blue light laser diode.When the normalization absorption signal of reference arm is less than 10%, capture card scans to the Injection Current of blue light laser diode, regulates blue light wavelength, namely regulates the wavelength of synthesizing ultraviolet, thus changes the size of absorption peak.The reference arm absorption peak size that the program that system carries obtains under will recording different input current situation, and input current when Selective absorber peak is maximum after the end of scan re-enters in blue laser diode driving.
Claims (7)
1. based on the device of optical fiber-coupled laser with the Trace Hg Concentration Testing of frequency technology, comprise data collecting card (1), two laser diodes drive (2-1,2-2), a bbo crystal (5), an Amici prism (7), two two-face mirror (8-1,8-2), a spectroscope (9), reference cell (10-1), sample cell (10-2), two filter plate (11-1,11-2), detector (12-1,12-2), is characterized in that:
Also comprise the diode laser (3-1,3-2) of the different wave length of two band tail optical fibers, 1 point 2 is drawn axicon lens optical fiber (4), and wherein the single head end of 1 point of 2 lens fiber carries lens, a quartzy collimation lens (6);
Two diode laser (3-1, light 3-2) exported is directly coupled in the double end end of 1 point of 2 lens fiber (4), focus point is beaten at bbo crystal on the surface, three-beam will be there is after bbo crystal, ruddiness, blue light and the ultraviolet light produced after bbo crystal (5), three-beam collimates after quartzy collimation lens (6), again after Amici prism (7), because dispersion separates, wherein ultraviolet light changes direction through catoptron, light is divided into two bundles after spectroscope, first is entered respectively by after filter plate again respectively by after reference cell and sample cell, second detector (12-1, 12-2).
2. according to claim 1 based on the device of optical fiber-coupled laser with the Trace Hg Concentration Testing of frequency technology, it is characterized in that: the two-way simulating signal that data collecting card exports, one tunnel is saw wave modulator signal or triangular signal, frequency range 10 ~ 10kHz, control red laser diode and drive (2-2), thus modulation red laser (3-2) output wavelength and light intensity, another road fine setting blue laser diode drives (2-1), thus regulates blue laser (3-1) to go out emission mode.
3. according to claim 1 and 2 based on the device of optical fiber-coupled laser with the Trace Hg Concentration Testing of frequency technology, it is characterized in that: blue laser output power is not less than 10mW, red laser output power is not less than 20mW.
4. according to claim 1 and 2 based on the device of optical fiber-coupled laser with the Trace Hg Concentration Testing of frequency technology, it is characterized in that: the output wavelength λ of two laser instruments
1, λ
2meet 1/ λ
1+ 1/ λ
2the relation of=1/253.7, wherein, the unit of wavelength is nanometer.
5. according to claim 1 based on the device of optical fiber-coupled laser with the Trace Hg Concentration Testing of frequency technology, it is characterized in that: first, second detector (12-1,12-2) is photomultiplier.
6. according to claim 1 based on the device of optical fiber-coupled laser with the Trace Hg Concentration Testing of frequency technology, it is characterized in that: 1 point 2 is drawn axicon lens optical fiber (4) to use material to be fused quartz, two-way splitting ratio is 50:50, draws axicon lens fiber-optic output focal length 5 ~ 25mm.
7. according to claim 1 based on the device of optical fiber-coupled laser with the Trace Hg Concentration Testing of frequency technology, it is characterized in that: reference cell length is 1 ~ 10mm, mercury vapor inside concentration and reference cell length product are 10 ~ 100 μ g/m
2, sample cell length is 0.1 ~ 1m, and concrete length changes according to measuring accuracy.
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|---|---|---|---|
| CN201520095880.5U CN204594864U (en) | 2015-02-11 | 2015-02-11 | Based on the Trace Hg concentration detection apparatus of optical fiber-coupled laser with frequency technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105987877A (en) * | 2015-02-11 | 2016-10-05 | 苏州瑞蓝环保科技有限公司 | Optical fiber-coupled laser sum frequency technology-based trace mercury concentration detection method and device |
-
2015
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105987877A (en) * | 2015-02-11 | 2016-10-05 | 苏州瑞蓝环保科技有限公司 | Optical fiber-coupled laser sum frequency technology-based trace mercury concentration detection method and device |
| CN105987877B (en) * | 2015-02-11 | 2019-08-13 | 苏州瑞蓝环保科技有限公司 | Trace Hg concentration detection method and device based on optical fiber-coupled laser and frequency technology |
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| GR01 | Patent grant | ||
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Granted publication date: 20150826 Termination date: 20180211 |
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| CF01 | Termination of patent right due to non-payment of annual fee |