CN102788757A - Water quality chromaticity detection device on basis of transmission-type optical fiber sensor - Google Patents
Water quality chromaticity detection device on basis of transmission-type optical fiber sensor Download PDFInfo
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- CN102788757A CN102788757A CN201210310133XA CN201210310133A CN102788757A CN 102788757 A CN102788757 A CN 102788757A CN 201210310133X A CN201210310133X A CN 201210310133XA CN 201210310133 A CN201210310133 A CN 201210310133A CN 102788757 A CN102788757 A CN 102788757A
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Abstract
The invention discloses a water quality chromaticity detection device on the basis of a transmission-type optical fiber sensor, which comprises three LED (Light-Emitting Diode) single-color light sources, the transmission-type optical fiber sensor, a USB (Universal Serial Bus) optical fiber spectrometer and a computer. The LED single-color light sources are connected with the transmission-type optical fiber sensor by optical fibers; the transmission-type optical fiber sensor is connected with the USB optical fiber spectrometer by an optical fiber; and the USB optical fiber spectrometer is connected with the computer by a USB data transmission line. The device adopts a three wavelength spectrophotometry to calculate to obtain the random water sample chromaticity, is suitable for the chromaticity detection of aqueous solution such as industrial sewage, surface water, drinking water and the like and has the advantages of simple structure, convenience in operation, reaction sensitivity, small volume, low cost and the like.
Description
Technical field
The present invention relates to a kind of water quality colorimetric detection device, relate in particular to a kind of water quality colorimetric detection device based on the transmission-type Fibre Optical Sensor.
Background technology
Colourity is the physical quantity of expression color intensity, is one of important indicator that characterizes the water quality quality, and the national standard method of existing water quality colorimetric detection (GB/T 11903-1989) is platinum cobalt colourimetry and extension rate method.Platinum cobalt colourimetry is to utilize color standard solution and sample by potassium chloroplatinate and cobalt chloride preparation to carry out visual comparison to measure the colourity of water sample; Be applicable to clean water, slight pollution also has a little the water of yellow hue and the day water, underground water and the potable water etc. of cleaning.The extension rate method is that sample is diluted to visual comparison and the optical voidness water extension rate when just cannot see color as the intensity of expressing color with the optics pure water, is applicable to the day water and industrial waste water that pollution is more serious.Yet, loaded down with trivial details, the consuming time length of this two kinds of determination of colority methods operating process, and the influence of visual comparison procedure subject's sense of vision factor is bigger, and then make the colourity result of mensuration have uncertainty.In addition, the noble metal chemical reagent of using in the platinum cobalt colourimetry costs an arm and a leg, and also environment has been caused secondary pollution in the waste raw-material while of experiment.
In order to overcome the drawback of visual colorimetric determination method, people have proposed use spectrophotometer measurement water quality colourity, and this has been carried out research.Spectrophotometer measurement water quality colourity is based on spectrophotometric principles; Use spectrophotometer to replace human eye to measure water quality colourity; Broken away from the influence of human eye subjective factor to measuring process, measurement result is objective, true, repeatable high, and Measurement Resolution also is greatly improved.But, use spectrophotometer measurement water quality colourity to only limit to laboratory measurement, need gather and pre-service water sample, testing process is complicated, the cycle is long, have secondary pollution, and cost is high.
The method about spectrophotometer measurement colourity of present pertinent literature report; Basically all be to set up absorbance and the match relational expression of colourity under the color standard solution specific wavelength, confirm its chromatic value through the absorbance substitution match relational expression of measuring water sample then through experiment.This is actually with such prerequisite that is assumed to be, and promptly the color colour system of waste water is constant basically and just the depth is variant, thereby basic identical for its absorption characteristic of water sample of same colour system.Yet the pollutant component of actual waste water is complicated, and different materials has the differing absorption characteristic; When pollutant component changes slightly; Absorbing wavelength also can change, thereby in a certain certain wave strong point, the method for setting up absorbance and colourity relation can't realize the universality measurement of sewage colourity.
