CN110567853A - Mine dust measurement system based on image - Google Patents
Mine dust measurement system based on image Download PDFInfo
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- CN110567853A CN110567853A CN201911008542.2A CN201911008542A CN110567853A CN 110567853 A CN110567853 A CN 110567853A CN 201911008542 A CN201911008542 A CN 201911008542A CN 110567853 A CN110567853 A CN 110567853A
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- 239000000428 dust Substances 0.000 title claims abstract description 115
- 238000005259 measurement Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 claims abstract description 69
- 238000004140 cleaning Methods 0.000 claims abstract description 31
- 230000035945 sensitivity Effects 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims description 57
- 230000005540 biological transmission Effects 0.000 claims description 17
- 238000007664 blowing Methods 0.000 claims description 4
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000012935 Averaging Methods 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 10
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 238000000149 argon plasma sintering Methods 0.000 description 3
- 230000031700 light absorption Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000005250 beta ray Effects 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 206010035653 pneumoconiosis Diseases 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
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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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- G01N15/075—
Abstract
The invention provides an image-based mine dust measurement system, which mainly comprises a light source, image acquisition equipment and control equipment, wherein an open air chamber is adopted, an air suction pump and dust treatment equipment are not needed, the image acquisition equipment acquires light source images and directly completes dust detection through image processing, and the system is simple in structure and convenient to install and maintain; the invention also provides a method for automatically cleaning the lens cover and the light source cover, a method for removing dust between the image acquisition equipment and the light source, a system zero setting method, a system sensitivity calibration method and the like, so that the accuracy of system monitoring data is further ensured, the method is particularly suitable for underground dusty environments, and the method has wide application space.
Description
Technical Field
The invention relates to a mine dust measurement system based on images, which relates to the fields of digital image processing technology, automatic control technology, data processing technology and the like.
background
Coal is the main energy source in China and accounts for about 70% of primary energy. The coal industry is a high-risk industry, accidents such as gas, flood, fire, a roof, coal dust and the like disturb coal mine safety production, and coal dust explosion accidents are large in damage and high in personnel death, so that mine dust monitoring is an important guarantee for coal mine safety production and is also an important measure for preventing and treating pneumoconiosis. The current mine dust monitoring technology mainly comprises: tribostatic method, light scattering method, light absorption method, capacitance method, beta-ray method, ultrasonic method, microwave method. The capacitance method has a simple measurement principle, but the capacitance measurement value and the concentration are not in a one-to-one linear relationship, and the capacitance measurement value is easily influenced by phase distribution and flow pattern change, so that a larger measurement error is caused. Although the beta-ray method is accurate in measurement, the dust needs to be sampled and then measured in a contrast manner, and the online monitoring of the dust concentration is difficult to realize. The dust concentration measurement by the ultrasonic method and the microwave method is still in the experimental research stage, and the molded products in the market are few. At present, the online monitoring of the dust concentration is mainly carried out by adopting a light scattering method, a light absorption method and a triboelectric method in the market. The light scattering method and the light absorption method need to collect dust-containing air through an air pump, treat dust particles in the air and then fill the dust particles into a closed air chamber, and detection is carried out in the air chamber, so that the equipment structure is complex, and the use and maintenance cost is high. The triboelectric method is greatly affected by wind speed. In order to ensure accurate and reliable monitoring of mine dust, a new mine dust monitoring technology which is simple in structure, low in use and maintenance cost and accurate in detection is needed.
Disclosure of Invention
with the improvement of digital image processing technology, the image-based data processing technology is greatly developed, and on the basis, the invention provides an image-based mine dust measurement system suitable for wide popularization, wherein the system comprises a light source, image acquisition equipment and control equipment; arranging a light source and image acquisition equipment on two side walls of a mine roadway respectively, wherein the light source illuminates the image acquisition equipment; the control equipment controls the light source to emit light and the image acquisition equipment to acquire a light source image, processes the image and measures dust according to the brightness of the light source in the image; the light source comprises red, green and blue light emitting elements which can be controlled to emit light independently or simultaneously; the image acquisition equipment comprises a transparent lens cover, the light source comprises a transparent light source cover, and the lens cover and the light source cover are cleaned by automatic control or manual control of the control equipment at set intervals; the dust measuring process of the system comprises the following steps:
(1) measuring the distance between the light source and the image acquisition equipment;
(2) closing the automatic white balance function of the image acquisition equipment, and fixing the focal length and the aperture;
(3) The system is zeroed manually or automatically;
(4) Manually or automatically calibrating the sensitivity of the system;
(5) The control equipment controls the light source to emit light, and simultaneously controls the image acquisition equipment to acquire an image containing the light source; determining whether interference exists in an optical transmission path, namely an optical path, for acquiring a light source image by image acquisition equipment, if the interference exists in the optical path, repeatedly executing image acquisition and optical path interference determination, and if no interference exists in the optical path, executing the step (6);
(6) measuring the dust concentration according to the brightness value of the light source in the image;
(7) and (5) repeating the steps (5) and (6) to carry out image acquisition, optical path interference measurement and dust concentration measurement, and returning to execute the step (1) and the following steps when the running time of the system reaches the set interval time.
