CN102778439B - Multiple-light-emitting-diode (LED) combined wideband light source device applied to difference absorption spectrum system - Google Patents
Multiple-light-emitting-diode (LED) combined wideband light source device applied to difference absorption spectrum system Download PDFInfo
- Publication number
- CN102778439B CN102778439B CN201210217116.1A CN201210217116A CN102778439B CN 102778439 B CN102778439 B CN 102778439B CN 201210217116 A CN201210217116 A CN 201210217116A CN 102778439 B CN102778439 B CN 102778439B
- Authority
- CN
- China
- Prior art keywords
- light source
- optical fiber
- transmitting
- fiber
- receiving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
A multiple-light-emitting-diode (LED) combined wideband light source device applied to a difference absorption spectrum system is composed of three ultraviolet LED light sources, a non-spherical single lens and an optical fiber bundle capable of spitting into four optical fibers. Ultraviolet LEDs used by the multiple-LED combined wideband light source device have the advantages of being small in size, light in weight, long in service life, less in power consumption, convenient to replace and the like. In addition, the LEDs are connected with the optical fiber bundle capable of spitting into four optical fibers and the non-spherical single lens, so that the utilization rate of the light is greatly increased. Besides, the multiple-LED combined wideband light source device solves the problem of inconvenient multicomponent measurement due to the narrow single LED band and lays a foundation for the difference absorption spectrum system which is developed towards the direction of being low cost and power consumption, long in service life and easy to maintain in the future.
Description
Technical field
The invention belongs to a kind of optical measurement field, be specially a kind of device of many LED combined type wideband light source of difference absorption spectrum system, be applied to monitor the difference absorption spectrum system of Atmospheric Trace dusty gas.
Background technology
At present, the conventional wideband light source of difference absorption spectrum measuring system is xenon lamp, deuterium lamp.Xenon lamp is kind of a Photoelectric Light that is filled with high-pressure xenon, can send very strong ultraviolet ray.Lamp internal pressure is high, has certain potential safety hazard.Its luminous wave band: 180-2000nm, luminous wide waveband, easily causes parasitic light to enter detector; Oxygen in the strong ultraviolet light meeting ionized air of transmitting produces O
3thereby, disturb O
3mensuration and jeopardize human health; Power consumption is large, and luminescence efficiency is lower, and most energy dissipate in hot mode, causes the waste of the energy; The unstable atom emission line interference monitoring producing; The height that trigger voltage is suitable, can reach 30KV, and electron device is caused to electromagnetic interference (EMI).
Deuterium lamp utilizes the continuous spectrum of D2 discharge generation 170-400nm wave band.Wherein wrap radiation spectrum ozoniferous, the O of generation
3can in 220-280nm region, form and absorb, the mobile meeting of outside ozone brings fluctuation and the noise of optical radiation in addition.Meanwhile, the O that xenon lamp, deuterium lamp produce
3can be oxidized the surface coating of optical element, the life-span of reducing optical device.
In recent years, LED, as a kind of novel ultraviolet source, applies to spectrographic detection field gradually.Compare with conventional ultraviolet source, its quality is light, and volume is little, and power consumption is low and heat radiation is few, long service life, and spectrum efficient stable, sturdy and durable, and there is not potential safety hazard.But LED spectrum is class Gaussian shaped like narrow, full width at half maximum is in 10-20nm left and right.According to the requirement of difference absorption spectrum technology inverting, the single led monitoring that often meets only one-component.In addition, domestic and international existing ultraviolet LED power is very low, and from tens milliwatts to several watts, luminous power is low, and how improving the ultraviolet LED efficiency of light energy utilization is a great problem.Problem in the face of above-mentioned light source exists, requires a kind of more efficient, energy-conservation, stable combined type wideband light source system applies in difference absorption spectrum measuring system.
