CN211528235U

CN211528235U - Detection light source device applied to near-field uniform illumination paper defect detection and convenient to control

Info

Publication number: CN211528235U
Application number: CN202020069375.4U
Authority: CN
Inventors: 汤伟; 成爽爽; 冯波
Original assignee: Shaanxi University of Science and Technology
Current assignee: Shaanxi University of Science and Technology
Priority date: 2020-01-13
Filing date: 2020-01-13
Publication date: 2020-09-18
Anticipated expiration: 2030-01-13

Abstract

The utility model discloses a detection light source device convenient to control for near field uniform lighting paper defect detection, including locating the support horizontal pole below the detected paper, be equipped with slide rail and rack respectively along the pole length of support horizontal pole, sliding connection has a plurality of lamp stands on the slide rail, all is equipped with a LED lamp that is used for paper defect detection illumination on each lamp stand, still is fixed with a step motor on each lamp stand respectively, all hub connections a gear on each step motor's the output shaft, each gear all with the rack meshes, all sets up a distance measuring module that is used for measuring this lamp stand and its right side between adjacent lamp stands on the right side wall of each lamp stand; each LED lamp is respectively and electrically connected with an LED lamp power adjusting device and a power supply, and the LED lamp power adjusting device is in signal connection with a controller; the controller is also in signal connection with each stepping motor, the ranging module and the touch setting screen. The utility model discloses can be according to the power of the convenient regulation of detection needs and the interval of LED lamp.

Description

Detection light source device applied to near-field uniform illumination paper defect detection and convenient to control

Technical Field

The utility model relates to a paper quality check out test set field in the industrial production, concretely relates to be applied to detection light source device of being convenient for control that near field even illumination paper defect detected.

Background

Paper defects refer to defects or flaws in the paper that occur during the production of the paper as a result of the production process, which defects can affect the quality of the paper. The main function of paper defect detection is to find the existence of paper defects in advance and mark the paper defects so as to remove the paper defect areas in time when the paper is rewound.

The paper defect detection technology using light source optimization (such as a paper defect detection method based on near-field uniform illumination, a paper defect detection method based on a flora algorithm and the like) takes the uniformity of the gray level of an image of a detected paper defect as an optimization target, carries out optimization operation on parameters of a light source system by using the flora algorithm on the basis of fitting an illumination distribution function of LED point light sources, carries out structure optimization on the light source system according to an optimization result, and simultaneously carries out power control on each LED point light source. Because the problems that the irradiation effect of the linear LED light source is not uniform and the power control circuit needs to be changed according to the image gray value exist in the paper defect detection system, the positions of the LED lamp beads of the detection light source are not flexible and adjustable, and the power of the lamp beads is not changed, the positions of the LED lamp beads and the power of a power supply need to be dynamically adjusted for many times, and the operation is complicated.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the problem that exists among the above-mentioned prior art, provide a be applied to the detection light source device of the control of being convenient for that near field uniform lighting paper detected, can be according to the power of the convenient regulation of detection needs and the interval of LED lamp.

The technical scheme of the utility model is that: the detection light source device which is applied to near-field uniform illumination paper defect detection and is convenient to control comprises a support cross rod arranged below detected paper, and is characterized in that a slide rail and a rack are respectively arranged along the rod length of the support cross rod, a plurality of lamp holders are connected to the slide rail in a sliding manner, an LED lamp for paper defect detection illumination is arranged on each lamp holder, a stepping motor is further fixed on each lamp holder, a gear is connected to an output shaft of each stepping motor in a shaft connection manner, each gear is meshed with the rack, and a distance measurement module for measuring the distance between the lamp holder and the adjacent lamp holder on the right side of the lamp holder is arranged on the right side wall of each lamp holder; each LED lamp is respectively and electrically connected with an LED lamp power adjusting device and a power supply, and the LED lamp power adjusting device is in signal connection with a controller; the controller is also in signal connection with each stepping motor, the ranging module and the touch setting screen.

