CN110567853B - Mine dust measurement system based on image - Google Patents
Mine dust measurement system based on image Download PDFInfo
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- CN110567853B CN110567853B CN201911008542.2A CN201911008542A CN110567853B CN 110567853 B CN110567853 B CN 110567853B CN 201911008542 A CN201911008542 A CN 201911008542A CN 110567853 B CN110567853 B CN 110567853B
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- 239000000428 dust Substances 0.000 title claims abstract description 121
- 238000005259 measurement Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 claims abstract description 84
- 238000004140 cleaning Methods 0.000 claims abstract description 38
- 238000012545 processing Methods 0.000 claims abstract description 18
- 230000035945 sensitivity Effects 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 230000003287 optical effect Effects 0.000 claims description 23
- 230000005540 biological transmission Effects 0.000 claims description 12
- 239000007788 liquid Substances 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
- 238000007664 blowing Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000012935 Averaging Methods 0.000 claims 1
- 238000005422 blasting Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000149 argon plasma sintering Methods 0.000 description 3
- 230000031700 light absorption Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000005250 beta ray Effects 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 240000005528 Arctium lappa Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 206010035653 pneumoconiosis Diseases 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- 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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- 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 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 pump and dust treatment equipment are not needed, the image acquisition equipment acquires a light source image, dust detection is directly finished 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 zeroing method, a system sensitivity calibration method and the like, further ensures the accuracy of system monitoring data, is particularly suitable for underground dusty environments, and has wide application space.
Description
Technical Field
The invention relates to an image-based mine dust measurement system, 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 the primary energy source. The coal industry is a high-risk industry, accidents such as gas, flood, fire, roof, coal dust and the like afflict the coal mine safety production, wherein the coal dust explosion accidents are large in damage and high in personnel death, so that the mine dust monitoring is an important guarantee for the coal mine safety production, and is also an important measure for preventing and treating pneumoconiosis. The existing mine dust monitoring technology mainly comprises the following steps: tribostatic methods, light scattering methods, light absorption methods, capacitive methods, beta-ray methods, ultrasonic methods, microwave methods. The measuring principle of the capacitance method is simple, but the capacitance measured value and the concentration are not in one-to-one linear relation, and the capacitance measured value is easily influenced by phase distribution and flow pattern change, so that a larger measuring error is caused. Although the beta-ray method is accurate in measurement, the dust needs to be sampled and then subjected to contrast measurement, and the dust concentration is difficult to realize on-line monitoring. The dust concentration measured by the ultrasonic method and the microwave method is still in the experimental research stage, and the number of molded products on the market is small. At present, the dust concentration is monitored on line mainly 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, process dust particles in the air and then pour the processed dust particles into a closed air chamber, detect the dust particles in the air chamber, and have complex equipment structure and high use and maintenance cost. Triboelectric methods are greatly affected by wind speed. In order to ensure accurate and reliable monitoring of mine dust, a new mine dust monitoring technology with simple structure, low use and maintenance cost and accurate detection is required.
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, which comprises a light source, image acquisition equipment and control equipment; the method comprises the steps that light sources and image acquisition equipment are respectively arranged on the sides of a roadway on two sides of a mine roadway, and the light sources irradiate 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 performs dust measurement according to the brightness of the light source in the image; the light source comprises red, green and blue light emitting elements, and can emit light independently or simultaneously in a controlled manner; the image acquisition equipment comprises a transparent lens cover, the light source comprises a transparent light source cover, and the control equipment automatically controls or manually controls the cleaning of the lens cover and the light source cover at intervals of set time; the dust measuring process of the system comprises the following steps:
(1) Measuring the distance between the light source and the image acquisition device;
(2) Closing an automatic white balance function of the image acquisition equipment, and fixing a focal length and an aperture;
(3) Manually or automatically zeroing the system;
(4) The sensitivity calibration is performed on the system manually or automatically;
(5) The control device controls the light source to emit light, and simultaneously controls the image acquisition device to acquire an image containing the light source; determining whether the light transmission path of the light source image acquired by the image acquisition equipment is short for light path interference, if so, repeatedly executing image acquisition and light path interference determination, and if not, executing step (6);
(6) Measuring dust concentration according to the brightness value of the light source in the image;
(7) Repeating the step (5) and the step (6) for image acquisition, light path interference measurement and dust concentration measurement, and returning to execute the step (1) and the following steps when the system operation time reaches the set interval time.
