CN102798602A - Integrated dual-beam water quality COD on-line detection sensor - Google Patents
Integrated dual-beam water quality COD on-line detection sensor Download PDFInfo
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Abstract
The invention provides an integrated dual-beam water quality COD on-line detection sensor, wherein a UVLED array, a measure light chamber, a reference light chamber and a detection optical path are arranged on a sensor body, the UVLED array is composed of an even number of symmetrically arranged LED lamps and is driven by a drive device, the center of the UVLED array and the center of the detection optical path are collinear; the measure light chamber is a rectangular groove provided at the central section of the sensor body, a collimating mirror and an emergent condenser which are collinear are arranged at two sidewalls of the groove along the axial direction of the sensor body; a second UVLED array arranged on the reference light chamber and the sensor body is collinear with the center of a second detection optical path. According to the invention, the LED array is taken as a light source of the sensor, thereby the structure of the sensor is substantially simplified, the volume and the weight can be substantially reduced, the measure light chamber and the reference light chamber are employed to increase the precision of water quality detection; the sensor is the immersing type integrated sensor which is capable of making an on-line detection on the water quality, thereby the measurement can be more convenient.
Description
Technical field
The present invention relates to the detecting sensor technical field, be specifically related to a kind of integrated twin-beam water-quality COD detecting line sensor that is used for water quality monitoring.
Background technology
COD (Chemical Oxygen Demand; COD) is the important indicator that water quality detects; Be used for reflecting the degree that reducing substances in the water body pollutes, because the reducing substances in the water body is mainly organism, so COD has also reacted water body and has received organic pollution level.The value of COD is more little, explains that water quality receives the organism pollution level light more.
At present, the assay method of COD mainly is divided into the method for chemistry and physics, and traditional chemical method mainly is chemistry titration (potassium dichromate or a potassium permanganate).This method is main with artificial spot sampling, Laboratory Instruments analysis mainly; Have that the monitoring frequency is low, sampling error big, Monitoring Data is disperseed, required time cycle intermediate link long, experience is more, be prone to cause secondary pollution, can not reflect the pollution changing condition in real time, is difficult to satisfy the demand to effective water environment management.
Physical method then is to adopt ultraviolet light (UV) analytic approach, utilizes most of organism to locate the characteristic of absorption at a certain wavelength (such as 254nm), with the irradiation of water body through this specific wavelength ultraviolet light, judges the degree of water pollution from the size of absorbance.In order to reduce the influence to measuring such as turbidity, colourity; Generally all adopt dual wavelength to measure, another wavelength (546nm) is light as a reference, is used to eliminate water body turbidity, colourity etc. to measuring the influence that produces; The advantage of this method need not to add chemical reagent; No non-secondary pollution, and be easy to be implemented in line automation, be easy to instrument operation steady in a long-term and maintenance.
Along with ultra-violet absorption spectrum the deepening continuously of water quality detection area research, adopt the detection method of dual wavelength or a plurality of wave bands a lot.CN200810064473.2 disclosed " a kind of on-line detector of measuring COD concentration by ultraviolet light absorption method " for example; This instrument is made up of light path system, water circuit system, Circuits System and embedded system; As light source, utilize 254nm ultraviolet light absorbance and water body COD to have good correlativity to calculate the COD value with mercury lamp, utilize 546nm visible light absorbance to calculate the water sample turbidity; From the COD value, deduct the error that turbidity brings again, improve measuring accuracy.
Document is (based on novel online water quality (COD) the automonitor design of ultraviolet (UV) principle of absorption, Du Zhen tribute etc., scientific and technological wind; 2011 (18); 48-51) disclosed detector by water system, light path system and data handling system form, testing tool places outside the water body, utilizes the peristaltic pump continous-stable to extract water sample; As light source, adopt the content of dual wavelength monitoring water body COD with xenon lamp equally.For the problem of light source long-term stable operation, through introducing the ionization meter of reference beam, carry out feedback ratio, thereby eliminate nonlinearity erron.
CN200710119027.2 discloses its respective detection device to the former; This device is made up of ultraviolet light source, sample cell, optical splitter, ultra violet intensity detecting device and data processor; Adopt the multi-wavelength ultraviolet measurement; Light intensity according to each wavelength of ultraviolet beam of ultra violet intensity detecting device output is calculated organic absorbance, thereby can in bigger range of application, obtain COD (COD) accurately.
