CN1912579A - COD photoelectric detection device - Google Patents
COD photoelectric detection device Download PDFInfo
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- CN1912579A CN1912579A CN 200610053264 CN200610053264A CN1912579A CN 1912579 A CN1912579 A CN 1912579A CN 200610053264 CN200610053264 CN 200610053264 CN 200610053264 A CN200610053264 A CN 200610053264A CN 1912579 A CN1912579 A CN 1912579A
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- light
- light path
- cod
- circuit board
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Abstract
A COD photoelectric detection device is prepared as forming the emitting light source by at least two LED emitting light paths with different wavelength, setting light path detector formed by photo detector and measurement operation light path as well as photocell behind two LED and connecting it to control circuit board to make analysis of detection result, setting beam splitter before two light detector separately and leading out reference compensation light path from each of two said detectors and connecting them to reference detector as well as connecting feedback to control circuit board.
Description
Technical field
What the present invention relates to is that a kind of COD of being applicable to detects and uses, and according to the project of required detection, change light source after, can be widely used in the photoelectric detection system of instrumental analysis such as environmental protection, chemical analysis, doctor's instrument, medicine analysis.
Background technology
Present COD photoelectric detection system generally adopts single wavelength to detect, and detects wavelength generally at 600-620nm, and its primary structure is formed and comprised transmitting illuminant, light inspection device, surveying work light path, photoelectric cell and control circuit board etc.For the method for colorimetric detection, product generally adopts 600-630nm to detect Cr both at home and abroad at present at present
3+Also there is the product of small part producer to adopt the 380-420nm wavelength to detect Cr
6+, to detect low concentration COD.Above-mentioned in addition detecting instrument is subjected to the influence of external environments such as temperature easily when detecting, can have the problem of zero point drift in testing process, thereby has influenced the stability and the accuracy that detect.Because at present the photoelectric detection system ubiquity detects the phenomenon of zero drift, thereby before each the detection, all needs proofreading and correct zero point, thereby increased testing staff's workload, make it use to go up and have inconvenience, the not high defective of precision.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned existence, and the design of a kind of double light path, easy to use, COD photoelectric detection system that accuracy of detection is high are provided.Which comprises at least transmitting illuminant, light inspection device, surveying work light path, photoelectric cell and control circuit board, described transmitting illuminant is made up of the light emitting diodes of two emission different wave length light paths at least, is respectively arranged with behind two light emitting diodes to examine light path detecting device that device, surveying work light path, photoelectric cell constitute by light and be connected to and do the testing result analysis on the control circuit board.
Be provided with respectively by the light beam dispenser before described two light inspection device and also lead to reference compensation light path separately to reference detector, feedback is connected to control circuit board.
When the present invention utilizes the light wave of certain wavelength to pass through liquid, proportional this principle of concentration of material in absorbed light intensity and this liquid; Be Cr
3+Ion near the wavelength of 610nm, Cr
6+Ion has bigger absorption value near the wavelength of 400nm; At COD
CrTesting process in, by Cr after the detection reaction
3+Perhaps Cr
6+Concentration, can extrapolate COD
CrValue.Compare with the electrode method, adopt the method for Photoelectric Detection, has the advantage that detecting device and fluid to be measured need not directly to contact, this contactless detection method, make detecting device not need to contact with the extremely strong digestion solution of corrosivity, greatly facilitate the maintenance work of instrument, prolonged the serviceable life of detecting device.
The present invention is by detecting two indexs simultaneously, and two testing results are carried out hybrid operation, finally draws the COD value; Owing to adopted the light-source system of two-way single wavelength, omitted beam splitting systems such as grating or prism simultaneously, made to detect to have higher specificity.The present invention can also be according to the required optical source wavelength of project of need detection, behind the replacing light source, can detect in the scope of other wavelength.Owing to adopted the feedback control system of closed loop, can effectively eliminate the detection drift of instrument; Thereby it is simple in structure that the present invention is had, easy to use, reliable, characteristics such as accuracy of detection height.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is that dual wavelength feedback of the present invention is waitd upon clothes light path detection schematic diagram.
