CN107340261B - Water quality on-line detection system - Google Patents
Water quality on-line detection system Download PDFInfo
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- CN107340261B CN107340261B CN201710195796.4A CN201710195796A CN107340261B CN 107340261 B CN107340261 B CN 107340261B CN 201710195796 A CN201710195796 A CN 201710195796A CN 107340261 B CN107340261 B CN 107340261B
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- 238000001514 detection method Methods 0.000 title claims abstract description 221
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 239000005416 organic matter Substances 0.000 claims abstract description 48
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 239000008213 purified water Substances 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000002835 absorbance Methods 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005064 physico chemical analysis method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
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Abstract
The invention relates to a water quality online detection system, which comprises a water quality online detection unit, a controller unit and a display unit, and is characterized in that: the water quality on-line detection unit at least comprises an organic matter detection sensor, wherein the organic matter detection sensor comprises a light source capable of emitting ultraviolet rays and a detection component which is matched with the light source and is capable of detecting the content of organic matters in water, the light source is a detection group LED ultraviolet lamp, the detection group LED ultraviolet lamp is connected with a current control circuit, and the current flowing through the detection group LED ultraviolet lamp is controlled by the current control circuit; the detection assembly comprises a detection tube, a detection group ultraviolet receiver, a detection group signal amplifying circuit and a signal processing circuit. Compared with the prior art, the invention has the advantages that: the organic matter content in the water can be detected and displayed in real time, and the organic matter detection sensor has low cost and small volume, and is suitable for various detection occasions.
Description
Technical Field
The invention relates to a water quality on-line detection system.
Background
Water is one of the important resources for human life and survival, and water pollution and water quality degradation caused by social and economic development at present become one of the most important environmental problems. In recent years, water pollution has occurred in the event of occurrence. In order to prevent the occurrence of sudden pollution events, an advanced water quality analysis technology is necessary to realize the detection of water quality, and meanwhile, the water quality detection result can be displayed in real time, and when the water quality is polluted, early warning and forecasting can be performed in time. The water quality early warning system commonly used at home and abroad at present mainly is a water quality early warning system based on a conventional physicochemical analysis method, can directly analyze and measure toxic and harmful substances or concentrations in a water environment, but often has hysteresis and needs a certain time.
At present, the detection of the content of the organic matters mainly depends on a spectrophotometer, and the working principle is as follows: the total content of the organic matters is indirectly represented by the absorbance of the ultraviolet rays with the wavelength of 254 nanometers, after the ultraviolet rays with the wavelength of 254 nanometers penetrate through water, the organic matters in the water absorb part of the ultraviolet rays, and the higher the concentration of the organic matters is, the higher the intensity of the ultraviolet ray absorption is, so the absorbance of the ultraviolet rays corresponds to the content of the organic matters. Different organic matters have different absorption intensities for ultraviolet rays with different wavelengths, and the content of different organic matters in the water can be approximately analyzed by scanning the absorption intensities of the ultraviolet rays with different wavelengths. And the measurement of the total content, namely the comprehensive index of the content of different organic matters, is mainly embodied on ultraviolet rays with 254 nm wavelength.
However, the spectrophotometer itself is an instrument, which is very expensive and very bulky, and above all has a certain obstacle to the use of ordinary people.
Disclosure of Invention
The invention aims to solve the technical problem of providing a water quality on-line detection system which is low in cost and at least capable of displaying the content of organic matters in water in real time.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a water quality on-line measuring system, includes water quality on-line measuring unit, the controller unit who is connected with water quality on-line measuring unit, and the display element who is connected with the controller unit, its characterized in that: the water quality on-line detection unit at least comprises an organic matter detection sensor for detecting the organic matter content of water quality, wherein the organic matter detection sensor comprises a light source capable of emitting ultraviolet rays and a detection component which is matched with the light source and can detect the organic matter content in water, the light source is a detection group LED ultraviolet lamp, the detection group LED ultraviolet lamp is connected with a current control circuit, and the current flowing through the detection group LED ultraviolet lamp is controlled by the current control circuit; the detection assembly comprises
The detection tube can be penetrated by ultraviolet rays emitted by the LED ultraviolet lamp of the detection group, and water can pass through the detection tube;
the detection group ultraviolet receiver is used for detecting the intensity of ultraviolet rays emitted from the detection group LED ultraviolet lamp and penetrating through the detection tube;
the output end of the detection group ultraviolet receiver is connected with the input end of the detection group signal amplifying circuit and is used for amplifying the ultraviolet intensity signal detected by the detection group ultraviolet receiver;
the output end of the detection group signal amplifying circuit is connected with the signal processing circuit, the signal processing circuit is also connected with the current control circuit, and the signal processing circuit calculates the content of organic matters in water passing through the detection tube according to the ultraviolet intensity signal amplified by the detection group signal amplifying circuit.