The LED lamp power adjusting device comprises a plurality of power controllers which correspond to the LED lamps one by one, and each power controller is electrically connected with the controller and the corresponding LED lamp.

The power controller is a rheostat, the rheostat is connected between the corresponding LED lamp and the power supply in series, the rheostat is in signal connection with the controller, and the output resistance value of the rheostat is controlled through the controller, so that the voltage value loaded on the corresponding LED lamp is changed.

The distance measuring module is an infrared distance measuring module or a laser distance measuring module.

The utility model has the advantages that: the utility model provides a detection light source device can cooperate the more convenient more intelligent realization of paper defect detection method based on the even illumination of near field to the power of each LED lamp and the regulation of LED lamp interval.

Drawings

FIG. 1 is a detailed electrical system connection block diagram of the present invention;

fig. 2 is a schematic structural diagram of the paper defect detecting system applied to the whole near-field uniform illumination of the present invention;

fig. 3 is a block diagram of the electrical system connections of the entire near field uniform illumination paper defect detection system.

Detailed Description

In the following, an embodiment of the present invention will be described in detail with reference to the drawings, but it should be understood that the scope of the present invention is not limited by the embodiment.

Referring to fig. 1, 2 and 3, the utility model discloses be applied to the paper defect detecting system of near field uniform lighting, whole paper defect detecting system is including locating the CCD camera 11 above being detected paper 10, CCD camera 11 is connected with elevating system 3, elevating system 3 is used for adjusting the height h of CCD camera to detecting the paper, elevating system 3 is fixed in on the support body 1, CCD camera 11 specifically is connected with elevating system 3 through link 17, it moves forward to be detected paper 10 through paper transport mechanism in the in-process that detects; the utility model discloses a below that is detected paper 10 is located to the main part, the utility model discloses a structure includes: the paper defect detection device comprises a supporting cross rod 2 arranged below a detected paper 10, a slide rail 13 and a rack 4 are respectively arranged along the rod length of the supporting cross rod 2, the slide rail 13 is connected with a plurality of lamp holders 6 in a sliding mode, each lamp holder 6 is provided with an LED lamp 5 used for paper defect detection illumination, each lamp holder 6 is also fixed with a stepping motor 8, an output shaft of each stepping motor 8 is connected with a gear 9 in a shaft mode, each gear 9 is meshed with the rack 4, the right side wall of each lamp holder 6 is provided with a distance measurement module 7 used for measuring the distance between the lamp holder 6 and the adjacent lamp holder 6 on the right side of the lamp holder, and the distance measurement module 7 can be an infrared distance measurement module or a laser distance measurement module; each LED lamp 5 is respectively and electrically connected with an LED lamp power adjusting device 16 and a power supply 15, and the LED lamp power adjusting device 16 is in signal connection with a controller 14; the controller 14 is also in signal connection with the stepping motors 8, the distance measuring module 7 and a touch setting screen 18 for inputting and displaying parameters. The LED lamp power adjusting device comprises a plurality of varistors which correspond to the LED lamps one to one, the varistors are connected between the corresponding LED lamps and the power supply in series, the varistors are in signal connection with the controller, and the output resistance values of the varistors are controlled through the controller, so that the voltage values loaded on the corresponding LED lamps are changed.

