CN101248335A - Spectrophotometer with light emitting diode illuminator - Google Patents
Spectrophotometer with light emitting diode illuminator Download PDFInfo
- Publication number
- CN101248335A CN101248335A CNA2006800083953A CN200680008395A CN101248335A CN 101248335 A CN101248335 A CN 101248335A CN A2006800083953 A CNA2006800083953 A CN A2006800083953A CN 200680008395 A CN200680008395 A CN 200680008395A CN 101248335 A CN101248335 A CN 101248335A
- Authority
- CN
- China
- Prior art keywords
- spectrophotometer
- light
- emitting diode
- light emitting
- sample
- 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.)
- Pending
Links
Images
Abstract
The invention relates to a spectrophotometer with light emitting diode illuminator. In one embodiment, the invention is spectrophotometer with a light emitting diode illuminator. In one embodiment, a spectrophotometer for characterizing a reflectance spectrum of a specimen includes an optical assembly for illuminating the specimen, where the optical assembly includes at least one light emitting diode. A measurement head is coupled to the optical assembly for collecting light reflected by the specimen, and a spectrum analyzer is coupled to the measurement head for performing spectral analysis of the collected light into a plurality of spectral bands. A reference channel provides illumination from the optical assembly to the spectrum analyzer, while a test channel provides the collected light from the measurement head to the spectrum analyzer.
Description
Technical field
The present invention relates generally to spectrophotometer, and more specifically, relate to the light source that in spectrophotometer, uses.
Background technology
Spectrophotometer uses in a lot of industries usually, to measure the intensity as the function of color, perhaps more specifically, measures light wavelength.Usually, the light source that the spectrophotometer utilization is demarcated to sample (this sample or reflection or transmission) throw light on, measure the light of reflection then, with the feature of performance sample reflectance spectrum.
Traditional spectrophotometer adopts the pulsed-xenon light sources sample that throws light on.Although this light source is often quite reliable when suitably safeguarding and filtering, they are still relevant with a lot of defectives.For example,, produce dangerous voltage because pulsed-xenon light sources is relatively large, awfully hot in use and have electronic noise, so their often are difficult to physically operation.Angle from technology, they are often still very slow (for example, owing to trigger recharging of back capacitor), unsettled (for example, plasma is that geometry is unsettled, make to be difficult to energy easily is coupled in the optical fiber optical device), variable (for example, may in flicker, produce different spectral power distribution), (for example experience inaccurate optical filtering, often do not match with required spectral power distribution) and be difficult to closely couple (for example, owing to high pulse energy) with optical device.In addition, owing to need filter in order to obtain a plurality of desirable illumination spectrums, so this equipment is very expensive.All these defectives are often relevant with the equipment that has the short life-span usually.
Some spectrophotometer has comprised light emitting diode (LED) light source, to solve the some shortcomings relevant with pulsed-xenon light sources.Yet in this configuration, because the LED type " is opened " usually one by one, each LED that therefore constitutes light source only can produce a spectral measurement.In addition, to the performance of the feature of sample reflectance spectrum may since LED spectrum (when their intensity changes, can experience complicated variation usually) twist to the transmission of analytical equipment.
Therefore, need a kind of improved, spectrophotometer with LED luminaire in the present technique field, it allows more accurate measurement of the reflectance spectrum of sample and feature performance.
Summary of the invention
In one embodiment, the present invention is the spectrophotometer with light emitting diode illuminator.In one embodiment, the spectrophotometer of feature that is used to show the reflectance spectrum of sample comprises the optical module of this sample that is used to throw light on, and wherein this optical module comprises at least one light emitting diode.Measuring head is couple on the optical module, and collecting the light of sample reflection, and spectroanalysis instrument is couple to this measuring head, to carry out collected light is assigned to the spectral analysis of a plurality of bands.Reference channel will offer spectroanalysis instrument from the illumination of optical module, and test channel will offer spectroanalysis instrument from the collected light of measuring head.
