CN113433106B - Sulfur dioxide detection structure, system and method based on ultraviolet fluorescence method - Google Patents
Sulfur dioxide detection structure, system and method based on ultraviolet fluorescence method Download PDFInfo
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- CN113433106B CN113433106B CN202110991725.1A CN202110991725A CN113433106B CN 113433106 B CN113433106 B CN 113433106B CN 202110991725 A CN202110991725 A CN 202110991725A CN 113433106 B CN113433106 B CN 113433106B
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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
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
Abstract
The invention relates to the technical field of detection, in particular to a sulfur dioxide detection structure based on an ultraviolet fluorescence method, which comprises the following steps: the device comprises a light source component, a reaction gas chamber, a photomultiplier tube component, a booster circuit board, a power supply and a signal processing and feedback component, wherein the signal processing and feedback component is respectively connected with the booster circuit board, the power supply and the photomultiplier tube component and controls electric energy output and gain adjustment; the device also comprises a photosensitive sensor which is connected with the signal processing and feedback assembly, the photosensitive sensor detects the intensity of the ultraviolet light, and the detection result is used as the output basis of the booster circuit board and the power supply. The intensity of the ultraviolet light is accurately monitored and adjusted, and the electric energy provided to the photomultiplier tube assembly can be adjusted, so that the electric signals obtain different gains to buffer the change of the detection result caused by the change of the intensity of the ultraviolet light, and the more accurate detection result is obtained. The invention also claims a sulfur dioxide detection system and method based on the ultraviolet fluorescence method.
Description
Technical Field
The invention is applicable to the technical field of detection, and particularly relates to a sulfur dioxide detection structure, system and method based on an ultraviolet fluorescence method.
Background
In recent years, with the rapid development of the industry in China, a large number of coal mines and coal-fired power generation are exploited, the atmosphere is polluted to a great extent by smelting steel and nonferrous metals, and the like, and the monitoring of the sulfur dioxide in the atmosphere by an ultraviolet fluorescence method is a more common technical means at present.
In the related detecting device, the fluorescence changes due to the fluctuation of the ultraviolet light intensity, which causes the deviation of the sulfur dioxide result measured finally.
In view of the above problems, the present designer is expecting to design a sulfur dioxide detection structure, system and method based on ultraviolet fluorescence method based on the practical experience and professional knowledge that is abundant for many years in engineering application of such products and with the application of theory and active research and innovation.
Disclosure of Invention
The invention provides a sulfur dioxide detection structure based on an ultraviolet fluorescence method, which can effectively solve the problems in the background technology, and simultaneously, the invention also requests to protect a sulfur dioxide detection system and method based on the ultraviolet fluorescence method, and has the same technical effect.
In order to achieve the purpose, the invention adopts the technical scheme that:
a sulfur dioxide detects structure based on ultraviolet fluorescence method includes:
a light source assembly providing ultraviolet light of a specific wavelength;
the reaction gas chamber provides a closed space for the sample gas to be detected to enter and exit, and the sample gas absorbs the ultraviolet light to release fluorescence in the closed space;
a photomultiplier tube assembly that converts the signal of the fluorescence into an electrical signal;
the boosting circuit board is connected with the light source component and supplies power to the light source component;
the power supply is connected with the photomultiplier tube assembly and supplies power to the photomultiplier tube assembly;
the signal processing and feedback assembly is respectively connected with the booster circuit board, the power supply and the photomultiplier assembly, controls the output of the booster circuit board and the power supply, and converts the electric signal into the detection result of the sulfur dioxide;
the system is characterized by further comprising a photosensitive sensor, wherein the photosensitive sensor is connected with the signal processing and feedback assembly and is used for detecting the intensity of ultraviolet light, and the intensity detection result is used as the output basis of the booster circuit board and the power supply.
