CN202057598U - Cavity enhanced detection device for detecting heavy metal content in air - Google Patents
Cavity enhanced detection device for detecting heavy metal content in air Download PDFInfo
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- CN202057598U CN202057598U CN2011201349331U CN201120134933U CN202057598U CN 202057598 U CN202057598 U CN 202057598U CN 2011201349331 U CN2011201349331 U CN 2011201349331U CN 201120134933 U CN201120134933 U CN 201120134933U CN 202057598 U CN202057598 U CN 202057598U
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- spherical reflector
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Abstract
The utility model relates to a cavity enhanced detection device for detecting heavy metal content in air. In the prior art, atomic parts are needed, the structure is complex, fluorescent signals induced by laser are weak, and detection sensitivity is low. In the utility model, the laser oblique incidence cavity enhancing principle is utilized, and two spherical reflectors form an optical stable cavity. A light hole is arranged on the off-axis position of one spherical reflector. A laser beam passes through the small hole to obliquely irradiate into the optical stable cavity and is reflected many times in the optical stable cavity and passes through heavy metal samples in the area, and the heavy metal samples release fluorescence after being stimulated to absorb photons. After the fluorescence is filtered, the fluorescence is collected by a beam converging component arranged on the side surface of the optical stable cavity and is input into a spectra detecting instrument. The spectra detecting instrument detects the intensity of characteristic spectral lines of heavy metal to obtain the heavy metal content in the air. The cavity enhanced content device for detecting the heavy metal detection in the air does not need atomization and has simple system, good stability, high reliability, realizes online in situ detection and high detection sensitivity.
Description
Technical field
The utility model belongs to optical technical field, relate to a kind of device that detects content of beary metal in the air, content of beary metal pick-up unit in the enhanced air of particularly a kind of chamber, the content detection of suspension heavy metal in the air in the fields such as main environment monitoring, energy-saving and emission-reduction, industrial process control.
Background technology
Heavy metal refers generally to atomic density more than or equal to 5 * 10
-3Kg/m
3Metallic element, as mercury, lead, cadmium, chromium, gold, silver, copper etc., have 45 kinds approximately.Toxic heavy metal is meant that some heavy metal enters human body by food, disturbs the human body normal physiological function, is detrimental to health.This class heavy metal mainly contains mercury, chromium, cadmium, lead, zinc, tin etc.For example, lead is the nonessential material of human body, and is easy to enrichment in human body, and is difficult for discharging.Heavy metal pollution is the great environmental problem that Eleventh Five-Year Plan highlights, and " heavy metal pollution integrated control " 12 " planning " obtains State Council's reply, becomes first " 12 " national planning.Content of beary metal detects demand and extensively is present in the fields such as environmental monitoring, energy-saving and emission-reduction, industrial process control.
Formerly in the technology, the detection method of heavy metal is mainly contained atomic absorption spectrography (AAS), atomic emission spectrometry and atomic fluorescence spectrometry.Highly sensitive, characteristics such as selectivity good, good stability that atomic absorption spectrography (AAS) has, but be subjected to chemical serious interference, and repeatability and poor accuracy will be anticipated by sample, will remove residuals after test is finished.Atomic emission spectrometry, have that analysis speed is fast, good reproducibility, can detect advantage such as multiple element simultaneously, disturb, generally be used for the analysis of solid metal more but be subject to chemistry equally, and can tracer liquid based on the emission spectrographic analysis of plasma, but analysis speed be slow.Atomic fluorescence spectrometry has to be analyzed accurately, and selectivity is good, and detection limit is low, and the range of linearity is wide, disturb advantages such as few, but atomic fluorescence spectrometry instrument complex structure needs atomizing apparatus, carry out pre-service to sample.Above method all can not detect content of beary metal in the air on the thronely continuously.In addition, formerly also there is content of beary metal pick-up unit in a kind of air in the technology, referring to a kind of device that detects suspension lead content in the air of patent of invention, the patent No. is ZL200910097973.0, though this invention has certain advantage, but exist essence not enough: the laser beam single is through detected space, and the efficiency of light energy utilization is low; Can be little by the tested zone of the fluorescence of induced with laser, system testing undulatory property as a result is limited; A little less than the fluorescence signal of induced with laser, and by regathering fluorescence signal after the double-sided reflecting mirror reflection, fluorescence signal further weakens.So this invention can't realize the high-sensitivity detection of content of beary metal in the air in itself.
