CN115165089A - Rectangular uniform sheet light source debugging method and device - Google Patents
Rectangular uniform sheet light source debugging method and device Download PDFInfo
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Abstract
The invention provides a method and a device for debugging a rectangular uniform sheet light source, which are characterized in that the light power of a sub-laser is detected through a detection surface densely distributed with sensor units, an illuminated elliptical area of a single or a plurality of sub-lasers on the detection surface is converted into a corresponding rectangle with relative width and length, a plurality of sub-power areas are divided according to the heat absorbed by the illuminated area, each sub-power area displays average power, the average power is represented by numbers and block areas with different colors, and the sub-lasers and an optical system are adjusted through the displayed numbers and the colors. The invention can humanizedly display the relative width, length and power of the single or a plurality of sub-lasers in the illuminated area of the detection surface, improves the convenience of operators in the light source adjusting process, and realizes the rapid adjustment of the uniformity of the rectangular sheet light source.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a method and a device for debugging a rectangular uniform sheet light source.
Background
Planar Laser Induced Fluorescence (PLIF) is an optical detection technology widely applied to scalar field measurement in fluid, and the principle is that certain components in fluid are excited by Laser to emit Fluorescence, and a characteristic scalar field (a concentration field, a temperature field or a pH value field) in a range to be detected is obtained by detecting the distribution of Fluorescence intensity.
Planar laser is used as a light source of an induction laser sheet for PLIF measurement, and a cylindrical mirror is generally adopted to expand a single laser beam in the traditional technology. However, since the energy distribution of the cross section of the laser beam is not uniform, the laser beam can be expanded into a sheet light source only in space by adopting cylindrical mirror beam expansion, and the light intensity distribution cannot be changed. Although the Bawell prism can improve the light intensity distribution of the sheet light source to a certain extent, the central light intensity of the sheet light source obtained by the Bawell prism is weaker than that of the two sides, the light intensity uniformity is generally not more than 70%, and the high-uniformity optical path is shorter. Therefore, the above method still has a problem of non-uniform light intensity distribution.
Patent CN111579485A proposes a uniform sheet light source system composed of multiple (more than 5) sub-lasers side by side, which provides a good idea for development of uniform sheet light source. However, when the number of sub-lasers is large (more than 10), the adjustment of the light intensity uniformity of the rectangular laser sheet light source is a time-consuming and labor-consuming work in practical application, because the adjustment of the laser uniformity needs to rely on a laser power meter to detect the uniformity of the sheet light source, but most of the existing laser power meters are single-point testing methods, if the measuring points are too dense, the debugging process is too long, and if the measuring points are too few, the uniformity of the sheet light source cannot be ensured.
Disclosure of Invention
The purpose of the invention is: in view of the above-mentioned shortcomings in the background art, a solution for rapidly adjusting the uniformity of a sheet light source is provided.
In order to achieve the above object, the present invention provides a method for debugging a rectangular uniform sheet light source, which detects the optical power of a sub-laser through a detection surface densely distributed with sensor units, converts an illuminated elliptical area of a single or multiple sub-lasers on the detection surface into a corresponding rectangle with relative width and length, and divides multiple sub-power areas according to the heat absorbed by the illuminated area, each sub-power area displays an average power, the size of the average power is represented by different colors and/or numbers, and the sub-lasers and an optical system are adjusted through the displayed power.
Further, the block areas represented are darker in color as the power is higher.
Further, the detection surface is also provided in a rectangular shape.
Further, the area of the sub-power region is adjustable.
Further, the minimum area of the sub-power region comprises at least one sensor cell.
Further, adjusting the sub-lasers and the optical system includes adjusting power of the sub-lasers and adjusting position of the optical system.
The invention also provides a rectangular uniform sheet light source debugging device, which adopts the method and comprises a rectangular laser power detector, a power display and a signal transmission line, wherein the rectangular laser power detector is connected with the power display through the signal transmission line;
the rectangular laser power detector is provided with a rectangular detection surface, a plurality of sensor units are densely distributed on the detection surface, the sensor units transmit detected optical power signals to a power display, the power display can display the relative width and length of an illuminated area of the detection surface of a single or a plurality of sub-lasers, the rectangular schematic diagram is divided into a plurality of sub-power areas according to the power absorbed by the illuminated area, and the sub-power areas are represented by different colors and/or numbers according to the size of average power.
The scheme of the invention has the following beneficial effects:
the method and the device for debugging the rectangular uniform sheet light source can display the relative width and the length of a single or a plurality of sub-lasers in a detection surface illumination area, divide a rectangular schematic diagram on a power display into a plurality of sub-power areas according to the heat absorbed by the illumination area, and express the average power of the areas by different colors and numbers, so that an operator can adjust the power of the plurality of sub-lasers and the position of an optical system according to the position and the color of the rectangular schematic diagram on the power display, the convenience of light source adjustment is improved, and the rapid adjustment of the uniformity of the rectangular sheet light source is realized;
other advantages of the present invention will be described in detail in the detailed description that follows.
