CN101666679A - Quasi-continuous light splitting system based on narrow-band LED light source group - Google Patents
Quasi-continuous light splitting system based on narrow-band LED light source group Download PDFInfo
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- CN101666679A CN101666679A CN200910152609A CN200910152609A CN101666679A CN 101666679 A CN101666679 A CN 101666679A CN 200910152609 A CN200910152609 A CN 200910152609A CN 200910152609 A CN200910152609 A CN 200910152609A CN 101666679 A CN101666679 A CN 101666679A
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Abstract
The invention discloses a quasi-continuous light splitting system based on a narrow-band LED light source group, comprising a narrow-band LED light source group, an LED light source driving circuit, an LED mounting plate, a stepper motor and a control system, wherein, the narrow-band LED light source group is composed of a plurality of narrow-band LED light sources which are mounted on the LED mounting plate according to an increasing order or a decreasing order of central wave length and are connected with the LED light source driving circuit; the stepper motor drives the LED mounting plate to move; and the control system turns on the LED light source driving circuit which moves in place and controls the rotating speed and the stop time of the stepper motor. The quasi-continuous light splitting system of the invention has no single light splitting component, has simple and compact light path structure, stable and reliable light source, low electricity consumption and fast scanning speed, is especially suitable for the light source and the light splitting system of a portable spectrometer, and can be widely used in visible ultraviolet spectrophotometers and near-infrared spectrophotometers.
Description
Technical field
The present invention relates to a kind of quasi-continuous beam splitting system, especially a kind of quasi-continuous beam splitting system based on the narrow-band LED light sources.
Background technology
In ultraviolet-visible light-near infrared sub-ray spectrometer, the mainly employing continuous composite light source in broadband (deuterium lamp and halogen tungsten lamp), and employing prism scanning beam split-photomultiplier detection, raster scanning beam split-photomultiplier detection, grating beam splitting-photodiode array (PDA) or beam splitting systems such as line array CCD detection and Fourier transform obtain continuous monochromatic light.These methods have relative merits separately.Deuterium lamp and halogen tungsten lamp be as wideband light source, and it is stronger to have an optical radiation, the wide (advantage such as 190nm～2500nm), but also have shortcomings such as thermal value is big, light intensity is unstable, the life-span is short of wavelength coverage.Beam split-photomultiplier detection beam splitting system is simple in structure in prism scanning, but the beam split precision is relatively poor.Raster scanning beam split-photomultiplier detects beam splitting system and has higher beam split precision, but the optical grating construction complexity, secondary diffraction serious interference, monolithic grating wavelength are limited in scope.Fourier transform beam splitting system structure and complex process require height, less stable, cost height to working environment.More than three kinds of beam splitting systems moving-member is all arranged, the light channel structure complexity, stability of instrument is relatively poor, is not suitable for making portable spectrometer.Do not have moving-member in grating beam splitting-PDA detection or the line array CCD detection system, can make portable spectrometer, but PDA detecting device and line array CCD detecting device price are higher, the grating splitting system more complicated.
Summary of the invention
The invention provides a kind of do not have light-splitting device, the quasi-continuous beam splitting system of volume LED little, in light weight, good stability.
A kind of quasi-continuous beam splitting system based on the narrow-band LED light sources, it is characterized in that: comprise narrow-band LED light sources, led light source driving circuit, LED installing plate, stepper motor, control system, the narrow-band LED light sources is made up of several narrow-band LED light sources, the narrow-band LED light source is installed on the LED installing plate and with the led light source driving circuit by the order of centre wavelength increasing or decreasing and links to each other, step motor drive LED installing plate moves, and control system makes the led light source driving circuit conducting that moves into place; The rotating speed and the stand-by time of stepper motor are controlled by control system.
The LED installing plate can be discoidal, is provided with several mounting holes along circumference and is used to install the narrow-band LED light source.The rotation of disc installing plate is moved more convenient rapid.
The LED installing plate can also be square, is provided with some mounting holes and is used to install the narrow-band LED light source by the arrangement of array formula.The array formula is arranged can install more led light source.
The led light source kind is many, wavelength coverage is wide, the wavelength interval is little, narrow bandwidth, response fast especially (10
-6～10
-7S, μ s level).Narrow-band LED light source light spectrum bandwidth is less than 20nm, the wavelength accuracy height; The angle of divergence is little.
The centre wavelength scope of led light source group is 200nm～2500nm, has comprised ultraviolet-visible light and near infrared light.
Preferably, the led light source group is made up of 5-500 narrow-band LED light source, can satisfy precision height, quasi-continuous, requirement that wavelength coverage is wide so simultaneously.
The narrow-band LED light source of led light source group can by centre wavelength arbitrary interval increasing or decreasing order be installed on the LED installing plate, at interval be preferably 5～50nm, can realize the quasi-continuous of wavelength.
The led light source driving circuit adopts constant-current source circuit, controls its switch by control system, and the light monochromaticity of generation is good, stabilized intensity, unanimity, and system stability is good.