Description of drawings
Consider following detailed description in conjunction with the drawings, the content of teaching shown in the present can be more readily understood, wherein:
Fig. 1 is the synoptic diagram that is used to illustrate according to a spectrophotometric embodiment of the present invention;
Fig. 2 is the synoptic diagram that is used to illustrate an embodiment of LED optical module shown in Figure 1;
Fig. 3 is the synoptic diagram that is used to illustrate according to spectrophotometric another embodiment of the present invention; And
Fig. 4 is the synoptic diagram of an embodiment of the luminaire that can dispose easily according to the present invention.
For the ease of understanding, under possible situation, use the identical public in the accompanying drawings similar elements of Reference numeral indication.
Embodiment
In one embodiment, the present invention is the spectrophotometer with LED luminaire.Embodiments of the invention provide and use led light source rather than the xenon light source spectrophotometer of sample that throws light on, thereby have showed the advantage aspect cost, reliability and physics practicality.In addition, spectrophotometer can resolve light reflected by the specimen into a plurality of bands, the wherein quantity of the band restriction of LED quantity of sample that is not used to throw light on.
Fig. 1 is the synoptic diagram that is used to illustrate according to an embodiment of spectrophotometer 100 of the present invention.Spectrophotometer 100 generally includes light emitting diode (LED) optical module 102, measuring head 104 and spectroanalysis instrument 106.
LED optical module 102 is installed to mechanical fabricated section 108, and mechanical fabricated section 108 is couple to the power supply (not shown) that electric energy is provided to the LED optical module again.LED optical module 102 also is couple to measuring head 104, and is used for providing illumination to measuring head 104.
Measuring head 104 is configured to the light that directing LED optics assembly 102 is provided, thereby it is incided on the sample of analyzing.In one embodiment, measuring head 104 is 45/0 measuring head (for example, make the geometry work of spectrophotometer 100 with 45/0 illumination/observation).In a further embodiment, measuring head 104 is configured to make the light from many LED optical module even, and the two transmits light (that is, thereby in allowing to dodge relatively (intra-flash comparision)) by test channel and reference channel.For example, at U.S. Patent application No.10/916, a kind of exemplary spectrophotometer 45/0 measuring head that can dispose easily according to the present invention has been described in 762, the full content of this U.S. Patent application is contained in this by reference.
Measuring head 104 also is couple to spectroanalysis instrument 106, and is configured to collect the light that is reflected by sample, and this light is offered spectroanalysis instrument 106.Spectroanalysis instrument is configured to carry out collected light is assigned to the high-resolution spectral analysis of a plurality of bands, thus the feature of the reflectance spectrum of performance sample.For the purposes of the present invention, term " high resolving power " refers to that spectroanalysis instrument 106 accurately measures the ability of the luminous energy in the narrow wavelength band.In one embodiment, spectroanalysis instrument 106 comprises 256 sensors that distribute from about 340nm～about 800nm, and has the bandwidth of about 3.5nm, and the bandwidth use external software of described about 3.5nm is transformed to about 10nm.In for the reflection that has less than the sample of about 5% reflectivity, it has obtained to be better than about 0.01% resolution, has also obtained to measure the ability up to " reflection " (for example, fluorescent samples) of about 120%.In one embodiment, spectroanalysis instrument 106 uses the parts of diffraction grating or other functional equivalent that collected light is assigned in a plurality of bands.
Fig. 2 is the synoptic diagram that is used to illustrate an embodiment of LED optical module 102 shown in Figure 1.As mentioned above, LED optical module 102 is used for providing illumination to measuring head 104, and in one embodiment, it comprises luminaire 202, photo-coupler 204 and optical fiber pigtail 206.
