CN107340258B - System for detecting organic matters in air - Google Patents
System for detecting organic matters in air Download PDFInfo
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- CN107340258B CN107340258B CN201710195783.7A CN201710195783A CN107340258B CN 107340258 B CN107340258 B CN 107340258B CN 201710195783 A CN201710195783 A CN 201710195783A CN 107340258 B CN107340258 B CN 107340258B
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- 238000001514 detection method Methods 0.000 claims abstract description 204
- 239000005416 organic matter Substances 0.000 claims abstract description 57
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000008213 purified water Substances 0.000 claims description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 241000700605 Viruses Species 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/062—LED's
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention relates to a detection system for organic matters in air, which is characterized in that: the device comprises an air pump for extracting air, an organic matter detection sensor connected with the output end of the air pump, and a display screen connected with the organic matter detection sensor, wherein the organic matter detection sensor comprises a light source capable of emitting ultraviolet rays and a detection component matched with the light source and capable of detecting the content of organic matters in the air, 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, a signal processing circuit and a display screen connected with the signal processing circuit. Compared with the prior art, the air pump is used for pumping air into the organic matter detection sensor, the organic matter detection sensor can effectively detect the organic matter content in the air, and the organic matter content in the air is displayed through the display screen.
Description
Technical Field
The invention relates to a system for detecting organic matters in air, which is used for detecting the total content of the organic matters in the air.
Background
Organic matters in the air, especially volatile gases in some finishing materials, such as formaldehyde, organic benzene (benzene and toluene), organic ammonia, chloroform and the like, have great harm to the body. In addition, bacteria, mold, viruses and the like in the air have great harm to human bodies. The existing products and technologies in the market cannot effectively detect the organic matter content in the air, so that development of a practical and effective air organic matter content detection device has great significance.
Disclosure of Invention
The invention aims to provide an air organic matter detection system aiming at the prior art.
The technical scheme adopted for solving the technical problems is as follows: an air organic matter detecting system, which is characterized in that: the device comprises an air pump for extracting air, an organic matter detection sensor connected with the output end of the air pump, and a display screen connected with the organic matter detection sensor, wherein the organic matter detection sensor comprises a light source capable of emitting ultraviolet rays and a detection component matched with the light source and capable of detecting the content of organic matters in the air, 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 signal processing circuit is connected with the output end of the detection group signal amplifying circuit and the current control circuit, and the signal processing circuit calculates the content of organic matters in the air passing through the detection tube according to the ultraviolet intensity signal amplified by the detection group signal amplifying circuit;
the display screen is connected with the signal processing circuit and used for displaying the organic matter content in the air.
As an improvement, the organic matter detection sensor 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 contrast assembly 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 the air 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.
And an air filtering device for filtering solid particles in the air is arranged in front of the air pump.
Compared with the prior art, the invention has the advantages that: the air pump is used for pumping air into the organic matter detection sensor, the organic matter detection sensor can effectively detect the organic matter content in the air, and the organic matter content in the air is displayed through the display screen.
Drawings
FIG. 1 is a schematic diagram of a system for detecting organic matters in air according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of an organic matter detection sensor according to a first embodiment of the present invention;
FIG. 3 is a schematic perspective view of an organic matter detection sensor according to a first embodiment of the present invention;
FIG. 4 is a perspective sectional view of an organic matter detection sensor according to a first embodiment of the present invention;
FIG. 5 is a schematic diagram of an organic matter detection sensor according to a second embodiment of the present invention;
FIG. 6 is a schematic perspective view of an organic matter detection sensor according to a second embodiment of the present invention;
FIG. 7 is a perspective sectional view of an organic matter detection sensor according to a second embodiment of the present invention;
FIG. 8 is a perspective cross-sectional view of an organic matter detection sensor according to a second embodiment of the present invention;
fig. 9 is a perspective cross-sectional view of a further view of an organic matter detection sensor according to a second embodiment of the present invention;
fig. 10 is a schematic diagram of a system for detecting organic matters in air according to a third embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
Example 1
The system for detecting organic matters in air shown in fig. 1 comprises an air pump 101 for pumping air, an organic matter detection sensor 102 connected with an output end of the air pump and used for detecting the organic matters in the air, and a display screen 103 connected with the organic matter detection sensor 102 and used for displaying the organic matters in the air.
In this embodiment, the organic matter detection sensor 102, as shown in fig. 2 to 4, includes 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 the air; 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 the air 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 shell 11 is connected with an air inlet joint 12 and an air outlet joint 13 which are respectively communicated with the two ends of the detection tube, and sealing rings 14 are arranged at the connection parts of the air inlet joint and the air outlet joint with the two ends of the detection tube.