1. The method for zeroing the system by the mine dust measurement system comprises the following specific steps of,
(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, and simultaneously 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 the light transmission path of the image acquisition device for acquiring the light source image is short for light path interference, repeatedly executes image acquisition and light path interference determination if the light path interference is determined to exist, and executes the step (4) if the light path interference is determined to be absent;
(4) And (3) 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 zeroing of the equipment.
2. The method for calibrating the sensitivity of the mine dust measurement system comprises the following specific steps:
(1) The method comprises setting a shading sheet between a lens and a light source or spraying dust and air mixture with standard dust concentration;
(2) The control device controls the light source to emit light, and simultaneously 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 the light transmission path of the image acquisition device for acquiring the light source image is short for light path interference, repeatedly executes image acquisition and light path interference determination if the light path interference is determined to exist, and executes the step (3) if the light path interference is determined to be absent;
(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 dust concentration state;
(4) Changing the light path environments of 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 value of each monochromatic light source under the dust set value; when the light path environment is simulated by adopting the shading sheet, the brightness value of each monochromatic light source is required to be corrected according to the distance between the light source and the image acquisition equipment;
(5) And (3) processing the light source brightness value corresponding data table obtained in the step (4) and the zeroing data obtained in the step (3) of the claim 1, and fitting to obtain a function formula yR＝fR(xR)、yG＝fG(xG)、yB＝fB(xB) which takes a dust set value as a dependent variable and the brightness value x R、xG、xB of each monochromatic light source as an independent variable as a dust measurement formula of the system.
Further, in specific use, the brightness value x R、xG、xB of each monochromatic light source is substituted into the formula yR＝fR(xR)、yG＝fG(xG)、yB＝fB(xB), to obtain y R、yG、yB, and the average value is calculatedThe y value was used as the dust concentration value.
In a further embodiment, the method for simulating the light path environment of the set dust concentration comprises the steps of arranging a light shielding sheet for simulating the set dust concentration between a lens and a light source, wherein the light shielding coefficient of the light shielding sheet is measured under the conditions of laboratory closed environment and set measurement distance.
3. According to the mine dust measurement system of the present application, in a further embodiment, the presence or absence of interference in the light path is determined by:
(1) The control device controls the red light-emitting element to emit light; meanwhile, the control equipment controls the image acquisition equipment to acquire an image containing a light source, and processes the image to respectively obtain brightness values L R、LG、LB of R, G, B of a light source area in the RGB image; when (when) Or (b)If the measured light path is interfered when the measured light path exceeds a fixed threshold K R, ending the light path interference measurement; otherwise, continuing to execute the step (2);
(2) The control device controls the green light-emitting element to emit light; meanwhile, the control equipment controls the image acquisition equipment to acquire an image containing a light source, and processes the image to respectively obtain brightness values L R、LG、LB of R, G, B of a light source area in the RGB image; when (when) Or (b)If the measured light path is interfered when the measured light path exceeds a set threshold K G, ending the light path measurement; otherwise, continuing to execute the step (3);
(3) The control device controls the blue light-emitting element to emit light; meanwhile, the control equipment controls the image acquisition equipment to acquire an image containing a light source, and processes the image to respectively obtain brightness values L R、LG、LB of R, G, B of a light source area in the RGB image; when (when) Or (b)If the measured light path is beyond the set threshold K B, the measured light path is disturbed, otherwise, the measured light path is not disturbed, and the light path measurement is ended;
the K R、KG、KB is obtained through measurement setting or manual setting.