Luminaire 202 comprises at least one white light-emitting diode (LED).In one embodiment, luminaire 202 is configured to produce the light of flicker, and the light of this flicker has and standard xenon usually used in the spectrophotometric application essentially identical useful power of glimmering.In one embodiment, luminaire 202 comprises single White LED.In another embodiment, luminaire 202 comprises the group of White LED, wherein can control each independent LED independently.In a further embodiment, luminaire 202 comprises the chip-set array of 9 LED, can be convenient in the very little space light is mixed thereby it is arranged on 9 LED.For compact (for example hand-held) spectrophotometer assembly, the LED group can comprise the set of compact LED mould.In another embodiment, luminaire 202 also comprises at least one of one or more ultraviolet LEDs (for example, being used to evaluate the fluorescence of sample) or one or more infrared LED (for example, being used for producing the wavelength surveyed that is higher than 700nm).
Luminaire 202 is couple to optical fiber pigtail 206 by photo-coupler 204.In one embodiment, photo-coupler 204 is optical-grade plastic coupler.
Referring again to Fig. 1, at the luminaire end, LED optical module 102 is couple to the mechanical fabricated section 108 that is configured to the electric energy from power supply is offered LED optical module 102 as mentioned above.Then, in the bundle 202 of optical fiber pigtail 206 except one (for example, six in this example) all be couple to measuring head 104 with symmetrical manner by their each free ends.These bundles 202 are called " sample illumination diffuser/attenuator fibers ", and will offer measuring head 104 from the light of luminaire 202 with the illumination sample.(for example, the 7th) bundle 202 that is left is couple to spectroanalysis instrument 106.In one embodiment, remaining bundle 202 was blocked by transmission diffusing globe 110 before arriving spectroanalysis instrument 106, thereby the bundle 202 that will be left is divided into first 112 and second portion 114.The first 112 that extends to diffusing globe 110 from the common port 208 of optical fiber pigtail 206 is called " reference optical fiber " and transmits reference illumination (that is the illumination of having reflected with respect to sample); The second portion 114 that extends to spectroanalysis instrument 106 from diffusing globe 110 is called " condition reference optical fiber " and transmission condition (that is, by diffusing globe 110) reference illumination.Last a branch of 116 of optical fiber, it is not the part of optical fiber pigtail 206, extend to spectroanalysis instrument 106 (that is, being used for the reflected light from sample is sent to spectroanalysis instrument 106) from measuring head 104, and be referred to as " sample optical fiber " or " measuring fiber ".
In operation, White LED luminaire 202 is to photo-coupler 204 flickers, and photo-coupler 204 focuses the light on the common port 208 of optical fiber pigtail 206 then, thus the common port 208 of lighting fiber tail optical fiber 206.By sample illumination diffuser fibers 202, illumination is offered measuring head 104, and the illumination sample.Then by sample optical fiber 116 with the light transmission of sample reflection to spectroanalysis instrument 106, will offer spectroanalysis instrument 106 from the illumination of the diffusion of LED optical module 102 by condition reference optical fiber 114 simultaneously.Then, spectroanalysis instrument 106 is measured reflected light (that is, be incorporated in the condition reference optical fiber 114 diffuse illumination) and is showed catoptrical feature.
Use White LED to show some advantages that are better than using traditional pulsed-xenon light sources (for example, xenon arc lamp) in order to produce illumination.For instance, the LED luminaire is than xenon luminaire consumption energy still less.This gives the credit to some factors.The first, LED is directive, and xenon arc lamp does not have (for example, using white box-like housings to reflex in the measuring head from the other light of the lonely lamp of xenon usually); Therefore, less light be wasted (that is, also having improved fiber optic coupling efficiency).The second, in undesirable band, therefore the little energy that White LED comprises than xenon arc lamp can physically dispose closelyr with measuring head, and not damage optical device.The 3rd, LED is littler than xenon arc lamp, does not therefore need so big hole.For example, corresponding to the instrument spacing distance of the about 25mm of distance illumination end, the required typical hole of the lonely lamp of xenon is along the about 25mm of diametric(al)
2As a comparison, for LED, to identical instrument spacing distance along the about 10mm of the smallest cell dimension of diametric reality
2
In addition, comprise the spectrophotometer of White LED luminaire than the easier physically operation of the spectrophotometer that comprises the xenon luminaire.For instance, White LED (estimate usually to be up to 120 degrees centigrade, and even seldom arrive so hot) is colder than xenon luminaire in fact.In addition, use LED to reduce the number of in order to slow down from the emission of the light of xenon luminaire (it is at very short its whole light of time period emission) required unnecessary circuit usually.This circuit often changes spectral power distribution, and efficient is very low, also produces a large amount of undesirable electrical noises.