1. The method for zeroing the system by the mine dust measurement system comprises the following specific steps,
(1) Cleaning the lens cover and the light source cover;
(2) removing dust between the image acquisition equipment and the light source by adopting high-pressure dust-free gas;
(3) The control device controls the light source to emit light, controls the image acquisition device to acquire an image containing the light source, processes the image to obtain the brightness value of each monochromatic light source in the image, determines whether interference exists in an optical transmission path, namely an optical path, of the image of the light source acquired by the image acquisition device, and repeatedly executes image acquisition and optical path interference determination if the interference exists in the optical transmission path, and executes the step (4) if the interference does not exist in the optical path determination;
(4) and (4) recording the brightness value of each monochromatic light source in the image obtained in the step (3) as the brightness value of the light source in a dust-free state, and completing the zero setting of the equipment.
2. The method for calibrating the sensitivity of the mine dust measurement system to the system comprises the following specific steps:
(1) Simulating the light path environment of the dust concentration of the set value, wherein a shading sheet is arranged between a lens and a light source, or spraying a mixture of dust and air with standard dust concentration;
(2) the control device controls the light source to emit light, controls the image acquisition device to acquire an image containing the light source, processes the image to obtain the brightness value of each monochromatic light source in the image, determines whether interference exists in an optical transmission path, namely an optical path, of the image of the light source acquired by the image acquisition device, and repeatedly executes image acquisition and optical path interference determination if the interference exists in the optical transmission path, and executes the step (3) if the interference does not exist in the optical path determination;
(3) Recording the brightness value of each monochromatic light source in the image obtained in the step (2) as the brightness value of the light source in the state of the set value dust concentration;
(4) replacing the light path environment with different dust concentration set values, and repeating the step (2) and the step (3) to obtain a dust set value and a data table corresponding to the brightness values of the single-color light sources under the set value; when a light path environment is simulated by adopting the shading sheet, the brightness value of each monochromatic light source needs to be corrected according to the distance between the light source and the image acquisition equipment;
(5) Processing the data table corresponding to the brightness value of the light source obtained in the step (4) and the zero-setting data obtained in the step (3) in the claim 1, and fitting to obtain the brightness value x of each monochromatic light source by taking the dust set value as a dependent variableR、xG、xBformula y as a function of the argumentR＝fR(xR)、yG＝fG(xG)、yB＝fB(xB) As a dust measurement formula of the system.
further, when the method is used specifically, the brightness value x of each monochromatic light source is setR、xG、xBsubstituting into formula yR＝fR(xR)、yG＝fG(xG)、yB＝fB(xB) To obtain yR、yG、yBAveragingThe value of y was taken as the dust concentration value.
In a further embodiment, the method for simulating the optical path environment of the set value dust concentration includes disposing a light-shielding sheet for simulating the set value dust concentration between the lens and the light source, wherein a light-shielding coefficient of the light-shielding sheet is determined under a laboratory closed environment and a measurement distance is set.
3. In a further embodiment, the mine dust measurement system according to the present application determines whether there is interference in the light path by:
(1) The control device controls the red light-emitting element to emit light; meanwhile, the control device controls the image acquisition device to acquire an image containing a light source, processes the image and respectively obtains the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB(ii) a When in useOrExceeds a fixed threshold KRIf so, determining that the interference exists in the optical path, and ending the optical path interference determination; otherwise, continuing to execute the step (2);
(2) The control device controls the green light emitting element to emit light; meanwhile, the control device controls the image acquisition device to acquire an image containing a light source, processes the image and respectively obtains the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB(ii) a When in useOrExceeds a set threshold KGIf so, the interference exists in the measured light path, and the light path measurement is finished; otherwise, continuing to execute the step (3);
(3) The control device controls the blue light emitting element to emit light; meanwhile, the control device controls the image acquisition device to acquire an image containing a light source, processes the image and respectively obtains the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB(ii) a When in useorExceeds a set threshold KBIf the light path is not interfered, the light path is stoppedDetermining the way;
Said KR、KG、KBObtained by measurement setting or artificial setting.