Summary of the invention
The technology of the present invention is dealt with problems: for the defect of commonly using the existence of ultraviolet source, a kind of many LED combined type broad band light source device of difference absorption spectrum system is provided, the volume that has solved conventional ultraviolet source existence is large, big energy-consuming, life-span is short, unstable and the single led bands of a spectrum of spectrum are too narrow, and the problem such as light intensity is weak.
Technical solution of the present invention: a kind of many LED combined type broad band light source device that is applied to difference absorption spectrum system, by the ultraviolet LED light source of three kinds of different-wavebands, aspheric surface simple lens, and one minute four fibre bundle forms.The light that ultraviolet LED sends is coupled into three launching fibers through aspheric surface simple lens respectively, by being positioned at transmitting-receiving fiber end face on telescope primary mirror focal plane, combining after being emitted to telescope primary mirror and collimate outgoing, after atmosphere, by the retroeflection of Jiao Fanjingyuan road, finally convergence to central optical fiber (receiving optical fiber) the lead-in light spectrometer of receiving and dispatching fiber end face carries out spectral analysis.
Within described one minute, four fibre bundles are comprised of the transmitting-receiving optical fiber of 19 cores, the launching fiber of the reception optical fiber of 1 core, three 6 cores.Three launching fibers are 365nm with centre wavelength successively, 295nm, and the ultraviolet LED coupling of 280nm, as shown in Figure 2.Reception optical fiber and three 6 core launching fibers are followed successively by 1:6:6:6 at transmitting-receiving inside of optical fibre distribution proportion, and concrete arrangement mode as shown in Figure 2.Centered by reception optical fiber, be dicyclo and arrange, interior ring is 6 cores, and outer shroud is 12 cores, and 6 cores of launching fiber 7 are arranged in outer shroud, and launching fiber 8,96 cores are separately 3:3 at interior ring and the outer shroud ratio of arranging.
Described a kind of many LED combined type broad band light source device that is applied to difference absorption spectrum system, is characterized in that: three kinds of different wave band LED light sources, combine with specific one minute four fibre bundles; The transmitting-receiving fiber end face of one minute four fibre bundle is equivalent to the wideband light source being combined by three kinds of different-waveband narrow-band LEDs, can realize three kinds of dusty gas NO simultaneously
2, SO
2, O
3monitoring.Wherein, the ultraviolet LED light source that centre wavelength is 280nm, for monitoring atmosphere trace contamination gas O
3, the ultraviolet LED light source that centre wavelength is 295nm, for monitoring atmosphere trace contamination gas SO
2, the ultraviolet LED light source that centre wavelength is 365nm, for monitoring atmosphere trace contamination gas NO
2;
The angle of divergence of described LED light source is very large (120 degree) generally, adopts spherical lens, is difficult to reach good focusing effect, and adopts multi-disc lens, not only complicated on space structure, and multi-disc lens can reduce the efficiency of light energy utilization.This device adopts aspheric surface simple lens to improve coupling efficiency, and it is better to large visual field system imaging quality, and single aspheric surface has accurately been proofreaied and correct spherical aberration, even if sake is also sphere accurately, light beam is intersected at a point exactly, and lens attenuation, optical system structure simplified.
The present invention compared with prior art advantage is:
(1) three kinds of different-waveband ultraviolet LED light sources of the present invention, combine with one minute four fibre bundle and aspheric surface simple lens, the transmitting-receiving fiber end face of one minute four fibre bundle has formed a kind of wideband light source being combined by three kinds of different-waveband narrow-band LEDs, overcome the single led problem that only can realize single dusty gas monitoring because luminous wave band is narrower, can meet multiple trace gas (as: NO in atmosphere simultaneously
2, SO
2, O
3) monitoring.
(2) the present invention adopts ultraviolet LED as light source, and with the xenon lamp of traditional DOAS system, deuterium lamp is compared, and has volume little, and quality is light, and the life-span is long, consumes energy little, and heat radiation is few, use safer, change simpler, the advantage such as maintenance cost is low.From the angle of environmental protection, more environmental protection of ultraviolet LED, energy-conservation.Be that difference absorption spectrum system is laid a good foundation to low cost, low-power consumption, life-span future development long, easy care from now on simultaneously.
