CN108051413A - A kind of light activated photoluminescence spectra measuring system of pulse - Google Patents
A kind of light activated photoluminescence spectra measuring system of pulse Download PDFInfo
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- CN108051413A CN108051413A CN201711239788.1A CN201711239788A CN108051413A CN 108051413 A CN108051413 A CN 108051413A CN 201711239788 A CN201711239788 A CN 201711239788A CN 108051413 A CN108051413 A CN 108051413A
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- 238000000103 photoluminescence spectrum Methods 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 37
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 238000001228 spectrum Methods 0.000 claims abstract description 12
- 238000013480 data collection Methods 0.000 claims abstract description 10
- 230000003287 optical effect Effects 0.000 claims description 14
- 239000013307 optical fiber Substances 0.000 claims description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 9
- 230000005284 excitation Effects 0.000 claims description 7
- 239000004065 semiconductor Substances 0.000 claims description 5
- 230000005622 photoelectricity Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000004020 luminiscence type Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6402—Atomic fluorescence; Laser induced fluorescence
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/061—Sources
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Optics & Photonics (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The present invention provides a kind of light activated photoluminescence spectra measuring system of pulse, including：Light-pulse generator, light focusing unit, specimen holder, faint light collection portion, grating beam splitting portion, photoelectric receiving arrangement, voltage pulse peak detection block and data collection and control module.The light pulse being emitted from the light-pulse generator is focused on the specimen holder by the light focusing unit on the analyzed material placed；The fluorescence being emitted from analyzed material is converged at by the faint light collection portion at the entrance slit in the grating beam splitting portion, fluorescence after light splitting is received by the photoelectric receiving arrangement and is converted into pulse voltage signal, is sampled and is kept using the voltage pulse peak detection block.Data collection and control module is for controlling the grating beam splitting portion, data acquisition, data store and spectrum is shown.A kind of high sensitivity of the light activated photoluminescence spectra measuring system of pulse of the present invention, measurement wave-length coverage is wide and wavelength resolution is adjustable.
Description
Technical field
The present invention relates to spectral measurement methods field, especially a kind of light activated photoluminescence spectra measuring system of pulse.
Background technology
Luminescent material (containing organic and phosphor) inside can be analyzed using photoluminescence spectra measurement technology
Electronic energy level structure.Exciting light using photon energy higher (or wavelength is shorter) can cause material internal electronics from low-lying level
Transition between states is to high level state, and when low-lying level state is returned in the electron transition in high level state, extra energy is possible to
Photon is converted to, which is referred to as luminescence generated by light.In addition, if the wavelength of the light of sample outgoing is shorter than the wavelength of exciting light,
Sample the phenomenon that luminous that is excited, is referred to as converting photoluminescent.Herein, two kinds of situations are referred to as luminescence generated by light by we
The luminescence generated by light being emitted from sample is called fluorescence by phenomenon.
Luminous intensity in photoluminescence spectra reflects the electricity of material internal with the distribution situation of photon energy (or wavelength)
Sub- level structure.It, can be on the premise of luminescent material is not damaged using the light-pulse generator light source activation luminescent material of high-energy
Stronger luminescence generated by light signal is obtained, can obtain can not obtain photoluminescence spectra under stable light source excitation, be conducive to depth
Enter the electronic energy level structure inside analysis of material.
Employed in the existing light activated luminescence generated by light system of pulse optical multichannel analyzer as light-dividing device and
Photoelectric conversion module.Optical multichannel analyzer actually one is divided and using grating using CCD (charge-coupled devices
Part) carry out opto-electronic conversion analytical equipment, although there is the advantages of acquisition speed is fast, have the disadvantage that：
1) since the response wave length scope of CCD is limited, the wavelength measurement scope of entire luminescence generated by light system is limited be subject to CCD
System；
2) the common photomultiplier of the remolding sensitivity of CCD device and the semiconductor photo detector of separate unit are low,
This means the ability of systematic survey extremely faint optical signal is very limited；
3) wavelength resolution of spectrum is depending on the pixel resolution of CCD and the size of entrance slit, it is difficult to obtain Gao Bo
The spectrum of long resolution ratio；
4) the Advanced Diffraction spectrum of grating is usually included in the spectrum measured by, the parsing of this spectrum causes tired
It is difficult.In addition, it can not directly be obtained under pulsed light excitation using the light activated photoluminescence spectra measuring system of common stable state
Photoluminescence spectra.
The content of the invention
To solve the above-mentioned problems, the present invention provides a kind of light activated photoluminescence spectra measuring system of pulse, this is
System has the advantages that high sensitivity, wave-length coverage are wide and wavelength resolution is adjustable.
