CN206038530U - Gaseous state elemental mercury concentration detection device based on wavelength modulation technique - Google Patents
Gaseous state elemental mercury concentration detection device based on wavelength modulation technique Download PDFInfo
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- CN206038530U CN206038530U CN201620921262.6U CN201620921262U CN206038530U CN 206038530 U CN206038530 U CN 206038530U CN 201620921262 U CN201620921262 U CN 201620921262U CN 206038530 U CN206038530 U CN 206038530U
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- concentration detection
- wavelength
- modulation technique
- mercury concentration
- detection apparatus
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Abstract
The utility model discloses a gaseous state elemental mercury concentration detection device based on wavelength modulation technique, include: barium metaborate crystal, convex lens, prism, red light semiconductor laser, blue photosemiconductor laser instrument, dichromatic are to mirror, achromatism convex lens, ultraviolet high reflective mirror, air chamber, photomultiplier, lock -in amplifier and signal control analysor, the electric current and the temperature control output of signal control analysor are connected respectively the electric current and the temperature control input of red light semiconductor laser and blue photosemiconductor laser instrument. In this way, gaseous state elemental mercury concentration detection device based on wavelength modulation technique, use wavelength modulation and lock -in amplifier technique, with frequency translation to the high -frequency wave section of detectable signal to reduced the influence of low -frequency noise, improved the detection precision, required to hang down to system's arithmetic capability, the easy realization.
Description
Technical field
The utility model is related to industrial mercury emissions on-line monitoring field, more particularly to a kind of based on wavelength-modulation technique
Gaseous elementary mercury concentration detection apparatus.
Background technology
Mercury is a kind of chemical substance very harmful to nervous system and liver, and the mercury pollution 30% in air from
The waste gas discharge of anthropogenic discharge, particularly Hazards in Power Plant.In order to reduce mercury to environment and the adverse effect of human health, 2013
Year is endorsed jointly including more than 100 countries including China《With regard to the Minamata pact of mercury》.
The real-time oversight for either discharging to industrial mercury vapour effective assessment still to demercuration efficiency, accurately and efficiently surveys
Mercury technology is all indispensable.Traditional mobile metal technology adopts Ontario method, belongs to wet chemistry method, and this method has
Very high sensitivity, but need long-time to react, it is impossible to obtain real-time mercury element concentration information.At present, maturation on market
Mercury vapour concentration on-line real time monitoring product is all based on optical principle, mainly includes cold atomic absorption spectrometry and Cold Atomic Fluorescent Mercury
Spectroscopic methodology.Both technologies adopt mercury lamp as light source, but the service life of mercury lamp is short（2000 hours）, cause system
Maintenance frequency is high, and cost is also high.
The patent of invention of Patent No. ZL201210055105, discloses a kind of mercury vapour based on diode laser and continuously supervises
Survey device and monitoring method, it is possible to achieve the concentration real-time continuous of elemental mercury from vapor are monitored, but this set system has one and asks
Topic, i.e., be in low frequency to the modulating frequency of laser instrument, easily affected by ambient noise, cause signal to noise ratio not high enough, detects
The limit is not low enough.
Utility model content
The utility model is mainly solving the technical problems that a kind of gaseous elementary mercury based on wavelength-modulation technique of offer is dense
Degree detection means, causes maintenance cost high for the light source life short-range missile faced by the existing mercury vapour monitoring technology based on mercury lamp
Problem, the signal to noise ratio faced by the existing mercury vapour monitoring technology based on frequency laser of solution is not high enough and detectable limit is inadequate
Low problem.