Summary of the invention
The purpose of this utility model is the deficiency at above-mentioned technology, content of beary metal pick-up unit in the enhanced air of a kind of chamber is provided, have efficiency of light energy utilization height, good stability, reliability height, online in-situ monitoring, do not need pre-service and atomization parts, the fluorescence signal of induced with laser is strong, can realize characteristics such as content of beary metal detection in the high sensitivity air.
Basic design of the present utility model is: utilize the laser oblique incidence chamber to strengthen principle, constitute the optical stabilization chamber by two spherical reflectors, the off-axis position of one of them spherical reflector is provided with light hole, laser beam through the small holes oblique incidence in the optical stabilization chamber, repeatedly reflection in the optical stabilization chamber, laser beam discharges fluorescence through the heavy metal sample in the zone after being excited to absorb photon, fluorescence is after filtering, collected by the beam convergence element that side, optical stabilization chamber is provided with, be input in the spectral detection instrument, the spectral detection instrument detects the characteristic spectral line intensity of heavy metal, obtains the content of heavy metal in the air.The method need not that atomization, system are simple, good stability, reliability height, online in situ detection, the detection sensitivity height.
The utility model comprises LASER Light Source, incident spherical reflector, outgoing spherical reflector, lateral reflector, optical filter, beam convergence element, spectral detection instrument.The axis of symmetry of incident spherical reflector and outgoing spherical reflector overlaps and is provided with, and incident spherical reflector and outgoing spherical reflector all are positioned at the sphere inboard, and incident spheric reflection specular reflectivity and outgoing spheric reflection specular reflectivity all are higher than 90%; The sphere curvature radius of incident spherical reflector is R
1, the sphere curvature radius of penetrating spherical reflector is R
2, the reflecting sphere central point spacing of incident spherical reflector and outgoing spherical reflector is d, R
1, R
2Satisfying the pass with d three is 0＜(1-d/R
1) (1-d/R
2)＜1, incident spherical reflector and outgoing spherical reflector constitute the optical stabilization chamber; The off-axis position of incident spherical reflector is provided with light hole, the opposite side relative with outgoing spherical reflector one side of incident spherical reflector is provided with LASER Light Source, the LASER Light Source outgoing beam is through oblique being mapped in the optical stabilization chamber that is made of incident spherical reflector and outgoing spherical reflector of light hole of incident spherical reflector, the axis of symmetry of light hole on the incident spherical reflector and incident spherical reflector and outgoing spherical reflector constitutes tangential plane, and there are angle in LASER Light Source outgoing beam direction and tangential plane; Side one side that incident spherical reflector and outgoing spherical reflector constitute the optical stabilization chamber is disposed with optical filter, beam convergence element and spectral detection instrument coaxially, and the axis of symmetry at optical filter, beam convergence element and spectral detection instrument place and the axis of symmetry in optical stabilization chamber intersect; On the plane of the axis of symmetry decision in the axis of symmetry at optical filter, beam convergence element and spectral detection instrument place and optical stabilization chamber, the side other direction in optical stabilization chamber is provided with lateral reflector.
Light hole diameter on the described incident spherical reflector is greater than LASER Light Source outgoing beam diameter.
The outside dimension of described incident spherical reflector and outgoing spherical reflector is all greater than 20 times of beam diameter.
Described LASER Light Source is a kind of in gas laser, solid-state laser, the dye laser.
Described lateral reflector is a kind of in plane mirror, spherical reflector, cylindrical mirror, the return prism.
Described beam convergence element is a kind of in simple lens, lens arra, the Fresnel Lenses.
Described spectral detection instrument is a kind of of prism spectrometer, grating spectrograph, monochromator, linear array photoelectric sensing spectrometer.