Further, the light source assembly comprises:
the xenon lamp is connected with the power supply and provides 185-2000nm wavelength diffusion light under the supply of electric energy;
an extraction structure for extracting ultraviolet light with wavelength of 206-224nm from the scattered light;
the extraction structure comprises:
a sleeve for fixing the xenon lamp;
a first adjustment assembly for performing direction parallel adjustment of the astigmatism from the xenon lamp;
the light filtering component comprises a mounting seat and a plurality of reflectors, wherein the reflectors are fixedly connected with the mounting seat and enclose a closed light path space together with the mounting seat, and each reflector reflects ultraviolet light with the wavelength of 206-224nm and allows light outside the wavelength range to pass through.
Further, the mirror includes:
the connecting plate is fixedly connected with the mounting seat;
the base is connected with the connecting plate and inserted into the light path space, and a concave area is arranged on the base;
and the lens is arranged on the base, seals the concave area, reflects ultraviolet light with the wavelength of 206-224nm and allows light outside the wavelength range to enter the concave area.
Further, the light source assembly further comprises a second regulating assembly comprising:
the light-transmitting seat is fixedly connected with the mounting seat, a through cavity is arranged in the light-transmitting seat, and at least one step surface is arranged on the inner wall of the through cavity;
the baffle is arranged between the mounting seat and the light-transmitting seat and is provided with a hole site with a specific shape, and the hole site is used for light rays from the mounting seat to pass through;
the convex lens is arranged in the through cavity, one side of the convex lens is blocked and limited through the step surface, and a sealing structure is arranged between the convex lens and the step surface;
and the compression ring is fixedly connected with the light-transmitting seat and is used for extruding the outer ring of the other side of the convex lens to realize the laminating of the convex lens and the step surface.
Further, still include the third regulating assembly, set up in between reaction gas chamber and the photomultiplier subassembly and supply the fluorescence to pass through, the third regulating assembly includes: the lens comprises a first plano-convex lens, a second plano-convex lens, a filter and a dividing ring;
the first plano-convex lens and the second plano-convex lens are arranged in hole sites on the reaction gas chamber, the convex surfaces are arranged oppositely, the dividing ring is arranged between the first plano-convex lens and the second plano-convex lens, and a sealing structure is arranged between the dividing ring and at least one plano-convex lens;
the photomultiplier tube assembly extrudes and fixes the first plano-convex lens, the second plano-convex lens and the segmentation ring, and fixes the filter plate.
Furthermore, the light source reflection funnel is arranged outside the photosensitive sensor in a covering mode.
Furthermore, an annular groove body is arranged at the end part of the reaction gas chamber, a convex edge is arranged at the end part of the light source reflection funnel, the convex edge is arranged in the annular groove body, and a sealing structure is arranged on the outer ring;
the signal processing and feedback assembly extrudes and fixes the convex edge and the sealing structure in the annular groove body.
Further, signal processing and feedback subassembly are right through double-deck plate body protruding edge with seal structure extrudees, the photosensitive sensor centre gripping is between the double-deck plate body, and wherein, one deck plate body supplies through the hole site photosensitive sensor's sense terminal exposes in reaction air indoor, and another deck plate body supplies through the hole site photosensitive sensor's signal output part is drawn forth, photosensitive sensor at least and one deck plate body intervally around the hole site is provided with seal structure.
A sulfur dioxide detection system based on an ultraviolet fluorescence method comprises:
an ultraviolet light output unit which provides ultraviolet light of a specific wavelength;
the sample gas to be detected enters and exits the closed space, and the sample gas absorbs the ultraviolet light to release fluorescence in the closed space;
a signal conversion unit converting the signal of the fluorescence into an electric signal;
the two independent electric energy supply units are respectively connected with the ultraviolet light output unit and the signal conversion unit and supply power to the ultraviolet light output unit and the signal conversion unit;
the control unit is respectively connected with the electric energy supply unit and the signal conversion unit, controls the output of the electric energy supply unit, and converts the electric signal into the detection result of the sulfur dioxide;
the detection unit is connected with the control unit and is used for detecting the intensity of the ultraviolet light, and the intensity detection result is used as the output basis of the electric energy supply unit.