For solving above-mentioned technical problem, the technical scheme that the utility model is adopted is：There is provided a kind of based on wavelength tune
The gaseous elementary mercury concentration detection apparatus of technology processed, including：BBO Crystal, convex lens and prism, the convex lens set
Put between BBO Crystal and prism, the gaseous elementary mercury concentration detection apparatus based on wavelength-modulation technique are also wrapped
Red light semiconductor laser, blue semiconductor laser, two colors are included to mirror, achromatic convex lens, ultraviolet high reflective mirror, air chamber, light
Electric multiplier tube, lock-in amplifier and signal control analyzer, electric current and the temperature control output end of the signal control analyzer
Connect electric current and the temperature control input end of the red light semiconductor laser and blue semiconductor laser, the blue light respectively
Bis- colors of light beam Jing that semiconductor laser sends reflect the first light beam, the light beam that the red light semiconductor laser sends to mirror
Bis- colors of Jing transmit the second light beam to mirror, and the achromatic convex lens is arranged on two colors and causes between mirror and BBO Crystal
First light beam and the second light beam overlap and focus on BBO Crystal center, the ultraviolet height after beating on achromatic convex lens
Anti- mirror is arranged on prism side so that the ultraviolet high reflective mirrors of ultraviolet light Jing that prism dispersion goes out are reflected through air chamber, the air chamber
It is arranged between photomultiplier and ultraviolet high reflective mirror, the electrical signal of the photomultiplier and the electricity of lock-in amplifier
Signal input part is connected, and the output end of the lock-in amplifier is connected with the receiving terminal of signal control analyzer.
In one preferred embodiment of the utility model, the control electric current of the red light semiconductor laser is by two kinds of signals
It is formed by stacking, a kind of is triangular wave, and frequency is in 1 ~ 20Hz；A kind of is sine wave, and in 1kHz ~ 20kHz, amplitude is triangular wave to frequency
0.1 ~ 0.5 times of amplitude.
In one preferred embodiment of the utility model, the frequency of phase locking of the lock-in amplifier is red light semiconductor laser
2 times of sine wave freuqency in the control electric current of device.
In one preferred embodiment of the utility model, the ultraviolet high reflective mirror is not less than in 253 ~ 255nm reflectivity
95%, reflectivity is less than 10% at the 395 ~ 415nm and 650 ~ 710nm.
In one preferred embodiment of the utility model, the convex lens are JGS1 vitreous silica convex lens.
In one preferred embodiment of the utility model, the prism is JGS1 vitreous silica prisms.
In one preferred embodiment of the utility model, ultraviolet interference filter on the photosurface of the photomultiplier, is provided with
Mating plate.
In one preferred embodiment of the utility model, the H103 resin half-peak breadth of the UV interference filters is less than
At 20nm, 254nm, transmitance is more than 10%, and the transmitance at 395 ~ 415nm and 650 ~ 710nm is less than 0.01%.
In one preferred embodiment of the utility model, the photomultiplier is blind type photomultiplier, its detection
The output photoelectric of device flows through the responsiveness after resistance is amplified at 254 nm and is more than 100 mV/nW, and three dB bandwidth is more than 20kHz.
In one preferred embodiment of the utility model, quilt after the emergent light planoconvex lens collimation of the BBO Crystal
Prism light splitting is divided into three beams, is followed successively by ruddiness, blue light and ultraviolet light.
The beneficial effects of the utility model are：A kind of elementary gas based on wavelength-modulation technique that the utility model is pointed out
Mercury concentration detection apparatus, are modulated using wavelength and phase lock amplifying technology, by the frequency translation of detectable signal to high frequency band, so as to
The impact of low-frequency noise is reduced, signal to noise ratio is improve, accuracy of detection is improve, using the output direct correlation of lock-in amplifier
Concentration, algorithm are simple, low to system operations Capability Requirement, easily realize, the gaseous elementary mercury LDL that can be reached is low
In 0.1 μ g/m3, the response time is less than 10s, meets the requirement of mercury content real-time monitoring in industrial gas emission, it is adaptable to industry
Mercury vapour discharge real-time monitoring field.