Above prior art all adopts mercury lamp or xenon lamp as light source, but this type of light-source structure design trouble, cost and maintenance cost are higher relatively, and power consumption is quite big, and luminescent lifetime neither be very long.The front all adopts dual wavelength to measure COD for two pieces; Can only measure most of organic content; And reference light can't be eliminated, and small amounts of inorganic thing, trace element and metallic ion cause measured value and not accurate enough to the interference that the organism ultra-violet absorption spectrum produces in the water quality.Bigger a plurality of wave bands come measure CO D value although the latter chooses absorbance; Can improve accuracy to a certain extent, but related coefficient need be utilized chemical gauging when calculating COD, therefore when sewage composition and external condition change; Wavelength band and wave band number thereof need be chosen again; Its related coefficient then also need remeasure, so the measuring process relative complex, so-called real-time can not be guaranteed.
Summary of the invention
Above-mentioned defective to the prior art existence; The present invention solves existing water-quality COD detecting sensor and adopts mercury lamp or xenon lamp as light source; Exist complex structure, cost higher; And power consumption, the problem of luminescent lifetime provides a kind of integrated twin-beam water-quality COD detecting line sensor of new structure.
Solve above-mentioned technical matters, the technical scheme that the present invention adopts is following:
Integrated twin-beam water-quality COD detecting line sensor is characterized in that, comprises sensor body, measuring light chamber and detects light path; The rectangular recess of said measuring light chamber for offering at the sensor body middle part, said measuring light chamber is provided with collimating mirror and the outgoing condenser on same straight line along the axial two side of sensor body; Sensor light source, incident condenser, incident optical, collimating mirror, outgoing condenser and outgoing optical fiber that said detection optical routing is on the same straight line constitute; Said sensor light source is the UVLED array; The sensor light source is coupled through collimating mirror to the measuring light chamber through incident condenser, incident optical transmission light; Light beam passes through the measuring light chamber again by solution absorption to be measured, is coupled in the outgoing optical fiber through the outgoing condenser, transmits;
Also be provided with identical with said measuring light chamber length and axial location same reference light chamber at the sensor body middle part, said reference light also is provided with sealed inserted piece on the chamber; On two side, reference light chamber, be provided with second collimating mirror and the second outgoing condenser on same straight line; Corresponding said reference light chamber also is provided with second and detects light path, and said second detects optical routing is in the second sensor light source UVLED array, the second incident condenser, second incident optical, second collimating mirror, the second outgoing condenser and second outgoing optical fiber formation on the same straight line; The second sensor light source UVLED array is coupled through second collimating mirror to the reference light chamber through the second incident condenser, second incident optical transmission light; After light beam is absorbed by standard solution through the reference light chamber; Be coupled in the second outgoing optical fiber through the second outgoing condenser, transmit;
Realize the twin-beam detection through the comparison between measuring light chamber and the reference light chamber at last, improve the precision of measurement result.
The effect of said UVLED array provides required ultraviolet spectrum as light source; The effect of collimating mirror is to converge transmission to the UVLED array to become the parallel light velocity, has guaranteed light beam better transmission in measuring light chamber or reference light chamber.
The effect of said sensor body is to realize the twin-beam detection through the comparison between measuring light chamber and the reference light chamber, improves the precision of measurement result, wherein passes through the probe transducing part recessing of measuring light chamber, has realized the online detection of water quality.
The effect of said incident optical and outgoing optical fiber is the continuous leaded light efficient of light beam in optical fiber that improves the ultraviolet region wavelength, overcomes general optical fiber to the inefficient shortcoming of ultraviolet light beam leaded light.
The effect of said sealed inserted piece is to make things convenient in the reference light chamber reference solution to change easily, to guarantee the quality of reference measure solution.
Compare prior art, the present invention has following beneficial effect:
1, integrated twin-beam water-quality COD detecting line sensor of the present invention has adopted the light source of led array as sensor, makes sensor construction simplify greatly; And, reduced the volume and weight of sensor greatly, compare simultaneously that other is similar with tungsten lamp, xenon lamp is as the probe of light source, and cost is low, and power consumption is few, and serviceable life, overlength, stability were better, did not need follow-up maintenance.This sensor construction is simple, uses this sensor to have higher performance, and easy to use.