(3) the aspheric surface simple lens that the present invention adopts, it is better to large visual field system imaging quality; Single aspheric surface has accurately been proofreaied and correct spherical aberration, even if sake is also sphere accurately, light beam is intersected at a point exactly, has improved coupling efficiency.
(4) the present invention adopts many LED to combine with fibre bundle, and telescope is only reduced to by primary mirror, and the anti-mirror in fibre bundle and angle forms, compare with traditional Cassegrain telescope, light path is more stable, adjusts more simple and conveniently, and causes light loss to reduce by optical element.
Accompanying drawing explanation
Fig. 1 is a kind of many LED combined type broad band light source device schematic diagram that is applied to difference absorption spectrum system of the present invention;
Fig. 2 is one minute four fiber bundle structure schematic diagram of the present invention;
Fig. 3 is the preposition aspheric surface simple lens of LED of the present invention;
The conventional atmosphere pollution NO of Fig. 4
2, SO
2, O
3difference Absorption structural representation.
Embodiment
The present invention is a kind of to be applied in many LED combined type broad band light source device design process of difference absorption spectrum system, not only to consider to select the LED of suitable wave band to meet the requirement of difference absorption spectrum systematic survey, and to consider how in optics and optical fiber design, to reach the efficient coupling of light, and a plurality of LED are combined as to wideband light source.
A kind of many LED combined type broad band light source device that is applied to difference absorption spectrum system provided by the invention, as shown in Figure 1, is followed successively by 365nm by centre wavelength, 295nm, the ultraviolet LED 1,2 of three kinds of different-wavebands of 280nm, 3, aspheric surface simple lens 4,5,6, and one minute four fibre bundle 7,8,9,10,11 form.Ultraviolet LED 1,2,3 light that send are respectively through aspheric surface simple lens 4,5,6 are coupled into three launching fibers 7,8,9, by transmitting-receiving optical fiber 11 end faces that are positioned on telescope primary mirror 14 focal planes, combine transmitting, to the rear collimation outgoing of telescope primary mirror 14, after atmosphere, by angle anti-Jing15Yuan road retroeflection, the reception optical fiber 10 that retroreflection light is received and dispatched optical fiber 11 end face centers receives and lead-in light spectrometer 12, forms a kind of many LED combined type wideband light source.
LED spectrum is class Gaussian, and full width at half maximum is in 10-20nm left and right.According to the requirement of difference absorption spectrum technology inverting, the single led requirement that often meets only a kind of dusty gas monitoring.The scheme that adopts one minute four fibre bundle to combine with many LED in the present invention, selects respectively the LED of suitable wave band according to the characteristic absorption wave band of pollutant to be measured, by one minute four fibre bundle, be combined as wideband light source.
Fig. 4 is the conventional pollutant NO of atmosphere
2, SO
2, O
3the Difference Absorption structural representation at ultraviolet band, X-axis is wavelength, unit: nanometer (nm); Y-axis is the absorption cross section of gas, unit: square centimeter per molecule (cm
2/ molecule).With reference to the absorption cross section of figure 4 each gases, ultraviolet LED selected in the present invention is respectively: the ultraviolet LED light source that centre wavelength is 280nm, full width at half maximum: 275-285nm, can be satisfied with atmospheric trace gas O
3monitoring requirement; Centre wavelength is the ultraviolet LED light source of 295nm, and full width at half maximum: 290-300nm can be satisfied with atmospheric trace gas SO
2monitoring requirement; Centre wavelength is the ultraviolet LED light source of 365nm, and full width at half maximum: 360-370nm can be satisfied with atmospheric trace gas NO
2monitoring requirement.