Summary of the invention
Deficiency to above-mentioned prior art existence; The object of the present invention is to provide a kind of water quality colorimetric detection device based on the transmission-type Fibre Optical Sensor; This device utilizes the three-wavelength measuring method to measure the colourity of water sample to be measured, is applicable to the measurement real-time of WS colourities such as industrial sewage, surface water and potable water.
The technical scheme that the present invention taked is: a kind of water quality colorimetric detection device based on the transmission-type Fibre Optical Sensor; Comprise three LED monochromatic sources; The transmission-type Fibre Optical Sensor, USB fiber spectrometer and computing machine, the LED monochromatic source is connected with the transmission-type Fibre Optical Sensor through optical fiber; The transmission-type Fibre Optical Sensor is connected with the USB fiber spectrometer through optical fiber, and the USB fiber spectrometer is connected with computing machine through the usb data transmission line.
Described three LED monochromatic sources glow respectively, green glow and blue light.
Described transmission-type Fibre Optical Sensor comprises incident optical, shell, outgoing optical fiber, filter membrane, tubular filter membrane stationary installation and suspension ring; Filter membrane is positioned at vertical two ends of transmission-type Fibre Optical Sensor, fixes through tubular filter membrane stationary installation, and the filter membrane aperture is 0.45 μ m; Incident optical and outgoing optical fiber are positioned at the transverse ends of transmission-type Fibre Optical Sensor, are connected with shell and fixing collimation through fiber coupler.
A kind of water quality colorimetric detection device based on the transmission-type Fibre Optical Sensor, the colorimetric detection computing method that it adopts are:
The first step: by national standard; Standard No. is that the platinum cobalt colourimetry of GB/T 11903-1989 is prepared the known color standard solution of serial chromatic value; Adopt described a kind of transmitted spectrum based on the known color standard solution of each chromatic value of water quality colorimetric detection measurement device of transmission-type Fibre Optical Sensor; And the transmitted spectrum of getting the known color standard solution of each chromatic value is in 595nm, 555nm, the transmitance T at 445nm place
1, T
2, T
3, according to formula:
X＝(0.7833×T
1)+(0.1974×T
3)
Y＝T
2
Z＝1.1822×T
3
Calculate tristimulus values X, Y, the Z of the known color standard solution of each chromatic value, calculate the aberration Δ E of the known color standard solution of each chromatic value by tristimulus values again, utilize the Return Law to set up the relational expression C=f of colourity and aberration (Δ E) with respect to the optics pure water;
Second step: for water sample to be measured, adopt described a kind of its transmitted spectrum of water quality colorimetric detection measurement device, and the transmitted spectrum of getting water sample to be measured is in 595nm, 555nm, the transmitance T at 445nm place based on the transmission-type Fibre Optical Sensor
1, T
2, T
3, according to formula:
X＝(0.7833×T
1)+(0.1974×T
3)
Y＝T
2
Z＝1.1822×T
3
Calculate tristimulus values X, Y, the Z of water sample to be measured, again by tristimulus values calculate water sample to be measured with respect to the optics pure water aberration Δ E, the regression relation that its substitution first step is set up calculates the chrominance C of water sample to be measured.
The invention has the beneficial effects as follows:
1.LED monochromatic source is swift in response, volume is little, cost is low, is more conducive to the system integration;
2. whole device volume is little, easy to carry, can realize quick in-site measurement;
3. whole device utilizes Fibre Optical Sensor measuring water quality colourity, strong interference immunity, can long-distance transmissions, can realize real time on-line monitoring.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is a kind of structural representation of the water quality colorimetric detection device based on the transmission-type Fibre Optical Sensor.
Fig. 2 is a transmission-type optical fibre sensor structure synoptic diagram.
Among Fig. 1: the 1st, the LED monochromatic source, its emission wavelength is a ruddiness; The 2nd, the LED monochromatic source, its emission wavelength is a green glow; The 3rd, the LED monochromatic source, its emission wavelength is a blue light; The 4th, fiber coupler; The 5th, pass light optical fiber; The 6th, incident optical; The 7th, the transmission-type Fibre Optical Sensor; The 8th, outgoing optical fiber; The 9th, fiber coupler; The 10th, the USB fiber spectrometer; The 11st, the usb data transmission line; The 12nd, computing machine.