The detection method of the organic matter detection sensor comprises the following steps:
step (1), vacuumizing a detection tube 2 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 comparison air samples with known organic matter content and different content, keeping the detection group LED ultraviolet lamp 1 on, respectively sequentially passing the N comparison air 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 air samples under different current conditions pass through the detection tube 2, 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+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 air 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 air to be detected to pass through the detection tube 2 through an air pump, 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 air to be detected at the moment by inquiring the comparison table obtained in the step (3).
Example two
Unlike the first embodiment, the organic matter detection sensor further includes a comparison module, as shown in fig. 5 to 9, which 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 air 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.
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 housing 11 is further 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 are positioned at 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 passes through the third light-transmitting channel 11c, the comparison tube 7 and the fourth light-transmitting channel 11d and then reaches the ultraviolet receiver 8 of the comparison group, as shown in fig. 4-8.
The detection method of the organic matter detection sensor in the embodiment 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 comparison air samples with known organic matter content and different content, keeping the detection group LED ultraviolet lamp 1 on, respectively sequentially passing the N comparison air 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 air samples under different current conditions flow through the detection tube 2 respectively, averages the ultraviolet intensity values under the N different current conditions respectively, and records 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 air 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, pumping air to be detected through an air pump 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) through the detection tube 2, so that the current flowing through the detection group LED ultraviolet lamp 1 and the comparison group LED ultraviolet lamp 10 shows linear change; 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 lookup value, and then adopts the ultraviolet intensity lookup value to obtain the organic matter content in the air to be detected at the moment by inquiring the comparison table obtained in the step (3).
Example III
Unlike the first embodiment, an air filter 104 for filtering solid particles in the air is provided in front of the air pump, as shown in fig. 6.
Since solid particles (such as PM 2.5) in the air have a blocking effect on light, the PM2.5 content in the air is different at different times, and the light blocking effect is also different, in the first embodiment, the PM2.5 has a certain interference on the detection result of the organic matter detection sensor. This embodiment can minimize this interference. Because the volume of solid particles in the air is far greater than the volumes of organic matters such as bacteria, formaldehyde and organic benzene, the solid particles in the air can be effectively intercepted by the air filtering device, the organic matters needing to be detected can smoothly pass through the filtering device, and the air filtering device plays a certain role in protecting the organic matter detection sensor.
Claims (2)
1. An air organic matter detecting system, which is characterized in that: the device comprises an air pump (101) for extracting air, an organic matter detection sensor (102) connected with the output end of the air pump, and a display screen (103) connected with the organic matter detection sensor (102), wherein the organic matter detection sensor (102) comprises a light source capable of emitting ultraviolet rays and a detection component matched with the light source and capable of detecting the content of organic matters in the air, 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), 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 the air passing through the detection tube (2) according to the ultraviolet intensity signal amplified by the detection group signal amplifying circuit (4);
the display screen (103) is connected with the signal processing circuit (6) and is used for displaying the organic matter content in the air;
the organic matter detection sensor (102) further comprises a comparison component, and the comparison 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 the air 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 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 at two opposite sides of the control tube accommodating cavity, and ultraviolet light emitted by the LED ultraviolet lamp (10) of the control group passes through the third light-transmitting channel, the control tube (7) and the fourth light-transmitting channel and then reaches the ultraviolet receiver (8) of the control group;
the organic matter detection sensor comprises the following steps of:
step (1), starting the LED ultraviolet lamp (1) of the detection group and the LED ultraviolet lamp (10) of the comparison group, and outputting a control signal to the current control circuit (5) through the signal processing circuit (6) so that the current flowing through the LED ultraviolet lamp (10) of the comparison group 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 comparison air samples with known organic matter content and different content, keeping the detection group LED ultraviolet lamps (1) on, respectively sequentially passing the N comparison air samples through the detection tube (2), and outputting a control signal to a current control circuit (5) through a signal processing circuit (6) in the same manner as in the step (1) so that the current flowing through the detection group LED ultraviolet lamps (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 air samples under different current conditions respectively flow through the detection tube (2), then averages the ultraviolet intensity values under N different current conditions respectively, and records 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 air 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, pumping air to be detected through an air pump, and outputting a control signal to a current control circuit (5) through a signal processing circuit (6) in the same manner as in the step (1) through a detection tube (2), 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, then averages the ultraviolet intensity values, marks the average value of the ultraviolet intensity as a temporary ultraviolet intensity reference value, and divides the temporary ultraviolet intensity reference value by a first ultraviolet intensity reference value to obtain the light source intensity attenuation proportion; and 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 content of the organic matters in the air to be detected at the moment by inquiring the comparison table obtained in the step (3).
2. The system for detecting organic matter in air according to claim 1, wherein: an air filtering device (104) for filtering solid particles in the air is arranged in front of the air pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710195783.7A CN107340258B (en) | 2017-03-29 | 2017-03-29 | System for detecting organic matters in air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710195783.7A CN107340258B (en) | 2017-03-29 | 2017-03-29 | System for detecting organic matters in air |
Publications (2)
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