One minute four fibre bundle as designed in Fig. 2 by the transmitting-receiving optical fiber 11 of 19 cores, the launching fiber 7,8,9 of the reception optical fiber of 1 core 10, three 6 cores form.Three launching fibers 7,8,9 are 365nm with centre wavelength successively, 295nm, the ultraviolet LED coupling of 280nm.The end face that is so positioned at the transmitting-receiving optical fiber 11 on primary mirror focal plane has just formed a kind of wideband light source being combined by the narrow-band LED of three kinds of different-wavebands, can realize three kinds of dusty gas NO simultaneously
2, SO
2, O
3monitoring.
In the present invention, ultraviolet LED light source used is subject to the restriction of existing LED technique, and power is very low, is only that tens milliwatts arrive several watts, and the coupling efficiency that how to improve light in the design of preposition convergent lens is the key point of successful Application ultraviolet LED.The ultraviolet LED light source angle of divergence is very large (approximately 120 degree) generally, if adopt spherical lens, is difficult to reach good focusing effect, and adopts multi-disc lens, not only complicated on space structure, and multi-disc lens can bring more light loss.But aspheric surface simple lens is different, and its single aspheric surface is spherical aberration corrector accurately, even if sake is also the sphere of standard, light beam is intersected at a point exactly, and lens thickness attenuation, optical system structure is simple, so adopting aspheric surface simple lens is the best mode that improves coupling efficiency.As Fig. 3 shows, the light beam 1 that ultraviolet LED sends focuses on 1: 3 after aspheric surface simple lens 2, and focal position 3 is placed launching fiber.
In addition, between three kinds of different-waveband LED that adopt, light intensity also there are differences, by light intensity successively sort ascending: the ultraviolet LED that centre wavelength is 280nm, the ultraviolet LED that centre wavelength is 295nm, the ultraviolet LED that centre wavelength is 365nm.The above two are on an order of magnitude, and the latter is the above two hundreds of times.Therefore when the design of fibre bundle, take into full account this point.One minute four fibre bundle by the transmitting-receiving optical fiber 11 of 19 cores, the launching fiber 7,8,9 of the reception optical fiber of 1 core 10, three 6 cores form.Three launching fibers 7,8,9 are 365nm with centre wavelength successively, 295nm, the ultraviolet LED coupling of 280nm.As shown in Figure 2,1 core receives 10, three 6 core launching fibers 7,8,9 of optical fiber and is followed successively by 1:6:6:6 at the distribution proportion of transmitting-receiving inside of optical fibre.The end face of transmitting-receiving optical fiber 11 presents twin nuclei, and centered by 1 core receives optical fiber 10, interior ring is 6 cores, and outer shroud is 12 cores, and wherein, 6 cores of launching fiber 7 are all arranged in outer shroud, and launching fiber 8,96 cores are separately 3:3 at interior ring and the outer shroud ratio of arranging.The difference that the corresponding launching fiber of different LED is arranged at interior ring and outer shroud can directly have influence on the size of the retroeflection signal that central optical fiber receives.Wherein, the light of interior ring outgoing more has superiority when receiving retroeflection signal.Because the centre wavelength ultraviolet LED that is 280nm and the centre wavelength ultraviolet LED light intensity that is 295nm is on an order of magnitude, and the ultraviolet LED that centre wavelength is 365nm is their hundreds of times.Therefore,, in optical fiber design, need to pay the utmost attention to the retroeflection signal magnitude of the ultraviolet LED that ultraviolet LED that centre wavelength is 280nm and centre wavelength are 295nm.The interior ring of the end face of transmitting-receiving optical fiber 11 is 6 cores, and both corresponding launching fibers respectively account for half, 3:3, and all the other launching fibers 7 corresponding with the ultraviolet LED that centre wavelength is 365nm are consistent, are arranged in outer shroud.In addition, apparatus of the present invention LED used is ultraviolet band, in order to reduce the loss of light in fibre bundle, adopts the anti-reflection quartz of ultraviolet as the material of fibre bundle.