2, led array light source of the present invention adopts a plurality of LED to form continuous wave band; Realization detects the continuous wavelength of water-quality COD; Make measurement result can in a big way, accurately reflect the value of water body COD; Reduce greatly small amounts of inorganic thing, trace element and metallic ion ultraviolet band absorbance interference that organic absorbance is produced, and improve measuring accuracy.
3, the present invention adopts measuring light chamber and reference light chamber in sensor body, realizes that through twin-beam comparison surveys, and further improves measuring accuracy, and sensor places water body, realizes that immersion monitors in real time.Make and measure convenientization.
Description of drawings
The synoptic diagram of Fig. 1 detecting line sensor of the present invention
Fig. 2 sensor body sectional structure chart of the present invention
Fig. 3 UVLED array light source of the present invention synoptic diagram.
Among the figure: 1-outgoing optical fiber, 2-outgoing condenser, 3-collimating mirror, 4-incident light, 5-incident condenser; The 6-UVLED array, the 7-light source drives, 8-drive cable, 9-sensor body, 10-measuring light chamber; 11-reference light chamber, 12-sealed inserted piece, 13-outgoing optical fiber through hole, 14-drive cable through hole.The 21-second outgoing optical fiber, the 22-second outgoing condenser, 23-second collimating mirror, 24-second incident light, the 25-second incident condenser, 26-the 2nd UVLED array.
Embodiment
Referring to Fig. 1, Fig. 2 and Fig. 3, integrated twin-beam water-quality COD detecting line sensor is characterized in that, comprises sensor body 9, measuring light chamber 10 and detects light path; The rectangular recess of said measuring light chamber 10 for offering at sensor body 9 middle parts, said measuring light chamber 10 are provided with the collimating mirror 3 and outgoing condenser 2 on same straight line along sensor body 9 axial two sides; Sensor light source, incident condenser 5, incident optical 4, collimating mirror 3, outgoing condenser 2 and outgoing optical fiber 1 that said detection optical routing is on the same straight line constitute; Said sensor light source is a UVLED array 6; The sensor light source is through 10 process collimating mirrors, 3 couplings to the measuring light chamber of incident condenser 5, incident optical 4 transmission light; Light beam passes through measuring light chamber 10 again by solution absorption to be measured, is coupled in the outgoing optical fiber 1 through outgoing condenser 2, transmits;
Also be provided with identical and axial location same reference light chamber 11 at sensor body 9 middle parts, also be provided with sealed inserted piece 12 on the said reference light chamber 11 with said measuring light chamber 10 length; On 11 two sides, reference light chamber, be provided with second collimating mirror 23 and the second outgoing condenser 22 on same straight line; Corresponding said reference light chamber 11 also is provided with second and detects light path, and said second detects optical routing is in the second sensor light source UVLED array 26 on the same straight line, the second incident condenser 25, second incident optical 24, second collimating mirror 23, the second outgoing condenser 22 and the second outgoing optical fiber 21 and constitutes; The second sensor light source UVLED array 26 is coupled through second collimating mirror 23 to reference light chamber 11 through the second incident condenser 25, second incident optical, 24 transmission light; After light beam is absorbed by standard solution through reference light chamber 11; Be coupled in the second outgoing optical fiber 21 through the second outgoing condenser 22, transmit;
At last, realize the twin-beam detection, improve the precision of measurement result through the comparison between measuring light chamber 10 and the reference light chamber 11.
The optional scope of optical path difference of said measuring light chamber 10 and reference light chamber 11 is: 0.5-30mm.
The effect of said UVLED array provides required ultraviolet spectrum as light source; The effect of said collimating mirror is to converge transmission to the UVLED array to become the parallel light velocity, has guaranteed light beam better transmission in measuring light chamber or reference light chamber.
The effect of said sensor body is to realize the twin-beam detection through the comparison between measuring light chamber and the reference light chamber, improves the precision of measurement result, wherein passes through the probe transducing part recessing of measuring light chamber, has realized the online detection of water quality.The effect of said incident optical and outgoing optical fiber is the continuous leaded light efficient of light beam in optical fiber that improves the ultraviolet region wavelength, overcomes general optical fiber to the inefficient shortcoming of ultraviolet light beam leaded light.The effect of said sealed inserted piece 12 is to make things convenient in the reference light chamber reference solution to change easily, to guarantee the quality of reference measure solution.