4. According to the mine dust measuring system of the present application, in a further embodiment, the light path is defined by the steps of
Whether interference is present is determined:
(1) The control device controls the red light-emitting element to emit light; meanwhile, the control equipment controls the image acquisition equipment to acquire an image containing a light source, and processes the image to respectively obtain brightness values L R、LG、LB of R, G, B of a light source area in the RGB image; when L R-LG or L R-LB is smaller than a set threshold F R, the interference of the optical path is detected, and the optical path detection is ended; otherwise, continuing to execute the step (2);
(2) The control device controls the green light-emitting element to emit light; meanwhile, the control equipment controls the image acquisition equipment to acquire an image containing a light source, and processes the image to respectively obtain brightness values L R、LG、LB of R, G, B of a light source area in the RGB image; when L G-LR or L G-LB is smaller than a set threshold F G, the interference of the optical path is detected, and the optical path detection is ended; otherwise, continuing to execute the step (3);
(3) The control device controls the blue light-emitting element to emit light; meanwhile, the control equipment controls the image acquisition equipment to acquire an image containing a light source, and processes the image to respectively obtain brightness values L R、LG、LB of R, G, B of a light source area in the RGB image; when L B-LR or L B-LG is smaller than a set threshold F B, determining that the light path is interfered, otherwise, determining that the light path is not interfered, and ending the light path determination;
the F R、FG、FB is obtained through measurement setting or manual setting.
5. The mine dust measurement system further includes: the method for removing dust between the image capturing device and the light source includes releasing air with a high-pressure air cylinder, and blowing air through a high-pressure air nozzle along an optical transmission path between the image capturing device and the light source.
6. The mine dust measurement system further includes: the method for removing dust between the image acquisition equipment and the light source comprises the step of blowing air along an optical transmission path between the image acquisition equipment and the light source through a high-pressure air nozzle by using a mine air compression system as an air source.
7. The mine dust measurement system further includes: methods of cleaning the lens cover and the light source cover include cleaning by a cleaning liquid and an automatic cleaning brush, an automatic ultrasonic cleaning apparatus, a high-pressure water apparatus, or a high-pressure air apparatus.
8. The mine dust measurement system further comprises a humidity sensor, and the control equipment corrects the dust concentration obtained through detection according to the humidity value.
9. The mine dust measurement system further includes: methods of measuring the distance of the light source and the image acquisition device include manual ranging or automatic ranging by a laser rangefinder.
The invention has the beneficial effects that: the mine dust measurement adopts the open air chamber, does not need an air pump and dust treatment equipment, directly completes dust detection through image processing, has a simple system structure, and is 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 zeroing method, a system sensitivity calibration method and the like, further ensures the accuracy of system monitoring data, is particularly suitable for underground dusty environments, and has wide application space.
Drawings
FIG. 1 is a schematic diagram of an exemplary architecture of an image-based mine dust measurement system implementation.
FIG. 2 is a workflow diagram of an image-based mine dust measurement system.
Fig. 3 is a workflow diagram for zeroing a mine dust measurement system based on an image.
FIG. 4 is a workflow diagram of sensitivity calibration of an image-based mine dust measurement system.
Fig. 5 is a flowchart of an embodiment of the image-based mine dust measurement system for determining whether there is interference with the optical path in the embodiment 1.
FIG. 6 is a flowchart of an embodiment of the image-based mine dust measurement system for determining whether there is a disturbance in the optical path of the light.
Detailed Description
The following description of the technical solutions in the application embodiments will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
An embodiment of the mine dust measurement system is shown in fig. 1, and the system comprises:
1. The controller (101) is core control and data processing equipment of the system, is responsible for controlling a light source, a camera, a light source cover cleaning equipment, a lens cover cleaning equipment, an optical path cleaning equipment and a dust concentration simulation equipment, collects humidity data of a humidity sensor and video image data of the camera and processes the humidity data, realizes the work of dust monitoring, cleaning of the light source cover and the lens cover, optical path cleaning zero setting, sensitivity calibration and the like, is also responsible for communicating with the on-well equipment, sends dust monitoring data to the on-well equipment, and receives control instructions sent by the on-well equipment. 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. 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) comprises red, green and blue light emitting elements, can emit light independently or simultaneously under control, and can adopt RGB full-color LEDs. With a light source cover.