The organic matter detection sensor provided by the invention not only can effectively detect the content of organic matters in water, but also has few components and simple structure, so that the detection component with smaller volume and lower cost can be manufactured.
As an improvement, the organic matter detection sensor provided by the invention further comprises a shell, wherein a detection tube accommodating cavity is formed in the shell, and the detection tube is arranged in the detection tube accommodating cavity; the current control circuit and the detection group LED ultraviolet lamp are arranged on one side of the shell, and the detection group ultraviolet receiver, the detection group signal amplifying circuit and the signal processing circuit are arranged on the other opposite side of the shell; the shell is internally provided with a first light-transmitting channel and a second light-transmitting channel which are communicated with the accommodating cavity of the detection tube and are positioned at two opposite sides of the accommodating cavity of the detection tube, and ultraviolet light emitted by the LED ultraviolet lamp of the detection group reaches the ultraviolet receiver of the detection group after passing through the first light-transmitting channel, the detection tube and the second light-transmitting channel.
Still further, the organic matter detection sensor further comprises a comparison component, and the comparison component comprises:
the control group LED ultraviolet lamp is connected with the detection group LED ultraviolet lamp in series and then connected with the current control circuit, and the current control circuit controls the current flowing through the detection group LED ultraviolet lamp and the control group LED ultraviolet lamp;
a control tube which can be penetrated by ultraviolet rays emitted by the LED ultraviolet lamp of the control group, wherein the control tube is internally vacuumized or provided with air or purified water;
a control group ultraviolet receiver for detecting the intensity of ultraviolet rays emitted from the control group LED ultraviolet lamp and penetrating the control tube;
the control group signal amplifying circuit is connected with the output end of the control group ultraviolet receiver and the input end of the control group signal amplifying circuit and is used for amplifying the ultraviolet intensity signal detected by the control group ultraviolet receiver;
the output end of the comparison group signal amplifying circuit is also connected with the signal processing circuit, and the signal processing circuit calculates the content of organic matters in water passing through the detection tube according to the ultraviolet intensity signal amplified by the detection group signal amplifying circuit and the ultraviolet intensity signal amplified by the comparison group signal amplifying circuit.
The organic matter detection sensor further comprises a shell, wherein a detection tube accommodating cavity and a contrast tube accommodating cavity are formed in the shell, and the detection tube is arranged in the detection tube accommodating cavity; the control tube is arranged in the control tube accommodating cavity; the current control circuit, the detection group LED ultraviolet lamp and the comparison group LED ultraviolet lamp are arranged on one side of the shell, and the detection group ultraviolet receiver, the detection group signal amplifying circuit, the comparison group ultraviolet receiver, the comparison group signal amplifying circuit and the signal processing circuit are arranged on the other opposite side of the shell; the shell is internally provided with a first light transmission channel and a second light transmission channel which are communicated with the accommodating cavity of the detection tube and positioned at two opposite sides of the accommodating cavity of the detection tube, and ultraviolet light emitted by the LED ultraviolet lamp of the detection group passes through the first light transmission channel, the detection tube and the second light transmission channel and then reaches the ultraviolet receiver of the detection group; the shell is internally provided with a third light-transmitting channel and a fourth light-transmitting channel which are communicated with the control tube accommodating cavity and are positioned at two opposite sides of the control tube accommodating cavity, and ultraviolet light emitted by the LED ultraviolet lamp of the control group reaches the ultraviolet receiver of the control group after passing through the third light-transmitting channel, the control tube and the fourth light-transmitting channel.