The applied difference absorption spectrum system of the present invention is to carry out the tested gas concentration of inverting based on DOAS algorithm.During retrieving concentration, need to compose to obtain Difference Absorption optical density (OD) according to the atmosphere spectrum and the lamp that measure.Therefore there are following two kinds of mode of operations in a kind of many LED combined type broad band light source device that is applied to difference absorption spectrum system of the present invention:
Surveying under atmospherical model, the light that ultraviolet LED sends is coupled into three launching fibers 7 through aspheric surface simple lens respectively, 8,9, by being positioned at transmitting-receiving optical fiber 11 end faces on telescope primary mirror 14 focal planes, combining and be emitted to the rear collimation outgoing of telescope primary mirror 14, after atmosphere, by anti-Jing15Yuan road, angle, reflected, finally assemble to the central optical fiber 10 of receiving and dispatching optical fiber 11 end faces, receive optical fiber lead-in light spectrometer 12, obtain the spectrum that contains Atmospheric Absorption.
Surveying under lamp pattern, the diffuse reflector 13 in transmitting-receiving optical fiber 11 the place aheads rises, and the light of receiving and dispatching optical fiber 11 end faces transmittings is reflected into the reception optical fiber 10 lead-in light spectrometers 12 at transmitting-receiving optical fiber 11 end face centers by diffuse reflector 13, do not obtain and compose containing " totally " lamp of Atmospheric Absorption.
Claims (3)
1. the many LED combined type broad band light source device that is applied to difference absorption spectrum system, is characterized in that: the ultraviolet LED light source of three kinds of different-wavebands, three aspheric surface simple lenses and one minute four fibre bundle, consist of; Wherein said three kinds of different wave band ultraviolet LED light sources are respectively that centre wavelength is the ultraviolet LED light source that the ultraviolet LED light source of 280nm, ultraviolet LED light source that centre wavelength is 295nm and centre wavelength are 365nm; Described centre wavelength is the ultraviolet LED light source of 280nm, for monitoring atmosphere trace contamination gas O
3, the ultraviolet LED light source that centre wavelength is 295nm, for monitoring atmosphere trace contamination gas SO
2, the ultraviolet LED light source that centre wavelength is 365nm, for monitoring atmosphere trace contamination gas NO
2; Within described one minute, four fibre bundles are comprised of launching fiber, reception optical fiber and transmitting-receiving optical fiber three parts, and wherein launching fiber is three, and the ultraviolet LED light source of respectively corresponding three kinds of different-wavebands receives optical fiber and each of transmitting-receiving optical fiber; The end face of every launching fiber is positioned at separately in the signal-lens focus of aspheric surface, and transmitting-receiving fiber end face is positioned on the focal plane of telescope primary mirror, receives the center that optical fiber one end is positioned at transmitting-receiving fiber end face, and the other end is connected with spectrometer; The light that the ultraviolet LED light source of three kinds of different-wavebands sends is coupled into launching fiber separately through aspheric surface simple lens separately respectively, by the transmitting-receiving fiber end face being positioned on telescope primary mirror focal plane, combine transmitting, the reception of reception optical fiber the lead-in light spectrometer that by the light of the anti-mirror retroeflection in angle, are positioned at transmitting-receiving end centre of optic fibre, form a kind of many LED combined type wideband light source;
Within described one minute, four fibre bundles are comprised of the transmitting-receiving optical fiber of 19 cores, the launching fiber of the reception optical fiber of 1 core, three 6 cores; The ultraviolet LED light source of described three kinds of different-wavebands is coupled with three launching fibers respectively; 1 core receives optical fiber, and three 6 core launching fibers are followed successively by 1:6:6:6 at the distribution proportion of transmitting-receiving inside of optical fibre; The end face of transmitting-receiving optical fiber presents twin nuclei, and centered by 1 core receives optical fiber, interior ring is 6 cores, outer shroud is 12 cores, wherein, 6 cores of a launching fiber are all arranged in outer shroud, and all the other two launching fibers 6 cores are separately 3:3 at interior ring and the outer shroud ratio of arranging.
