CN101424569B - Ultraviolet intensity fluorescent differential detecting method and apparatus - Google Patents
Ultraviolet intensity fluorescent differential detecting method and apparatus Download PDFInfo
- Publication number
- CN101424569B CN101424569B CN2008102184324A CN200810218432A CN101424569B CN 101424569 B CN101424569 B CN 101424569B CN 2008102184324 A CN2008102184324 A CN 2008102184324A CN 200810218432 A CN200810218432 A CN 200810218432A CN 101424569 B CN101424569 B CN 101424569B
- Authority
- CN
- China
- Prior art keywords
- visible
- light detector
- light
- ultraviolet
- intensity
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The invention discloses an ultraviolet radiation intensity fluorescence difference testing method and a device. The invention adopts two visible light detectors, wherein the light accepting surface of the first visible light detector is coated with a transparent and even lamina of ultraluminescence material which emits fluorescent light with the visible light band under the irradiation of ultraviolet ray, an electrical signal generated by the first visible light detector shows the intensity sum of the fluorescent light generated by ultraviolet ray and visible light, an electrical signal generated by the second visible light detector shows the intensity of the visible light, an electrical signal showing the intensity of the ultraviolet ray is obtained by difference amplifying the two electrical signals, and the electrical signal is calculated to the ultraviolet ray intensity by a singlechip after converted by AD. The invention adopts the ultraluminescence and difference theories, can automatically remove the influence of bias light, and measures the ultraviolet ray with high accuracy.
Description
Technical field
The invention belongs to photoelectric detection technology field, specifically is a kind of ultraviolet intensity fluorescent differential detecting method and device.
Background technology
Along with science and technology development, people have goed deep into ultraviolet band to the research of spectrum with utilization.No matter be the monitoring of daily UV intensity, or the detection of UV intensity on experiment, medical science or the military purposes, the importance of all having given prominence to ultraviolet ray intensity meter.
The spectral response of photoelectric devices such as common photoelectric pond and photodiode is not suitable for directly ultraviolet ray being detected at visible-range; Though photomultiplier can be used for ultraviolet detection, its volume is bigger, and adopts the high-voltage power supply power supply of high stability, and power consumption is big, uses inconvenient; Optothermal detector is lower to ultraviolet responsiveness, is difficult to detect weak ultraviolet ray, and is difficult for practicability.
The nearly more than ten years grow up with GaP, GaAsP, SiC and TiO
2Deng still having certain response at visible light for the ultraviolet light detector of material.As G12119, G1126 type ultraviolet light photo diode, its spectral response range is at 190～680nm, and peak value is at the 610nm place.Therefore, usually add filter glass in its front, this can cause the reduction of ultraviolet detection sensitivity.When carrying out the solar ultraviolet measurement, often there is stronger visible light (or claiming bias light), this can influence the accuracy of measurement.
Summary of the invention
The objective of the invention is to deficiency, a kind of simple, practical ultraviolet intensity fluorescent differential detecting method is provided at existing uitraviolet intensity detection technique.
Another object of the present invention provides a kind of ultraviolet intensity fluorescent Differential Detection device.
Groundwork principle of the present invention is: adopt two on all four general visible detectors of profile, size and performance parameter, as photodiode or photoelectric cell.One light receiving surface is coated the uniform ultraviolet fluorescent material thin layer of layer of transparent therein, makes it launch the fluorescence of visible light wave range under the irradiation of ultraviolet light, thereby causes that this photodetector produces the electric signal output that is proportional to ultraviolet light and visible light; In addition, closely the light receiving surface of another visible-light detector side by side is left intact, and its spectral response range is minimum to the ultraviolet light reaction at visible region, only produces the electric signal that is proportional to visual intensity, as background or reference signal.Two-way output electric signal just can obtain being proportional to the electric signal of ultraviolet light after differential amplifier circuit is handled.Handle through AD conversion and single-chip microcomputer again, obtain tested ultraviolet intensity.