Description of the drawings
For the technical scheme being illustrated more clearly that in the utility model embodiment, below will be to needed for embodiment description
Accompanying drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some realities of the present utility model
Example is applied, for those of ordinary skill in the art, on the premise of not paying creative work, can be with according to these accompanying drawings
Other accompanying drawings are obtained, wherein：
Fig. 1 is that a kind of gaseous elementary mercury concentration detection apparatus one based on wavelength-modulation technique of the utility model are preferably implemented
The structural representation of example.
Specific embodiment
Technical scheme in the utility model embodiment will be clearly and completely described below, it is clear that described
Embodiment is only a part of embodiment of the present utility model, rather than the embodiment of whole.Based on the enforcement in the utility model
Example, all other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made are belonged to
The scope of the utility model protection.
Fig. 1 is referred to, the utility model embodiment includes：
A kind of gaseous elementary mercury concentration detection apparatus based on wavelength-modulation technique, including：BBO Crystal 5, convex lens
Mirror 6 and prism 7, the convex lens 6 are arranged between BBO Crystal 5 and prism 7, described based on wavelength-modulation technique
Gaseous elementary mercury concentration detection apparatus also include red light semiconductor laser 1, blue semiconductor laser 2, two colors to mirror 3,
Achromatic convex lens 4, ultraviolet high reflective mirror 8, air chamber 9, photomultiplier 10, lock-in amplifier and 11 signal control analyzer 12,
Reflectivity of the ultraviolet high reflective mirror 8 in 253.7nm is not less than 95%, and reflectivity is little at the 395 ~ 415nm and 650 ~ 710nm
In 10%.
The electric current of the signal control analyzer 12 is connected the red light semiconductor laser respectively with temperature control output end
The electric current and temperature control input end of device 1 and blue semiconductor laser 2, the light beam that the blue semiconductor laser 2 sends
Bis- colors of Jing reflect the first light beam to mirror 3, and bis- colors of light beam Jing that the red light semiconductor laser 1 sends transmit to mirror 3
Two light beams, the achromatic convex lens 4 be arranged on two colors between mirror 3 and BBO Crystal 5 cause the first light beam and second
Light beam overlaps and focuses on 5 center of BBO Crystal after beating on achromatic convex lens 4, and the ultraviolet high reflective mirror 8 is arranged on
7 side of prism causes the ultraviolet high reflective mirrors of the ultraviolet light Jing that prism dispersion goes out 8 to be reflected through air chamber 9, and the air chamber 9 is arranged on
Between photomultiplier 10 and ultraviolet high reflective mirror 8, in air chamber 9, under test gas are filled with.
The electrical signal of the photomultiplier 10 is connected with the electric signal input end of lock-in amplifier 11, described
Photomultiplier 10 is blind type photomultiplier, and the output photoelectric of its detector flows through the sound after resistance is amplified at 254 nm
Should rate be more than 100 mV/nW, three dB bandwidth be more than 20kHz.Photomultiplier 10 converts optical signal into electric signal and is transported to lock
In phase amplifier 11, the output end of the lock-in amplifier 11 is connected with the receiving terminal of signal control analyzer 12.Lock is mutually put
Big 11 output signal of device is gathered and working process by signal control analyzer 12, finally gives elemental mercury from vapor concentration.
Operation principle：Signal control analyzer 12 is supplied to 1 one low frequency triangular waves of red light semiconductor laser and high frequency
The superposed signal of sine wave, low frequency triangular wave frequency are 1 ~ 20Hz, and major function is to adjust laser instrument output by adjusting electric current
Wavelength, high frequency sinusoidal wave frequency rate, are 1k ~ 20kHz, and amplitude is for, in the range of 0.1 ~ 0.5 times of triangle wave amplitude, major function is right
Laser instrument output carries out high frequency modulated.The control electric current of blue laser 2 is constant current.Red light semiconductor laser 1 is in scanning
During, output wavelength λ at central current intensity1With 2 output wavelength λ of blue laser2There is following relation：
The unit of wavelength is nanometer.