4. in a further embodiment, the mine dust measurement system according to the present application, the optical path is measured by
determination of the presence or absence of interference:
(1) the control device controls the red light-emitting element to emit light; meanwhile, the control device controls the image acquisition device to acquire an image containing a light source, processes the image and respectively obtains the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB(ii) a When L isR-LGOr LR-LBLess than a set threshold FRIf so, the interference exists in the measured light path, and the light path measurement is finished; otherwise, continuing to execute the step (2);
(2) The control device controls the green light emitting element to emit light; meanwhile, the control device controls the image acquisition device to acquire an image containing a light source, processes the image and respectively obtains the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB(ii) a When L isG-LRor LG-LBLess than a set threshold FGif so, the interference exists in the measured light path, and the light path measurement is finished; otherwise, continuing to execute the step (3);
(3) The control device controls the blue light emitting element to emit light; meanwhile, the control device controls the image acquisition device to acquire an image containing a light source, processes the image and respectively obtains the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB(ii) a When L isB-LROr LB-LGLess than a set threshold FBIf the interference exists in the measured light path, otherwise, the measured light path is not interfered, and the light path measurement is ended;
Said FR、FG、FBObtained by measurement setting or artificial setting.
5. The mine dust measurement system further comprises: the method for removing dust between the image pickup device and the light source includes releasing air with a high-pressure air bottle, and blowing air along a light transmission path between the image pickup device and the light source through a high-pressure air nozzle.
6. The mine dust measurement system further comprises: the method for removing dust between the image acquisition equipment and the light source comprises the steps of using a mine compressed air system as a gas source, and blowing air along a light transmission path between the image acquisition equipment and the light source through a high-pressure air nozzle.
7. the mine dust measurement system further comprises: the method for cleaning the lens cover and the light source cover comprises the step of cleaning through cleaning liquid and an automatic cleaning brush, an automatic ultrasonic cleaning device, a high-pressure water device or a high-pressure air device.
8. The mine dust measurement system further comprises a humidity sensor, and the control equipment corrects the detected dust concentration according to the humidity value.
9. The mine dust measurement system further comprises: methods of measuring the distance between the light source and the image capture device include manual ranging or automatic ranging by a laser rangefinder.
the invention achieves the following beneficial effects: the mine dust measurement adopts an open air chamber, does not need an air pump and dust processing equipment, directly completes dust detection through image processing, and has simple system structure and convenient installation and maintenance; the invention also provides a method for automatically cleaning the lens cover and the light source cover, a method for removing dust between the image acquisition equipment and the light source, a system zero setting method, a system sensitivity calibration method and the like, so that the accuracy of system monitoring data is further ensured, the method is particularly suitable for underground dusty environments, and the method has wide application space.
drawings
fig. 1 is a schematic diagram of an example architecture for an image-based mine dust measurement system implementation.
fig. 2 is a flow chart of the operation of the image-based mine dust measurement system.
Fig. 3 is a workflow diagram of image-based zeroing of a mine dust measurement system.
FIG. 4 is a workflow diagram of image-based sensitivity calibration of a mine dust measurement system.
fig. 5 is a workflow diagram of an embodiment 1 of an image-based mine dust measurement system determining whether there is interference in the light path.
fig. 6 is a workflow diagram of example 2 implemented by an image-based mine dust measurement system to determine whether there is interference in the light path.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
An embodiment of the mine dust measurement system is shown in fig. 1, and the system comprises:
1. controller (101), be the core control and the data processing equipment of system, be responsible for the light source, the camera, light source cover cleaning equipment, lens cap cleaning equipment, light path cleaning equipment, dust concentration analog device controls, gather humidity transducer's humidity data and the video image data of camera and handle, realize dust monitoring, light source cover and lens cap wash, light path clearance zero set, work such as sensitivity mark, still be responsible for and aboveground equipment communication, with dust monitoring data transmission to aboveground equipment, receive the control command that aboveground equipment sent. The controller is provided with a wireless or wired communication interface and is used for collecting relevant data required by manual ranging, zeroing and sensitivity calibration of the system. The controller has a display screen and buttons for data and operating status display.