The utility model discloses to the interval of LED lamp and the adjustment working process of power do: the controller 14 controls the stepping motor 8 on the lamp holder 6 where the right LED lamp 5-1, the right LED lamp 5-2 and the right LED lamp 5-n on the right side of the middle LED lamp 5-0 are respectively located to rotate in sequence according to the numerical value of the bead spacing d input to the touch setting screen 18, so as to sequentially adjust the spacing between the middle LED lamp 5-0 and each LED lamp 5 on the right side thereof, so that the spacing between each adjacent LED lamp 5 is equal to the input bead spacing d, wherein the position of the middle LED lamp 5-0 is kept unchanged in the whole adjustment process, in the adjustment process, the distance measuring module 7 on the lamp holder 6 where each LED lamp 5 is located is used for detecting the spacing between the middle LED lamp 5 and the adjacent LED lamp 5 on the right side in real time, and when the spacing data is equal to the input bead spacing d, the controller 14 controls the stepping motor 8 on the lamp holder 6 where the adjacent LED lamp 5 on the right side is located to stop rotating (the letter n is the total number of the LED lamps minus 1 Divided by 2) so that the right adjacent LED lamp 5 stops moving; in the adjusting process, the controller 14 also controls the stepping motor 8 on the lamp holder 6 respectively positioned by the left LED lamp 5-1 'and the left LED lamp 5-2' on the left side of the middle LED lamp 5-0 to rotate at the same time, thereby adjusting the distance between the middle LED lamp 5-0 and each LED lamp 5 on the left side thereof in turn to make the distance between each adjacent LED lamp 5 equal to the inputted lamp bead distance d, in the adjusting process, the distance measuring module 7 on the lamp holder 6 where each LED lamp 5 on the left side of the middle LED lamp 5-0 is located is used for detecting the distance between the distance measuring module and the LED lamp 5 adjacent to the right side in real time, when the distance data is equal to the inputted bead distance d, the controller 14 controls the stepping motor 8 on the lamp holder 6 where the LED lamp 5 is located to stop rotating, so that the LED lamp 5 stops moving; the position adjusting process of the LED lamp is as follows: keeping the position of the middle LED lamp 5-0 unchanged, and sequentially adjusting the distance between the LED lamps which are gradually far away from the middle LED lamp 5-0 by taking the middle LED lamp 5-0 as a center, so that the distance between the LED lamps finally accords with the required lamp bead distance d.

In terms of LED lamp power adjustment, the controller 14 controls the LED lamp power adjusting device 16 to adjust the power of each LED lamp 5 according to the total actual power Wn corresponding to each LED lamp 5 input to the touch setting screen 18, so that the power of each LED lamp 5 finally satisfies the total actual power Wn. Specifically, the LED lamp power adjusting device 16 includes a plurality of power controllers 16-1 corresponding to the LED lamps 5 one by one, and the controller 14 controls the power controller 16-1 corresponding to a certain LED lamp 5 to adjust the power of the LED lamp 5 according to the actual total power Wn corresponding to the LED lamp 5 input to the touch setting screen 18, so that the power of the LED lamp 5 finally satisfies the corresponding actual total power Wn. The power controller 16-1 is specifically a rheostat, each rheostat is connected in series between the corresponding LED lamp 5 and the power supply 15, and each rheostat is in signal connection with the controller 14, and the output resistance value of each rheostat is controlled through the controller 14, so that the voltage value loaded on the corresponding LED lamp 5 is changed, and the purpose of adjusting the power of the corresponding LED lamp 5 is achieved. Each power controller 16-1 can also be a power module with variable voltage electrically connected with the power supply 15, each power module corresponds to one LED lamp 5 and supplies power to the corresponding LED lamp 5, each power module is in signal connection with the controller 14 and the power supply voltage of the power module is controlled by the controller 14; the controller 14 controls the power supply voltage of each power supply module to the corresponding LED lamp 5, so as to change the voltage value loaded on the corresponding LED lamp 5, and achieve the purpose of adjusting the power of each LED lamp 5. The controller can adopt a single chip microcomputer with the model of STC89C 51.

The utility model provides a be applied to near field even illumination paper defect detection light source device of being convenient for control that detects can be applied to the paper defect detection technique that uses the light source to optimize, for example can be applied to paper defect detection method based on near field even illumination, paper defect detection method based on flora algorithm etc. required many times adjustment light source's operation in the convenient realization detects.