Among Fig. 2: the 6th, incident optical; The 8th, outgoing optical fiber; The 13rd, transmission-type Fibre Optical Sensor shell; The 14th, tubular filter membrane stationary installation; The 15th, fiber coupler; The 16th, suspension ring; The 17th, filter membrane; The 18th, fiber coupler.
Embodiment
Among Fig. 1, a kind of water quality colorimetric detection device based on the transmission-type Fibre Optical Sensor comprises three LED monochromatic sources 1,2,3, transmission-type Fibre Optical Sensor 7, USB fiber spectrometer 10 and computing machine 12.LED monochromatic source 1,2,3 is connected with transmission-type Fibre Optical Sensor 7 through biography light optical fiber 5, incident optical 6; Transmission-type Fibre Optical Sensor 7 is connected with USB fiber spectrometer 10 through outgoing optical fiber 8, and USB fiber spectrometer 10 is connected with computing machine 12 through usb data transmission line 11.
Among Fig. 2, transmission-type Fibre Optical Sensor 7, by incident optical 6, shell 13, fiber coupler 15, tubular filter membrane stationary installation 14, suspension ring 16, filter membrane 17, fiber coupler 18, outgoing optical fiber 8 is formed.Shell 13 is four-way structures, and horizontal and vertical two ends all are external thread structure; Tubular filter membrane stationary installation 14 has female thread structure, matches with vertical two ends external thread.Incident optical 6 is connected and collimation with shell 13 with fiber coupler 18 through fiber coupler 15 respectively with outgoing optical fiber 8, and filter membrane 17 is fixed on shell 13 vertical two ends through tubular filter membrane stationary installation 14.
A kind of water quality colorimetric detection device based on the transmission-type Fibre Optical Sensor, the principle of its colorimetric detection mainly adopt three-wavelength to measure computing method:
The first step: by national standard; Standard No. is that the platinum cobalt colourimetry of GB/T 11903-1989 is prepared the known color standard solution of serial chromatic value; Adopt described a kind of transmitted spectrum based on the known color standard solution of each chromatic value of water quality colorimetric detection measurement device of transmission-type Fibre Optical Sensor; And the transmitted spectrum of getting the known color standard solution of each chromatic value is in 595nm, 555nm, the transmitance T at 445nm place
1, T
2, T
3, according to formula:
X＝(0.7833×T
1)+(0.1974×T
3)
Y＝T
2
Z＝1.1822×T
3
Calculate tristimulus values X, Y, the Z of the known color standard solution of each chromatic value, calculate the aberration Δ E of the known color standard solution of each chromatic value by tristimulus values again, utilize the Return Law to set up the relational expression C=f of colourity and aberration (Δ E) with respect to the optics pure water;
Second step: for water sample to be measured, adopt described a kind of its transmitted spectrum of water quality colorimetric detection measurement device, and the transmitted spectrum of getting water sample to be measured is in 595nm, 555nm, the transmitance T at 445nm place based on the transmission-type Fibre Optical Sensor
1, T
2, T
3, according to formula:
X＝(0.7833×T
1)+(0.1974×T
3)
Y＝T
2
Z＝1.1822×T
3
Calculate tristimulus values X, Y, the Z of water sample to be measured, again by tristimulus values calculate water sample to be measured with respect to the optics pure water aberration Δ E, the regression relation that its substitution first step is set up calculates the chrominance C of water sample to be measured.