Led light source is obviously cheap than pulsed-xenon light sources toward contact, and has the longer life-span than pulsed-xenon light sources.The term of life that LED is stable begins behind " lighting " several hrs usually, and the transient phenomenon of spectrum change fast can take place in this several hrs.In addition, white light LEDs often needs less optical filtering to reduce the vestige of undesirable ultraviolet or infrared radiation than xenon arc lamp.
In addition, LED does not often have xenon arc lamp so strong in fact, thereby has caused in the sample triplet still less to absorb.Because the reflectivity that the triplet absorption can make sample is along with nonlinear in light intensity, so the triplet absorption is undesirable.In this case, must extend in time to reduce luminous flux from the pulse of luminaire (for example xenon arc lamp) emission for the range of linearity of reflection sample.
In addition, because LED produces the more output of spatial stability than pulsed-xenon light sources, the energy coupling that therefore enters spectrophotometric optical fiber optical device more can repeat.
In addition, comprise among the embodiment of group of a plurality of LED that can independently control (relative) at luminaire with single White LED, can be by the duration that each independent LED " opens " spectral power distribution of finalizing the design, thus the group of implementing LED is to produce the spectral power distribution of mating very much with required spectrum (thereby eliminated filtering needs).Like this, can be similar to the spectrum (for example comprising real D65) that various common use pulsed xenon illumination can't be similar to.
In the further embodiment of a plurality of LED luminaires configuration, for example as in U.S. Patent No. 6,147,761, U.S. Patent No. 6,020,583 and U.S. Patent No. 5,963, described in 333, the setting by about the optical axis of LED group can realize that the optics of LED light mixes.
In the many LED luminaire embodiment that also comprises ultraviolet LED except White LED, can by only occasionally and only as required amount open ultraviolet LED (the low wavelength of radiation) to 275nm, be reduced in optical device aging of spectrophotometer porch.On the contrary and since ultraviolet light not Be Controlled and must filtering to obtain the state of " not comprising ultraviolet ", therefore use the ultraviolet illumination that the optical device of spectrophotometer porch is worn out more quickly in conjunction with traditional xenon light source.This undesirable ultraviolet light makes the optical device of spectrophotometer porch aging, and makes its flavescence.
In addition, by test channel (for example, sample optical fiber 116) and reference channel (for example, reference optical fiber 112/ condition reference optical fiber 114) the two provides uniform illumination to spectroanalysis instrument 106, allowed in the sudden strain of a muscle of the illumination that illumination that LED provided and sample reflected relatively (promptly, in the illumination of sample reflection, the illumination that LED produced is measurable).This comparison " elimination " spectrum of LED (when the intensity of LED changed by Current Control, the spectrum of LED had carried out complicated variation), make it possible to realize to the more accurate feature performance of sample reflectance spectrum.Illumination for LED produces comprises that traditional spectroanalysis instrument of a plurality of individual passage does not comprise reference channel usually, therefore can not provide this advantage.
Those skilled in the art will recognize that spectrophotometer 100 can be without departing from the present invention, assemble with the configuration that substitutes that does not need one or more assemblies shown in Figure 1.For example, can assemble the compact or the hand-held spectrophotometer that comprise White LED light source and spectroanalysis instrument, and not need the photo-coupler in the LED optical module.