The course of work of the present utility model is: the LASER Light Source outgoing beam is through oblique being mapped in the optical stabilization chamber that is made of incident spherical reflector and outgoing spherical reflector of light hole on the incident spherical reflector.The axis of symmetry of light hole on the incident spherical reflector and incident spherical reflector and outgoing spherical reflector constitutes tangential plane, there are angle in LASER Light Source outgoing beam direction and tangential plane, and incident spheric reflection specular reflectivity and outgoing spheric reflection specular reflectivity all are higher than 90%, laser beam is back and forth propagated in the optical stabilization chamber, and laser beam discharges fluorescence through the heavy metal sample in the zone after being excited to absorb photon.Side one side that incident spherical reflector and outgoing spherical reflector constitute the optical stabilization chamber is disposed with optical filter, beam convergence element and spectral detection instrument coaxially, fluorescence is successively after filtration behind mating plate, the beam convergence element, detected by the spectral detection instrument to receive.On the plane of the axis of symmetry decision in the axis of symmetry at optical filter, beam convergence element and spectral detection instrument place and optical stabilization chamber, the side other direction in optical stabilization chamber is provided with lateral reflector, after the part fluorescence that optical stabilization cavity reflection mirror one side is propagated is reflected mirror reflection, after being horizontally through the optical stabilization chamber, successively after filtration behind mating plate, the beam convergence element, also detected and receive by the spectral detection instrument.The spectral detection instrument obtains the content of heavy metal in the tested regional air by fluorescent characteristics line strength of heavy metal.
The technology of laser fluorescence spectrum principle and spectral detection instrument detected characteristics line strength amalyzing substances content is mature technology in the utility model.Inventive point of the present utility model is to utilize the laser oblique incidence chamber to strengthen principle, constitute the optical stabilization chamber by two spherical reflectors, laser oblique incidence optical stabilization chamber, provide an efficiency of light energy utilization height, good stability, reliability height, online in-situ monitoring, need not pre-service and strong, the highly sensitive air of the fluorescence signal of atomization parts, induced with laser in the content of beary metal pick-up unit.
Compared with prior art, advantage of the present utility model:
1) utilize the laser oblique incidence chamber to strengthen principle, constitute the optical stabilization chamber by two spherical reflectors, laser beam through the small holes oblique incidence in the optical stabilization chamber, repeatedly reflection in the optical stabilization chamber, the laser beam path of induced fluorescence is long, the fluorescence signal that the utility model laser has efficiency of light energy utilization height, induced with laser is strong, can realize that content of beary metal detects in the high sensitivity air.
2) laser-induced fluorescence (LIF) zone is big, and is arranged in the optical stabilization chamber, and the simple and stable structure of the utility model test macro, system reliability and stability is high, workable, do not need the atomization parts, realized online in situ detection.
3) the utility model adopts the offside reflection mirror reflection fluorescent light beam of fluorescence detection direction propagation dorsad, make this part fluorescence also can be by mating plate, beam convergence element after filtration, detected reception by the spectral detection instrument, increase the fluorescence light intensity of collecting, further improved the content of beary metal detection sensitivity.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
As shown in Figure 1, the content of beary metal pick-up unit comprises LASER Light Source 1, incident spherical reflector 2, outgoing spherical reflector 7, lateral reflector 3, optical filter 6, beam convergence element 5, spectral detection instrument 4 in the chamber enhanced air.The axis of symmetry of incident spherical reflector 2 and outgoing spherical reflector 7 overlaps and is provided with, and incident spherical reflector 2 and outgoing spherical reflector 7 all are positioned at the sphere inboard, and incident spherical reflector 2 reflectivity and outgoing spherical reflector 7 reflectivity all are higher than 85%; The sphere curvature radius of incident spherical reflector 2 is R
1, the sphere curvature radius of outgoing spherical reflector 7 is R
2, the reflecting sphere central point spacing of incident spherical reflector 2 and outgoing spherical reflector 7 is d, R
1, R
2Satisfying the pass with d three is 0＜(1-d/R
1) (1-d/R
2)＜1, incident spherical reflector 2 and outgoing spherical reflector 7 constitute the optical stabilization chamber; The off-axis position of incident spherical reflector 2 is provided with light hole, the opposite side relative with outgoing spherical reflector 7 one sides of incident spherical reflector 2 is provided with LASER Light Source 1, LASER Light Source 1 outgoing beam is through oblique being mapped in the optical stabilization chamber that is made of incident spherical reflector 2 and outgoing spherical reflector 7 of light hole of incident spherical reflector 2, the axis of symmetry of light hole on the incident spherical reflector 2 and incident spherical reflector 2 and outgoing spherical reflector 7 constitutes tangential plane, and there are angle in LASER Light Source 1 outgoing beam direction and tangential plane; Side one side that incident spherical reflector 2 and outgoing spherical reflector 7 constitute the optical stabilization chamber is disposed with optical filter 6, beam convergence element 5 and spectral detection instrument 4 coaxially, and the axis of symmetry at optical filter 6, beam convergence element 5 and spectral detection instrument 4 places and the axis of symmetry in optical stabilization chamber intersect; On the plane of the axis of symmetry decision in the axis of symmetry at optical filter 6, beam convergence element 5 and spectral detection instrument 4 places and optical stabilization chamber, the side other direction in optical stabilization chamber is provided with lateral reflector 3.6 pairs of LASER Light Source 1 outgoing beams of optical filter are low transmission, transmitance is less than 10%, and the fluorescence of 6 pairs of induced with laser of optical filter is high permeability, and transmitance is greater than 80%.