The course of work that the present invention implements colorimetric detection is following:
Transmission-type Fibre Optical Sensor 7 usefulness steel wires or rope are connected suspension ring 16 put into water sample to be measured and submergence fully,, get into interior water base of transmission-type Fibre Optical Sensor 7 and do not comprise large granular impurity because transmission-type Fibre Optical Sensor 7 vertical two ends are fixed with filter membrane 17.The red, green, blue that LED monochromatic source 1,2,3 is sent gets into through fiber coupler 4 and passes light optical fiber 5, incident optical 6; Be coupled into transmission-type Fibre Optical Sensor 7 through fiber coupler 15; Light gets into outgoing optical fiber 8 through fiber coupler 18 after being absorbed by the water selectivity in the transmission-type Fibre Optical Sensor 7, transfers to fiber coupler 9 and gets into USB fiber spectrometer 10; USB fiber spectrometer 10 is through beam split and opto-electronic conversion; Image data is sent to computing machine 12 through usb data transmission line 11, and computing machine 12 is measured computing method through three-wavelength, calculates the chromatic value that obtains water sample to be measured.
Claims (3)
1. water quality colorimetric detection device based on the transmission-type Fibre Optical Sensor; Comprise three LED monochromatic sources; The transmission-type Fibre Optical Sensor, USB fiber spectrometer and computing machine, the LED monochromatic source is connected with the transmission-type Fibre Optical Sensor through optical fiber; The transmission-type Fibre Optical Sensor is connected with the USB fiber spectrometer through optical fiber, and the USB fiber spectrometer is connected with computing machine through the usb data transmission line.
2. a kind of water quality colorimetric detection device based on the transmission-type Fibre Optical Sensor according to claim 1 is characterized in that: said three LED monochromatic sources glow respectively, green glow and blue light.
3. a kind of water quality colorimetric detection device according to claim 1 based on the transmission-type Fibre Optical Sensor, it is characterized in that: described transmission-type Fibre Optical Sensor comprises incident optical, shell, outgoing optical fiber, filter membrane, tubular filter membrane stationary installation and suspension ring; Filter membrane is positioned at vertical two ends of transmission-type Fibre Optical Sensor, is fixed by tubular filter membrane stationary installation, and the filter membrane aperture is 0.45 μ m; Incident optical and outgoing optical fiber are positioned at the transverse ends of transmission-type Fibre Optical Sensor, are connected with shell and fixing collimation through fiber coupler.
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Cited By (7)
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| CN103175793A (en) * | 2013-04-01 | 2013-06-26 | 中国计量学院 | Chemical sensor for remote multi-point detection based on long-period fiber grating |
| CN103592234A (en) * | 2013-11-18 | 2014-02-19 | 苏州科技学院 | Method for evaluating apparent quality of landscape water body |
| CN104122213A (en) * | 2014-06-30 | 2014-10-29 | 苏州科技学院 | Method for measuring chromaticity of water quality |
| CN106442415A (en) * | 2016-12-16 | 2017-02-22 | 哈尔滨工业大学 | Household drinking water quality online detection device |
| CN107976409A (en) * | 2017-11-23 | 2018-05-01 | 上海海恒机电仪表有限公司 | A kind of new online chromascope and its detection method |
| CN110687050A (en) * | 2019-09-29 | 2020-01-14 | 长沙有色冶金设计研究院有限公司 | Water quality monitoring system and monitoring method based on image recognition |
| CN115326726A (en) * | 2022-08-12 | 2022-11-11 | 粤海永顺泰(广州)麦芽有限公司 | Malt chroma detection method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN106442415A (en) * | 2016-12-16 | 2017-02-22 | 哈尔滨工业大学 | Household drinking water quality online detection device |
| CN107976409A (en) * | 2017-11-23 | 2018-05-01 | 上海海恒机电仪表有限公司 | A kind of new online chromascope and its detection method |
| CN110687050A (en) * | 2019-09-29 | 2020-01-14 | 长沙有色冶金设计研究院有限公司 | Water quality monitoring system and monitoring method based on image recognition |
| CN110687050B (en) * | 2019-09-29 | 2022-09-09 | 长沙有色冶金设计研究院有限公司 | Water quality monitoring system and monitoring method based on image recognition |
| CN115326726A (en) * | 2022-08-12 | 2022-11-11 | 粤海永顺泰(广州)麦芽有限公司 | Malt chroma detection method |
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Application publication date: 20121121 |