4. The light source cover cleaning device (104) is used for cleaning the light source cover and can adopt cleaning liquid and automatic cleaning brush, automatic ultrasonic cleaning device, high-pressure water device or high-pressure air device for cleaning. The light source cover cleaning equipment is connected with the controller through a communication cable, and the controller is used for controlling the work.
5. The lens cover cleaning device (105) is used for cleaning the lens cover of the camera, and can adopt cleaning liquid and automatic cleaning brush, automatic ultrasonic cleaning device, high-pressure water device or high-pressure air device for cleaning, and the principle is the same as that of the light source cover cleaning device (104). The light source cover cleaning equipment is connected with the controller through a communication cable, and the controller is used for controlling the work.
6. The camera (106), i.e. the image acquisition device, uses a color camera with a lens cover.
7. Dust concentration simulation means (107) for simulating the light path environment of the set point dust concentration, the present example employing means controllable by the control means to place a gobo in front of the camera lens.
8. The optical path cleaning device (108) is used for cleaning dust on an optical transmission path between the light source and the camera when the system is in zero adjustment, and can adopt a high-pressure air bottle as an air source, blow air along the optical transmission path through a high-pressure air nozzle and also adopt a mine air compression system as the air source. In this example, a high pressure air cylinder is used as the air source. The light path cleaning device is connected with the controller through a communication cable, and is controlled by the controller to control the air valve switch to work.
9. A high pressure air cylinder (109), in this example, serves as the air source for the optical path cleaning apparatus.
An example of the mine dust measurement system workflow implementation is shown in fig. 2:
(201) Manually ranging or automatically measuring the distance between the light source and the image acquisition equipment through a laser range finder, and acquiring distance data by a controller;
(202) Closing an automatic white balance function of the image acquisition equipment, fixing a focal length and an aperture, and locking camera parameters;
(203) Manually or automatically zeroing the system, if manual zeroing is adopted, the hand-held equipment is required to be used for sending control signal data required by zeroing to the controller;
(204) Manually or automatically calibrating the sensitivity of the system, if manual sensitivity calibration is adopted, the control signal data required by the sensitivity calibration is required to be sent to the controller by using the handheld device;
(205) The control device controls each monochromatic light source to emit light, and meanwhile, the control device controls the image acquisition device to acquire images containing the light sources;
(206) Determining whether the light path is interfered, returning to (205) to repeatedly perform image acquisition and light path interference determination if the light path is interfered, and performing step (207) if the light path is not interfered;
(207) Measuring dust concentration according to the brightness value of each monochromatic light source in the image;
(208) Determining whether the system running time reaches a set interval time, if so, returning to (201) to restart measuring the distance and the following steps; otherwise, returning to (205) for image acquisition, light path interference measurement and dust concentration measurement.
An example of the zeroing 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 adopting high-pressure dust-free gas to remove dust between the image acquisition equipment and the light source;
(303) The control device controls the light source to emit light;
(304) Meanwhile, the control device controls the image acquisition device to acquire an image containing the light source;
(305) Processing the image to obtain brightness values of all monochromatic light sources in the image;
(306) Determining whether the light path is interfered, if so, returning to (303) to repeatedly perform the light source luminescence and the following steps, and if not, performing step (307);
(307) And (3) recording the brightness value of each monochromatic light source in the obtained image (305) as the brightness value of the light source in the dust-free state, and completing the zeroing of the equipment.