LASER Light Source 1 adopts the solid-state laser light source, and it is 2 millimeters that laser goes out 1 irradiating light beam diameter, and lateral reflector 3 is a plane mirror, and beam convergence element 5 is a simple lens, and spectral detection instrument 4 adopts linear array photoelectric sensing spectrometer.The sphere curvature radius of incident spherical reflector 2 is 100 centimetres, and the sphere curvature radius of penetrating spherical reflector 7 is 100 centimetres, and the reflecting sphere central point spacing of incident spherical reflector 2 and outgoing spherical reflector 7 is 50 centimetres.The outside dimension of incident spherical reflector 2 and outgoing spherical reflector 7 is 7 centimetres, and incident spherical reflector 2 and outgoing spherical reflector 7 reflectivity are 95%.
LASER Light Source 1 outgoing beam is through oblique being mapped in the optical stabilization chamber that is made of incident spherical reflector 2 and outgoing spherical reflector 7 of light hole on the incident spherical reflector 2.The axis of symmetry of light hole on the incident spherical reflector 2 and incident spherical reflector 2 and outgoing spherical reflector 7 constitutes tangential plane, there are angle in LASER Light Source 1 outgoing beam direction and tangential plane, and incident spherical reflector 2 reflectivity and outgoing spherical reflector 7 reflectivity all are higher than 90%, laser beam is back and forth propagated in the optical stabilization chamber, and laser beam discharges fluorescence through the heavy metal sample in the zone after being excited to absorb photon.Side one side that incident spherical reflector 2 and outgoing spherical reflector 7 constitute the optical stabilization chamber is disposed with optical filter 6, beam convergence element 5 and spectral detection instrument 4 coaxially, fluorescence is successively after filtration behind mating plate 6, the beam convergence element 5, detected by spectral detection instrument 4 to receive.On the plane of the axis of symmetry decision in the axis of symmetry at optical filter 6, beam convergence element 5 and spectral detection instrument 4 places and optical stabilization chamber, the side other direction in optical stabilization chamber is provided with lateral reflector 3, after the part fluorescence that optical stabilization cavity reflection mirror 3 one sides are propagated is reflected mirror 3 reflections, after being horizontally through the optical stabilization chamber, successively after filtration behind mating plate 6, the beam convergence element 5, also detected and receive by spectral detection instrument 4.Spectral detection instrument 4 obtains the content of heavy metal in the tested regional air by fluorescent characteristics line strength of heavy metal.Present embodiment has completed successfully mercury, lead, chromium 3 heavy metal species content detection.The utlity model has efficiency of light energy utilization height, good stability, reliability height, online in-situ monitoring, need not pre-service and advantage such as the fluorescence signal of atomization parts, induced with laser is strong, sensitivity height.