A kind of ultraviolet intensity fluorescent differential detecting method, it is characterized in that adopting two visible-light detectors, wherein the light receiving surface of first visible-light detector scribbles the uniform ultraviolet fluorescent material thin layer of layer of transparent, described ultraviolet fluorescent material is launched the fluorescence of visible light wave range under ultraviolet irradiation, fluorescence and visible light intensity sum that the electric signal reflection ultraviolet ray that first visible-light detector produces produces, the electric signal reflection visual intensity that second visible-light detector produces, two path signal obtains reflecting the electric signal of uitraviolet intensity after difference is amplified, this electric signal is converted into uitraviolet intensity by single-chip microcomputer after the AD conversion.
A kind of ultraviolet intensity fluorescent Differential Detection device, it is characterized in that comprising two visible-light detectors, balanced potentiometer, differential amplifier circuit, A/D convertor circuit, microprocessor and display screen, wherein the light receiving surface of first visible-light detector scribbles the uniform ultraviolet fluorescent material thin layer of layer of transparent, described ultraviolet fluorescent material is launched the fluorescence of visible light wave range under ultraviolet irradiation, the negative pole of first visible-light detector, the negative pole of second visible-light detector links to each other with the adjustable side of balanced potentiometer, the other two ends of balanced potentiometer respectively with the positive pole of first visible-light detector, the positive pole of second visible-light detector links to each other, the positive pole of the positive pole of first visible-light detector and second visible-light detector links to each other with differential amplifier circuit, differential amplifier circuit links to each other with A/D convertor circuit, A/D convertor circuit, display screen all links to each other with single-chip microcomputer.
Further, in order to eliminate the interference of visible fluorescence to second visible-light detector, the annular region around the light receiving surface of first visible-light detector scribbles black ink, and its thickness is bigger than the thickness of ultraviolet fluorescent material thin layer.
Further, for making the entire ultraviolet light detection device higher sensitivity and accuracy are arranged, first visible-light detector and second visible-light detector are the photodetectors of same material.
Further, first visible-light detector and second visible-light detector are gallium arsenide photodetector or silicon photodetector.
Further, described first visible-light detector and second visible-light detector are integrated on the double base detector.
Below from Ultraluminescence and difference measurement principle brief description principle of the present invention and realization.
1, Ultraluminescence
Present most ultraviolet detector spectral response range is to ultraviolet direct detection mainly at ultraviolet band.The present invention then adopts round-about way, with ultraviolet fluorescent material ultraviolet ray is changed into visible light, measures based on visible light again.
A) selection of ultraviolet fluorescent material
Ultraviolet fluorescent material will possess two characteristics: the good and Ultraluminescence efficient height of visible transparency.
Can make ultraviolet ray produce the material of visible fluorescence can be as ultraviolet fluorescent material of the present invention.
B) fluorescent material smears
Owing to be coated in the coating decay certain of the ultraviolet fluorescent material on the photodetector, so when smearing, will consider the problem of its thickness and uniformity coefficient to penetrating of visible light and fluorescence.The thickness of coating can influence the spectral response characteristic of the photodetector that scribbles fluorescent material, the performance of decision detector.Concrete thickness will be according to the profile and the performance parameter of the photodetector of specifically selecting for use, and the decision of concrete experimental data curve.The thickness reference value is generally between 10 μ m to 50 μ m.
Because the fluoresent printing ink physical characteristics is near the paint class, so can adopt the technologies such as surface brushing, spraying, roller coating, blade coating and the spraying of pouring curtain that are fit to most of material.Certainly, can adopt more accurate application process in order more accurately to control thickness, as electrostatic spraying, plating etc.