The invention also comprises an alarm unit connected with the controller unit.
The invention also comprises a water quality purifying unit arranged on the pipeline behind the water quality on-line detecting unit.
The water quality on-line detection unit also comprises a turbidity sensor and a conductivity sensor.
Compared with the prior art, the invention has the advantages that: the water quality on-line detection system provided by the invention can detect and display the content of organic matters in water in real time by arranging the organic matter detection sensor in the water quality on-line detection unit, and the organic matter detection sensor provided by the invention has low cost and small volume, and is suitable for various detection occasions.
Drawings
FIG. 1 is a block diagram showing the connection of modules of an online water quality detection system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a first embodiment of an organic matter detection sensor according to an embodiment of the present invention.
Fig. 3 is a schematic perspective view of a first embodiment of an organic matter detection sensor according to an embodiment of the present invention.
Fig. 4 is a perspective sectional view of a first embodiment of an organic matter detection sensor according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a second embodiment of an organic matter detection sensor according to an embodiment of the present invention.
Fig. 6 is a schematic perspective view of a second embodiment of an organic matter detection sensor according to the present invention.
Fig. 7 is a perspective sectional view of a second embodiment of the organic matter detection sensor according to the present invention.
Fig. 8 is a perspective cross-sectional view of another view of a second embodiment of an organic matter detection sensor according to an embodiment of the present invention.
Fig. 9 is a perspective cross-sectional view of a second embodiment of an organic matter detection sensor according to an embodiment of the present invention.
Description of the embodiments
The invention is described in further detail below with reference to the embodiments of the drawings.
The water quality online detection system shown in fig. 1 comprises a water quality online detection unit 101, a controller unit 105 connected with the water quality online detection unit 101, a display unit 102 connected with the controller unit 105, an alarm unit 103 connected with the controller unit 105, and a water quality purification unit 104 arranged on a pipeline behind the water quality online detection unit 101.
Wherein the water quality on-line detecting unit 101 comprises an organic matter detecting sensor, a turbidity sensor and a conductivity sensor for detecting the organic matter content of water quality.
The organic matter detecting sensor has various structures, and various schemes of the organic matter detecting sensor structure will be described in detail below:
first scheme of organic matter detection sensor:
referring to fig. 2 to 4, the device comprises a light source capable of emitting ultraviolet rays and a detection component matched with the light source and capable of detecting the organic matter content in water; the light source is a detection group LED ultraviolet lamp 1, the detection group LED ultraviolet lamp 1 is connected with a current control circuit 5, and the current control circuit 5 controls the current flowing through the detection group LED ultraviolet lamp; the detection assembly comprises
A detection tube 2 which can be penetrated by ultraviolet rays emitted from the detection group LED ultraviolet lamp 1, and water can pass through the detection tube 2;
a detection group ultraviolet receiver 3 for detecting the intensity of ultraviolet rays emitted from the detection group LED ultraviolet lamp 1 and penetrating the detection tube 2;
the output end of the detection group signal amplifying circuit 4 is connected with the input end of the detection group signal amplifying circuit 4 and is used for amplifying the ultraviolet intensity signal detected by the detection group ultraviolet receiver 3;
the output end of the detection group signal amplifying circuit 4 is connected with the signal processing circuit 6, the signal processing circuit 6 is also connected with the current control circuit 5, and the signal processing circuit 6 calculates the content of organic matters in water passing through the detection tube 2 according to the ultraviolet intensity signal amplified by the detection group signal amplifying circuit 4.
In this embodiment, the organic matter detection sensor further includes a housing 11, a detection tube accommodating cavity is provided in the housing 11, and the detection tube 2 is disposed in the detection tube accommodating cavity; the current control circuit 5 and the detection group LED ultraviolet lamp 1 are arranged on the same circuit board A and are positioned on one side of the shell 11, and the detection group ultraviolet receiver 3, the detection group signal amplifying circuit 4 and the signal processing circuit 6 are arranged on the other circuit board B and are positioned on the other opposite side of the shell 11; the shell 11 is internally provided with a first light-transmitting channel 11a and a second light-transmitting channel 11b which are communicated with the accommodating cavity of the detection tube and are positioned at two opposite sides of the accommodating cavity of the detection tube, and ultraviolet light emitted by the LED ultraviolet lamp 1 of the detection group reaches the ultraviolet receiver 3 of the detection group after passing through the first light-transmitting channel, the detection tube 2 and the second light-transmitting channel.