Claims (7)
1. content of beary metal pick-up unit in the chamber enhanced air, comprise LASER Light Source, incident spherical reflector, outgoing spherical reflector, lateral reflector, optical filter, beam convergence element, spectral detection instrument, it is characterized in that: the axis of symmetry of incident spherical reflector and outgoing spherical reflector overlaps and is provided with, incident spherical reflector and outgoing spherical reflector all are positioned at the sphere inboard, and incident spheric reflection specular reflectivity and outgoing spheric reflection specular reflectivity all are higher than 90%; The sphere curvature radius of incident spherical reflector is R
1, the sphere curvature radius of penetrating spherical reflector is R
2, the reflecting sphere central point spacing of incident spherical reflector and outgoing spherical reflector is d, R
1, R
2Satisfying the pass with d three is 0＜(1-d/R
1) (1-d/R
2)＜1, incident spherical reflector and outgoing spherical reflector constitute the optical stabilization chamber;
The off-axis position of incident spherical reflector is provided with light hole, the opposite side relative with outgoing spherical reflector one side of incident spherical reflector is provided with LASER Light Source, the LASER Light Source outgoing beam is through oblique being mapped in the optical stabilization chamber that is made of incident spherical reflector and outgoing spherical reflector of light hole of incident spherical reflector, the axis of symmetry of light hole on the incident spherical reflector and incident spherical reflector and outgoing spherical reflector constitutes tangential plane, and there are angle in LASER Light Source outgoing beam direction and tangential plane;
Side one side that incident spherical reflector and outgoing spherical reflector constitute the optical stabilization chamber is disposed with optical filter, beam convergence element and spectral detection instrument coaxially, and the axis of symmetry at optical filter, beam convergence element and spectral detection instrument place and the axis of symmetry in optical stabilization chamber intersect; On the plane of the axis of symmetry decision in the axis of symmetry at optical filter, beam convergence element and spectral detection instrument place and optical stabilization chamber, the side other direction in optical stabilization chamber is provided with lateral reflector.
2. content of beary metal pick-up unit in the enhanced air of chamber as claimed in claim 1 is characterized in that: the light hole diameter on the described incident spherical reflector is greater than LASER Light Source outgoing beam diameter.
3. content of beary metal pick-up unit in the enhanced air of chamber as claimed in claim 1 is characterized in that: the outside dimension of described incident spherical reflector and outgoing spherical reflector is all greater than 20 times of beam diameter.
4. content of beary metal pick-up unit in the enhanced air of chamber as claimed in claim 1 is characterized in that: described LASER Light Source is a kind of in gas laser, solid-state laser, the dye laser.
5. content of beary metal pick-up unit in the enhanced air of chamber as claimed in claim 1 is characterized in that: described lateral reflector is a kind of in plane mirror, spherical reflector, cylindrical mirror, the return prism.
6. content of beary metal pick-up unit in the enhanced air of chamber as claimed in claim 1 is characterized in that: described beam convergence element is a kind of in simple lens, lens arra, the Fresnel Lenses.
7. content of beary metal pick-up unit in the enhanced air of chamber as claimed in claim 1 is characterized in that: described spectral detection instrument is a kind of of prism spectrometer, grating spectrograph, monochromator, linear array photoelectric sensing spectrometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201349331U CN202057598U (en) | 2011-05-03 | 2011-05-03 | Cavity enhanced detection device for detecting heavy metal content in air |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201349331U CN202057598U (en) | 2011-05-03 | 2011-05-03 | Cavity enhanced detection device for detecting heavy metal content in air |
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| CN202057598U true CN202057598U (en) | 2011-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011201349331U Expired - Lifetime CN202057598U (en) | 2011-05-03 | 2011-05-03 | Cavity enhanced detection device for detecting heavy metal content in air |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253020A (en) * | 2011-05-03 | 2011-11-23 | 杭州电子科技大学 | Cavity enhanced detection apparatus for heavy metal content in air |
| CN106198471A (en) * | 2016-05-06 | 2016-12-07 | 黄辉 | A kind of bio-chemical fluorescent analyser based on light-conducting capillaries and detection method thereof |
-
2011
- 2011-05-03 CN CN2011201349331U patent/CN202057598U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253020A (en) * | 2011-05-03 | 2011-11-23 | 杭州电子科技大学 | Cavity enhanced detection apparatus for heavy metal content in air |
| CN102253020B (en) * | 2011-05-03 | 2012-12-05 | 杭州电子科技大学 | Cavity enhanced detection apparatus for heavy metal content in air |
| CN106198471A (en) * | 2016-05-06 | 2016-12-07 | 黄辉 | A kind of bio-chemical fluorescent analyser based on light-conducting capillaries and detection method thereof |
| CN106198471B (en) * | 2016-05-06 | 2019-04-09 | 黄辉 | A kind of bio-chemical fluorescent analyzer and its detection method based on light-conducting capillaries |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20111130 Effective date of abandoning: 20130306 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20111130 Effective date of abandoning: 20130306 |
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| RGAV | Abandon patent right to avoid regrant |