CN107343342A - Standard sources - Google Patents
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- Publication number
- CN107343342A CN107343342A CN201710714185.6A CN201710714185A CN107343342A CN 107343342 A CN107343342 A CN 107343342A CN 201710714185 A CN201710714185 A CN 201710714185A CN 107343342 A CN107343342 A CN 107343342A
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- China
- Prior art keywords
- operational amplifier
- output end
- phase
- light emitting
- led
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- 230000033228 biological regulation Effects 0.000 claims abstract description 13
- 230000007935 neutral effect Effects 0.000 claims abstract description 13
- 238000004891 communication Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000005622 photoelectricity Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000003018 immunoassay Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a kind of standard sources, the control output end of single-chip microcomputer first is connected with digital regulation resistance control signal, and digital regulation resistance reference voltage output terminal is connected with differential operational amplifier in-phase end, and differential operational amplifier output end is connected with LED positive poles；Emission side positioned at LED is interval with neutral-density filter and photomultiplier, LED the same side is provided with photodiode, the photoelectric current output end of photodiode is connected with operational amplifier end of oppisite phase, operational amplifier in-phase end is grounded, operational amplifier output terminal is connected with differential operational amplifier end of oppisite phase, multichannel analog switching branches are connected with operational amplifier end of oppisite phase and output end, each channel output end of multichannel analog switch is connected by resistance with operational amplifier output terminal respectively, the control signal of multichannel analog switch and the second control output end of single-chip microcomputer connect.Advantage of the present invention is embodied in realization and more completely examines the photomultiplier linearity.
Description
Technical field
The present invention relates to light source, more particularly, to standard sources.
Background technology
Standard sources refers to simulate the artificial light sources under various ambient lights, allows production plant or laboratory is non-at-scene also can
Obtain the illuminating effect basically identical with the light source under these specific environments；At present, standard sources uses LED more（Light-emitting diodes
Pipe）As standard sources.Photomultiplier has been applied to various as weak optical signal detection sensor key componentses
Industrial occasions, such as the single photon counting module of Full-automatic chemiluminescence immunoassay analysis meter, but immune point of Full-automatic chemiluminescence
Analyzer is to be used for clinical examination analysis field, therefore higher to the accuracy requirement of photomultiplier tube signal detection.
China Patent Publication No. CN105246190A discloses the standard light for Full-automatic chemiluminescence immunoassay analysis meter
Source, in the standard sources, the light that LED sends is received using photodiode, existing deficiency is：1st, using voltage-stabilized power supply circuit
Or constant-current source circuit power supply, circuit design are complex；2nd, LED and photodiode need into certain established angle when mounted
Degree, increase the design difficulty of standard sources；3rd, other wave bands are eliminated using with the optical filter of LED emission wavelength same bands
Light, but the fluctuation of light can not be eliminated so that standard sources luminous value can not cover the linearly interval of photomultiplier.
The content of the invention
Present invention aims at provide the light standard light source that a kind of fluctuation is small, luminous value covering section is wide.
To achieve the above object, the present invention takes following technical proposals：
Standard sources of the present invention, including the control computer being connected with single chip communication, the single-chip microcomputer first control
Output end is connected with digital regulation resistance control signal, the digital regulation resistance reference voltage output terminal and differential operational amplifier
U1 in-phase end connection, the differential operational amplifier U1 output ends are connected with LED light emitting diode positive poles；Positioned at the LED
The emission side of light emitting diode is arranged at intervals with neutral-density filter and photomultiplier, positioned at the same of LED light emitting diodes
Side is provided with photodiode, and the photoelectric current output end of the photodiode is connected with operational amplifier U2 end of oppisite phase,
The operational amplifier U2 in-phase ends ground connection, operational amplifier U2 output ends are connected with differential operational amplifier U1 end of oppisite phase,
Multichannel analog switching branches are connected with output end in operational amplifier U2 end of oppisite phase, the multichannel analog switchs every
Individual channel output end is connected by resistance with operational amplifier U2 output end respectively, the control signal of multichannel analog switch
It is connected with the second control output end of single-chip microcomputer.
Advantage major embodiment of the present invention is in the following areas：
1st, the limitation to different capacity LED is met, for the LED of excessive power multiple neutral-density filters can be selected to fold
Add use.
2nd, by neutral-density filter to light intensity attenuation, the fluctuation of light is eliminated.The fluctuation refers to：Due to
LED caused by LED manufacture factors itself and circuit are unstable light it is unstable, show as luminous intensity at the numerical value on
Lower fluctuation.Use OD values overall light intensity can be reduced into 99% for 2.0 neutral-density filter, while will can also fluctuate
Than reducing by 99%.The neutral-density filter of different OD values is chosen according to the actual conditions of luminous intensity.