The water inlet joint 12 and the water outlet joint 13 which are respectively communicated with the two ends of the detection pipe are connected, and sealing rings 14 are arranged at the positions of the water inlet joint and the water outlet joint, which are connected with the two ends of the detection pipe.
The detection method of the organic matter detection sensor comprises the following steps:
step (1), vacuumizing a detection tube 2, or keeping the detection tube 2 full of air, or flushing purified water into the detection tube 2, then starting the detection group LED ultraviolet lamp 1, and outputting a control signal to a current control circuit 5 through a signal processing circuit 6 to enable the current flowing through the detection group LED ultraviolet lamp 1 to change linearly; then the signal processing circuit 6 records the ultraviolet intensity signals amplified by the detection group signal amplifying circuit 4 under different current conditions respectively, averages the ultraviolet intensity values, and then marks the average value as a first ultraviolet intensity reference value;
step (2), preparing N pieces of control water samples with known organic matter content and different content, keeping the detection group LED ultraviolet lamp 1 on, respectively sequentially passing the N pieces of control water samples through the detection tube 2, and outputting a control signal to the current control circuit 5 through the signal processing circuit 6 according to the same mode of the step (1), so that the current flowing through the detection group LED ultraviolet lamp 1 shows linear change; then the signal processing circuit 6 records the ultraviolet intensity signals amplified by the detection group signal amplifying circuit 4 when N comparison water samples under different current conditions flow through the detection tube 2, averages the ultraviolet intensity values under the different current conditions, and marks the average value of the ultraviolet intensity values as a second ultraviolet intensity reference value, a third ultraviolet intensity reference value and a … … (n+1) th ultraviolet intensity reference value, wherein N is a natural number greater than or equal to 3;
step (3), according to the n+1 parts of ultraviolet intensity reference values obtained in the step (1) and the step (2), a comparison table between the organic matter content in a comparison water sample and the ultraviolet intensity values amplified by the detection group signal amplifying circuit 4 under different current conditions is obtained;
step (4), keeping the detection group LED ultraviolet lamp 1 on, enabling water to be detected to flow through the detection tube 2, and outputting a control signal to the current control circuit 5 through the signal processing circuit 6 in the same manner as in the step (1), so that the current flowing through the detection group LED ultraviolet lamp 1 shows linear change; then the signal processing circuit 6 records the ultraviolet intensity signals amplified by the detection group signal amplifying circuit 4 under different current conditions, averages the ultraviolet intensity values, marks the average value as an ultraviolet intensity detection value, and then obtains the organic matter content in the water to be detected at the moment by inquiring the comparison table obtained in the step (3).
Second scheme of organic matter detection sensor:
referring to fig. 5 to 9, compared with the first solution, the organic matter detection sensor further includes a comparison component, where the comparison component includes:
the control group LED ultraviolet lamp 10 is connected with the current control circuit 5 after being connected in series with the detection group LED ultraviolet lamp 1, and the current control circuit 5 controls the current flowing through the detection group LED ultraviolet lamp and the control group LED ultraviolet lamp 10;
a control tube 7 which can be penetrated by the ultraviolet rays emitted by the LED ultraviolet lamp 10 of the control group, wherein the inside of the control tube 7 is vacuumized or provided with air or purified water;
a control group ultraviolet receiver 8 for detecting the intensity of ultraviolet rays emitted from the control group LED ultraviolet lamp 10 and penetrating the control tube 7;
a reference group signal amplifying circuit 9, wherein the output end of the reference group ultraviolet receiver 8 is connected with the input end of the reference group signal amplifying circuit 9, and is used for amplifying the ultraviolet intensity signal detected by the reference group ultraviolet receiver 8;
the output end of the comparison group signal amplifying circuit 9 is also connected with the signal processing circuit 6, and the signal processing circuit 6 calculates the content of organic matters in the water passing through the detection tube 2 according to the ultraviolet intensity signal amplified by the detection group signal amplifying circuit 4 and the ultraviolet intensity signal amplified by the comparison group signal amplifying circuit 8.