An embodiment of the sensitivity calibration workflow of the mine dust measurement system is shown in fig. 4:
(401) The method comprises setting a shading sheet between a lens and a light source or spraying dust and air mixture with standard dust concentration;
(402) The control device controls the light source to emit light;
(403) The control device controls the image acquisition device to acquire an image containing the light source;
(404) Processing the image to obtain brightness values of all monochromatic light sources in the image;
(405) Determining whether the light path is interfered or not, returning to the step (402) if the light path is determined to be interfered, and executing the step (406) if the light path is determined to be non-interfered;
(406) Recording the brightness value of each monochromatic light source in the obtained image (404) as the brightness value of the light source in the dust concentration state;
(407) Determining whether the recording of the brightness values of the light sources for all dust concentrations required for the system sensitivity is completed, if so, executing (409), otherwise executing (408) and returning (402);
(408) Changing the light path environment of 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 the light sources of all dust concentrations; when the light path environment is simulated by adopting the shading sheet, the brightness value of each monochromatic light source is required to be corrected according to the distance data between the light source and the image acquisition equipment;
(410) And (3) processing the light source brightness value corresponding data table and the zeroing data obtained in the step (409), and fitting to obtain a function formula yR＝fR(xR)、yG＝fG(xG)、yB＝fB(xB) which takes a dust set value as a dependent variable and the brightness value x R、xG、xB of each monochromatic light source as an independent variable as a dust measurement formula of the system.
When the method is specifically used, the brightness value x R、xG、xB of each monochromatic light source is substituted into a formula yR＝fR(xR)、yG＝fG(xG)、yB＝fB(xB), to obtain y R、yG、yB, and the average value is calculatedThe y value was used as the dust concentration value.
The flow of the implementation example 1 of the mine dust measurement system for determining whether the light path is interfered is shown in fig. 5, and the threshold K R、KG、KB in the determination process is obtained through measurement setting or manual setting.
(501) The control device controls the red light-emitting element to emit light;
(502) The control device controls the image acquisition device to acquire an image containing the light source;
(503) Processing the image to obtain brightness values L R、LG、LB of R, G, B of the light source areas in the RGB image respectively;
(504) Respectively carrying out ratio operation on L G、LB and L R when Or (b)Exceeding a fixed threshold K R, then executing (513); otherwise, executing the step (505);
(505) The control device controls the green light-emitting element to emit light;
(506) The control device controls the image acquisition device to acquire an image containing the light source;
(507) Processing the image to obtain brightness values L R、LG、LB of R, G, B of the light source areas in the RGB image respectively;
(508) Respectively carrying out ratio operation on L R、LB and L G when Or (b)Exceeding the set threshold K G, then executing (513); otherwise, executing step (509);
(509) The control device controls the blue light-emitting element to emit light;
(510) The control device controls the image acquisition device to acquire an image containing the light source;
(511) Processing the image to obtain brightness values L R、LG、LB of R, G, B of the light source areas in the RGB image respectively;
(512) Respectively carrying out ratio operation on L R、LG and L B when Or (b)If the set threshold value K B is exceeded, executing (513), otherwise executing (514);
(513) Judging that the light path interference exists;
(514) And judging that no road interference exists.
The flow of the embodiment 2 of the mine dust measuring system for determining whether the light path is interfered is shown in fig. 6, and the threshold F R、FG、FB in the determining process is obtained through measurement setting or manual setting.
(601) The control device controls the red light-emitting element to emit light;
(602) The control device controls the image acquisition device to acquire an image containing the light source;
(603) Processing the image to obtain brightness values L R、LG、LB of R, G, B of the light source areas in the RGB image respectively;
(604) Performing difference operation on L R and L G、LB respectively, and executing (613) when L R-LG or L R-LB is smaller than a set threshold F R; otherwise, executing step (605);
(605) The control device controls the green light-emitting element to emit light;
(606) The control device controls the image acquisition device to acquire an image containing the light source;
(607) Processing the image to obtain brightness values L R、LG、LB of R, G, B of the light source areas in the RGB image respectively;
(608) Performing difference operation on L G and L R、LB respectively, and executing (613) if L G-LR or L G-LB is smaller than a set threshold F G; otherwise, executing step (609);
(609) The control device controls the blue light-emitting element to emit light;
(610) The control device controls the image acquisition device to acquire an image containing the light source;
(611) Processing the image to obtain brightness values L R、LG、LB of R, G, B of the light source areas in the RGB image respectively;
(612) Performing difference operation on L B and L R、LG respectively, and executing when L B-LR or L B-LG is smaller than the set threshold F B
(613) Otherwise, executing step (614);
(613) Judging that the light path interference exists;
(614) And judging that no road interference exists.