Fig. 3 is the synoptic diagram that is used to illustrate according to another embodiment of spectrophotometer 300 of the present invention.Concrete, spectrophotometer 300 is integrating sphere spectrophotometers.In essence, the integrating sphere spectrophotometer has substituted among Fig. 1 from optical fiber pigtail 206 assembly (comprising measuring head 104) before.At U.S. Patent application No.11/050, an exemplary integrating sphere spectrophotometer that can dispose easily according to the present invention has been described in 408, the full content of this patented claim is contained in this by reference.
Spectrophotometer 300 generally includes globe of diffusion 302, spectroanalysis instrument 304, luminaire 306 and specimen port 308.
Luminaire 306 directly is couple to globe of diffusion 302, and comprises near the baffle plate 310 one or more White LED (for example single White LED or the array of LED) and the one or more LED of being positioned at
1～310
n(below be referred to as " baffle plate 310 ") is to reduce from luminaire 306 to sample or the generation of the direct light path of detecting device.In one embodiment, as at U.S. Patent application No.11/016, described in 033, luminaire 306 (for example also comprises second stabilized light source, as by digital camera, make it possible to evaluate in-situ sample), the full content of this patented claim is contained in this by reference.In this embodiment, implement LED with provide lower powered continuously and the strong illumination of pulse.
Outside above-mentioned advantage (for example, reducing power consumption, colder light source etc.), when associative multiplication bulb separation spectrophotometer structural arrangements, the use of White LED light source is converted into further benefit.For example, the reduction of power consumption is more remarkable, because the size in the required less hole of White LED makes that also the baffle plate among the integrating sphere embodiment is less, thereby makes the more thorough and more isotropically diffusion of globe of diffusion, and has improved the measuring accuracy to anisotropic specimens.
As an example, consider to comprise the integrating sphere spectrophotometer of xenon luminaire, this xenon luminaire applies 15 joules, 1 millisecond pulse, thereby causes about 15000 watts peak power.On the contrary, identical spectrophotometer comprises White LED luminaire (that is, comprising single white LED or White LED array), and this White LED luminaire applies 0.4 joule, 70 milliseconds pulse, and experimental result shows that the peak power that is produced approaches about 6 watts.
Fig. 4 is the synoptic diagram of an embodiment (for example, as the luminaire 202 of Fig. 2 or the luminaire 306 of Fig. 3) of the luminaire 400 that can dispose easily according to the present invention.Particularly, luminaire 400 is chip-set array of LED.
Especially, luminaire 400 comprises 9 LED 402
1-402
9(below be referred to as " LED402 "): the first promptly maximum LED 402
1Be positioned at the center of chipset in fact, 4 less LED402
2-402
9Be positioned at a LED402
1Relative side.
Therefore, the present invention is in spectrophotometry field performance obvious improvement.As mentioned above, use led light source rather than the xenon light source sample that throws light on, showing advantage aspect cost, reliability and the physics practicality.In addition, spectrophotometer can be with the photolysis of sample reflection to a plurality of bands, wherein the quantity of the band restricted number of LED of sample that is not used to throw light on.
Although illustrated herein and the clear in detail various embodiment that comprise teaching contents of the present invention, those skilled in the art can easily design a lot of other and still comprise the embodiment of the change of these teaching contents.
The cross reference of related application
The application requires the U.S. Provisional Patent Application No.60/661 of submission on March 14th, 2005, the rights and interests of 376 (denomination of invention is " the sample luminaire comprises the spectrophotometer with spectroanalysis instrument of one or more light emitting diodes "), its full content is contained in this by reference.