A contrast tube accommodating cavity is also arranged in the shell 11, and a contrast tube 7 is arranged in the contrast tube accommodating cavity; the current control circuit 5, the detection group LED ultraviolet lamp 1 and the comparison group LED ultraviolet lamp 10 are arranged on the same circuit board and on one side of the shell 11, and the detection group ultraviolet receiver 3, the detection group signal amplifying circuit 4, the comparison group ultraviolet receiver 8, the comparison group signal amplifying circuit 9 and the signal processing circuit 6 are arranged on the other circuit board and on the other opposite side of the shell 11; the shell 11 is also internally provided with a third light-transmitting channel 11c and a fourth light-transmitting channel 11d which are communicated with the accommodating cavity of the comparison tube and positioned on two opposite sides of the accommodating cavity of the comparison tube, and ultraviolet light emitted by the LED ultraviolet lamp 10 of the comparison group reaches the ultraviolet receiver 8 of the comparison group after passing through the third light-transmitting channel 11c, the comparison tube 7 and the fourth light-transmitting channel 11 d.
The detection method of the organic matter detection sensor in the scheme comprises the following steps:
step (1), turning on the detection group LED ultraviolet lamp 1 and the comparison group LED ultraviolet lamp 10, and outputting a control signal to the current control circuit 5 through the signal processing circuit 6 so that the current flowing through the comparison group LED ultraviolet lamp 10 shows linear change; then the signal processing circuit 6 records the ultraviolet intensity signals amplified by the comparison group signal amplifying circuit 9 under different current conditions respectively, averages the ultraviolet intensity values and then marks the average value as a first ultraviolet intensity reference value;
step (2), preparing N pieces of control water samples with known organic matter content and different content, keeping the detection group LED ultraviolet lamp 1 on, respectively sequentially passing the N pieces of control water samples through the detection tube 2, and outputting a control signal to the current control circuit 5 through the signal processing circuit 6 according to the same mode of the step (1), so that the current flowing through the detection group LED ultraviolet lamp 1 shows linear change; then the signal processing circuit 6 records the ultraviolet intensity signals amplified by the detection group signal amplifying circuit 4 when N comparison water samples under different current conditions flow through the detection tube 2, averages the ultraviolet intensity values under the different current conditions, and marks the average value of the ultraviolet intensity values as a second ultraviolet intensity reference value, a third ultraviolet intensity reference value and a … … (n+1) th ultraviolet intensity reference value, wherein N is a natural number greater than or equal to 3;
step (3), according to the N ultraviolet intensity reference values obtained in the step (2), a comparison table between the organic matter content in a comparison water sample and the ultraviolet intensity values amplified by the detection group signal amplifying circuit 4 under different current conditions is obtained;
step (4), keeping the detection group LED ultraviolet lamp 1 and the comparison group LED ultraviolet lamp 10 on, enabling water to be detected to flow through the detection tube 2, and outputting a control signal to the current control circuit 5 through the signal processing circuit 6 in the same manner as in the step (1), so that currents flowing through the detection group LED ultraviolet lamp 1 and the comparison group LED ultraviolet lamp 10 show linear changes; the signal processing circuit 6 records the ultraviolet intensity signals amplified by the comparison group signal amplifying circuit 9 under different current conditions, averages the ultraviolet intensity values, marks the average value of the ultraviolet intensity as a temporary ultraviolet intensity reference value, divides the temporary ultraviolet intensity reference value by a first ultraviolet intensity reference value, and obtains the light source intensity attenuation proportion; meanwhile, the signal processing circuit 6 records the ultraviolet intensity signals amplified by the detection group signal amplifying circuit 4 under different current conditions, averages the ultraviolet intensity values, marks the average value of the ultraviolet intensity as an ultraviolet intensity detection value, divides the ultraviolet intensity detection value by the light source intensity attenuation proportion to obtain an ultraviolet intensity searching value, and then adopts the ultraviolet intensity searching value to obtain the organic matter content in the water to be detected at the moment by inquiring the comparison table obtained in the step (3).