Embodiment
The present invention will be described in detail below in conjunction with accompanying drawing: Fig. 1, shown in Figure 2, the utility model include transmitting illuminant 1, light inspection device 2, surveying work light path 3, photoelectric cell 4 and control circuit board 5 etc. at least.Described transmitting illuminant 1 is made up of the light emitting diodes of two emission different wave length light paths, is respectively arranged with behind two light emitting diodes to examine two-way light path detecting device that device 2, surveying work light path 3, photoelectric cell 4 constitute by light and be connected to and do the testing result analysis on the control circuit board 5.Be respectively arranged with light beam dispenser 6 and lead to reference compensation light path 7 separately to reference detector 8 before described two light inspection device 2, feedback is connected to control circuit board 5.
Each of pick-up unit of the present invention detects wavelength and all designs for double light path, ultimate principle that it adopts and common spectrophotometer are basic identical, adopted the center emission wavelength be 610 or the light emitting diode of 400nm as emitting components, and light signal is converted into electric signal by photoelectric cell.
The present invention sets up following mathematical model, and the testing result that two detecting devices obtain is analyzed, and finally obtains testing result.
400nm detected value: C1=f (T1)
610nm detected value: C2=f (T2) T1, T2 are absorbance
Final detected value: C=F (C1, C2)
For eliminating the drifting problem in the instrument detecting process, adopted the accurate constant current control self compensating system of closed loop, by a feedback transducer, the detection drift that environmental factors such as light source Yin Wendu are caused compensates automatically, has effectively eliminated the drawback of this disturbing effect testing result correctness and stability.
Claims (2)
1, a kind of COD photoelectric detection system, which comprises at least transmitting illuminant, light inspection device, surveying work light path, photoelectric cell and control circuit board, it is characterized in that described transmitting illuminant (1) is made up of the light emitting diodes of two emission different wave length light paths at least, be respectively arranged with two-way light path detecting device by light inspection device (2), surveying work light path (3), photoelectric cell (4) formation behind two light emitting diodes and be connected on the control circuit board (5) and do the testing result analysis.
2, COD photoelectric detection system according to claim 1, it is characterized in that preceding the setting respectively by light beam dispenser (6) of described two light inspection devices (2) also leads to reference compensation light path (7) separately to reference detector (8), feedback is connected to control circuit board (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610053264 CN1912579A (en) | 2006-08-30 | 2006-08-30 | COD photoelectric detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610053264 CN1912579A (en) | 2006-08-30 | 2006-08-30 | COD photoelectric detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1912579A true CN1912579A (en) | 2007-02-14 |
Family
ID=37721575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610053264 Pending CN1912579A (en) | 2006-08-30 | 2006-08-30 | COD photoelectric detection device |
Country Status (1)
| Country | Link |
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| CN (1) | CN1912579A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101329254B (en) * | 2007-06-18 | 2010-09-08 | 北京安控科技股份有限公司 | Device for detecting chemical oxygen demand |
| CN103487415A (en) * | 2012-06-15 | 2014-01-01 | 上海棱光技术有限公司 | Monochromatic light beam excitation apparatus |
| CN107340250A (en) * | 2017-07-27 | 2017-11-10 | 山西鑫华翔科技发展有限公司 | Double light-metering light path COD on-line analysis measuring instruments |
| CN107860718A (en) * | 2017-12-08 | 2018-03-30 | 杭州驱歌科技有限公司 | A kind of water analysis outfit |
| CN108663328A (en) * | 2017-03-28 | 2018-10-16 | 中国科学院大学 | Light noise-filtering device suitable for optics water quality measurement system |
-
2006
- 2006-08-30 CN CN 200610053264 patent/CN1912579A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101329254B (en) * | 2007-06-18 | 2010-09-08 | 北京安控科技股份有限公司 | Device for detecting chemical oxygen demand |
| CN103487415A (en) * | 2012-06-15 | 2014-01-01 | 上海棱光技术有限公司 | Monochromatic light beam excitation apparatus |
| CN108663328A (en) * | 2017-03-28 | 2018-10-16 | 中国科学院大学 | Light noise-filtering device suitable for optics water quality measurement system |
| CN108663328B (en) * | 2017-03-28 | 2020-06-30 | 中国科学院大学 | Optical noise filtering device suitable for optical water quality measuring system |
| CN107340250A (en) * | 2017-07-27 | 2017-11-10 | 山西鑫华翔科技发展有限公司 | Double light-metering light path COD on-line analysis measuring instruments |
| CN107860718A (en) * | 2017-12-08 | 2018-03-30 | 杭州驱歌科技有限公司 | A kind of water analysis outfit |
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