Claims (20)
1. the spectrophotometer of the feature of a reflectance spectrum that is used to show sample, described spectrophotometer comprises:
Be used to the to throw light on optical module of described sample, described optical module comprises at least one light emitting diode;
Measuring head, it is couple on the described optical module, to collect the light of described sample reflection;
Spectroanalysis instrument, it is couple on the described measuring head, to carry out described collected light is assigned to the spectral analysis of a plurality of bands;
Reference channel is used for the illumination from described optical module is offered described spectroanalysis instrument, and
Test channel is used for the described collected light from described measuring head is offered described spectroanalysis instrument.
2. spectrophotometer as claimed in claim 1 is characterized in that, described at least one light emitting diode is a white light-emitting diode.
3. spectrophotometer as claimed in claim 2 is characterized in that, described at least one light emitting diode also comprises at least one in ultraviolet light-emitting diode or the infrarede emitting diode.
4. spectrophotometer as claimed in claim 1 is characterized in that, described optical module also comprises:
Be couple to the optical fiber pigtail of described at least one light emitting diode, described optical fiber pigtail comprises a plurality of bundles of optical fiber, described a plurality of intrafascicular common ports of each Shu Gongyong, and have a free end that is independent of described a plurality of intrafascicular all the other bundles.
5. spectrophotometer as claimed in claim 4 is characterized in that, described a plurality of bundles comprise 7 bundles.
6. spectrophotometer as claimed in claim 4 is characterized in that, described common port is couple to described at least one light emitting diode with described optical fiber pigtail.
7. spectrophotometer as claimed in claim 4, it is characterized in that, at each described free end, describedly a plurality ofly intrafascicularly except a bundle, all be couple to described measuring head, and described reference channel comprises a described a plurality of intrafascicular remaining bundle, and this bundle is couple to described spectroanalysis instrument at described free end.
8. spectrophotometer as claimed in claim 7 is characterized in that, describedly a plurality ofly intrafascicularly all is configured to jointly provide light with the described sample that throws light on except a bundle.
9. spectrophotometer as claimed in claim 7 is characterized in that, also comprises:
Be couple to the transmission diffusing globe of described reference channel, make described reference channel comprise:
Extend to the first of described transmission diffusing globe from described common port; And
Extend to the second portion of described spectroanalysis instrument from described transmission diffusing globe.
10. spectrophotometer as claimed in claim 9 is characterized in that described first is configured to transmit reference illumination.
11. spectrophotometer as claimed in claim 9 is characterized in that, described second portion is configured to transmit the condition reference illumination.
12. spectrophotometer as claimed in claim 1 is characterized in that, described measuring head is a globe of diffusion.
13. spectrophotometer as claimed in claim 12 is characterized in that, described optical module also comprises:
The location stops at least one baffle plate of the direct light path from described at least one light emitting diode to described sample.
14. spectrophotometer as claimed in claim 1 is characterized in that, described at least one light emitting diode comprises a plurality of light emitting diodes that can independently control.
15. spectrophotometer as claimed in claim 14 is characterized in that, the described a plurality of led configurations that can independently control are for to finalize the design to spectral power distribution.
16. spectrophotometer as claimed in claim 14 is characterized in that, at least one in the described a plurality of light emitting diodes that can independently control is configured to produce continuous illumination.
17. spectrophotometer as claimed in claim 14 is characterized in that, at least one in the described a plurality of light emitting diodes that can independently control is configured to typing and produces pulsing light.
18. spectrophotometer as claimed in claim 1 is characterized in that, described at least one light emitting diode comprises the chip-set array of 9 light emitting diodes.
19. spectrophotometer as claimed in claim 1 is characterized in that, described spectroanalysis instrument comprises diffraction grating.