After led light source is luminous, collimate, obtain parallel light beam through collimation lens set, and by exit slit control emergent light intensity.
Because no independent light splitting part in the system, light channel structure are simply compact, light stability is reliable, power consumption is extremely low, sweep velocity is fast, is particularly suitable for light source and beam splitting system as portable spectrometer, can be widely used in ultraviolet-visible photothermal spectroscopic analyzer and the near infrared spectrometer.
Description of drawings
Fig. 1 is the structural representation of first kind of embodiment of the present invention.
Fig. 2 is the structural representation of LED installing plate shown in Figure 1.
Fig. 3 is the structural representation of second kind of embodiment of the present invention.
Fig. 4 is the structural representation of LED installing plate shown in Figure 3.
Fig. 5 is LED constant-current source circuit figure.
Fig. 6 is first kind of monochromatic light spectrogram that embodiment obtained of the present invention.
Fig. 7 is second kind of monochromatic light spectrogram that embodiment obtained of the present invention.
Embodiment
The structural representation of one embodiment of the present invention as shown in Figure 1, the quasi-continuous beam splitting system of LED comprises the narrow-band LED light sources of being made up of 50 narrow-band LED light sources 1, and led light source constant-current drive circuit 4, disc LED install wheel 2, stepper motor 3, exit slit 5, collimation lens set 7 and control system 6.The equidistant round LED that is installed in of the incremental order of narrow-band LED light sources centre wavelength size interval 20nm is installed on the wheel 2, the spectral bandwidth of led light source is 15nm, the angle of divergence is 10 °, the centre wavelength scope of led light source group is 800nm～1780nm, stepper motor 3 driving LED are installed wheel 2 rotations, led light source 1 adopts constant current source 4 to drive, and constant current source 4 drives by control system 6 controls, and links to each other with each led light source 1.When certain led light source 1 turned to the center of exit slit 5, stepper motor 3 stopped operating, and control system 6 makes this LED constant current source 4 driving circuit conductings, and led light source 1 is lighted, and produced monochromatic light.The rotating speed of stepper motor 3 and dead time are by control system 6 controls.After led light source 1 was lighted, the monochromatic light of generation also formed directional light by collimation lens set 7 collimation backs.Control system adopts the ARM7 embedded system.The structural representation that disc LED installs wheel 2 as shown in Figure 2, the equidistant mounting hole on the periphery is used to install led light source 1, interior shaft position is installed stepper motor 3.
The structural representation of another embodiment of the invention as shown in Figure 3, the quasi-continuous beam splitting system of LED comprises the led light source group of being made up of 100 narrow-band LED light sources 1, LED array installing plate 2, led light source constant current source 4, numerical control stepper motor 3, control system 6, collimation lens set 7, exit slit 5.The narrow-band LED light sources is by the order of successively decreasing of centre wavelength size interval 10nm, and 10 row, 10 row are installed on the LED array installing plate 2, link to each other with constant current source 4 by P.e.c., realize the control of constant-current driving and switch.The spectral bandwidth of led light source 1 is 8nm, and the angle of divergence is 8 °, adopts 20mA constant current source 4 to drive, and the centre wavelength scope of led light source group is 1390nm～400nm.Numerical control stepper motor 3 driving LED array installing plates 2 move, and when certain led light source 1 turned to the center of exit slit 5, control system 6 made this LED constant current source 4 driving circuit conductings, and led light source 1 is lighted, and produce monochromatic light.Control system 6 control numerical control stepper motors are accurately controlled moving of LED array installing plate 2 and location.After led light source 1 was lighted, the monochromatic light of generation also formed directional light by collimation lens set 7 collimation backs, regulates the outgoing light intensity by exit slit 5.Control system adopts the ARM7 embedded system.
The structural representation of array LED installing plate 2 as shown in Figure 4.Led light source 1 equidistant 10 row, 10 row are installed on the LED array installing plate 2, and constant current source 4 links to each other with each led light source 1 by P.e.c., realizes power supply separately and switch control.
Fig. 5 is the constant-current source circuit figure that the embodiment of the invention adopts.The constant current source chip adopts AMC7110DB, output continuous current 20mA.Pin one, 2 are the electric current input, LEDEN is a HF switch, connected control system; 4,5,6 connect three LED power supplys 1 respectively, 20mA is provided constant-current driving.According to LED quantity what, can adopt a plurality of constant current source module parallel operations.
Fig. 6 is the embodiment of the invention 1 a resulting quasi-continuous spectrogram, and the wavelength interval of led light source group is 20nm, and the centre wavelength scope is 800nm～1780nm.
Fig. 7 is the embodiment of the invention 2 resulting quasi-continuous spectrograms, and the wavelength interval of led light source group is 10nm, and the centre wavelength scope is 1390nm～400nm.