To achieve these goals, the technical scheme is that：
A kind of light activated photoluminescence spectra measuring system of pulse, including：It is light-pulse generator, light focusing unit, specimen holder, micro-
Dim light collection portion, grating beam splitting portion, photoelectric receiving arrangement, voltage pulse peak detection block and data acquisition and control module；
The light-pulse generator is used to generate pulsed light to excite the fluorescence in analyzed material；
The light focusing unit is used to focusing on pulsed light into the surface for being placed on the analyzed material on specimen holder；
The specimen holder is used to place analyzed material；
The faint light collection portion is used to collect the fluorescence of analyzed material, and fluorescence is converged to the grating beam splitting portion
Entrance slit at；
The grating beam splitting portion is used to the fluorescence that the faint light collection portion is collected being divided；
The photoelectric receiving arrangement is believed for receiving the fluorescence after the light of the grating beam splitting part and being converted into photoelectric current
Number, the photoelectric receiving arrangement is internally provided with current amplifier, and the current amplifier is used to convert photoelectricity signal pulse stream
For voltage pulse signal；
The voltage pulse peak detection block is used for the voltage pulse signal for exporting the photoelectric receiving arrangement and carries out
Sampling and holding are simultaneously exported with the crest voltage of voltage pulse signal to data collection and control module；
The data collection and control module is for controlling the grating in the grating beam splitting portion to rotate, data store and spectrum
Display.
Further, the light-pulse generator is pulse laser or the flash lamp with monochromatization system.
Further, the light focusing unit is optical fiber or condenser lens.
Further, the grating beam splitting portion is C-T types monochromator or Li Teluo type monochromators.
Further, the light beam incidence end of the analyzed material on the specimen holder and week fluorescent collecting terminal are all provided with
There is optical fiber, the optical fiber is used to guide the light of the light-pulse generator to the surface of the analyzed material or from analyzed material
The surface of material guides fluorescence to the grating beam splitting portion.
Further, the faint light collection portion includes phosphor collection lens and optical filter, the optical filter
For filtering off scattering light of the analyzed material to pulse excitation light, optical fiber replacement may be employed in the phosphor collection lens.
Further, the photoelectric receiving arrangement further includes photoelectric detection module and voltage amplifier, the photodetection
For module for photomultiplier or semiconductor detector and with current amplifier, the voltage amplifier exports current amplifier
Voltage pulse signal be further amplified.
The invention has the advantages that photoelectric detection module can be photomultiplier or semiconductor photo detector, lead to
The spectro-grating using the detector with different wave length response range and different blaze wavelengths is crossed, it can be in different wavelength
In the range of to sample carry out photoluminescence spectra measurement.Due to employing the grating beam splitting portion of scan-type in system, the system
Wavelength resolution can be adjusted by setting the width of entrance slit and exit slit on request；If using single pulse energy
High light-pulse generator device can obtain stronger fluorescence light pulse, the sensitivity of whole system can be shown as excitation light source
It writes and improves.
Description of the drawings
Fig. 1 is the functional block diagram of the light activated photoluminescence spectra measuring system of pulse of the present invention.
Fig. 2 is the structure diagram of the light activated photoluminescence spectra measuring system of pulse of the present invention.
In figure, 1- light-pulse generators, 2- light focusing units, 3- specimen holders, 4- low-light collection portions, 41- phosphor collection lens, 42-
Optical filter, 5- grating beam splittings portion, 51- entrance slits, 52- incidence spherical reflectors, 53- gratings, 54- outgoing spheric reflections
Mirror, 55- exit slits, 6- photoelectric receiving arrangements, 61- photoelectric detection modules, 62- voltage amplifiers, the inspection of 7- voltage pulses peak value
Survey module, 8- data collection and control modules.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment belongs to the scope of protection of the invention.
It should be noted that when component is referred to as " being fixed on " another component, it can be directly on another component
Or there may also be components placed in the middle.When a component is considered as " connection " another component, it can be directly connected to
To another component or it may be simultaneously present component placed in the middle.When a component is considered as " being arranged at " another component, it
Can be set directly on another component or may be simultaneously present component placed in the middle.Term as used herein is " vertical
", " horizontal ", "left", "right" and similar statement for illustrative purposes only.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The normally understood meaning of technical staff is identical.Term used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein " and/or " include one or more phases
The arbitrary and all combination of the Listed Items of pass.