2. And the humidity sensor (102) is connected with the controller through a communication cable and provides humidity data for the controller.
3. The light source (103), which includes red, green and blue light emitting elements, can be controlled to emit light independently or simultaneously, and can be an RGB full color LED. With a light source cover.
4. the light source cover cleaning device (104) is used for cleaning the light source cover, and can be cleaned by adopting a cleaning solution and an automatic cleaning brush, an automatic ultrasonic cleaning device, a high-pressure water device or a high-pressure air device. The light source cover cleaning equipment is connected with the controller through a communication cable and controlled by the controller to work.
5. The lens hood cleaning device (105), a device for cleaning the lens hood of the camera, is the same principle as the light source hood cleaning device (104), and can be cleaned by a cleaning liquid and an automatic cleaning brush, an automatic ultrasonic cleaning device, a high-pressure water device or a high-pressure air device. The light source cover cleaning equipment is connected with the controller through a communication cable and controlled by the controller to work.
6. the camera (106), i.e. the image acquisition device, is a colour camera with a lens cover.
7. and a dust concentration simulation device (107) for simulating an optical path environment for setting the dust concentration, and the present example adopts a device which can be controlled by a control device to place a light shielding sheet in front of the lens of the camera.
8. and the light path cleaning equipment (108) is used for cleaning dust on a light transmission path between the light source and the camera when the system is adjusted to zero, can adopt a high-pressure air bottle as an air source, blast air along the light transmission path through a high-pressure air nozzle, and also can adopt a mine compressed air system as the air source. In this example, a high pressure air bottle is used as the air source. The light path cleaning equipment is connected with the controller through a communication cable, is controlled by the controller and controls the air valve switch to work.
9. a high pressure air bottle (109), in this example as the air supply for the optical path cleaning apparatus.
An example of the working flow of the mine dust measurement system is shown in fig. 2:
(201) manually measuring distance or automatically measuring the distance between the light source and the image acquisition equipment by a laser distance measuring instrument, and acquiring distance data by a controller;
(202) closing the automatic white balance function of the image acquisition equipment, fixing the focal length and the aperture, and locking the parameters of the camera;
(203) manually or automatically zeroing the system, if manual zeroing is adopted, a handheld device is needed to send control signal data required by zeroing to a controller;
(204) Manually or automatically calibrating the sensitivity of the system, if manual sensitivity calibration is adopted, a handheld device is needed to send control signal data required by sensitivity calibration to a controller;
(205) The control equipment controls the single-color light sources to emit light, and simultaneously controls the image acquisition equipment to acquire images containing the light sources;
(206) determining whether the optical path has interference, if so, returning to (205) to repeatedly execute image acquisition and optical path interference determination, and if not, executing step (207);
(207) Measuring the dust concentration according to the brightness value of each monochromatic light source in the image;
(208) judging whether the system running time reaches the set interval time, if the system running time reaches the set interval time, returning to (201) to restart the distance measurement and the following steps; otherwise, returning to (205) to carry out image acquisition, optical path interference determination and dust concentration measurement.
An embodiment of the zero setting workflow of the mine dust measurement system is shown in fig. 3:
(301) Manually or automatically cleaning the lens cover and the light source cover;
(302) Manually or automatically removing dust between the image acquisition equipment and the light source by adopting high-pressure dust-free gas;
(303) the control device controls the light source to emit light;
(304) meanwhile, the control equipment controls the image acquisition equipment to acquire an image containing the light source;
(305) Processing the image to obtain the brightness value of each monochromatic light source in the image;
(306) determining whether the optical path has interference, if so, returning to (303) to repeatedly execute the light source to emit light and the following steps, and if not, executing the step (307);
(307) And (2) recording the brightness value of each monochromatic light source in the image obtained in the step (305) as the brightness value of the light source in a dust-free state, and completing the zero setting of the equipment.