In the paper defect detection, paper is used as a secondary light source and belongs to diffuse reflection, light rays emitted by all lamp beads are not perpendicular to a camera, most of light rays emitted by the lamp beads at the middle positions vertically enter the camera, and only one part of light rays emitted by the lamp beads at other positions enter the camera at different angles through diffuse reflection. The CCD camera is adopted as image acquisition equipment in paper defect detection, light emitted by a light source can be passively received, and the transverse span of a detected surface is large, so that the light emitted to the CCD camera is gradually decreased from the middle to two ends, and the phenomenon of uneven gray scale of bright middle and dark two ends of an image is caused. The even secondary light source mainly follows the linear array camera directly below, and the perpendicular to detection face upwards launches light, and the luminous flux of the lamp pearl directive camera of intermediate position is obviously than the luminous flux of nth lamp pearl light diffuse reflection to camera direction. In order to solve the problem, the utility model discloses in mention the paper defect detection method based on near field uniform lighting realize the increase of distal end luminous flux through the power that increases distal end direction lamp pearl, and the luminous flux of light entering camera according to all the other position lamp pearls, adjust the lamp pearl power of all the other positions, so that it gets into the luminous flux increase of camera through light diffuse reflection, the grey scale value that finally reaches the paper both ends is close with the grey scale value in the middle of the paper, improve the grey scale degree of the paper image that the camera was taken, finally improve the imaging quality of paper, make the detection of paper defect more accurate.

The utility model discloses a paper defect detection method based on near field uniform lighting mentions, including following step:

1) calculating the distance between the lamp beads according to the Spiro rule

Wherein z is the vertical distance from the lamp bead to the detected paper, m is a value related to the distance between the light-emitting area and the curvature center of the packaging lens, and is a given value, and the value of m is 1;

2) calculating an included angle alpha between the direction of the nth lamp bead perpendicular to the detected paper surface and the direction of the lamp bead pointing to the camera according to a formula, wherein the included angle alpha is a light included angle of detection light from the detected paper surface to the camera through diffuse reflection;

α＝90°-artg(h/(n*d))

in the formula, h is the height from the camera to the detection paper surface; the nth lamp bead is the number of the lamp beads which take the middle position lamp bead as the starting point and are sequentially far away from the middle position lamp bead, for example, the number n of the lamp bead adjacent to the middle position lamp bead on the left side and the right side of the middle position lamp bead is 1, the number n of the lamp bead on the left side and the right side of the middle position lamp bead spaced by one lamp bead is 2, and the like, the number of the lamp bead which is farther away from the middle position lamp bead is larger, and the numbers of the lamp beads on the left side and the right side;

3) experiments prove that the change of the image gray level uniformity is directly related to the luminous flux of the lamp bead, and the luminous flux of the lamp bead is directly related to the power of the lamp bead; the closer the power W of the lamp bead at the middle position and the power of the lamp bead at the nth lamp bead in the direction of the camera are, the closer the luminous flux of the lamp bead at the middle position emitted to the camera and the luminous flux of the lamp bead at the nth lamp bead in the direction of the camera are, and the closer the relation between the paper image gray value corresponding to the lamp bead at the middle position and the paper image gray value corresponding to the lamp bead at the nth lamp bead is. The larger the lamp bead power at the nth position is, the larger the luminous flux is reflected to the camera direction through diffusion, and the larger the gray value is. The light rays emitted to the camera at the nth lamp bead are Wn cos (alpha), and because alpha is 90-artg (h/(n) d), the total power of the nth lamp bead is an empirical formula:

in the formula, W represents the rated power of the lamp beads, namely the power of the lamp beads at the middle position, Wn represents the actual total power of the nth lamp bead, and t is a weight coefficient. In the current experimental environment, if the distance h from the paper to the camera is 65cm, the height h is substituted into the formula, and a value of W1 … W10 can be obtained. Wherein the nth lamp bead needs increased power of

The power that nth lamp pearl light diffuse reflection arrived the camera is W.

4) And (3) adjusting the total actual power of each lamp bead to enable the total actual power to meet the Wn value calculated in the step 3), and thus carrying out paper defect detection under the condition that the total actual power of each lamp bead is the Wn value.