Claims (5)
1. The utility model provides a water quality on-line measuring system, includes water quality on-line measuring unit (101), and controller unit (105) that is connected with water quality on-line measuring unit (101), and display element (102) that is connected with controller unit (105), its characterized in that: the water quality on-line detection unit (101) at least comprises an organic matter detection sensor for detecting the organic matter content of water quality, wherein the organic matter detection sensor comprises a light source capable of emitting ultraviolet rays, a detection component and a comparison component which are matched with the light source and capable of detecting the organic matter content in water, the light source is a detection group LED ultraviolet lamp (1), the detection group LED ultraviolet lamp (1) is connected with a current control circuit (5), and the current flowing through the detection group LED ultraviolet lamp is controlled by the current control circuit (5); the detection assembly comprises
A detection tube (2) capable of being penetrated by ultraviolet rays emitted by the detection group LED ultraviolet lamp (1), and water can pass through the detection tube (2);
a detection group ultraviolet receiver (3) for detecting the intensity of ultraviolet rays emitted from the detection group LED ultraviolet lamp (1) and penetrating the detection tube (2);
the output end of the detection group signal amplifying circuit (4) is connected with the input end of the detection group signal amplifying circuit (4) and is used for amplifying the ultraviolet intensity signal detected by the detection group ultraviolet receiver (3);
the output end of the detection group signal amplifying circuit (4) is connected with the signal processing circuit (6), and the signal processing circuit (6) is also connected with the current control circuit (5);
the control component comprises:
the control group LED ultraviolet lamp (10), the control group LED ultraviolet lamp (10) is connected with the current control circuit (5) after being connected in series with the detection group LED ultraviolet lamp (1), and the current control circuit (5) controls the current flowing through the detection group LED ultraviolet lamp and the control group LED ultraviolet lamp (10);
a control tube (7) which can be penetrated by ultraviolet rays emitted by the LED ultraviolet lamp (10) of the control group, wherein the interior of the control tube (7) is vacuumized or provided with air or purified water;
a control group ultraviolet receiver (8) for detecting the intensity of ultraviolet rays emitted from the control group LED ultraviolet lamp (10) and penetrating the control tube (7);
the control group signal amplifying circuit (9), the output end of the control group ultraviolet receiver (8) is connected with the input end of the control group signal amplifying circuit (9), and is used for amplifying the ultraviolet intensity signal detected by the control group ultraviolet receiver (8);
the output end of the comparison group signal amplifying circuit (9) is also connected with the signal processing circuit (6), and the signal processing circuit (6) calculates the content of organic matters in water passing through the detection tube (2) according to the ultraviolet intensity signal amplified by the detection group signal amplifying circuit (4) and the ultraviolet intensity signal amplified by the comparison group signal amplifying circuit (9);
the detection method of the organic matter detection sensor comprises the following steps:
step (1), starting the LED ultraviolet lamp of the detection group and the LED ultraviolet lamp of the comparison group, and outputting a control signal to a current control circuit through a signal processing circuit so that the current flowing through the LED ultraviolet lamp of the comparison group shows linear change; then the signal processing circuit records the ultraviolet intensity signals amplified by the signal amplifying circuit of the comparison group under different current conditions respectively, averages the ultraviolet intensity values, and then marks the average value as a first ultraviolet intensity reference value;
step (2), preparing N parts of control water samples with known organic matter content and different content, keeping the LED ultraviolet lamps of the detection group on, respectively sequentially passing the N parts of control water samples through the detection tube, and outputting control signals to a current control circuit through a signal processing circuit according to the same mode of the step (1), so that the current flowing through the LED ultraviolet lamps of the detection group shows linear change; then the signal processing circuit records the ultraviolet intensity signals amplified by the detection group signal amplifying circuit when N comparison water samples under different current conditions flow through the detection tube, then averages the ultraviolet intensity values under the N different current conditions respectively, and marks the average values of the ultraviolet intensity values as a second ultraviolet intensity reference value, a third ultraviolet intensity reference value and a … … (n+1) th ultraviolet intensity reference value, wherein N is a natural number greater than or equal to 3;