an embodiment of the sensitivity calibration workflow of the mine dust measurement system is shown in fig. 4:
(401) Simulating the light path environment of the dust concentration of the set value, wherein a shading sheet is arranged between a lens and a light source, or spraying a mixture of dust and air with standard dust concentration;
(402) the control device controls the light source to emit light;
(403) the control equipment controls the image acquisition equipment to acquire an image containing the light source;
(404) Processing the image to obtain the brightness value of each monochromatic light source in the image;
(405) Determining whether the optical path has interference, if so, returning to (402), and if not, executing the step (406);
(406) Recording the brightness value of each monochromatic light source in the image obtained in the step (404) as the brightness value of the light source in the state of setting the dust concentration;
(407) Judging whether recording of brightness values of all the dust concentration light sources required by system sensitivity is finished, if so, executing (409), otherwise, executing (408) and returning (402);
(408) replacing light path environments with different dust concentration set values;
(409) Obtaining a dust set value and a data table corresponding to the brightness value of each monochromatic light source under the set value according to the brightness values of all the dust concentration light sources; when a light path environment is simulated by adopting the shading sheet, the brightness value of each monochromatic light source needs to be corrected according to the distance data between the light source and the image acquisition equipment;
(410) Processing the light source brightness value corresponding data table and the zero setting data obtained in the step (409), and fitting to obtain the brightness value x of each monochromatic light source by taking the dust set value as a dependent variableR、xG、xBFormula y as a function of the argumentR＝fR(xR)、yG＝fG(xG)、yB＝fB(xB) As a dust measurement formula of the system.
In specific use, the brightness value x of each monochromatic light source is adjustedR、xG、xBSubstituting into formula yR＝fR(xR)、yG＝fG(xG)、yB＝fB(xB) To obtain yR、yG、yBAveragingthe value of y was taken as the dust concentration value.
the flow of the embodiment 1 of the mine dust measurement system for determining whether the optical path is interfered is shown in fig. 5, and the threshold value K in the determination processR、KG、KBobtained by measurement setting or artificial setting.
(501) The control device controls the red light-emitting element to emit light;
(502) The control equipment controls the image acquisition equipment to acquire an image containing the light source;
(503) The image is processed to obtain the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB；
(504) mixing L withG、LBAre respectively connected with LRPerforming a ratio operation whenOrexceeds a fixed threshold KRthen (513) is executed; otherwise, executing step (505);
(505) The control device controls the green light emitting element to emit light;
(506) The control equipment controls the image acquisition equipment to acquire an image containing the light source;
(507) The image is processed to obtain the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB；
(508) Mixing L withR、LBare respectively connected with LGperforming a ratio operation whenorExceeds a set threshold KGThen (513) is executed; otherwise, executing step (509);
(509) The control device controls the blue light emitting element to emit light;
(510) The control equipment controls the image acquisition equipment to acquire an image containing the light source;
(511) The image is processed to obtain the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB；
(512) mixing L withR、LGAre respectively connected with LBPerforming a ratio operation whenorExceeds a set threshold KBIf yes, executing (513), otherwise, executing (514);
(513) judging that optical path interference exists;
(514) And judging that no optical path interference exists.
The flow of the embodiment 2 of the mine dust measurement system for determining whether the optical path is interfered is shown in fig. 6, and the threshold value F in the determination processR、FG、FBObtained by measurement setting or artificial setting.
(601) The control device controls the red light-emitting element to emit light;
(602) the control equipment controls the image acquisition equipment to acquire an image containing the light source;
(603) the image is processed to obtain the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB；
(604) Mixing L withRAre respectively connected with LG、LBperforming a difference operation when LR-LGor LR-LBless than a set threshold FRThen (613) is executed; otherwise, executing step (605);
(605) the control device controls the green light emitting element to emit light;
(606) The control equipment controls the image acquisition equipment to acquire an image containing the light source;
(607) The image is processed to obtain the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB；
(608) Mixing L withGAre respectively connected with LR、LBPerforming a difference operation, LG-LROr LG-LBLess than a set threshold FGthen (613) is executed; otherwise, executing step (609);
(609) The control device controls the blue light emitting element to emit light;
(610) The control equipment controls the image acquisition equipment to acquire an image containing the light source;
(611) The image is processed to obtain the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB；
(612) mixing L withBare respectively connected with LR、LGperforming a difference operation when LB-LRor LB-LGLess than a set threshold FBThen execute
(613) otherwise, executing step (614);
(613) Judging that optical path interference exists;
(614) And judging that no optical path interference exists.