Drawings
FIG. 1 is a schematic view of a rectangular light source according to the present invention;
FIG. 2 is a schematic diagram of a Gaussian distribution of light intensity of a single laser source according to the present invention;
FIG. 3 is a schematic diagram of a single laser source according to the present invention;
FIG. 4 is a schematic diagram of a single laser power transition in the present invention;
FIG. 5 is a schematic diagram of a rectangular light source adjusting process according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention. Furthermore, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In describing the present invention, for the sake of simplicity of explanation, the method or rule is depicted and described as a series of acts that are not intended to be exhaustive or to limit the order of the acts. For example, the experimental procedures can be performed in various orders and/or simultaneously, and include other experimental procedures that are not described again. Moreover, not all illustrated steps may be required to implement a methodology or algorithm described herein. Those skilled in the art will recognize and appreciate that the methodologies and algorithms may be represented as a series of interrelated states via a state diagram or items.
The embodiment of the invention provides a debugging method of a rectangular uniform sheet light source, wherein the rectangular sheet light source consists of a plurality of sub lasers, and is shown in figure 1. Including a plurality of sub-lasers and a plurality of optical systems. The sub-lasers are used for generating and emitting laser beams, the laser beams are the same in wavelength, energy distribution of cross sections is Gaussian or quasi-Gaussian, light outlets of the sub-lasers are located in the same plane and are arranged at equal intervals, and connecting lines of the light outlets are perpendicular to the emitting direction of the laser beams. The optical systems correspond to the sub-lasers one by one, each optical system is arranged on a light path of a laser beam emitted by the corresponding sub-laser and is used for shaping the laser beam to form sub-fan-shaped sheet beams, the sub-fan-shaped sheet beams are overlapped in a preset area to form plane laser, and beam expansion angles and thicknesses of the sub-fan-shaped sheet beams are the same.
It can be understood that, in an ideal state, the plurality of sub-lasers generate and emit laser beams with the same wavelength, that is, the wavelengths of the laser beams emitted by the plurality of sub-lasers are the same, and it can be ensured that the beam frequencies of the sub-fan-shaped pieces corresponding to each sub-laser are the same, thereby ensuring the uniformity of the finally formed planar laser.
However, in practical applications, the initial laser beam parameters of the sub-lasers have deviations, and the positions of the sub-lasers and the optical systems also have deviations, and particularly, when the number of the sub-lasers and the corresponding optical systems is large, the generated rectangular light sources are not uniform, and the corresponding use purpose cannot be achieved, so that the sub-lasers and the corresponding optical systems need to be debugged.
For the rectangular sheet light source, the debugging device adopted by the invention comprises a rectangular laser power detector, a power display and a signal transmission line, wherein the rectangular laser power detector is connected with the power display through the signal transmission line.
After the detection surface of the rectangular laser power detector is irradiated by a single or a plurality of sub-lasers, the sensor units distributed on the detection surface transmit signals to a power display (the principle is the same as that of a conventional power meter, and the photoelectric conversion principle is not repeated), the relative width and length of the single or a plurality of sub-lasers in an illuminated area of the detection surface can be displayed on the power display, the rectangular schematic diagram on the power display is divided into a plurality of sub-power areas according to the heat absorbed by the illuminated area, and the sub-power areas are represented by different colors and numbers according to the average power of the areas. An operator can adjust the power of the plurality of sub-lasers, the position of the optical system and the like according to the position and the color of the rectangular schematic diagram on the power display, so that the uniformity of the rectangular sheet light source can be quickly adjusted.
Compared with the traditional single-point detection debugging mode, the method can not only display the power on the rectangular detection surface and show the power by each block area, but also calculate the standard deviation of the laser power of each block area and the like, and help operators to quickly modulate a uniform rectangular sheet light source.
By way of further illustration, the effect of each sub-laser illumination may be as shown in FIG. 5-a before the laser sheet source is not homogenized. According to the method, a rectangular laser power detector is provided according to the light source characteristics of the existing known single laser, such as the light intensity Gaussian distribution (shown in figure 2) of the single laser light source, the irradiation effect (shown in figure 3) of the single laser light source and the measurement principle of a laser power meter, after the multiple laser light sources irradiate the detection surface of the rectangular laser power detector, a sensor unit of the detection surface converts a certain irradiation area into an equivalent rectangle and displays the equivalent rectangle on a power display (shown in figure 5-b), the rectangle divides a plurality of sub-areas according to the detected heat quantity, each sub-area displays the average power of the area, the sub-areas are known to be symmetrical about the axis of the laser according to the light intensity distribution characteristics (shown in figure 4) of the single laser light source, the power distribution of the sub-areas is p-n, p-2, p-1, p1, p2 and pn, the sub-areas are divided into colors with different depths according to the power size, and the difference of the power can be observed more easily by an operator. Then, the operator can adjust the optical system of the sub-laser according to the relative position of each rectangular area in fig. 5-b, and can adjust the power of the sub-laser according to the color depth of each area, and the like, and when the rectangle on the display is adjusted from fig. 5-b to fig. 5-c, the adjustment of the rectangular sheet light source can be completed, and finally the rectangular sheet light source with better uniformity is shown in fig. 5-d.