Wherein, Light source drives and transforms into the needed stable pressure drop of UVLED array to the voltage of 220v, drives the UVLED array light-emitting, and the UVLED array is coupled to incident optical to light source through condenser; The incident optical transmitting beam is coupled to wherein through collimating mirror to the measuring light chamber or during the reference light chamber; Light through measuring light chamber or reference light chamber by solution absorption in the pond after, be coupled in the outgoing optical fiber by condenser, transmit.
According to a preferred version of the present invention, the LED lamp that said UVLED array is chosen required spectrum becomes led array through being arranged in parallel, so that the light source of required ultraviolet light spectral coverage to be provided.This light source of LED has that volume is little, low in energy consumption, the life-span is long, working stability, makes sensor construction simplify greatly with led array as light source, and has reduced the volume and weight of light source greatly.
Said sensor body has adopted the comparison of measuring light chamber and reference light chamber to realize the twin-beam detection; Sensor is immersed in to measure in the solution goes; The immersion to water quality, online detection have been realized; Reference light chamber configuration standard solution, the comparison of adopting measuring light chamber and reference light chamber is to improve the precision of measurement result.
According to a preferred version of the present invention, the effect of said incident optical 4 and outgoing optical fiber 1 is the continuous leaded light efficient of light beam in optical fiber that improves the ultraviolet region wavelength, has overcome general optical fiber to the inefficient shortcoming of ultraviolet light beam leaded light.
The present invention is based on most organic reflection all to some extent on the absorption spectrum of ultraviolet band; But different organism are in the same wavelength of ultraviolet band; And the absorbance of identical organism at ultraviolet band different wave length place is different principles; The present invention adopts a plurality of led array light sources to form continuous wavelength, realizes the continuous wavelength of water-quality COD is detected.The employing twin-beam compares, and improves measuring accuracy.
Claims (4)
1. integrated twin-beam water-quality COD detecting line sensor is characterized in that, comprises sensor body (9), measuring light chamber (10) and detects light path; The rectangular recess of said measuring light chamber (10) for offering at sensor body (9) middle part, said measuring light chamber (10) is provided with collimating mirror (3) and the outgoing condenser (2) on same straight line along the axial two side of sensor body (9); Sensor light source, incident condenser (5), incident optical (4), collimating mirror (3), outgoing condenser (2) and outgoing optical fiber (1) that said detection optical routing is on the same straight line constitute; Said sensor light source is UVLED array (6); The sensor light source is coupled through collimating mirror (3) to measuring light chamber (10) through incident condenser (5), incident optical (4) transmission light; Light beam passes through measuring light chamber (10) again by solution absorption to be measured; Be coupled in the outgoing optical fiber (1) through outgoing condenser (2), transmit;
Also be provided with identical and axial location same reference light chamber (11) at sensor body (9) middle part, also be provided with sealed inserted piece (12) on the said reference light chamber (11) with said measuring light chamber (10) length; On two side, reference light chamber (11), be provided with second collimating mirror (23) and the second outgoing condenser (22) on same straight line; Corresponding said reference light chamber (11) also is provided with second and detects light path, and said second detects optical routing is in the second sensor light source UVLED array (26), the second incident condenser (25), second incident optical (24), second collimating mirror (23), the second outgoing condenser (22) and the second outgoing optical fiber (21) formation on the same straight line; The second sensor light source UVLED array (26) is coupled through second collimating mirror (23) to reference light chamber (11) through the second incident condenser (25), second incident optical (24) transmission light; After light beam is absorbed by standard solution through reference light chamber (11); Be coupled in the second outgoing optical fiber (21) through the second outgoing condenser (22), transmit;
Realize the twin-beam detection through the comparison between measuring light chamber (10) and reference light chamber (11) at last, improve the precision of measurement result.
2. integrated twin-beam water-quality COD detecting line sensor according to claim 1 is characterized in that said sensor light source UVLED array (6,26) is made up of the ultraviolet LED lamp of 4 ~ 6 symmetric offset spread, is driven by drive unit (7).
3. integrated twin-beam water-quality COD detecting line sensor according to claim 1 is characterized in that the optional scope of optical path difference of said measuring light chamber (10) and reference light chamber (11) is: 0.5-30mm.
4. integrated twin-beam water-quality COD detecting line sensor according to claim 1 is characterized in that said sensor body (9) is a list structure, and its section is circle or rectangle.