Consider the scattering process of the photodetector surfaces emitting fluorescence that scribbles fluorescent material, can to the next door be not coated with fluorescent material photodetector impact.So fluorescent ink is only smeared in the central area on photoelectric device surface, annular region coating black printing ink on every side, its thickness is bigger than fluorescent ink thickness, can effectively eliminate the interference of visible fluorescence.
2, select the photodetector of coupling
For guaranteeing that the entire ultraviolet light detection device has higher sensitivity and accuracy, need to select suitable photodetector.The spectral response curve of visible-light detector should be overlapping with the fluorescent spectrum curve of ultraviolet fluorescent material, and promptly both will mate, and just can obtain bigger output signal.
3, ultraviolet ray intensity detects
Do not adopt the method for elimination visible light, the present invention adopts the Differential Detection principle.Because the sunshine area that generally is detected is bigger, and spectrum and intensity distributions are even, utilize the identical but discrepant photodetector of spectral response of two profiles that ultraviolet ray and the visible light that mixes directly received, the mode by difference extracts ultraviolet strength signal.Owing to do not do filtration treatment, the ultraviolet signal authenticity that obtains is higher, and the accuracy of measurement is also higher.
A) differential principle
Detected object generally is not pure ultraviolet ray, has often also comprised visible light, and photoelectric cell or photodiode can responding to visible light, and this must cause UV intensity to detect than mistake.Shown in accompanying drawing 5,6, scribble in the spectral response curve of fluorescent material and the photodetector that is coated with of end at the visible region basically identical, and higher response peak occurred in the ultraviolet region.If will scribble two photodetectors that fluorescent material and end be coated with fluorescent material symmetrically the access differential circuit make probe, just can obtain the ultraviolet ray intensity electric signal at output terminal:
I＝∫[t·i
1(λ)-i
2(λ)]dλ＝t·I
1-I
2 (1)
Wherein, i
1(λ) photocurrent (by Wavelength distribution) for scribbling fluorescent material photoelectric cell or photodiode; i
2(λ) be the last photocurrent that scribbles fluorescent material photoelectric cell or diode; T is to scribbling the correction of fluorescent material photoelectric cell or diode signal, because fluoresent coating can have certain influence to input signal.I
1, I
2It then is total current signal that photoelectric cell or photodiode receive.After the calculation process through differential amplification and single-chip microcomputer, just can extract ultraviolet intensity level.
B) Tan Tou structure
The differential configuration of probe is had relatively high expectations to symmetry.So if select discrete component for use, two photodetectors are except the structural parameters unanimity, preferably parallel connecting airtight together,, sensitive surface is in same plane, to guarantee background or reference light unanimity.In addition, balancing controls are set in circuit, to compensate differences such as background variation owing to circuit is not exclusively symmetrical, electrical property is inconsistent and the fluorescent material coating causes.
For consistance and the symmetry that guarantees photo detector, the probe device also can adopt polynary photoelectric device, as double base detector, Four-Element Detection device or quadrant detector etc.With the double base detector is example, is coated with the fluorescent material thin layer therein on the monobasic, and one is not coated with, and the access differential circuit is made input signal respectively again, as shown in Figure 8.
C) probe sensitive area area
In order to make two photodetectors in the differential configuration be subjected to the light unanimity, not only light-receiving area identical, have in certain size and the light-receiving area and want illumination even.If be applied to detect the UV intensity of sunshine, should adopt the less photoelectric device of light-receiving area to help weakening the requirement of directivity aspect, reach the effect that is subjected to the light unanimity.
The present invention is based on that the deficiency of present ultraviolet detector proposes, and has given prominence to the characteristics of the following aspects:
At first be the influence that the present invention can eliminate bias light automatically, measure ultraviolet light degree of accuracy height.Utilize Ultraluminescence and differential principle, deduct the interference of the parasitic light in visible light in the sunshine or the environment effectively, the uitraviolet intensity in the surround lighting that changes has the incomparable advantage of single-element detector in detecting.