A sulfur dioxide detection method based on an ultraviolet fluorescence method comprises the following steps:
converting the first part of electric energy into ultraviolet light with specific wavelength;
irradiating sample gas to be detected in the closed space through the ultraviolet light, wherein the sample gas absorbs the ultraviolet light to release fluorescence;
converting the signal of the fluorescence into an electrical signal and providing a gain to the electrical signal by a second portion of the electrical energy supply;
converting the electric signal into a detection result of sulfur dioxide;
and detecting the intensity of the ultraviolet light, and adjusting the first part of electric energy and the second part of electric energy according to the intensity.
Through the technical scheme of the invention, the following technical effects can be realized:
through the arrangement of the detection units such as the photosensitive sensor and the like, on one hand, the intensity of the ultraviolet light is accurately monitored, and the output of the booster circuit board can be adjusted according to the monitoring result, so that the intensity of the ultraviolet light is maintained in a relatively stable state, and smooth generation of fluorescence is ensured; on the other hand, according to the intensity of the ultraviolet light, the electric energy provided by the power supply to the signal conversion units such as the photomultiplier tube assembly and the like can be adjusted, so that the electric signals obtain different gains, the detection result change caused by the intensity change of the ultraviolet light is buffered, and a more accurate detection result is obtained.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a sulfur dioxide detection structure based on UV fluorescence in the first embodiment;
FIG. 2 is a schematic view of a light source module;
FIG. 3 is a schematic sectional view of a combined structure of a reflector and a mounting base;
FIG. 4 is a schematic structural diagram of a reflector;
FIG. 5 is a cross-sectional view of the reflector;
FIG. 6 is a cross-sectional view of the reaction gas chamber after attachment of a second conditioning assembly and a photosensor;
FIG. 7 is a cross-sectional view of a second adjustment assembly;
FIG. 8 is an enlarged view of a portion of FIG. 2 at A;
FIG. 9 is a schematic view of the combination of the light-transmissive seat and the pressure ring;
FIG. 10 is a cross-sectional view of the reaction gas chamber after attachment to a photomultiplier tube assembly;
FIG. 11 is an enlarged view of a portion of FIG. 10 at B;
FIG. 12 is an enlarged view of a portion of FIG. 6 at C;
FIG. 13 is a schematic diagram of the relative position of the signal board and the power supply;
FIG. 14 is a block diagram of a sulfur dioxide detection system based on UV fluorescence in example two;
FIG. 15 is a flowchart of a sulfur dioxide detection method based on UV fluorescence in example III;
reference numerals: 1. a light source assembly; 11. a xenon lamp; 12. a sleeve; 13. a mirror; 13a, a connecting plate; 13b, a base; 13c, a recessed region; 13d, a lens; 14. a mounting seat; 15. a second adjustment assembly; 15a, a light-transmitting seat; 15b, a baffle; 15c, a convex lens; 15d, pressing a ring; 2. a reaction gas chamber; 3. a photomultiplier tube assembly; 4. a power source; 5. a signal processing and feedback assembly; 6. a photosensitive sensor; 7. a third adjustment assembly; 71. a first plano-convex lens; 72. a second plano-convex lens; 73. a filter disc; 74. dividing a ring; 8. a light source reflecting funnel; 81. a convex edge; 9. and a signal plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example one
As shown in fig. 1 to 13, a sulfur dioxide detection structure based on an ultraviolet fluorescence method includes: a light source assembly 1 providing ultraviolet light of a specific wavelength; the reaction gas chamber 2 is used for providing a closed space for the sample gas to be detected to enter and exit, and the sample gas absorbs ultraviolet light to release fluorescence in the closed space; a photomultiplier tube assembly 3 that converts a signal of fluorescence into an electric signal; the boosting circuit board is connected with the light source component 1 and supplies power to the light source component 1; the power supply 4 is connected with the photomultiplier tube assembly 3 and supplies power to the photomultiplier tube assembly 3; the signal processing and feedback assembly 5 is respectively connected with the booster circuit board, the power supply 4 and the photomultiplier tube assembly 3, controls the output of the booster circuit board and the power supply 4, and converts an electric signal into a detection result of sulfur dioxide; the ultraviolet light detection device further comprises a photosensitive sensor 6 which is connected with the signal processing and feedback assembly 5, the photosensitive sensor 6 detects the intensity of ultraviolet light, and the intensity detection result is used as the output basis of the booster circuit board and the power supply 4. Wherein, the reaction gas chamber 2 is internally plated with a coating for preventing ultraviolet light reflection, thereby achieving higher sensitivity and lower noise.