Claims (12)
1. Mine dust measurement system based on image, its characterized in that: the system comprises a light source, image acquisition equipment and control equipment; arranging a light source and image acquisition equipment on two side walls of a mine roadway respectively, wherein the light source illuminates the image acquisition equipment; the control equipment controls the light source to emit light and the image acquisition equipment to acquire a light source image, processes the image and measures dust according to the brightness of the light source in the image; the light source comprises red, green and blue light emitting elements which can be controlled to emit light independently or simultaneously; the image acquisition equipment comprises a transparent lens cover, the light source comprises a transparent light source cover, and the lens cover and the light source cover are cleaned by automatic control or manual control of the control equipment at set intervals; the dust measuring process of the system comprises the following steps:
(1) Measuring the distance between the light source and the image acquisition equipment;
(2) Closing the automatic white balance function of the image acquisition equipment, and fixing the focal length and the aperture;
(3) The system is zeroed manually or automatically;
(4) Manually or automatically calibrating the sensitivity of the system;
(5) The control equipment controls the light source to emit light, and simultaneously controls the image acquisition equipment to acquire an image containing the light source; determining whether interference exists in an optical transmission path, namely an optical path, for acquiring a light source image by image acquisition equipment, if the interference exists in the optical path, repeatedly executing image acquisition and optical path interference determination, and if no interference exists in the optical path, executing the step (6);
(6) measuring the dust concentration according to the brightness value of the light source in the image;
(7) And (5) repeating the steps (5) and (6) to carry out image acquisition, optical path interference measurement and dust concentration measurement, and returning to execute the step (1) and the following steps when the running time of the system reaches the set interval time.
2. The dust measurement system of claim 1, wherein: the method for zeroing a system according to step (3) of claim 1 is embodied as,
(1) Cleaning the lens cover and the light source cover;
(2) Removing dust between the image acquisition equipment and the light source by adopting high-pressure dust-free gas;
(3) The control device controls the light source to emit light, controls the image acquisition device to acquire an image containing the light source, processes the image to obtain the brightness value of each monochromatic light source in the image, determines whether interference exists in an optical transmission path, namely an optical path, of the image of the light source acquired by the image acquisition device, and repeatedly executes image acquisition and optical path interference determination if the interference exists in the optical transmission path, and executes the step (4) if the interference does not exist in the optical path determination;
(4) And (4) recording the brightness value of each monochromatic light source in the image obtained in the step (3) as the brightness value of the light source in a dust-free state, and completing the zero setting of the equipment.
3. The dust measurement system of claim 1, wherein: the method for calibrating the sensitivity of the system in the step (4) of claim 1 specifically comprises the following steps:
(1) simulating the light path environment of the dust concentration of the set value, wherein a shading sheet is arranged between a lens and a light source, or spraying a mixture of dust and air with standard dust concentration;
(2) The control device controls the light source to emit light, controls the image acquisition device to acquire an image containing the light source, processes the image to obtain the brightness value of each monochromatic light source in the image, determines whether interference exists in an optical transmission path, namely an optical path, of the image of the light source acquired by the image acquisition device, and repeatedly executes image acquisition and optical path interference determination if the interference exists in the optical transmission path, and executes the step (3) if the interference does not exist in the optical path determination;
(3) Recording the brightness value of each monochromatic light source in the image obtained in the step (2) as the brightness value of the light source in the state of the set value dust concentration;
(4) replacing the light path environment with different dust concentration set values, and repeating the step (2) and the step (3) to obtain a dust set value and a data table corresponding to the brightness values of the single-color light sources under the set value; when a light path environment is simulated by adopting a light shielding sheet, correcting the brightness value of each monochromatic light source according to the distance data obtained in the step (1) of claim 1;
(5) processing the data table corresponding to the brightness value of the light source obtained in the step (4) and the zero-setting data obtained in the step (3) in the claim 1, and fitting to obtain the brightness value x of each monochromatic light source by taking the dust set value as a dependent variableR、xG、xBformula y as a function of the argumentR＝fR(xR)、yG＝fG(xG)、yB＝fB(xB) As a dust measurement formula of the system.