Next superiority of effectiveness of the present invention.This device has adopted normal optical electric explorer and fluorescent material to realize ultraviolet measurement, low price, is easy to promote.Solar ultraviolet day the blind area constantly dwindle, today of people's growing interest living environment, this has positive role.
Be the simplification of the present invention and device in addition.By selecting suitable small-sized or microdevice for use, this device can be made portable construction, as same small-sized counter or a wrist-watch.This also brings convenience for promoting.
Description of drawings
Fig. 1 is the block diagram of pick-up unit of the present invention;
Fig. 2 is the circuit theory synoptic diagram of embodiment 1 detector and difference channel;
Fig. 3 is embodiment 1AD change-over circuit and single chip circuit principle schematic;
Fig. 4 is embodiment 1 a fluoresent printing ink excitation spectrum;
Fig. 5 is embodiment 1 a fluoresent printing ink fluorescence emission spectrum;
Fig. 6 is the spectral response that embodiment 1 is not coated with the silicon photoelectric diode of fluoresent printing ink;
Fig. 7 is the spectral response that embodiment 1 scribbles fluoresent printing ink silicon materials photodiode;
Fig. 8 is a binary panel detector structure synoptic diagram.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the block diagram of pick-up unit of the present invention, as shown in Figure 1, the signal of first visible-light detector and second visible-light detector is input to single-chip microcomputer behind differential amplifier circuit, A/D convertor circuit, be converted into the uitraviolet intensity value by single-chip microcomputer, is shown by display screen.
Fig. 2 is the circuit theory synoptic diagram of present embodiment detector and difference channel; Among the figure, 1 is explorer portion, comprises two visible-light detectors, its negative pole is connected together, and link to each other with the adjustment end of balanced potentiometer, the other two ends of balanced potentiometer link to each other with the positive pole of two visible-light detectors respectively, and the positive pole of two visible-light detectors is connected to difference channel 2.
Fig. 3 is present embodiment A/D convertor circuit and single chip circuit principle schematic; A/D convertor circuit 3 adopts the TLC2543 chip, and single chip circuit 4 is made of 89C51 chip and peripheral circuit thereof.The output signal of difference channel 2 converts digital signal to through AD conversion chip TLC2543 and sends single-chip microcomputer 89C51 to, and 89C51 is converted into uitraviolet intensity by single-chip microcomputer.
In the present embodiment, the ultraviolet fluorescent material on first visible-light detector uses a class fluoresent printing ink.It is mainly by rare earth Ultraluminescence compound and solvent composition.The Ultraluminescence compound is a kind of material that ultraviolet luminous energy is launched visible fluorescence that absorbed.As rare earth element (Sm, Eu, Tb) organic coordination compound, under ultraviolet illumination, launch visible fluorescence.Such ultraviolet fluorescent material itself is colourless or show slightly light yellow, has luminosity height under ultraviolet light, and fluorescent stability is good, is difficult for wearing out, and is easy to be distributed to the medium advantage of various organic solvents.
Rare earth compounding phenanthroline trifluoroacetylacetone (TFA) closes europium Eu (TTA)
3Phen and phenanthroline trifluoroacetylacetone (TFA) close yttrium europium Eu (Y) (TTA)
3Phen (organic ultraviolet fluorescent pigment) can be made into corresponding fluoresent printing ink, and it is red to send light under UV-irradiation.The prescription of the fluoresent printing ink of present embodiment is as shown in table 1:
The preparation prescription of table 1 fluoresent printing ink
| The printing ink kind | Light PVC printing ink/g | Fast solid carbon dioxide/the g of CS1000#719 | Organic ultraviolet fluorescent pigment/g |
| Ultraviolet ray is red down | 84.0 | 4.0 | 2.0 |
In the present embodiment fluoresent printing ink, the organic ultraviolet fluorescent pigment selects for use rare earth compounding phenanthroline trifluoroacetylacetone (TFA) to close europium Eu (TTA)
3Phen.