The method for determining the weight coefficient t in the formula comprises the following steps:

a. firstly, sequentially selecting a plurality of values from large to small from an interval [1.000, 0.001] as initial t values, and then calculating the power Wn of each lamp bead under each initial t value through the formula;

b. b, under each initial t value in the step a, adjusting the actual power of each lamp bead to enable the actual power of each lamp bead to be equal to the corresponding Wn value calculated when each initial t value is obtained, and then testing the gray degree uniformity of the paper under each initial t value;

c. testing the gray level uniformity: firstly, taking the column of the image as a unit, adding and summing the gray values of the pixels in the column, and then dividing the sum by the total number of the pixels in the column to obtain the gray average value of the column; respectively calculating each column to obtain the gray average value of each column; then, selecting a maximum gray average value and a minimum gray average value from the gray average values of all the columns, and dividing the minimum gray average value by the maximum gray average value to obtain the percentage of gray uniformity, wherein the larger the percentage is, the better the effect of the gray uniformity is (the gray uniformity of the paper image is only close to 1);

d. after testing the gray level uniformity under different t values (namely the gray level uniformity corresponding to each t value within the range of weight 1.000-0.001), selecting an initial t value corresponding to the maximum value of the gray level uniformity, taking the initial t value as a final weight coefficient t value used in the formula (2), and when adjusting the Wn value of each lamp bead subsequently, keeping the weight coefficient t value as a constant, and when the type of the lamp bead is changed, re-determining the weight coefficient t value according to the steps.

The rule of selecting t is performed through experiments, namely starting from 1.000 and ending at 0.001, and actually starting from 1.00 and ending at 0.01, and experiments show that when t is 0.07-0.08, the gray level uniformity is greater than 95%, so that the experiments are mainly performed by specially selecting from the interval of 0.07-0.08 (the selection of the t value in the interval can increase a certain selection density).

The utility model discloses can cooperate above-mentioned paper defect detection method based on even illumination of near field more make things convenient for more intelligent realization to the power of each LED lamp and the regulation control of LED lamp interval.

The above disclosure is only for a few specific embodiments of the present invention, however, the present invention is not limited to the embodiments, and any changes that can be considered by those skilled in the art shall fall within the protection scope of the present invention.

Claims

1. The detection light source device which is applied to near-field uniform illumination paper defect detection and is convenient to control comprises a supporting cross rod (2) arranged below detected paper (10), and is characterized in that a sliding rail (13) and a rack (4) are respectively arranged along the rod length of the supporting cross rod (2), a plurality of lamp holders (6) are connected onto the sliding rail (13) in a sliding manner, an LED lamp (5) used for paper defect detection illumination is arranged on each lamp holder (6), a stepping motor (8) is further fixed onto each lamp holder (6), a gear (9) is connected onto an output shaft of each stepping motor (8) in a shaft connecting manner, each gear (9) is meshed with the rack (4), and a distance measurement module (7) used for measuring the distance between each lamp holder (6) and the adjacent lamp holder (6) on the right side of each lamp holder (6) is arranged on the right side wall of each lamp holder (6); each LED lamp (5) is respectively and electrically connected with an LED lamp power adjusting device (16) and a power supply (15), and the LED lamp power adjusting device (16) is in signal connection with a controller (14); the controller (14) is also in signal connection with each stepping motor (8), the distance measuring module (7) and the touch setting screen (18).

2. The detection light source device convenient to control and applied to near-field uniform illumination paper defect detection as claimed in claim 1, wherein the LED lamp power adjusting device (16) comprises a plurality of power controllers (16-1) corresponding to the LED lamps (5) one by one, and each power controller (16-1) is electrically connected with the controller (14) and the corresponding LED lamp (5) respectively.

3. The controllable detection light source device applied to the near-field uniform illumination paper defect detection is characterized in that the power controller (16-1) is a rheostat which is connected in series between the corresponding LED lamp (5) and the power supply (15) and is in signal connection with the controller (14), and the output resistance value of the rheostat is controlled through the controller (14), so that the voltage value loaded on the corresponding LED lamp (5) is changed.

4. The controllable detection light source device applied to near-field uniform illumination paper defect detection as claimed in claim 1, wherein the distance measurement module (7) is an infrared distance measurement module or a laser distance measurement module.