Please referring also to Fig. 1 and Fig. 2, a kind of light activated photoluminescence spectra measuring system of pulse include light-pulse generator 1,
Light focusing unit 2, specimen holder 3, faint light collection portion 4, grating beam splitting portion 5, photoelectric receiving arrangement 6, voltage pulse peak detection mould
Block 7 and data collection and control module 8.
Light-pulse generator 1 excites fluorescence for generating pulsed light in analyzed material, in the present embodiment light-pulse generator 1
The nanosecond laser for being 355nm for a launch wavelength.
Light focusing unit 2 is condenser lens.Be irradiated to from the light beam that nanosecond laser is sent after light focusing unit focuses on by
On analysis of material surface.
Specimen holder 3 is analyzed the organic light emission material that material is more than 355 nanometers for emission wavelength for placing analyzed material
Material or phosphor.
The fluorescence that faint light collection portion 4 is emitted for collection from analyzed material surface.Faint light collection portion 4 includes glimmering
Light collecting lens 41 and optical filter 42, phosphor collection lens 41 are used for 5 incidence of fluorescent foci to grating beam splitting portion
On slit；Optical filter 42 is used to filter off the scattering light of analyzed material on incident pulsed light, is under normal conditions a long wave
Logical optical filter.But when measuring upper converting photoluminescent spectrum, long wave should be led to optical filter 42 and be changed to short-pass
Optical filter 42.
For the fluorescence that faint light collection portion 4 is collected to be divided, grating beam splitting portion 5 is C-T type lists in grating beam splitting portion 5
Color device or Li Teluo type monochromators.
Using C-T type monochromators in the present embodiment, including entrance slit 51, incident spherical reflector 52, grating 53, outgoing
Spherical reflector 54 and exit slit 55, the week fluorescent that faint light collection portion 4 is collected pass sequentially through entrance slit 51, incident ball
Face speculum 52, grating 53, outgoing spherical reflector 54 and exit slit 55, grating beam splitting portion 5 are scan-type light-dividing device, light
The wavelength resolution of grid spectrum part 5 can be adjusted by setting the width of entrance slit 51 and exit slit 55, grating beam splitting
The wave-length coverage in portion 5 depends on the blaze wavelength and corner of spectro-grating.
Photoelectric receiving arrangement 6, for receiving the fluorescence after grating beam splitting portion 5 is divided and being converted into current signal, institute
It states the current amplifier inside photoelectric receiving arrangement 6 and is converted to voltage pulse signal.Photoelectric receiving arrangement 6 includes photodetection mould
Block 61 and voltage amplifier 62, photoelectric detection module can be photomultiplier or semiconductor detector, 62 energy of voltage amplifier
It is enough further to be amplified the weak voltage pulse signal that photoelectric detection module 61 exports.
Voltage pulse peak detection block 7 be used to be sampled the voltage pulse signal that photoelectric receiving arrangement 6 exports and
It keeps and is exported with the crest voltage of voltage pulse signal to data collection and control module 8.The voltage and fluorescence intensity of output
It is directly proportional.
Data collection and control module 8 has control grating rotating function, data storage function and spectrum display function.
Measurement process is as follows, and the nanosecond pulse light beam emitted from nanosecond laser is focused on by light focusing unit 2, is focused on
Light beam afterwards, which is irradiated on the luminescent material of specimen holder 3, inspires week fluorescent, and week fluorescent is converged by phosphor collection lens 41
It is poly-, then by filtering off luminescent material after optical filter 42 to the scattering light of pulse excitation light after.Again by entrance slit 51 after
Directive spherical reflector 52, incident spherical reflector 52 is by light beam parallelization.Collimated light beam directive grating 53, is divided through grating 53
Light beam directive outgoing spherical reflector 54 afterwards.The reflected light of outgoing spherical reflector 54 converges at exit slit 55.Emergent light
It is received by the photoelectric detection module 61 after exit slit 55 and is converted into faint photo-signal, faint photo-signal is through photoelectricity
Current amplifier inside detecting module 61 is converted to weak voltage pulse signal, using formation one after voltage amplifier 62 just
Voltage pulse signal.The peak value of positive voltage pulse signals is proportional to the fluorescence intensity by monochromatization.Utilize voltage pulse peak value
After detection module 7 is sampled and kept to positive voltage pulse signals, the number with AD conversion and data acquisition function is input to
According to acquisition and control module 8, finally data are handled, and depict change curve of the fluorescence intensity with light splitting wavelength, i.e.,
Fluorescent spectrum curve.
In systems, optical fiber substitution light focusing unit 2 may be employed, the emergent light of light-pulse generator 1 is imported into analyzed
Material surface carries out fluorescence excitation, and optical fiber substitution phosphor collection lens 41 can also be used to collect to go out from analyzed material surface
The fluorescence signal penetrated simultaneously is directed at the entrance slit 51 in grating beam splitting portion 5.