Claims (9)
1, a kind of quasi-continuous beam splitting system based on the narrow-band LED light sources is characterized in that: comprise narrow-band LED light sources, led light source driving circuit, LED installing plate, stepper motor, control system, the narrow-band LED light sources is made up of several narrow-band LED light sources; The narrow-band LED light source is installed on the LED installing plate and with the led light source driving circuit by the order of centre wavelength increasing or decreasing and links to each other; Step motor drive LED installing plate moves, and control system makes the led light source driving circuit conducting that moves into place; The rotating speed and the stand-by time of stepper motor are controlled by control system.
2, quasi-continuous beam splitting system as claimed in claim 1 is characterized in that: described LED installing plate is a disc, is provided with several mounting holes along circumference and is used to install the narrow-band LED light source.
3, quasi-continuous beam splitting system as claimed in claim 1 is characterized in that: described LED installing plate is square, is provided with some mounting holes and is used to install the narrow-band LED light source by the arrangement of array formula.
4, quasi-continuous beam splitting system as claimed in claim 1 is characterized in that: the spectral bandwidth of described narrow-band LED light source is less than 20nm, and the angle of divergence is less than 15 °.
5, quasi-continuous beam splitting system as claimed in claim 1 is characterized in that: the centre wavelength scope of described led light source group is 200nm～2500nm.
6, quasi-continuous beam splitting system as claimed in claim 1 is characterized in that: described narrow-band LED light sources is made up of 5-500 narrow-band LED light source.
7, quasi-continuous beam splitting system as claimed in claim 1 is characterized in that: the narrow-band LED light source is spaced apart 5～50nm increasing or decreasing by centre wavelength in the described led light source group.
8, quasi-continuous beam splitting system as claimed in claim 1 is characterized in that: described led light source driving circuit adopts constant-current source circuit.
9, quasi-continuous beam splitting system as claimed in claim 1 is characterized in that: after described led light source is luminous, collimate by collimation lens set, emergent light intensity is regulated by exit slit.
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|---|---|---|---|
| CN200910152609A CN101666679A (en) | 2009-09-10 | 2009-09-10 | Quasi-continuous light splitting system based on narrow-band LED light source group |
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| CN200910152609A CN101666679A (en) | 2009-09-10 | 2009-09-10 | Quasi-continuous light splitting system based on narrow-band LED light source group |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507443A (en) * | 2011-10-31 | 2012-06-20 | 中国科学院长春光学精密机械与物理研究所 | Broadband multi-LED light source synthesizer for near infrared spectroscopy analysis |
| CN103983430A (en) * | 2014-04-25 | 2014-08-13 | 中国科学院长春光学精密机械与物理研究所 | Device and method for testing out-band relative spectral responsivity of solar blind ultraviolet image intensifier |
| CN104457983A (en) * | 2014-12-30 | 2015-03-25 | 青岛市光电工程技术研究院 | Programmable multi-spectral uniform light source and control method thereof |
| CN107480589A (en) * | 2017-07-07 | 2017-12-15 | 广东欧珀移动通信有限公司 | Infrared light supply component and electronic installation |
| CN109812730A (en) * | 2019-01-29 | 2019-05-28 | 山东省科学院海洋仪器仪表研究所 | A kind of the low-power consumption wide spectrum LED light source and luminescent method of single-point continuous scanning |
| CN114136440A (en) * | 2021-10-29 | 2022-03-04 | 交通运输部公路科学研究所 | Portable retroreflection luminosity and chromaticity combined measurement method and device |
-
2009
- 2009-09-10 CN CN200910152609A patent/CN101666679A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507443A (en) * | 2011-10-31 | 2012-06-20 | 中国科学院长春光学精密机械与物理研究所 | Broadband multi-LED light source synthesizer for near infrared spectroscopy analysis |
| CN103983430A (en) * | 2014-04-25 | 2014-08-13 | 中国科学院长春光学精密机械与物理研究所 | Device and method for testing out-band relative spectral responsivity of solar blind ultraviolet image intensifier |
| CN104457983A (en) * | 2014-12-30 | 2015-03-25 | 青岛市光电工程技术研究院 | Programmable multi-spectral uniform light source and control method thereof |
| CN107480589A (en) * | 2017-07-07 | 2017-12-15 | 广东欧珀移动通信有限公司 | Infrared light supply component and electronic installation |
| WO2019007141A1 (en) * | 2017-07-07 | 2019-01-10 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Infrared light source component and electronic device |
| CN109812730A (en) * | 2019-01-29 | 2019-05-28 | 山东省科学院海洋仪器仪表研究所 | A kind of the low-power consumption wide spectrum LED light source and luminescent method of single-point continuous scanning |
| CN114136440A (en) * | 2021-10-29 | 2022-03-04 | 交通运输部公路科学研究所 | Portable retroreflection luminosity and chromaticity combined measurement method and device |
| CN114136440B (en) * | 2021-10-29 | 2023-09-08 | 交通运输部公路科学研究所 | Portable retroreflection luminosity and chromaticity combined measurement method and device |
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Open date: 20100310 |