3rd, test result indicates that, light intensity is decayed by neutral-density filter, specificity and ripple to eliminating light
Dynamic property has good action.
4th, constant-current source, source of stable pressure are not used, has saved circuit cost, simplify circuit structure.
5th, the light-metering linear zone field width of standard sources luminous value covering photomultiplier, realizes and more completely examines photoelectricity times
Increase pipeline degree.
Brief description of the drawings
Fig. 1 is the circuit principle structure block diagram of the present invention.
Embodiment
Embodiments of the invention are elaborated below in conjunction with the accompanying drawings, the present embodiment using technical solution of the present invention before
Put and implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to down
State embodiment.
As shown in figure 1, standard sources of the present invention, including the control computer being connected with single chip communication, it is described
The control output end of single-chip microcomputer first is connected with digital regulation resistance control signal, the digital regulation resistance reference voltage output terminal with
Differential operational amplifier U1 in-phase end connection, the differential operational amplifier U1 output ends connect with LED light emitting diodes positive pole
Connect；Emission side positioned at the LED light emitting diodes is arranged at intervals with neutral-density filter and photomultiplier, positioned at LED
The same side of light emitting diode is provided with photodiode, photoelectric current output end and the operational amplifier U2 of the photodiode
End of oppisite phase connection, operational amplifier U2 in-phase ends ground connection, operational amplifier U2 output ends and differential operational amplifier U1
End of oppisite phase connection, be connected with multichannel analog switching branches in operational amplifier U2 end of oppisite phase and output end, it is described more logical
Each channel output end of road analog switch is connected by resistance with operational amplifier U2 output end respectively, and multichannel analog is opened
The control signal of pass and the second control output end of single-chip microcomputer connect.
Operation principle of the present invention is summarized as follows：
Control computer is put with microcontroller communication, single-chip microcomputer by way of bus by adjusting digital regulation resistance for differential operational
Big device U1 provides reference voltage, and differential operational amplifier U1 powers after the reference voltage is amplified for LED light emitting diodes, light
Electric diode converts optical signal into current signal, current signal is through excessive logical by receiving the reflected lights of LED light emitting diodes
Road analog switch selects different resistance to convert the current to different voltage, and difference letter is provided for differential operational amplifier U1
Number, differential operational amplifier U1 powers after two differential signals are amplified to LED light emitting diodes, sends out LED light emitting diodes
Light is stable.It is a wide range of switching that luminous value can be achieved that multichannel analog switch, which switches different resistance, passes through digital regulation resistance
Luminous value is finely adjusted.LED light emitting diodes and photoelectric diode are horizontally mounted, it is not necessary into certain setting angle, this
It is because LED light emitting diodes, neutral-density filter, photodiode three pass through the continuous of light in a space
Reflection can be achieved with feedback control.
By selecting the i.e. piece of neutral density optical filtering of different densities to meet the detection range of different type photomultiplier,
And meet the distance of LED light emitting diode range photomultipliers and influence luminous intensity.
The neutral-density filter Type Selection Principle of different 0D values：
The lime light that type selecting needs to consider has:The luminous intensity of LED light emitting diodes, the detection range of photomultiplier, light source
With photomultiplier apart from size.Determined according to the range of the luminous intensity of LED light emitting diodes and photomultiplier basic
Light intensity decays ratio；Further according to the distance of LED light emitting diodes and photomultiplier, according to the aerial decay formula of light
The light intensity decays ratio under the distance is estimated, the neutral-density filter of suitable 0D values is selected according to two attenuation ratios.
Differential operational amplifier U1 and operational amplifier U2 composition circuit theory be：
The electric current that operational amplifier U2 is made up of inverting amplifier turns potential circuit, in-phase end ground connection, and end of oppisite phase passes through photoelectricity
Diode is grounded, and feedback circuit is made up of multichannel analog switch and multiple resistance R1, R2, Rn, and multichannel analog switchs every
A resistance is connected all the way forms a backfeed loop.Operational amplifier U2 outputs carry for differential operational amplifier U1 end of oppisite phase
For reverse voltage
Differential operational amplifier U1 in-phase ends provide reference voltage by digital regulation resistance, and end of oppisite phase is put by resistance Ri with computing
Big device U2 output ends are connected, and output end load is LED light emitting diodes.