Claims (7)
1. a kind of light activated photoluminescence spectra measuring system of pulse, which is characterized in that including：Light-pulse generator (1), optically focused list
First (2), specimen holder (3), faint light collection portion (4), grating beam splitting portion (5), photoelectric receiving arrangement (6), the inspection of voltage pulse peak value
Survey module (7) and data acquisition and control module (8)；
The light-pulse generator (1) is used to generate pulsed light to excite the fluorescence in analyzed material；
The light focusing unit (2) is used to focusing on pulsed light into the surface for being placed on the analyzed material on specimen holder；
The specimen holder (3) is used to place analyzed material；
The faint light collection portion (4) is used to collect the fluorescence of analyzed material, and fluorescence is converged to the grating beam splitting portion
(5) at entrance slit；
The grating beam splitting portion (5) is used to the fluorescence that the faint light collection portion (4) is collected being divided；
The photoelectric receiving arrangement (6) is used for the fluorescence received after the grating beam splitting portion (4) is divided and is converted into photoelectric current
Signal, the photoelectric receiving arrangement (6) are internally provided with current amplifier, and the current amplifier is used for photoelectricity signal pulse stream
Be converted to voltage pulse signal；
The voltage pulse peak detection block (7) be used for by the photoelectric receiving arrangement (6) output voltage pulse signal into
Row sampling and holding are simultaneously exported with the crest voltage of voltage pulse signal to data collection and control module；
The data collection and control module (8) is for controlling the grating of the grating beam splitting portion (5) to rotate, data store and light
Spectrum display.
2. a kind of light activated photoluminescence spectra measuring system of pulse according to claim 1, it is characterised in that：It is described
Light-pulse generator (1) is pulse laser or the flash lamp with monochromatization system.
3. a kind of light activated photoluminescence spectra measuring system of pulse according to claim 1, it is characterised in that：It is described
Light focusing unit (2) is condenser lens or optical fiber.
4. a kind of light activated photoluminescence spectra measuring system of pulse according to claim 1, it is characterised in that：It is described
Grating beam splitting portion (5) is C-T types monochromator or Li Teluo type monochromators.
5. a kind of light activated photoluminescence spectra measuring system of pulse according to claim 1, it is characterised in that：It is described
The light beam incidence end and week fluorescent collecting terminal of the analyzed material on specimen holder (3) are equipped with optical fiber, and the optical fiber is used
In guiding the light of the light-pulse generator (1) to the surface of the analyzed material or from the surface of analyzed material by fluorescence
It guides to the grating beam splitting portion (5).
6. a kind of light activated photoluminescence spectra measuring system of pulse according to claim 1, it is characterised in that：It is described
Faint light collection portion (4) includes phosphor collection lens (41) and optical filter (42), and the optical filter (42) is used to filter
Scattering light of the analyzed material to pulse excitation light is removed, optical fiber replacement may be employed in the phosphor collection lens (41).
7. a kind of light activated photoluminescence spectra measuring system of pulse according to claim 1, it is characterised in that：It is described
Photoelectric receiving arrangement (6) further includes photoelectric detection module (61) and voltage amplifier (62), and the photoelectric detection module (61) is
Photomultiplier or semiconductor detector simultaneously carry current amplifier, what the voltage amplifier (62) exported current amplifier
Voltage pulse signal is further amplified.
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| CN201711239788.1A CN108051413A (en) | 2017-11-30 | 2017-11-30 | A kind of light activated photoluminescence spectra measuring system of pulse |
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| CN201711239788.1A CN108051413A (en) | 2017-11-30 | 2017-11-30 | A kind of light activated photoluminescence spectra measuring system of pulse |
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Cited By (4)
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| CN112268885A (en) * | 2020-10-22 | 2021-01-26 | 清华大学 | Semiconductor nanowire photoluminescence characteristic in-situ characterization system for scanning electron microscope |
| CN112345502A (en) * | 2020-10-27 | 2021-02-09 | 天津市英贝特航天科技有限公司 | Detector for eliminating fluorescence noise in fluorescence immunoassay analyzer |
| CN112782131A (en) * | 2019-11-11 | 2021-05-11 | 成都辰显光电有限公司 | Spectrum detection system and spectrum detection method |
| CN113720824A (en) * | 2021-11-01 | 2021-11-30 | 北京理工大学 | Fluorescence detection system and fluorescence spectrum splicing method |
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Application publication date: 20180518 |