The invention provides a sulfur dioxide detection structure based on an ultraviolet fluorescence method, wherein ultraviolet light from a light source assembly 1 irradiates a sample gas in a reaction gas chamber 2, sulfur dioxide molecules in the sample gas can release fluorescence with the wavelength of 220-420 nm after the sample gas containing the sulfur dioxide absorbs the ultraviolet light with a specific wavelength, a signal processing and feedback assembly 5 calculates the concentration of the sulfur dioxide in the sample gas by detecting the intensity of the fluorescence, and the intensity of the fluorescence is obtained by evaluating a converted electric signal.
In the implementation process, in order to ensure the accuracy of the detection result, the arrangement of the photosensitive sensor 6 enables the intensity of the ultraviolet light to be accurately monitored, and the signal processing and feedback assembly 5 can adjust the electric energy provided by the booster circuit board to the light source assembly 1 according to the monitoring result, so that the intensity of the ultraviolet light is maintained in a relatively stable state, and the smooth generation of fluorescence is ensured; on the other hand, the power supplied from the power supply 4 to the photomultiplier tube assembly 3 may be adjusted according to the intensity of the ultraviolet light so that the electrical signal may obtain different gains to buffer the change in the detection result caused by the change in the intensity of the ultraviolet light, thereby obtaining a more accurate detection result, for example, when the intensity of the ultraviolet light is detected to be weakened, the intensity of the ultraviolet light may be increased by adjusting the power supplied from the light source assembly 1, but such a change may cause a sudden fluctuation in the detection result, and in order to buffer the fluctuation, the power supplied to the photomultiplier tube assembly 3 is adjusted at the same time, thereby adaptively compensating for the moment of the change in the intensity of the ultraviolet light by appropriately decreasing the gain to the signal, and of course, such a gain adjustment is instantaneous.
In the implementation process, can adopt signal panel 9 and high-voltage board respectively, be connected signal panel 9 and photosensitive sensor 6, different high-voltage boards are connected with light source subassembly 1 and photomultiplier subassembly 3, signal panel 9 receives the pulse signal of photosensitive sensor 6 and photomultiplier subassembly 3 two parts, convert it into stable voltage signal output, thereby the intensity of 11 light sources of real-time supervision xenon lamp realizes the monitoring and the regulation of ultraviolet luminous intensity, and gather stable voltage signal output in real time and give the main control board, the high-voltage board as power 4 provides 400 and supplyes 1000V adjustable high pressure for photomultiplier subassembly 3, thereby provide the effect of adjustable gain for photomultiplier subassembly 3.
As a preference of the present embodiment, as shown in fig. 2 and 3, the light source assembly 1 includes: the xenon lamp 11 is connected with the power supply 4 and provides 185-2000nm wavelength diffusion light under the supply of electric energy; an extraction structure for extracting ultraviolet light with wavelength of 206-224nm from the scattered light; the extraction structure comprises: a sleeve 12 for fixing the xenon lamp 11; a first adjustment member for performing a direction parallel adjustment of the astigmatism from the xenon lamp 11; the filter assembly includes a mounting base 14 and a plurality of reflectors 13, the reflectors 13 are fixedly connected to the mounting base 14, and enclose a closed light path space together with the mounting base 14, and each reflector 13 reflects ultraviolet light with wavelength of 206-224nm and allows light outside the wavelength range to pass through.