Control computer sends associated light parameter by bus mode to single-chip microcomputer, and single-chip microcomputer is by controlling digital current potential
The selection of device and multichannel analog switch, it is the process of a transient state first, photodiode reception light is constant, produces constant
Electric current, voltage is changed into by operational amplifier U2 and provides constant reverse voltage for differential operational amplifier U1 end of oppisite phase, it is differential
Operational amplifier U1 in-phase ends provide in-phase voltage by digital regulation resistance, are LED light-emitting diodes by differential operational amplifier U1
Pipe provides driving voltage, and driving LED lights, and the light value that now photodiode receives changes, and produces electricity
Stream also changes, and operational amplifier U2 output voltage also changes, and differential operational amplifier U1 reverse voltages change, poor
Dynamic operational amplifier U1 output changes so that LED light emitting diode driving voltages, which change, changes luminous quantity, until photoelectricity
Electric current caused by diode reaches stable, LED lumination of light emitting diode stabilization；Photodiode has adjustment effect.
Multichannel analog switch can be such that operational amplifier U2 output voltage changes on a large scale, pass through differential operational amplifier
U1 changes the driving voltage of LED light emitting diodes, enables the luminous quantity Discrete control of LED light emitting diodes, passes through digital electricity
The micro-positioning regulators of position device, make the luminous quantities of LED light emitting diodes each section can small range regulation, increase LED lights
The control accuracy of LED lighting amount.
Claims (1)
- A kind of 1. standard sources, it is characterised in that：Including the control computer being connected with single chip communication, the single-chip microcomputer first Control output end is connected with digital regulation resistance control signal, and the digital regulation resistance reference voltage output terminal is put with differential operational Big device U1 in-phase end connection, the differential operational amplifier U1 output ends are connected with LED light emitting diode positive poles；Positioned at described The emission side of LED light emitting diodes is arranged at intervals with neutral-density filter and photomultiplier, positioned at LED light emitting diodes The same side is provided with photodiode, and the photoelectric current output end of the photodiode connects with operational amplifier U2 end of oppisite phase Connect, the operational amplifier U2 in-phase ends ground connection, operational amplifier U2 output ends and differential operational amplifier U1 end of oppisite phase connect Connect, multichannel analog switching branches, the multichannel analog switch are connected with operational amplifier U2 end of oppisite phase and output end Each channel output end be connected respectively by resistance with operational amplifier U2 output end, multichannel analog switch control it is defeated Enter end to be connected with the second control output end of single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710714185.6A CN107343342A (en) | 2017-08-18 | 2017-08-18 | Standard sources |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710714185.6A CN107343342A (en) | 2017-08-18 | 2017-08-18 | Standard sources |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107343342A true CN107343342A (en) | 2017-11-10 |
Family
ID=60215819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710714185.6A Pending CN107343342A (en) | 2017-08-18 | 2017-08-18 | Standard sources |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107343342A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005121418A (en) * | 2003-10-15 | 2005-05-12 | Yokogawa Electric Corp | Light intensity measuring system and light intensity measuring method |
| CN101354287A (en) * | 2007-07-24 | 2009-01-28 | 杭州远方光电信息有限公司 | Spectrometer and method for correcting the same |
| CN201875447U (en) * | 2010-06-12 | 2011-06-22 | 北京众合百克科学仪器技术有限公司 | Standard light source for chemical illumination immunity analysis instrument |
| CN202907263U (en) * | 2012-09-20 | 2013-04-24 | 肖应梅 | Slow-starting constant-current control circuit for LED driving power supply |
| CN105246190A (en) * | 2015-09-02 | 2016-01-13 | 深圳市新产业生物医学工程股份有限公司 | Standard light source and chemiluminescence immunity analyzer using standard light source |
| CN207150904U (en) * | 2017-08-18 | 2018-03-27 | 安图实验仪器(郑州)有限公司 | Standard sources |
-
2017
- 2017-08-18 CN CN201710714185.6A patent/CN107343342A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005121418A (en) * | 2003-10-15 | 2005-05-12 | Yokogawa Electric Corp | Light intensity measuring system and light intensity measuring method |
| CN101354287A (en) * | 2007-07-24 | 2009-01-28 | 杭州远方光电信息有限公司 | Spectrometer and method for correcting the same |
| CN201875447U (en) * | 2010-06-12 | 2011-06-22 | 北京众合百克科学仪器技术有限公司 | Standard light source for chemical illumination immunity analysis instrument |
| CN202907263U (en) * | 2012-09-20 | 2013-04-24 | 肖应梅 | Slow-starting constant-current control circuit for LED driving power supply |
| CN105246190A (en) * | 2015-09-02 | 2016-01-13 | 深圳市新产业生物医学工程股份有限公司 | Standard light source and chemiluminescence immunity analyzer using standard light source |
| CN207150904U (en) * | 2017-08-18 | 2018-03-27 | 安图实验仪器(郑州)有限公司 | Standard sources |
Non-Patent Citations (1)
| Title |
|---|
| 第四机械工业部《农用电子产品资料汇编》编辑组: "《实验室生物安全管理与实验室安全评价认可标准实用手册 中》", 第四机械工业部《农用电子产品资料汇编》编辑组 * |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171110 |