step (3), according to the N ultraviolet intensity reference values obtained in the step (2), a comparison table between the organic matter content in a comparison water sample and the ultraviolet intensity values amplified by the detection group signal amplifying circuit under different current conditions is obtained;
step (4), keeping the LED ultraviolet lamps of the detection group and the LED ultraviolet lamps of the comparison group on, enabling water to be detected to flow through the detection tube, and outputting control signals to a current control circuit through a signal processing circuit in the same manner as in the step (1), so that currents flowing through the LED ultraviolet lamps of the detection group and the LED ultraviolet lamps of the comparison group show linear changes; the signal processing circuit records the ultraviolet intensity signals amplified by the signal amplifying circuit of the comparison group under different current conditions, averages the ultraviolet intensity values, marks the average value of the ultraviolet intensity as a temporary ultraviolet intensity reference value, divides the temporary ultraviolet intensity reference value by a first ultraviolet intensity reference value, and obtains the light source intensity attenuation proportion; meanwhile, the signal processing circuit 6 records the ultraviolet intensity signals amplified by the detection group signal amplifying circuit under different current conditions, averages the ultraviolet intensity values, marks the average ultraviolet intensity value as an ultraviolet intensity detection value, divides the ultraviolet intensity detection value by the light source intensity attenuation proportion to obtain an ultraviolet intensity searching value, and then adopts the ultraviolet intensity searching value to obtain the organic matter content in the water to be detected at the moment by inquiring the comparison table obtained in the step (3).
2. The on-line water quality detection system according to claim 1, wherein: the organic matter detection sensor further comprises a shell (11), a detection tube accommodating cavity and a contrast tube accommodating cavity are arranged in the shell (11), and a detection tube (2) is arranged in the detection tube accommodating cavity; the reference tube (7) is arranged in the reference tube accommodating cavity; the current control circuit (5), the detection group LED ultraviolet lamp (1) and the comparison group LED ultraviolet lamp (10) are arranged on one side of the shell (11), and the detection group ultraviolet receiver (3), the detection group signal amplifying circuit (4), the comparison group ultraviolet receiver (8), the comparison group signal amplifying circuit (9) and the signal processing circuit (6) are arranged on the other opposite side of the shell (11); the shell (11) is internally provided with a first light transmission channel and a second light transmission channel which are communicated with the accommodating cavity of the detection tube and positioned at two opposite sides of the accommodating cavity of the detection tube, and ultraviolet light emitted by the LED ultraviolet lamp (1) of the detection group passes through the first light transmission channel, the detection tube (2) and the second light transmission channel and then reaches the ultraviolet receiver (3) of the detection group; the shell (11) is internally provided with a third light-transmitting channel and a fourth light-transmitting channel which are communicated with the control tube accommodating cavity and are positioned on two opposite sides of the control tube accommodating cavity, and ultraviolet light emitted by the LED ultraviolet lamp (10) of the control group reaches the ultraviolet receiver (8) of the control group after passing through the third light-transmitting channel, the control tube (7) and the fourth light-transmitting channel.
3. The on-line water quality detection system according to claim 1, wherein: also comprises an alarm unit (103) connected with the controller unit (105).
4. The on-line water quality detection system according to claim 1, wherein: the device also comprises a water quality purifying unit (104) arranged on the rear pipeline of the water quality on-line detecting unit (101).
5. The on-line water quality detection system according to claim 1, wherein: the water quality on-line detection unit (101) further comprises a turbidity sensor and a conductivity sensor.
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| CN109443972B (en) * | 2018-11-29 | 2021-03-26 | 浙江工贸职业技术学院 | Waste water monitoring method with electronic balance and device thereof |
| CN109443987B (en) * | 2018-11-29 | 2021-03-26 | 浙江工贸职业技术学院 | Waste water monitoring method with hydrometer and device thereof |
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