The Laser Focusing that two beams overlap is in BBO Crystal 5（Bbo crystal）Center, and in BBO Crystal 5
Complete and frequency transfer process, generate the Ultra-Violet Laser of wavelength 253.7nm.The effect of achromatic convex lens 4 is by ruddiness and blue light
Laser Focusing improves the space optical power density of fundamental frequency light, so as to improve and frequency conversion efficiency to a bit.BBO Crystal 5
The light beam of outgoing below includes ruddiness, three wavelength of blue light and ultraviolet light, collimates through convex lens 6, then through 7 dispersion of prism
Afterwards, only ultraviolet light is reflected by ultraviolet high reflective mirror 8, and by air chamber 9, is finally received by photomultiplier 10, photomultiplier 10
Electric signal demodulate through lock-in amplifier 11, and calculate mercury vapour concentration in signal control analyzer 12.
The material of the convex lens 6 and prism 7 is JGS1 vitreous silicas.JGS1 vitreous silicas are with four chlorination of liquid
Silicon is directly fused into high-quality optical quartz glass in high-purity oxyhydrogen flame, can accomplish complete bubble-free, with excellent
Saturating ultraviolet performance, particularly in short wavelength UV area, its through performance surpasses every other glass far away, at 185m μ
Transmitance is up to 85%, optical good, and transmitance is high.
Be provided with UV interference filters on the photosurface of the photomultiplier 10, the UV interference filters it is saturating
Curve half-peak breadth is crossed less than 20nm, transmitance is more than 10% at 254nm, and the transmitance at 395 ~ 415nm and 650 ~ 710nm is less than
0.01%。
Embodiment 1：A kind of gaseous elementary mercury concentration detection apparatus based on wavelength-modulation technique measure sample as follows
Mercury vapour concentration in product gas pond：
Step one, is filled with test gas in air chamber 9, obtains secondary harmonic amplitude A0；
Step 2, calculates normal concentration line according to following formula：
C=kA
0
+b
The best fit parameters that wherein k and b are obtained when being calibration, C are the concentration of mercury vapour in air chamber.
In sum, a kind of gaseous elementary mercury Concentration Testing based on wavelength-modulation technique that the utility model is pointed out is filled
Put, improve signal to noise ratio and accuracy of detection, meet the requirement of mercury content real-time monitoring in industrial gas emission.
Embodiment of the present utility model is the foregoing is only, the scope of the claims of the present utility model is not thereby limited, it is every
The equivalent structure made using the utility model description or equivalent flow conversion, or directly or indirectly it is used in other phases
The technical field of pass, is included in scope of patent protection of the present utility model in the same manner.
Claims (10)
1. a kind of gaseous elementary mercury concentration detection apparatus based on wavelength-modulation technique, including：BBO Crystal, convex lens and
Prism, the convex lens are arranged between BBO Crystal and prism, it is characterised in that described to modulate skill based on wavelength
The gaseous elementary mercury concentration detection apparatus of art also include red light semiconductor laser, blue semiconductor laser, two colors to mirror, disappear
Aberration convex lens, ultraviolet high reflective mirror, air chamber, photomultiplier, lock-in amplifier and signal control analyzer, the signal control
The electric current of analyzer and temperature control output end are connected the red light semiconductor laser and blue semiconductor laser respectively
Electric current and temperature control input end, bis- colors of light beam Jing that the blue semiconductor laser sends reflect the first light beam to mirror,
Bis- colors of light beam Jing that the red light semiconductor laser sends transmit the second light beam to mirror, and the achromatic convex lens is arranged on
Two colors are poly- to after causing the first light beam and the second light beam to overlap and beat on achromatic convex lens between mirror and BBO Crystal
Burnt to arrive BBO Crystal center, the ultraviolet high reflective mirror is arranged on prism side so that the ultraviolet light Jing that goes out of prism dispersion
Ultraviolet high reflective mirror is reflected through air chamber, and the air chamber is arranged between photomultiplier and ultraviolet high reflective mirror, the photomultiplier transit
The electrical signal of pipe is connected with the electric signal input end of lock-in amplifier, the output end of the lock-in amplifier and signal
The receiving terminal of control analyzer is connected.