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| CN201210286185.8A CN102798602B (en) | 2012-08-13 | 2012-08-13 | Integrated dual-beam water quality COD on-line detection sensor |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149166A (en) * | 2013-01-31 | 2013-06-12 | 中国计量学院 | Dual-wavelength ultraviolet method organic wastewater chemical oxygen demand (COD) detection device and method |
| CN103776787A (en) * | 2014-02-25 | 2014-05-07 | 杭州纳宏光电科技有限公司 | Double-spectrum water quality analyzer |
| CN103837479A (en) * | 2014-03-27 | 2014-06-04 | 江西农业大学 | Portable automatic polarimeter with open solution bin and measurement method thereof |
| CN103969206A (en) * | 2014-04-23 | 2014-08-06 | 北京金达清创环境科技有限公司 | Multi-index water quality sensing probe based on ultraviolet visible absorption spectrum |
| CN105334171A (en) * | 2015-10-16 | 2016-02-17 | 北京农业智能装备技术研究中心 | Water body COD on-line monitoring system, and method used for monitoring water body COD using water body COD on-line monitoring system |
| CN106153563A (en) * | 2015-03-16 | 2016-11-23 | 北京中清国研环境技术研究院 | A kind of miniature COD on-line detecting system |
| CN107367476A (en) * | 2016-05-13 | 2017-11-21 | 通用电气公司 | Assess method and system and its application in water process of the biodegradability of water |
| CN111065913A (en) * | 2017-09-19 | 2020-04-24 | 横河电机株式会社 | Inspection method and inspection system |
| CN112240872A (en) * | 2020-10-15 | 2021-01-19 | 乐山师范学院 | Integrated multi-index water quality on-line monitor and monitoring method thereof |
| CN112304888A (en) * | 2019-07-31 | 2021-02-02 | Tcl集团股份有限公司 | Water quality detection method, system and storage medium |
| CN113340887A (en) * | 2021-06-29 | 2021-09-03 | 军事科学院军事医学研究院环境医学与作业医学研究所 | High-flux array type water quality sensor |
| CN113466139A (en) * | 2021-06-23 | 2021-10-01 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Equal-arm contrast type water body optical attenuation coefficient measuring device and method |
| CN114047239A (en) * | 2021-11-01 | 2022-02-15 | 武汉天逸创瑞科学仪器有限公司 | Water quality online analyzer with front pretreatment device |
| US11913876B2 (en) | 2021-11-17 | 2024-02-27 | Industrial Technology Research Institute | Optical water-quality detection apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103149166A (en) * | 2013-01-31 | 2013-06-12 | 中国计量学院 | Dual-wavelength ultraviolet method organic wastewater chemical oxygen demand (COD) detection device and method |
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| CN103969206A (en) * | 2014-04-23 | 2014-08-06 | 北京金达清创环境科技有限公司 | Multi-index water quality sensing probe based on ultraviolet visible absorption spectrum |
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| CN105334171A (en) * | 2015-10-16 | 2016-02-17 | 北京农业智能装备技术研究中心 | Water body COD on-line monitoring system, and method used for monitoring water body COD using water body COD on-line monitoring system |
| CN107367476A (en) * | 2016-05-13 | 2017-11-21 | 通用电气公司 | Assess method and system and its application in water process of the biodegradability of water |
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| CN112304888A (en) * | 2019-07-31 | 2021-02-02 | Tcl集团股份有限公司 | Water quality detection method, system and storage medium |
| CN112240872A (en) * | 2020-10-15 | 2021-01-19 | 乐山师范学院 | Integrated multi-index water quality on-line monitor and monitoring method thereof |
| CN113466139A (en) * | 2021-06-23 | 2021-10-01 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Equal-arm contrast type water body optical attenuation coefficient measuring device and method |
| CN113466139B (en) * | 2021-06-23 | 2022-07-19 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Equal-arm contrast type water body optical attenuation coefficient measuring device and method |
| CN113340887A (en) * | 2021-06-29 | 2021-09-03 | 军事科学院军事医学研究院环境医学与作业医学研究所 | High-flux array type water quality sensor |
| CN114047239A (en) * | 2021-11-01 | 2022-02-15 | 武汉天逸创瑞科学仪器有限公司 | Water quality online analyzer with front pretreatment device |
| CN114047239B (en) * | 2021-11-01 | 2024-01-05 | 北京江博环境科技有限公司 | Water quality on-line analyzer with front pretreatment device |
| US11913876B2 (en) | 2021-11-17 | 2024-02-27 | Industrial Technology Research Institute | Optical water-quality detection apparatus |
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