The astigmatism that from xenon lamp 11 transmission gets into sleeve 12 and reachs first regulation subassembly after the transmission, the structure that carries out the direction regulation to the astigmatism can adopt lens, in this embodiment specifically, adopt two plano-convex lens, the planar part laminating setting of two lens can effectively play the purpose of carrying out parallel adjustment to the astigmatism, wherein, preferably first regulation subassembly also installs through sleeve 12, and sleeve 12's length then can carry out adaptability adjustment according to plano-convex lens's focus position, perhaps, sleeve 12 length is unchangeable, through the regulation of first regulation subassembly mounted position in sleeve 12 also can realize above-mentioned technical purpose.
As a preference of the above embodiment, as shown in fig. 4 and 5, the mirror 13 includes: the connecting plate 13a is fixedly connected with the mounting seat 14; a base 13b connected to the connection plate 13a and inserted into the optical path space, the base 13b being provided with a recess region 13 c; the lens 13d is installed on the base 13b, seals the recessed area 13c, reflects the ultraviolet light with wavelength of 206-224nm, and allows the light outside the wavelength range to enter the recessed area 13 c.
In the preferred embodiment, a reflector 13 with a flexible structure is provided, and specifically, the connection plate 13a is provided to fix the base 13b, and to block the open area of the mounting seat 14, which can be used to achieve any one of the above technical objectives during the use process; the connecting plate 13a and the base 13b are in a split structural form, so that the angle of the base 13b relative to the connecting plate 13a can be adjusted, the two can be attached through a plane in the process of connecting the two, and the two are connected through a connecting piece perpendicular to the plane, the base 13b can realize angle adjustment through rotation around the connecting piece under the structure, and finally, the two can be fixed mutually through locking of the connecting piece; through the structure, the installation number and the installation angle of the lenses 13d can be adjusted, so that the light path direction in the light path space can be changed into various possibilities; the lens 13d can selectively reflect and transmit light by means of coating.
Referring to fig. 6 to 9, the light source assembly 1 further includes a second adjusting assembly 15, and the second adjusting assembly 15 includes: the light-transmitting seat 15a is fixedly connected with the mounting seat 14, a through cavity is arranged in the light-transmitting seat 15a, and at least one step surface is arranged on the inner wall of the through cavity; the baffle 15b is arranged between the mounting seat 14 and the light-transmitting seat 15a and is provided with a hole with a specific shape, and light rays from the mounting seat 14 can pass through the hole; the convex lens 15c is arranged in the through cavity, one side of the convex lens is blocked and limited through a first-stage step surface, and a sealing structure is arranged between the convex lens and the step surface; and the pressing ring 15d is fixedly connected with the light-transmitting seat 15a and extrudes the outer ring on the other side of the convex lens to realize the attachment of the convex lens and the step surface.
Through the arrangement of the second adjusting component 15, the reflected and filtered light beams can be subjected to secondary filtering through hole sites with specific shapes, and the light beam with the required wavelength at the middle is selected; the hole site of the specific shape is preferably a waist-shaped narrow hole, so that enough light beams, namely light intensity, can reach the inside of the reaction gas chamber 2, part of scattered light interference on the periphery is blocked, and the detection sensitivity is ensured; and secondly, compared with the circular shape, the waist shape has lower requirements corresponding to the position of the photosensitive sensor 6 at the rear end of the reaction gas chamber 2, and closed-loop feedback can be formed more easily. In the implementation process, the sealing structure between the convex lens and the light-transmitting seat 15a prevents the gas in the reaction gas chamber 2 from leaking, and meanwhile, the sealing structure is flexibly attached to the convex lens, so that the damage probability of the convex lens is reduced.
The whole second adjusting component 15 is in an independent structural form, the structural form is more flexible, and the size adjustment is more convenient.
Sulfur dioxide detection structure based on ultraviolet fluorescence method in this embodiment still includes third adjusting part 7, sets up and supplies fluorescence to pass through between reaction chamber 2 and photomultiplier 3, and third adjusting part 7 includes: a first plano-convex lens 71, a second plano-convex lens 72, a filter 73, and a split ring 74; the first plano-convex lens 71 and the second plano-convex lens 72 are arranged in hole sites on the reaction gas chamber 2, the convex surfaces are arranged oppositely, the dividing ring 74 is arranged between the two, and a sealing structure is arranged between the dividing ring and at least one plano-convex lens; the photomultiplier tube assembly 3 presses and fixes the first plano-convex lens 71, the second plano-convex lens 72, and the partition ring 74, and fixes the filter 73.
In the above preferred embodiment, the sealing structure between the convex lens and the light-transmitting seat 15a ensures the sealing property of the reaction gas chamber 2 on the side of the light source assembly 1, while in the present preferred embodiment, the sealing structure between the dividing ring 74 and the flat convex lens ensures the sealing property of the reaction gas chamber 2 on the side of the photomultiplier tube assembly 3. The third adjusting component 7 makes the part of the generated fluorescence with the wavelength between 220 nm and 420nm enter the photomultiplier tube component 3.
Preferably, the light source reflection funnel 8 is further included, the light source reflection funnel 8 is covered outside the photosensitive sensor 6, and the light source reflection funnel 8 is arranged to prevent the wavelength light beam (206-224 nm) from forming secondary reflection in the reaction gas chamber, so as to achieve the same technical purpose as the coating inside the reaction gas chamber 2, but can pass through a small light beam filter in the center to enter the center to reach the photosensitive sensor 6.
In order to facilitate the installation of the light source reflecting funnel 8, the end part of the reaction gas chamber 2 is provided with an annular groove body, the end part of the light source reflecting funnel 8 is provided with a convex edge 81, the convex edge 81 is arranged in the annular groove body, and the outer ring is provided with a sealing structure; the signal processing and feedback assembly 5 extrudes and fixes the convex edge 81 and the sealing structure in the annular groove body.
Wherein, signal processing and feedback subassembly 5 extrudees protruding edge 81 and seal structure through the double-deck plate body, and photosensitive sensor 6 centre gripping is between the double-deck plate body, and wherein, one deck plate body supplies photosensitive sensor 6's sense terminal to expose in reaction air chamber 2 through the hole site, and another deck plate body supplies photosensitive sensor 6's signal output part to draw forth through the hole site, and photosensitive sensor 6 is provided with seal structure around the hole site with one deck plate body at least.
The sealing structure ensures the sealing performance of the reaction gas chamber 2 on the side of the signal processing and feedback assembly 5.
The sealing structures in the invention preferably adopt sealing rings, and as a structure which is easier to purchase, the O-shaped sealing ring is more suitable for use.
Example two
As shown in fig. 14, a sulfur dioxide detecting system based on the ultraviolet fluorescence method includes: an ultraviolet light output unit which provides ultraviolet light of a specific wavelength; the sample gas to be detected enters and exits the closed space, and the sample gas absorbs ultraviolet light to release fluorescence in the closed space; a signal conversion unit converting a signal of the fluorescence into an electric signal; the two independent electric energy supply units are respectively connected with the ultraviolet light output unit and the signal conversion unit and supply power to the ultraviolet light output unit and the signal conversion unit; the control unit is respectively connected with the electric energy supply unit and the signal conversion unit, controls the output of the electric energy supply unit, and converts the electric signal into a detection result of sulfur dioxide; the device also comprises a detection unit which is connected with the control unit, the detection unit detects the intensity of the ultraviolet light, and the intensity detection result is used as the output basis of the electric energy supply unit.
The invention provides a sulfur dioxide detection system based on an ultraviolet fluorescence method, wherein ultraviolet light from an ultraviolet light output unit irradiates a sample gas in a closed space, sulfur dioxide molecules in the sample gas can release fluorescence with the wavelength of 220-420 nm after the sample gas containing sulfur dioxide absorbs the ultraviolet light with a specific wavelength, a control unit calculates the concentration of the sulfur dioxide in a sample device by detecting the intensity of the fluorescence, and the intensity of the fluorescence is obtained by evaluating a converted electric signal.
EXAMPLE III
As shown in fig. 15, a sulfur dioxide detection method based on the ultraviolet fluorescence method includes:
a1: converting the first part of electric energy into ultraviolet light with specific wavelength;
a2: irradiating the sample gas to be detected by ultraviolet light in the closed space, and absorbing the ultraviolet light by the sample gas to release fluorescence;
a3: converting the signal of the fluorescence into an electrical signal and providing a gain to the electrical signal by the second portion of the electrical energy supply;
a4: converting the electric signal into a detection result of sulfur dioxide;
a5: the intensity of the ultraviolet light is detected and the first portion of electrical energy and the second portion of electrical energy are adjusted based on the intensity.
In the second and third embodiments, the technical effects are the same as those in the first embodiment, and are not described herein again.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A sulfur dioxide detects structure based on ultraviolet fluorescence method, its characterized in that includes:
a light source assembly providing ultraviolet light of a specific wavelength;
the reaction gas chamber provides a closed space for the sample gas to be detected to enter and exit, and the sample gas absorbs the ultraviolet light to release fluorescence in the closed space;
a photomultiplier tube assembly that converts the signal of the fluorescence into an electrical signal;
the boosting circuit board is connected with the light source component and supplies power to the light source component;
the power supply is connected with the photomultiplier tube assembly and supplies power to the photomultiplier tube assembly;
the signal processing and feedback assembly is respectively connected with the booster circuit board, the power supply and the photomultiplier assembly, controls the output of the booster circuit board and the power supply, and converts the electric signal into a detection result of sulfur dioxide;
the light sensor is connected with the signal processing and feedback assembly and used for detecting the intensity of the ultraviolet light, and the intensity detection result is used as the output basis of the booster circuit board and the power supply;
the signal processing and feedback assembly adjusts the electric energy provided by the power supply to the photomultiplier tube assembly according to the intensity of the ultraviolet light, so that the electric signal obtains different gains, and the change of the detection result caused by the intensity change of the ultraviolet light is buffered.
2. The structure for detecting sulfur dioxide based on uv fluorescence method according to claim 1, wherein the light source assembly comprises:
the xenon lamp is connected with the power supply and provides 185-2000nm wavelength diffusion light under the supply of electric energy;
an extraction structure for extracting ultraviolet light with wavelength of 206-224nm from the scattered light;
the extraction structure comprises:
a sleeve for fixing the xenon lamp;
a first adjustment assembly for performing direction parallel adjustment of the astigmatism from the xenon lamp;
the light filtering component comprises a mounting seat and a plurality of reflectors, wherein the reflectors are fixedly connected with the mounting seat and enclose a closed light path space together with the mounting seat, and each reflector reflects ultraviolet light with the wavelength of 206-224nm and allows light outside the wavelength range to pass through.
3. The structure for detecting sulfur dioxide based on ultraviolet fluorescence method as claimed in claim 2, wherein said reflecting mirror comprises:
the connecting plate is fixedly connected with the mounting seat;
the base is connected with the connecting plate and inserted into the light path space, and a concave area is arranged on the base;
and the lens is arranged on the base, seals the concave area, reflects ultraviolet light with the wavelength of 206-224nm and allows light outside the wavelength range to enter the concave area.
4. The uv-fluorescence based sulfur dioxide detection structure of claim 2, wherein said light source assembly further comprises a second adjustment assembly, said second adjustment assembly comprising:
the light-transmitting seat is fixedly connected with the mounting seat, a through cavity is arranged in the light-transmitting seat, and at least one step surface is arranged on the inner wall of the through cavity;
the baffle is arranged between the mounting seat and the light-transmitting seat and is provided with a hole site with a specific shape, and the hole site is used for light rays from the mounting seat to pass through;
the convex lens is arranged in the through cavity, one side of the convex lens is blocked and limited through the step surface, and a sealing structure is arranged between the convex lens and the step surface;
and the compression ring is fixedly connected with the light-transmitting seat and is used for extruding the outer ring of the other side of the convex lens to realize the laminating of the convex lens and the step surface.
5. The structure for detecting sulfur dioxide based on ultraviolet fluorescence method of claim 1, further comprising a third adjusting component disposed between the reaction gas chamber and the photomultiplier tube component for passing the fluorescence, wherein the third adjusting component comprises: the lens comprises a first plano-convex lens, a second plano-convex lens, a filter and a dividing ring;
the first plano-convex lens and the second plano-convex lens are arranged in hole sites on the reaction gas chamber, the convex surfaces are arranged oppositely, the dividing ring is arranged between the first plano-convex lens and the second plano-convex lens, and a sealing structure is arranged between the dividing ring and at least one plano-convex lens;
the photomultiplier tube assembly extrudes and fixes the first plano-convex lens, the second plano-convex lens and the segmentation ring, and fixes the filter plate.
6. The sulfur dioxide detection structure based on ultraviolet fluorescence method of claim 1, further comprising a light source reflection funnel, wherein the light source reflection funnel is covered outside the photosensitive sensor.
7. The sulfur dioxide detection structure based on the ultraviolet fluorescence method as claimed in claim 6, wherein an annular groove body is arranged at the end of the reaction gas chamber, a convex edge is arranged at the end of the light source reflection funnel, the convex edge is arranged in the annular groove body, and a sealing structure is arranged on the outer ring;
the signal processing and feedback assembly extrudes and fixes the convex edge and the sealing structure in the annular groove body.
8. The sulfur dioxide detecting structure based on the ultraviolet fluorescence method as claimed in claim 7, wherein the signal processing and feedback assembly extrudes the convex edge and the sealing structure through a double-layer plate, the photosensitive sensor is clamped between the double-layer plate, wherein the detection end of the photosensitive sensor is exposed in the reaction gas chamber through a hole on one layer of plate, the signal output end of the photosensitive sensor is led out through a hole on the other layer of plate, and the sealing structure is arranged around the hole between the photosensitive sensor and at least one layer of plate.
9. A sulfur dioxide detecting system based on an ultraviolet fluorescence method is characterized by comprising:
an ultraviolet light output unit which provides ultraviolet light of a specific wavelength;
the sample gas to be detected enters and exits the closed space, and the sample gas absorbs the ultraviolet light to release fluorescence in the closed space;
a signal conversion unit converting the signal of the fluorescence into an electric signal;
the two independent electric energy supply units are respectively connected with the ultraviolet light output unit and the signal conversion unit and supply power to the ultraviolet light output unit and the signal conversion unit;
the control unit is respectively connected with the electric energy supply unit and the signal conversion unit, controls the output of the electric energy supply unit, and converts the electric signal into a detection result of sulfur dioxide;
the detection unit is connected with the control unit and is used for detecting the intensity of the ultraviolet light, and the intensity detection result is used as the output basis of the electric energy supply unit;
the control unit adjusts the electric energy provided by one of the electric energy supply units to the signal conversion unit according to the intensity of the ultraviolet light, so that the electric signals obtain different gains, and the change of the detection result caused by the intensity change of the ultraviolet light is buffered.
10. A sulfur dioxide detection method based on an ultraviolet fluorescence method is characterized by comprising the following steps:
converting the first part of electric energy into ultraviolet light with specific wavelength;
irradiating sample gas to be detected in the closed space through the ultraviolet light, wherein the sample gas absorbs the ultraviolet light to release fluorescence;
converting the signal of the fluorescence into an electrical signal and providing a gain to the electrical signal by a second portion of the electrical energy supply;
converting the electric signal into a detection result of sulfur dioxide;
detecting the intensity of the ultraviolet light, and adjusting the first part of electric energy and the second part of electric energy according to the intensity;
and adjusting the second part of electric energy according to the intensity of the ultraviolet light, so that the electric signal obtains different gains to buffer the change of the detection result caused by the change of the intensity of the ultraviolet light.
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