2. a kind of many LED combined type broad band light source device that is applied to difference absorption spectrum system according to claim 1, is characterized in that: the material of described one minute four fibre bundles is the anti-reflection quartz of ultraviolet.
3. a kind of many LED combined type broad band light source device that is applied to difference absorption spectrum system according to claim 1, it is characterized in that: described broad band light source device has two kinds of mode of operations: the one, surveying under atmospherical model, the light that three kinds of different-waveband ultraviolet LEDs send is coupled into three launching fibers through aspheric surface simple lens separately respectively, by being positioned at transmitting-receiving fiber end face on telescope primary mirror focal plane, combining after being emitted to telescope primary mirror and collimate outgoing, after atmosphere, by the retroeflection of Jiao Fanjingyuan road, finally assemble to the central optical fiber of receiving and dispatching fiber end face, receive optical fiber lead-in light spectrometer and carry out spectral analysis, the 2nd, surveying under lamp pattern, the diffuse reflector in transmitting-receiving fiber end face the place ahead rises, the light that three kinds of different-waveband ultraviolet LEDs send is coupled into three launching fibers through aspheric surface simple lens separately respectively, by being positioned at transmitting-receiving fiber end face on telescope primary mirror focal plane, combining after being emitted to diffuse reflector and entered central optical fiber by diffuse reflection, receive optical fiber, lead-in light spectrometer, does not obtain and composes containing the clean lamp of Atmospheric Absorption.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210217116.1A CN102778439B (en) | 2012-06-28 | 2012-06-28 | Multiple-light-emitting-diode (LED) combined wideband light source device applied to difference absorption spectrum system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210217116.1A CN102778439B (en) | 2012-06-28 | 2012-06-28 | Multiple-light-emitting-diode (LED) combined wideband light source device applied to difference absorption spectrum system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102778439A CN102778439A (en) | 2012-11-14 |
| CN102778439B true CN102778439B (en) | 2014-08-27 |
Family
ID=47123422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210217116.1A Active CN102778439B (en) | 2012-06-28 | 2012-06-28 | Multiple-light-emitting-diode (LED) combined wideband light source device applied to difference absorption spectrum system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102778439B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104181133A (en) * | 2013-05-24 | 2014-12-03 | 南开大学 | Multi-wavelength capillary electrophoresis fluorescence excitation device |
| FI20130195L (en) * | 2013-07-03 | 2015-01-04 | Growth Curves Ab Ltd Oy | A method to achieve broadband and uniform efficient LED light |
| CN110056808B (en) * | 2018-01-18 | 2021-02-09 | 深圳市绎立锐光科技开发有限公司 | Laser light emitting device |
| CN108931489B (en) * | 2018-09-10 | 2020-12-22 | 复旦大学 | Differential absorption spectrum system for measuring concentration of glyoxal in atmosphere based on LED light source |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002093142A1 (en) * | 2001-05-16 | 2002-11-21 | X-Rite, Incorporated | Color measurement instrument with modulated illumination |
| CN1906440A (en) * | 2003-12-02 | 2007-01-31 | 3M创新有限公司 | LED modifying apparatus and method |
| CN101248335A (en) * | 2005-03-14 | 2008-08-20 | 数据色彩控股股份公司 | Spectrophotometer with light emitting diode illuminator |
| CN201973575U (en) * | 2011-01-14 | 2011-09-14 | 苏州生物医学工程技术研究所 | Multispectral compact type LED (light-emitting diode) all solid-state optical source system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020145728A1 (en) * | 2001-04-06 | 2002-10-10 | Speedfam-Ipec Corporation | Method and apparatus for a spectrally stable light source using white light LEDs |