Claims (10)
1. Mine dust measurement system based on image, its characterized in that: the system comprises a light source, an image acquisition device and a control device; the method comprises the steps that light sources and image acquisition equipment are respectively arranged on the sides of a roadway on two sides of a mine roadway, and the light sources irradiate 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 performs dust measurement according to the brightness of the light source in the image; the light source comprises red, green and blue light emitting elements, and can emit light independently or simultaneously in a controlled manner; the image acquisition equipment comprises a transparent lens cover, the light source comprises a transparent light source cover, and the control equipment automatically controls or manually controls the cleaning of the lens cover and the light source cover at intervals of set time; the dust measuring process of the system comprises the following steps:
(1) Measuring the distance between the light source and the image acquisition device;
(2) Closing an automatic white balance function of the image acquisition equipment, and fixing a focal length and an aperture;
(3) Manually or automatically zeroing the system;
(4) The sensitivity calibration is performed on the system manually or automatically;
(5) The control device controls the light source to emit light, and simultaneously controls the image acquisition device to acquire an image containing the light source; determining whether the light transmission path of the light source image acquired by the image acquisition equipment is short for light path interference, if so, repeatedly executing image acquisition and light path interference determination, and if not, executing step (6);
(6) Measuring dust concentration according to the brightness value of the light source in the image;
(7) Repeating the step (5) and the step (6) for image acquisition, light path interference measurement and dust concentration measurement, and returning to execute the step (1) and the following steps when the system operation time reaches the set interval time.
The method for calibrating the sensitivity of the system in the process step (4) of measuring dust by the system specifically comprises the following steps:
(1) The method comprises setting a shading sheet between a lens and a light source or spraying dust and air mixture with standard dust concentration;
(2) The control device controls the light source to emit light, and simultaneously 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 the light transmission path of the image acquisition device for acquiring the light source image is short for light path interference, repeatedly executes image acquisition and light path interference determination if the light path interference is determined to exist, and executes the step (3) if the light path interference is determined to be absent;
(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 dust concentration state;
(4) Changing the light path environments of 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 value of each monochromatic light source under the dust set value; when the light path environment is simulated by adopting the light shielding sheet, the brightness value of each monochromatic light source is required to be corrected according to the distance data obtained in the step (1) of the dust measuring process of the system;
Processing a light source brightness value corresponding data table obtained in the method step (4) for calibrating the sensitivity of the system and zeroing data obtained in the process step (3) for measuring dust by the system, and fitting to obtain a function formula yR＝fR(xR)、yG＝fG(xG)、yB＝fB(xB) which takes a dust set value as a dependent variable and the brightness value x R、xG、xB of each monochromatic light source as the independent variable as a dust measurement formula of the system;
Further, the method for detecting dust concentration in the dust measuring process step (6) of the system comprises substituting the brightness value x R、xG、xB of each monochromatic light source into a formula yR＝fR(xR)、yG＝fG(xG)、yB＝fB(xB) obtained in the specific sensitivity calibration method step (5), obtaining y R、yG、yB, and averaging The y value was used as the dust concentration value.
2. The dust measurement system of claim 1, wherein: process step (3) of measuring dust by the system according to claim 1 the method of zeroing the system is in particular,
(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, and simultaneously 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 the light transmission path of the image acquisition device for acquiring the light source image is short for light path interference, repeatedly executes image acquisition and light path interference determination if the light path interference is determined to exist, and executes the step (4) if the light path interference is determined to be absent;
(4) And (3) 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 zeroing of the equipment.