4. a dust measurement system as claimed in claim 1, claim 2 and claim 3, wherein: the method for determining whether there is interference in the optical path according to the step (5) of claim 1, the step (3) of claim 2 and the step (2) of claim 3 comprises:
(1) The control device controls the red light-emitting element to emit light; meanwhile, the control device controls the image acquisition device to acquire an image containing a light source, processes the image and respectively obtains the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB(ii) a When in useorExceeds a fixed threshold KRIf so, determining that the interference exists in the optical path, and ending the optical path interference determination; otherwise, continuing to execute the step (2);
(2) The control device controls the green light emitting element to emit light; meanwhile, the control device controls the image acquisition device to acquire an image containing a light source, processes the image and respectively obtains the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB(ii) a When in useOrExceeds a set threshold KGIf so, the interference exists in the measured light path, and the light path measurement is finished; otherwise, continuing to execute the step (3);
(3) the control device controls the blue light emitting element to emit light; meanwhile, the control device controls the image acquisition device to acquire an image containing a light source, processes the image and respectively obtains the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB(ii) a When in useOrExceeds a set threshold KBIf the interference exists in the measured light path, otherwise, the measured light path is not interfered, and the light path measurement is ended;
Said KR、KG、KBObtained by measurement setting or artificial setting.
5. A dust measurement system as claimed in claim 1, claim 2 and claim 3, wherein: the method for determining whether there is interference in the optical path according to the steps (5) of claim 1, steps (3) of claim 2 and steps (2) of claim 3 comprises:
(1) the control device controls the red light-emitting element to emit light; meanwhile, the control device controls the image acquisition device to acquire an image containing a light source, processes the image and respectively obtains the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB(ii) a When L isR-LGOr LR-LBless than a set threshold FRIf so, the interference exists in the measured light path, and the light path measurement is finished; otherwise, continuing to execute the step (2);
(2) the control device controls the green light emitting element to emit light; meanwhile, the control device controls the image acquisition device to acquire an image containing a light source, processes the image and respectively obtains the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB(ii) a When L isG-LRor LG-LBLess than a set threshold FGIf so, the interference exists in the measured light path, and the light path measurement is finished; otherwise, continuing to execute the step (3);
(3) the control device controls the blue light emitting element to emit light; meanwhile, the control device controls the image acquisition device to acquire an image containing a light source, processes the image and respectively obtains the luminance value L of R, G, B of the light source region in the RGB imageR、LG、LB(ii) a When L isB-LROr LB-LGLess than a set threshold FBIf there is interference in the measuring light path, otherwise the measuring light path is not interfered, anEnding the optical path measurement;
Said FR、FG、FBobtained by measurement setting or artificial setting.
6. The dust measurement system of claim 1, wherein: the method of claim 1, step (6), for detecting the dust concentration, comprises the step of comparing the brightness value x of each monochromatic light sourceR、xG、xBsubstituting the formula y obtained in step (5) of claim 3R＝fR(xR)、yG＝fG(xG)、yB＝fB(xB) To obtain yR、yG、yBaveragingthe value of y was taken as the dust concentration value.
7. The dust measurement system of claim 1, wherein: the method of simulating an optical path environment of a set value dust concentration according to claim 3, step (1), comprising providing a light-shielding sheet for simulating the set value dust concentration between the lens and the light source, the light-shielding coefficient of the light-shielding sheet being measured in a closed laboratory environment under the condition of setting the measurement distance.
8. The dust measurement system of claim 2, wherein: the method of claim 2, step (2) of removing dust between the image pickup device and the light source, comprising discharging air with a high-pressure air bottle, and blowing air along the optical transmission path between the image pickup device and the light source through a high-pressure air nozzle.
9. the dust measurement system of claim 2, wherein: the method of claim 2, step (2) of removing dust between the image pickup device and the light source, comprising blowing air along the optical transmission path between the image pickup device and the light source through a high-pressure air nozzle using a mine compressed air system as a gas source.
10. A dust measuring system as claimed in claim 1 and claim 2, wherein: the method for cleaning the lens cover and the light source cover comprises the step of cleaning through cleaning liquid and an automatic cleaning brush, an automatic ultrasonic cleaning device, a high-pressure water device or a high-pressure air device.
11. The dust measurement system of claim 1, wherein: the system also comprises a humidity sensor, and the control equipment corrects the detected dust concentration according to the humidity value.
12. The dust measurement system of claim 1, wherein: the method of measuring the distance between the light source and the image pickup device in step (1) of claim 1 includes manual ranging or automatic ranging by a laser range finder.
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