Respectively above-mentioned fluoresent printing ink excitation spectrum and the fluorescence emission spectrum that actual measurement obtains among Fig. 4 and Fig. 5.As seen its lasing region is in the ultraviolet region, and fluorescence is at the visible light red spectral band, and the fluorescent emission peak value is at 615nm.
Because the emission peak of measuring above-mentioned fluoresent printing ink in the experiment is about 615nm, and the response peak of photodetector also roughly should could be mated in this scope so well.The spectral response range of common silicon photodetector is generally at 400nm ~ 1100nm, and its response peak is about 800nm ~ 900nm.The photronic response peak of gallium arsenide is then more near the emission peak of fluorescent material, about 650nm.As seen, gallium arsenide and silicon photodetector all are first-selected.
Present embodiment adopts silicon photoelectric diode as visible-light detector.Fig. 6 is the spectral response that is not coated with the silicon photoelectric diode of fluoresent printing ink; Fig. 7 is the spectral response that scribbles fluoresent printing ink silicon materials photodiode.Two curves are represented the spectral response of two silicon photoelectric diodes among Fig. 6, Fig. 7, and two curves overlap substantially, mean that the consistance of device is better.From the contrast of Fig. 6, Fig. 7 as can be known, the silicon photoelectric diode that is not coated with fluoresent printing ink does not respond substantially to ultraviolet ray, and scribble fluoresent printing ink silicon materials photodiode ultraviolet ray is had stronger response.
Claims (3)
1. uitraviolet intensity pick-up unit, it is characterized in that comprising two visible-light detectors, balanced potentiometer, differential amplifier circuit, A/D convertor circuit, microprocessor and display screen, wherein the light receiving surface of first visible-light detector scribbles the uniform ultraviolet fluorescent material thin layer of layer of transparent, described ultraviolet fluorescent material is launched the fluorescence of visible light wave range under ultraviolet irradiation, the negative pole of first visible-light detector, the negative pole of second visible-light detector links to each other with the adjustable side of balanced potentiometer, the other two ends of balanced potentiometer respectively with the positive pole of first visible-light detector, the positive pole of second visible-light detector links to each other, the positive pole of the positive pole of first visible-light detector and second visible-light detector links to each other with differential amplifier circuit, differential amplifier circuit links to each other with A/D convertor circuit, A/D convertor circuit, display screen all links to each other with single-chip microcomputer
Fluorescence and visible light intensity sum that the electric signal reflection ultraviolet ray that first visible-light detector produces produces, the electric signal reflection visual intensity that second visible-light detector produces, two path signal obtains reflecting the electric signal of uitraviolet intensity after difference is amplified, this electric signal is converted into uitraviolet intensity by single-chip microcomputer after the AD conversion
Annular region around the light receiving surface of first visible-light detector scribbles black ink, and its thickness is bigger than the thickness of ultraviolet fluorescent material thin layer,
First visible-light detector and second visible-light detector are the photodetectors of same material.
2. uitraviolet intensity pick-up unit according to claim 1 is characterized in that: described first visible-light detector and second visible-light detector are gallium arsenide photodetector or silicon photodetector.