20. the spectrophotometer of the feature of a reflectance spectrum that is used to show sample, described spectrophotometer comprises:
Be used to the to throw light on parts of described sample, described illuminace component comprises at least one light emitting diode;
Be used to collect the parts of the light of described sample reflection;
Be used to carry out described collected light is assigned to the parts of the spectral analysis of a plurality of bands;
Be used for offering the parts of described spectroanalysis instrument from the illumination of described optical module, and
Be used for to offer the parts of described spectroanalysis instrument from the described collected light of described measuring head.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US66137605P | 2005-03-14 | 2005-03-14 | |
| US60/661,376 | 2005-03-14 | ||
| US11/371,839 | 2006-03-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101248335A true CN101248335A (en) | 2008-08-20 |
Family
ID=39947923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800083953A Pending CN101248335A (en) | 2005-03-14 | 2006-03-13 | Spectrophotometer with light emitting diode illuminator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101248335A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778439A (en) * | 2012-06-28 | 2012-11-14 | 中国科学院合肥物质科学研究院 | Multiple-light-emitting-diode (LED) combined wideband light source device applied to difference absorption spectrum system |
| CN104523241A (en) * | 2015-01-21 | 2015-04-22 | 浙江大学 | Detecting device and detecting method for optical characteristics of biological tissue |
| CN105308450A (en) * | 2013-02-20 | 2016-02-03 | 克罗马利蒂卡有限责任公司 | Uv light emitting diode as light source in gas chromatography-uv absorption spectrophotometry |
-
2006
- 2006-03-13 CN CNA2006800083953A patent/CN101248335A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778439A (en) * | 2012-06-28 | 2012-11-14 | 中国科学院合肥物质科学研究院 | Multiple-light-emitting-diode (LED) combined wideband light source device applied to difference absorption spectrum system |
| CN102778439B (en) * | 2012-06-28 | 2014-08-27 | 中国科学院合肥物质科学研究院 | Multiple-light-emitting-diode (LED) combined wideband light source device applied to difference absorption spectrum system |
| CN105308450A (en) * | 2013-02-20 | 2016-02-03 | 克罗马利蒂卡有限责任公司 | Uv light emitting diode as light source in gas chromatography-uv absorption spectrophotometry |
| CN104523241A (en) * | 2015-01-21 | 2015-04-22 | 浙江大学 | Detecting device and detecting method for optical characteristics of biological tissue |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7456955B2 (en) | Spectrophotometer with light emitting diode illuminator | |
| CN1815196B (en) | Multi-channel fluorescence sample analyzer | |
| AU2021200020B2 (en) | Devices for real-time polymerase chain reaction | |
| CN102494776B (en) | Spectrophotometer and method | |
| CN104380065B (en) | For launching the discharger of the light beam of controlled spectrum | |
| JP2014232120A (en) | Spectrum measurement device for fluid analysis | |
| CN102042961B (en) | Fiber reflecting type micro-nano system spectrophotometer and application thereof | |
| CN201016843Y (en) | LED light flux testing device employing narrow beam standard light source | |
| CN105223137A (en) | A kind of optical measuring device for detection of biological samples | |
| CN101248335A (en) | Spectrophotometer with light emitting diode illuminator | |
| CN201053901Y (en) | Quick spectrophotometer for color measuring | |
| CN205038151U (en) | A optical measurements device for biological sample test | |
| CN2771851Y (en) | Optical fiber coupling device for fluorospectro photometer | |
| TWI709732B (en) | Spectrum measurement system | |
| CN210953817U (en) | Portable gem fluorescence analyzer | |
| US20080100839A1 (en) | Method and system for measuring light propagating at multiple wavelengths | |
| CN213148741U (en) | Handheld Raman spectrometer for rapid quantitative detection of oil | |
| CN1063760A (en) | Optical fibre transmission photo-electronic directly reading spectrograph | |
| CN112067124B (en) | Programmable fiber grating spectrometer based on magnetofluid | |
| Ferrell et al. | Instrumentation systems for passive fiber optic chemical sensors | |
| Ferrell et al. | Instrumentation systems for passive fiber optic chemical sensors | |
| RU137615U1 (en) | PHOTOMETER |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080820 |