3. The dust measurement system of claim 1, wherein: the process step (5) of measuring dust by the system of claim 1, the method for determining whether there is interference with the light path comprising:
(1) The control device controls the red light-emitting element to emit light; meanwhile, the control equipment controls the image acquisition equipment to acquire an image containing a light source, and processes the image to respectively obtain brightness values L R、LG、LB of R, G, B of a light source area in the RGB image; when (when) Or (b)If the measured light path is interfered when the measured light path exceeds a fixed threshold K R, ending the light path interference measurement; otherwise, continuing to execute the step (2);
(2) The control device controls the green light-emitting element to emit light; meanwhile, the control equipment controls the image acquisition equipment to acquire an image containing a light source, and processes the image to respectively obtain brightness values L R、LG、LB of R, G, B of a light source area in the RGB image; when (when) Or (b)If the measured light path is interfered when the measured light path exceeds a set threshold K G, ending the light path measurement; otherwise, continuing to execute the step (3);
(3) The control device controls the blue light-emitting element to emit light; meanwhile, the control equipment controls the image acquisition equipment to acquire an image containing a light source, and processes the image to respectively obtain brightness values L R、LG、LB of R, G, B of a light source area in the RGB image; when (when) Or (b)If the measured light path is beyond the set threshold K B, the measured light path is disturbed, otherwise, the measured light path is not disturbed, and the light path measurement is ended;
the K R、KG、KB is obtained through measurement setting or manual setting.
4. The dust measurement system of claim 1, wherein: the method for determining whether there is interference in the optical path in the process step (5) of measuring dust by the system of claim 1, comprising:
(1) The control device controls the red light-emitting element to emit light; meanwhile, the control equipment controls the image acquisition equipment to acquire an image containing a light source, and processes the image to respectively obtain brightness values L R、LG、LB of R, G, B of a light source area in the RGB image; when L R-LG or L R-LB is smaller than a set threshold F R, the interference of the optical path is detected, and the optical path detection is ended; otherwise, continuing to execute the step (2);
(2) The control device controls the green light-emitting element to emit light; meanwhile, the control equipment controls the image acquisition equipment to acquire an image containing a light source, and processes the image to respectively obtain brightness values L R、LG、LB of R, G, B of a light source area in the RGB image; when L G-LR or L G-LB is smaller than a set threshold F G, the interference of the optical path is detected, and the optical path detection is ended; otherwise, continuing to execute the step (3);
(3) The control device controls the blue light-emitting element to emit light; meanwhile, the control equipment controls the image acquisition equipment to acquire an image containing a light source, and processes the image to respectively obtain brightness values L R、LG、LB of R, G, B of a light source area in the RGB image; when L B-LR or L B-LG is smaller than the set threshold F B, the optical path is measured to be interfered, otherwise, the optical path is measured to be undisturbed,
And ending the light path measurement;
the F R、FG、FB is obtained through measurement setting or manual setting.
5. The dust measurement system of claim 1, wherein: the method for calibrating the sensitivity of the system according to the claim 1, wherein the method for simulating the light path environment of the set dust concentration in the step (1) comprises the steps of arranging a light shielding sheet for simulating the set dust concentration between a lens and a light source, and measuring the light shielding coefficient of the light shielding sheet under the conditions of laboratory closed environment and set measurement distance.
6. The dust measurement system of claim 2, wherein: the method of removing dust between an image capturing device and a light source according to claim 2, wherein the step (2) comprises releasing air from the high-pressure air cylinder and blowing air through the high-pressure air nozzle along the optical transmission path between the image capturing device and the light source.
7. The dust measurement system of claim 2, wherein: a method of cleaning dust between an image capturing device and a light source according to claim 2, wherein the method comprises blasting air through a high pressure air nozzle along an optical transmission path between the image capturing device and the light source using a mine air compression system as an air source.
8. The dust measurement system of claim 1, wherein: methods of cleaning the lens cover and the light source cover include cleaning by a cleaning liquid and an automatic cleaning brush, an automatic ultrasonic cleaning apparatus, a high-pressure water apparatus, or a high-pressure air apparatus.
9. 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.
10. The dust measurement system of claim 1, wherein: the process of measuring dust by the system of claim 1 step (1) the method of measuring the distance of the light source and the image acquisition device comprises manual ranging or automatic ranging by a laser rangefinder.
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