Preferably, a darker color display may be used when the power is greater, facilitating operator observation of the power distribution.
It should be noted that, the more the number of divisions of the rectangular sub-area on the power display is, the more detailed and clear the display of the power is. Because the minimum area of the sub-power region at least comprises one sensor unit, it can be understood that when the sensor units on the detection surface of the rectangular laser power detector are distributed more densely, the detection precision of the rectangular laser power detector is higher, and the rectangular sheet light source can be debugged uniformly by an operator quickly.
After the method provided by the embodiment is adopted to complete debugging of the rectangular uniform sheet light source, the rectangular uniform sheet light source can be packaged in a box-shaped structure and used as a planar laser source for PLIF measurement and the like.
Based on the same inventive concept, the embodiment also provides a rectangular uniform sheet light source debugging device, which comprises a rectangular laser power detector, a power display and a signal transmission line, wherein the rectangular laser power detector is connected with the power display through the signal transmission line.
The rectangular laser power detector is provided with a rectangular detection surface, a plurality of sensor units are densely distributed on the detection surface, the sensor units transmit detected optical power signals to the power display, the power display can display the relative width and the length of a single or a plurality of sub-lasers in a detection surface illumination area, the rectangular schematic diagram is divided into a plurality of sub-power areas according to the heat absorbed by the illumination area, and the sub-power areas are represented by different colors according to the size of average power.
The area of the sub-power area which can be displayed by the power display is adjustable, and in order to ensure the display reasonability, the minimum area of the sub-power area at least comprises one sensor unit. When the sub-power region includes only one sensor unit, the power displayed by the sub-power region is the light power detected by the sensor unit. The minimum area of the sub-power region preferably comprises four sensor units, so that the power displayed in the region can be averaged by the measured values of the plurality of sensor units, and the accuracy is improved.
Certainly, the more the number of the sensor units is, the better, and the excessive sensor units improve the processing and manufacturing difficulty, the heat dissipation reliability and the like of the rectangular laser power detector.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A method for debugging a rectangular uniform sheet light source is characterized in that the light power of a sub-laser is detected through a detection surface densely distributed with sensor units, an oval area illuminated by the sub-laser or the sub-lasers on the detection surface is converted into a corresponding rectangle with relative width and length, a plurality of sub-power areas are divided according to the heat absorbed by the illuminated area, each sub-power area displays average power, the average power is represented by numbers and/or block areas with different colors, and the sub-lasers and an optical system are adjusted through the displayed power.
2. The debugging method of claim 1, wherein the block area represented by the method is darker when the power is higher.
3. The method for debugging a rectangular uniform sheet light source according to claim 1, wherein the detection surface is also configured to be rectangular.
4. The debugging method of claim 1, wherein the area of the sub-power region is adjustable.
5. The debugging method of claim 1, wherein the minimum area of the sub-power region comprises at least one sensor unit.
6. The method as claimed in claim 1, wherein the adjusting the sub-lasers and the optical system comprises adjusting power of the sub-lasers and adjusting position of the optical system.
7. A rectangular uniform sheet light source debugging device adopting the method of any one of claims 1 to 6, comprising a rectangular laser power detector, a power display and a signal transmission line, wherein the rectangular laser power detector is connected with the power display through the signal transmission line;
the rectangular laser power detector is provided with a rectangular detection surface, a plurality of sensor units are densely distributed on the detection surface, the sensor units transmit detected optical power signals to the power display, the power display can convert an illuminated elliptical area of a single or a plurality of sub lasers on the detection surface into a corresponding rectangle with relative width and length, the rectangular schematic diagram is divided into a plurality of sub power areas according to the heat absorbed by the illuminated area, and the sub power areas are represented by different colors and/or numbers according to the size of average power.
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| CN111579485A (en) * | 2020-05-27 | 2020-08-25 | 叶冠中 | Uniform sheet light source |
| CN112649090A (en) * | 2020-12-25 | 2021-04-13 | 西安隆基绿能建筑科技有限公司 | Irradiation correction method and device and computer storage medium |
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2022
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090109658A1 (en) * | 2007-10-26 | 2009-04-30 | Corporation For Laser Optics Research | Laser illuminated backlight for flat panel displays |
| CN101581770A (en) * | 2009-06-30 | 2009-11-18 | 上海半导体照明工程技术研究中心 | Method for testing lumen efficiency of LED lamps |
| US20140043350A1 (en) * | 2012-08-09 | 2014-02-13 | Canon Kabushiki Kaisha | Brightness calculating apparatus, control method for brightness calculating apparatus, and display apparatus |
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