3. uitraviolet intensity pick-up unit according to claim 2 is characterized in that: described first visible-light detector and second visible-light detector are integrated on the double base detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102184324A CN101424569B (en) | 2008-10-17 | 2008-10-17 | Ultraviolet intensity fluorescent differential detecting method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102184324A CN101424569B (en) | 2008-10-17 | 2008-10-17 | Ultraviolet intensity fluorescent differential detecting method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101424569A CN101424569A (en) | 2009-05-06 |
| CN101424569B true CN101424569B (en) | 2010-12-01 |
Family
ID=40615317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102184324A Expired - Fee Related CN101424569B (en) | 2008-10-17 | 2008-10-17 | Ultraviolet intensity fluorescent differential detecting method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101424569B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5798430B2 (en) | 2011-10-03 | 2015-10-21 | 浜松ホトニクス株式会社 | Fluorescence observation apparatus and fluorescence observation method |
| JP6198426B2 (en) * | 2013-03-29 | 2017-09-20 | 浜松ホトニクス株式会社 | Fluorescence observation apparatus and fluorescence observation method |
| CN105444879A (en) * | 2015-12-16 | 2016-03-30 | 天津津芯微电子科技有限公司 | Laser energy acquisition method and laser energy acquisition device |
| JP6788849B2 (en) * | 2017-03-21 | 2020-11-25 | パナソニックＩｐマネジメント株式会社 | Imaging system and method for identifying ultraviolet light emitting points using it |
| CN107421906A (en) * | 2017-06-13 | 2017-12-01 | 淄博前沿医疗器械有限公司 | A kind of photometer of efficiently measurement concentration of ozone gas |
| CN108107335A (en) * | 2017-11-27 | 2018-06-01 | 中山市光圣半导体科技有限责任公司 | A kind of uv-LED device test device and test method |
| CN111081157A (en) * | 2019-12-24 | 2020-04-28 | 维沃移动通信有限公司 | Display module, screen assembly, electronic equipment, prompting method and shooting method |
| CN112839148B (en) * | 2020-12-23 | 2023-03-14 | 北京市农林科学院智能装备技术研究中心 | Camera assembly, electronic equipment and ultraviolet radiation intensity detection method |
-
2008
- 2008-10-17 CN CN2008102184324A patent/CN101424569B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101424569A (en) | 2009-05-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101424569B (en) | Ultraviolet intensity fluorescent differential detecting method and apparatus | |
| CN201281630Y (en) | Detection device for solar light ultraviolet strength | |
| EP3183555B1 (en) | Devices, systems and methods for detecting particles | |
| CN207318734U (en) | A kind of linear array double energy X-ray detector | |
| CN106549076B (en) | A kind of quantum dot light emitting film enhances ultraviolet imagery detector | |
| US8581212B2 (en) | Portable UV monitoring device | |
| CN111308289A (en) | Partial discharge multispectral weak light detection device and method | |
| Ahmed et al. | External quantum efficiency improvement with luminescent downshifting layers: experimental and modelling | |
| CN102103081A (en) | Optical fiber bundle fluorescent sensor | |
| CN103868903A (en) | Quantitative measurement method for absolute photoluminescence quantum efficiency of near infrared quantum shear | |
| CN102103082A (en) | Multi-light path optical fiber fluorescent sensor | |
| Parel et al. | Modelling and experimental analysis of the angular distribution of the emitted light from the edge of luminescent solar concentrators | |
| CN108489605A (en) | Solar blind UV detection device | |
| Okada et al. | Development of near-infrared-emitting scintillators based on rare-earth-doped garnet crystals-Part 1 | |
| CN108092624B (en) | Detection device and detection method for open-circuit voltage distribution of solar cell | |
| CN105628197A (en) | Illumination photometer | |
| Arneodo et al. | Muon tracking system with Silicon Photomultipliers | |
| CN103162942A (en) | Measuring method of down-conversion luminescence film conversion efficiency | |
| KR101825532B1 (en) | Method for detecting radiation and apparatus | |
| CN108152252A (en) | A kind of integration type femtosecond time resolution fluorescence lifetime measurement spectrometer | |
| CN108139326A (en) | With low background signal based on organic fluorescent optical sensor | |
| CN107367335A (en) | Based on cadmium sulfide fibre optic temperature sensor Temperature Demodulation System | |
| CN202403800U (en) | Irradiance meter for aging light source in laboratory | |
| CN102103083A (en) | Array light source induced fluorescent optical fiber sensor | |
| CN105628198B (en) | A kind of electric heating heap-type solar radiation tester and often the determination method of category k values |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101201 Termination date: 20121017 |