-
2012
- 2012-06-28 CN CN201210217116.1A patent/CN102778439B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002093142A1 (en) * | 2001-05-16 | 2002-11-21 | X-Rite, Incorporated | Color measurement instrument with modulated illumination |
| CN1906440A (en) * | 2003-12-02 | 2007-01-31 | 3M创新有限公司 | LED modifying apparatus and method |
| CN101248335A (en) * | 2005-03-14 | 2008-08-20 | 数据色彩控股股份公司 | Spectrophotometer with light emitting diode illuminator |
| CN201973575U (en) * | 2011-01-14 | 2011-09-14 | 苏州生物医学工程技术研究所 | Multispectral compact type LED (light-emitting diode) all solid-state optical source system |
Non-Patent Citations (4)
| Title |
|---|
| 发光二极管在差分吸收光谱系统中的应用研究;李素文等;《物理学报》;20080330;第57卷(第3期);第1963-1966页 * |
| 李素文等.发光二极管在差分吸收光谱系统中的应用研究.《物理学报》.2008,第57卷(第3期), |
| 谢品华等.长程差分吸收光谱技术探测大气痕量成分.《中国气象学会2006年年会论文集》.2006, |
| 长程差分吸收光谱技术探测大气痕量成分;谢品华等;《中国气象学会2006年年会论文集》;20061231;第45-47页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102778439A (en) | 2012-11-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106525742B (en) | Gas concentration monitoring method, apparatus and system | |
| CN102778439B (en) | Multiple-light-emitting-diode (LED) combined wideband light source device applied to difference absorption spectrum system | |
| CN102661938B (en) | Method and device of stimulated emission depletion (STED) microscopy based on tangential polarized light | |
| CN101368872B (en) | LED luminous flux measurement apparatus and method | |
| Merten et al. | Design of differential optical absorption spectroscopy long-path telescopes based on fiber optics | |
| Arnaoutakis et al. | Coupling of sunlight into optical fibres and spectral dependence for solar energy applications | |
| CN103176226A (en) | Dodging special-shaped lens used for shaping semiconductor laser leams, dodging laser source and optical system | |
| CN103629574B (en) | A kind of many Multi-LED combination broadband light source based on many ribs reflection cone | |
| CN109270006A (en) | More light path air absorbing cavities and its trace gas measuring system | |
| CN104237898A (en) | Natural gas leakage telemetering laser radar | |
| CN105571834A (en) | Measuring device of quantum efficiency of CCD device | |
| CN107884353A (en) | A kind of gas absorption cell light channel structure suitable for fume continuous monitoring system | |
| CN108398402A (en) | More light path air absorbing cavities and its trace gas measuring system | |
| CN203745364U (en) | Optical system with high energy utilization rate for flue gas concentration analyzer | |
| JP2012094247A (en) | Solar simulator | |
| Kumar et al. | Efficient sunlight harvesting with combined system of large Fresnel lens segmented mirror reflectors and compound parabolic concentrator without tracking sun for indoor daylight illumination | |
| CN203101668U (en) | Dodging lens, dodging laser light source and optical system used for shaping semiconductor laser beam | |
| CN110470393B (en) | Long-distance wide-spectrum weak signal collecting system based on large-aperture Fresnel lens | |
| CN202548051U (en) | Reflection cavity for odd-numbered and even-numbered optical paths | |
| CN101303457A (en) | Light beam collimation uniform method of wave front recombination and light source system thereof | |
| CN102913817B (en) | The light source device of a kind of radar-probing system | |
| CN207571018U (en) | A kind of gas absorption cell light channel structure suitable for fume continuous monitoring system | |
| CN201204381Y (en) | Combination device for semiconductor laser | |
| CN107941665A (en) | A kind of high-resolution aerosol particle diameter survey meter | |
| CN210347443U (en) | Environment atmospheric characteristic gas monitor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |