CN111141647A - Air dust monitoring method for environmental supervision - Google Patents
Air dust monitoring method for environmental supervision Download PDFInfo
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- CN111141647A CN111141647A CN201911419894.7A CN201911419894A CN111141647A CN 111141647 A CN111141647 A CN 111141647A CN 201911419894 A CN201911419894 A CN 201911419894A CN 111141647 A CN111141647 A CN 111141647A
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- 239000000428 dust Substances 0.000 title claims abstract description 117
- 238000012544 monitoring process Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000007613 environmental effect Effects 0.000 title claims abstract description 15
- 230000006698 induction Effects 0.000 claims abstract description 33
- 238000001035 drying Methods 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims description 51
- 238000010438 heat treatment Methods 0.000 claims description 20
- 230000003287 optical effect Effects 0.000 claims description 10
- 230000000694 effects Effects 0.000 abstract description 7
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 230000003068 static effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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Abstract
The invention discloses an air dust monitoring method for environmental supervision. This air dust monitoring method for environment supervision, inhale air and dry air through the drying device that induced drafts, thereby avoid steam to the influence of testing result, improve the temperature of air simultaneously and make air and dust more active, accelerate the flow speed of air under the effect of impeller and the exhaust fan induced drafts, thereby avoid the dust to adhere to on laser emitter and the laser induction board and influence follow-up testing result, and reduce clean number of times and prolong testing device's life, utilize the baffle simultaneously, dust collecting tank and static dust absorption board isotructure cooperate and detach the dust in the exhaust air, avoid the dust to return to external environment once more, this dust removal structure simple structure, high durability and convenient use and effect are better.
Description
Technical Field
The invention relates to an air dust monitoring method for environment supervision, in particular to the field of environment monitoring equipment.
Background
Dust, which refers to solid particles suspended in air, is one of the main causes for maintaining the earth's temperature in the atmosphere, and too much or too little dust in the atmosphere has a catastrophic effect on the environment, in life and work, however, productive dust is a natural enemy of human health, is a main cause for inducing various diseases, generally needs to monitor the dust concentration in the air for determining the environmental quality, generally adopts a laser detection mode for rapidly monitoring the dust concentration, but when the air humidity is high, the moisture in the air may affect the detection result, meanwhile, dust can stay on the surface of the detection instrument to influence the detection result and damage the detection mechanism, the detection instrument needs to be cleaned for a long time, and the existing monitoring device usually discharges the detected dust together with air, and a simple, convenient and effective dust removal mode is lacked.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an air dust monitoring method for environmental supervision.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention discloses an air dust monitoring method for environmental supervision, which comprises the following steps:
s1, arranging a detection box, wherein the top of the detection box is fixedly connected with an air duct, the top of the air duct is fixedly connected with an air inlet bin, the bottom surface of the air inlet bin is provided with uniformly distributed air ports, the interior of the air inlet bin is fixedly connected with an air suction drying device, and the interior of the detection box is fixedly connected with a detection exhaust device;
s2, the fixed disc is driven to rotate by the motor, the air suction impeller is driven to rotate in the air duct through the rotating shaft to suck air, so that air enters from the air opening and enters the detection box through the air duct, and meanwhile, the heating pipe rotates along with the fixed disc to fully dry the sucked air and raise the temperature of the air so as to activate the air and dust;
s3, enabling active air to flow rapidly under the action of an air suction impeller and an exhaust fan, pass through a laser emitter and a laser induction plate and avoid being attached to the surfaces of the laser emitter and the laser induction plate, enabling the laser emitter to emit laser, change the laser through air and dust and finally irradiate the laser induction plate, enabling the laser induction plate to sense optical signals, convert the optical signals into electric signals and transmit the electric signals to a signal processor, enabling the signal processor to analyze the signals and calculate dust concentration through the change of the laser, and enabling the signal processor to display results on a display screen;
s4, the air carrying dust is detected and then continuously moves to the exhaust barrel to pass through the baffle, the wind direction is changed rapidly under the action of the baffle, most dust cannot pass through the baffle due to inertia and falls into the dust collection groove along with the baffle, the air enters the exhaust barrel, the residual dust is sucked by the electrostatic dust collection plate, and the air is exhausted by the exhaust fan.
Preferably, the drying device induced drafts includes the motor, the fixed disk, the heating pipe, the pivot and the impeller that induced drafts, motor fixed connection is in the top in air inlet storehouse, the fixed disk passes through bearing fixed connection in the interior roof in air inlet storehouse, and the output of motor pass the roof in air inlet storehouse and with fixed disk fixed connection, the top of heating pipe and the bottom fixed connection of fixed disk, the top of pivot and the bottom fixed connection of fixed disk, the bottom fixedly connected with impeller that induced drafts of pivot, the motor drives the fixed disk and rotates, and it induced drafts to drive the impeller at the dryer internal rotation through the pivot, make the air get into and get into the detection case through the dryer by the wind gap, the heating pipe rotates and.
Preferably, the detection exhaust device comprises a laser emitter, a laser induction plate, a signal processor, a display screen, a baffle, a dust collecting groove, an exhaust duct, an electrostatic dust collection plate and an exhaust fan, wherein the laser emitter is fixedly connected to the inner bottom wall of the detection box, the laser induction plate is fixedly connected to the inner top wall of the detection box, the signal processor is positioned in the top wall of the detection box and fixedly connected with the laser induction plate, the display screen is fixedly connected to the upper surface of the detection box and fixedly connected with the signal processor, the two baffles are respectively and fixedly connected with the inner top wall and the inner bottom wall of the detection box, the dust collecting groove is arranged on the inner bottom wall of the detection box, the exhaust duct is fixedly connected to the right end of the exhaust duct, the electrostatic dust collection plate is fixedly connected to the inner wall of the exhaust duct, the exhaust fan is fixedly connected with the inner wall of the exhaust duct through a fan frame and positioned on the right side of the electrostatic dust collection plate, the laser emitter emits laser, changes through air and dust and finally irradiates, the laser induction board senses optical signals and converts the optical signals into electric signals to be transmitted to the signal processor, the signal processor analyzes the signals and obtains results and displays the results on the display screen, the detected air moves towards the exhaust cylinder under the action of the air suction impeller and the exhaust fan and passes through the baffle, the wind direction is changed rapidly under the action of the baffle, most of dust is made to fall into the dust collecting tank through the baffle due to inertia, the air enters the exhaust cylinder, the residual dust is sucked by the electrostatic dust suction board, and the air is discharged by the exhaust fan.
Preferably, the bottom ends of the heating pipe and the rotating shaft extend into the air duct, so that the air suction impeller rotates along with the rotating shaft in the air duct to achieve the air suction effect, and meanwhile, the heating pipe fully dries air.
Preferably, the rotating shaft is fixedly connected with the circle center of the fixed disk, the heating pipes are uniformly arranged around the rotating shaft, so that the rotating shaft and the fixed disk rotate by taking the same central axis as a rotating center, and meanwhile, the heating pipes rotate around the rotating shaft, so that uneven drying is avoided.
Preferably, laser emitter is located laser induction board under, and laser emitter's output point is perpendicular with laser induction board, makes the laser of laser emitter transmission pass the air and dust and just shoot to laser induction board, avoids the testing result to take place the deviation.
Preferably, the upper ends of the baffles are arranged to be inclined rightwards, the heights of the two baffles are 1/3 for detecting the height of the interior of the box, and most of dust is removed by the sharp change of the wind direction of the baffles.
Preferably, the opening end of the dust collecting groove is fixedly connected with the stop block on the inner wall on the left side of the dust collecting groove, the upper surface of the stop block is an inclined plane, the inner wall on the right side of the dust collecting groove and the bottom ends of the two baffle plates are positioned on the same horizontal plane, dust falls into the dust collecting groove along with the baffle plates, and the stop block is utilized to prevent flowing air from influencing the dust in the dust collecting groove.
The invention has the following beneficial effects:
1. this air dust monitoring method for environment supervision inhales air and dry air through the drying device that induced drafts to avoid steam to the influence of testing result, improve the temperature of air simultaneously and make air and dust more active, accelerate the mobile speed of air under the effect of impeller and the exhaust fan of induced drafting, thereby avoid the dust to adhere to on laser emitter and the laser induction board and influence follow-up testing result, and reduce clean number of times and prolong testing device's life.
2. According to the air dust monitoring method for environment supervision, air is discharged through the detection exhaust device, dust in the discharged air is removed by means of the matching of structures such as the baffle plate, the dust collecting groove and the electrostatic dust collection plate, the dust is prevented from returning to the external environment again, and the dust collection structure is simple in structure, convenient to use and good in effect.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view taken at A-A of FIG. 1;
FIG. 3 is a schematic diagram of the structure at B in FIG. 2;
fig. 4 is a schematic structural diagram of the present invention.
In the figure: 1. a detection box; 2. an air duct; 3. an air inlet bin; 4. a tuyere; 5. an air suction drying device; 501. a motor; 502. fixing the disc; 503. heating a tube; 504. a rotating shaft; 505. an air suction impeller; 6. detecting an exhaust device; 601. a laser transmitter; 602. a laser induction plate; 603. a signal processor; 604. a display screen; 605. a baffle plate; 606. a dust collecting groove; 607. an exhaust duct; 608. an electrostatic dust collection plate; 609. an exhaust fan.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
As shown in fig. 1 to 4, an airborne dust monitoring method for environmental supervision includes the following steps:
s1, arranging a detection box 1, wherein the top of the detection box 1 is fixedly connected with an air duct 2, the top of the air duct 2 is fixedly connected with an air inlet bin 3, the bottom surface of the air inlet bin 3 is provided with uniformly distributed air ports 4, the interior of the air inlet bin 3 is fixedly connected with an air suction drying device 5, and the interior of the detection box 1 is fixedly connected with a detection exhaust device 6;
the air suction drying device 5 comprises a motor 501, a fixed disk 502, a heating pipe 503, a rotating shaft 504 and an air suction impeller 505, wherein the motor 501 is fixedly connected to the top of the air inlet bin 3, the fixed disk 502 is fixedly connected to the inner top wall of the air inlet bin 3 through a bearing, the output end of the motor 501 penetrates through the top wall of the air inlet bin 3 and is fixedly connected with the fixed disk 502, the top end of the heating pipe 503 is fixedly connected with the bottom of the fixed disk 502, the top end of the rotating shaft 504 is fixedly connected with the bottom of the fixed disk 502, the rotating shaft 504 is fixedly connected with the center of the fixed disk 502, the heating pipes 503 are uniformly arranged around the rotating shaft 504, the bottom end of the rotating shaft 504 is fixedly connected with the air suction impeller 505, the heating pipe 503 and the bottom end of the rotating shaft 504 both extend into the air duct 2, the motor 501 drives the fixed disk 502 to rotate, and drives, meanwhile, the heating pipe 503 rotates along with the fixed disk 502 to fully dry the air and raise the temperature of the air, so that the air and the dust are activated, and the air is sucked and dried by the air suction drying device 5, thereby avoiding the influence of the water vapor on the detection result.
The detection exhaust device 6 comprises a laser emitter 601, a laser induction plate 602, a signal processor 603, a display screen 604, baffles 605, a dust collecting groove 606, an exhaust cylinder 607, an electrostatic dust collection plate 608 and an exhaust fan 609, wherein the laser emitter 601 is fixedly connected to the inner bottom wall of the detection box 1, the laser induction plate 602 is fixedly connected to the inner top wall of the detection box 1, the laser emitter 601 is positioned right below the laser induction plate 602, the output end of the laser emitter 601 points to be vertical to the laser induction plate 602, the signal processor 603 is positioned in the top wall of the detection box 1 and is fixedly connected with the laser induction plate 602, the display screen 604 is fixedly connected to the upper surface of the detection box 1, the display screen 604 is fixedly connected with the signal processor 603, two baffles 605 are fixedly connected with the inner top wall and the inner bottom wall of the detection box 1 respectively, the upper ends of the baffles 605 are arranged obliquely to the right, the heights of the two baffles 605 are 1/3 of the height of the inside of the detection box, the dust collecting groove 606 is arranged on the inner bottom wall of the detection box 1, the inner wall of the dust collecting groove 606 at the opening end and on the left side thereof is fixedly connected with a baffle, the upper surface of the baffle is an inclined plane, the inner wall of the dust collecting groove 606 on the right side is in the same horizontal plane with the bottom ends of the two baffles 605, dust falls into the dust collecting groove 606 along with the baffles 605 and avoids flowing air from influencing dust in the dust collecting groove 606 by the baffle, the exhaust cylinder 607 is fixedly connected with the right end of the exhaust cylinder 607, the electrostatic dust collection plate 608 is fixedly connected with the inner wall of the exhaust cylinder 607 through a fan frame and is positioned on the right side of the electrostatic dust collection plate 608, the laser emitter 601 emits laser, changes through air and dust and finally irradiates on the laser sensing plate 602, the laser sensing plate 602 senses optical signals and converts the optical signals into electrical signals to transmit to the signal processor 603, the signal processor 603 analyzes the signals to obtain results and displays the results on the display screen 604, the detected air moves to the exhaust cylinder 607 under the action of the suction impeller 505 and the exhaust fan 609 and passes through the baffle 605, the wind direction is changed sharply under the action of the baffle 605, most dust can not pass through the baffle 605 and fall into the dust collecting groove 606 along with the baffle 605 due to inertia, the air enters the exhaust cylinder 607, the residual dust is sucked by the electrostatic dust collection plate 608 and is exhausted by the exhaust fan 609, more active air and dust are generated, the flowing speed of the air is accelerated under the action of the suction impeller 505 and the exhaust fan 609, so that the dust is prevented from attaching to the laser emitter 601 and the laser induction plate 602 to influence the subsequent detection result, the cleaning times are reduced to prolong the service life of the detection device, the air is exhausted through the detection exhaust device 6, and the dust in the exhausted air is removed by the cooperation of the baffle 605, the dust collecting groove 606, the electrostatic dust collection plate 608 and the like, the dust is prevented from returning to the external environment again, and the dust removal structure is simple in structure, convenient to use and good in effect;
s2, the fixed disc 502 is driven to rotate by the motor 501, the air suction impeller 505 is driven to rotate in the air duct 2 by the rotating shaft 504 to suck air, so that air enters from the air opening 4 and enters the detection box 1 through the air duct 2, and meanwhile, the heating pipe 503 rotates along with the fixed disc 502 to fully dry the sucked air and raise the air temperature so as to activate air and dust;
s3, enabling active air to flow rapidly under the action of the air suction impeller 505 and the exhaust fan 609, enabling the active air to pass through the laser emitter 601 and the laser induction board 602 and avoid being attached to the surfaces of the laser emitter 601 and the laser induction board 602, enabling the laser emitter 601 to emit laser, change the laser through air and dust and finally irradiate the laser induction board 602, enabling the laser induction board 602 to sense optical signals, convert the optical signals into electric signals and transmit the electric signals to the signal processor 603, enabling the signal processor 603 to analyze the signals and calculate the dust concentration through the change of the laser, and enabling the signal processor 603 to display results on the display screen 604;
s4, the air carrying dust is detected and then continuously moves to the exhaust tube 607 to pass through the baffle 605, the wind direction is changed rapidly under the action of the baffle 605, most dust can not pass through the baffle 605 due to inertia and falls into the dust collection groove 606 along with the baffle 605, the air enters the exhaust tube 607, the residual dust is sucked by the electrostatic dust collection plate 608, and the air is exhausted by the exhaust fan 609.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. An air dust monitoring method for environmental supervision is characterized in that: the method comprises the following steps:
s1, arranging a detection box (1), wherein the top of the detection box (1) is fixedly connected with an air duct (2), the top of the air duct (2) is fixedly connected with an air inlet bin (3), the bottom surface of the air inlet bin (3) is provided with uniformly distributed air ports (4), the interior of the air inlet bin (3) is fixedly connected with an air suction drying device (5), and the interior of the detection box (1) is fixedly connected with a detection exhaust device (6);
s2, the fixed disc is driven to rotate by the motor, the air suction impeller is driven to rotate in the air duct through the rotating shaft to suck air, so that air enters from the air opening and enters the detection box through the air duct, and meanwhile, the heating pipe rotates along with the fixed disc to fully dry the sucked air and raise the temperature of the air so as to activate the air and dust;
s3, enabling active air to flow rapidly under the action of an air suction impeller and an exhaust fan, pass through a laser emitter and a laser induction plate and avoid being attached to the surfaces of the laser emitter and the laser induction plate, enabling the laser emitter to emit laser, change the laser through air and dust and finally irradiate the laser induction plate, enabling the laser induction plate to sense optical signals, convert the optical signals into electric signals and transmit the electric signals to a signal processor, enabling the signal processor to analyze the signals and calculate dust concentration through the change of the laser, and enabling the signal processor to display results on a display screen;
s4, the air carrying dust is detected and then continuously moves to the exhaust barrel to pass through the baffle, the wind direction is changed rapidly under the action of the baffle, most dust cannot pass through the baffle due to inertia and falls into the dust collection groove along with the baffle, the air enters the exhaust barrel, the residual dust is sucked by the electrostatic dust collection plate, and the air is exhausted by the exhaust fan.
2. The method for monitoring airborne dust for environmental supervision according to claim 1, characterized in that: induced draft drying device (5) include motor (501), fixed disk (502), heating pipe (503), pivot (504) and impeller (505) induced draft, motor (501) fixed connection is in the top of air inlet storehouse (3), fixed disk (502) pass through bearing fixed connection in the interior roof of air inlet storehouse (3), and the output of motor (501) pass the roof of air inlet storehouse (3) and with fixed disk (502) fixed connection, the top of heating pipe (503) and the bottom fixed connection of fixed disk (502), the top of pivot (504) and the bottom fixed connection of fixed disk (502), the bottom fixedly connected with impeller (505) of induced draft of pivot (504).
3. The method for monitoring airborne dust for environmental supervision according to claim 1, characterized in that: the detection exhaust device (6) comprises a laser emitter (601), a laser induction plate (602), a signal processor (603), a display screen (604), a baffle (605), a dust collection groove (606), an exhaust cylinder (607), an electrostatic dust collection plate (608) and an exhaust fan (609), wherein the laser emitter (601) is fixedly connected with the inner bottom wall of the detection box (1), the laser induction plate (602) is fixedly connected with the inner top wall of the detection box (1), the signal processor (603) is positioned in the top wall of the detection box (1) and is fixedly connected with the laser induction plate (602), the display screen (604) is fixedly connected with the upper surface of the detection box (1), the display screen (604) is fixedly connected with the signal processor (603), the baffles (605) are two in number and are respectively fixedly connected with the inner top wall and the inner bottom wall of the detection box (1), the dust collection groove (606) is arranged on the inner bottom wall of the detection box (1), the exhaust barrel (607) is fixedly connected with the right end of the exhaust barrel (607), the electrostatic dust collection plate (608) is fixedly connected with the inner wall of the exhaust barrel (607), and the exhaust fan (609) is fixedly connected with the inner wall of the exhaust barrel (607) through a fan frame and is positioned on the right side of the electrostatic dust collection plate (608).
4. The method for monitoring airborne dust for environmental supervision according to claim 2, characterized in that: the bottom ends of the heating pipe (503) and the rotating shaft (504) both extend into the air duct (2).
5. The method for monitoring airborne dust for environmental supervision according to claim 2, characterized in that: the rotating shaft (504) is fixedly connected with the circle center of the fixed disc (502), and the heating pipes (503) are uniformly arranged around the rotating shaft (504).
6. The method for monitoring airborne dust for environmental supervision according to claim 3, wherein: the laser emitter (601) is located under the laser induction plate (602), and the output end of the laser emitter (601) points to be perpendicular to the laser induction plate (602).
7. The method for monitoring airborne dust for environmental supervision according to claim 3, wherein: the upper ends of the baffles (605) are arranged in a rightward inclined mode, and the heights of the two baffles (605) are 1/3 of the height inside the detection box (1).
8. The method for monitoring airborne dust for environmental supervision according to claim 3, wherein: the inner wall of the opening end of the dust collecting groove (606) and the inner wall of the left side of the dust collecting groove are fixedly connected with a stop block, the upper surface of the stop block is an inclined plane, and the inner wall of the right side of the dust collecting groove (606) and the bottom ends of the two baffle plates (605) are positioned on the same horizontal plane.
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| CN201911419894.7A CN111141647A (en) | 2019-12-31 | 2019-12-31 | Air dust monitoring method for environmental supervision |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113188963A (en) * | 2021-04-29 | 2021-07-30 | 广州高铁计量检测股份有限公司 | Dust particle detector |
| CN113433046A (en) * | 2021-06-23 | 2021-09-24 | 江苏铁军软件科技有限公司 | Raise dust detecting system for job site |
| CN114018778A (en) * | 2021-11-16 | 2022-02-08 | 丁先喜 | Portable supervision detection device |
| CN114486653A (en) * | 2021-11-25 | 2022-05-13 | 江苏吉华电子科技有限公司 | High accuracy raise dust monitoring devices with heating dehumidification function |
| CN115283363A (en) * | 2022-07-01 | 2022-11-04 | 江苏吉华电子科技有限公司 | Beta-ray atmospheric particulate monitoring equipment with dust cleaning function |
| CN116465858A (en) * | 2023-05-05 | 2023-07-21 | 商丘师范学院 | PM2.5 concentration detection device |
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