2. gaseous elementary mercury concentration detection apparatus based on wavelength-modulation technique according to claim 1, it is characterised in that
The control electric current of the red light semiconductor laser is formed by two kinds of Signal averagings, and a kind of is triangular wave, and frequency is in 1 ~ 20Hz；One
It is sine wave to plant, and frequency is in 1kHz ~ 20kHz, 0.1 ~ 0.5 times for triangle wave amplitude of amplitude.
3. gaseous elementary mercury concentration detection apparatus based on wavelength-modulation technique according to claim 2, it is characterised in that
2 times for sine wave freuqency in the control electric current of red light semiconductor laser of the frequency of phase locking of the lock-in amplifier.
4. gaseous elementary mercury concentration detection apparatus based on wavelength-modulation technique according to claim 1, it is characterised in that
The ultraviolet high reflective mirror is not less than 95% in 253 ~ 255nm reflectivity, and reflectivity is less than at the 395 ~ 415nm and 650 ~ 710nm
10%。
5. gaseous elementary mercury concentration detection apparatus based on wavelength-modulation technique according to claim 1, it is characterised in that
The convex lens are JGS1 vitreous silica convex lens.
6. gaseous elementary mercury concentration detection apparatus based on wavelength-modulation technique according to claim 1, it is characterised in that
The prism is JGS1 vitreous silica prisms.
7. gaseous elementary mercury concentration detection apparatus based on wavelength-modulation technique according to claim 1, it is characterised in that
UV interference filters are provided with the photosurface of the photomultiplier.
8. gaseous elementary mercury concentration detection apparatus based on wavelength-modulation technique according to claim 7, it is characterised in that
The H103 resin half-peak breadth of the UV interference filters be less than 20nm, 254nm at transmitance be more than 10%, 395 ~ 415nm with
Transmitance at 650 ~ 710nm is less than 0.01%.
9. gaseous elementary mercury concentration detection apparatus based on wavelength-modulation technique according to claim 1, it is characterised in that
The photomultiplier is blind type photomultiplier, and the output photoelectric of its detector is flowed through after resistance is amplified at 254 nm
Responsiveness is more than 100 mV/nW, and three dB bandwidth is more than 20kHz.
10. gaseous elementary mercury concentration detection apparatus based on wavelength-modulation technique according to claim 1, its feature exist
In the emergent light planoconvex lens of the BBO Crystal is divided into three beams by prism light splitting after collimating, and is followed successively by ruddiness, blue light
And ultraviolet light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620921262.6U CN206038530U (en) | 2016-08-23 | 2016-08-23 | Gaseous state elemental mercury concentration detection device based on wavelength modulation technique |
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|---|---|---|---|
| CN201620921262.6U CN206038530U (en) | 2016-08-23 | 2016-08-23 | Gaseous state elemental mercury concentration detection device based on wavelength modulation technique |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109239009A (en) * | 2018-09-03 | 2019-01-18 | 杭州电子科技大学 | Gaseous mercury concentration detection apparatus and method based on ring resonator frequency multiplication structure |
| CN114136899A (en) * | 2020-09-04 | 2022-03-04 | 富士电机株式会社 | Gas analyzer |
-
2016
- 2016-08-23 CN CN201620921262.6U patent/CN206038530U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109239009A (en) * | 2018-09-03 | 2019-01-18 | 杭州电子科技大学 | Gaseous mercury concentration detection apparatus and method based on ring resonator frequency multiplication structure |
| CN114136899A (en) * | 2020-09-04 | 2022-03-04 | 富士电机株式会社 | Gas analyzer |
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