CN211904057U - Low speckle line laser transmitter device - Google Patents
Low speckle line laser transmitter device Download PDFInfo
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- CN211904057U CN211904057U CN201921924620.9U CN201921924620U CN211904057U CN 211904057 U CN211904057 U CN 211904057U CN 201921924620 U CN201921924620 U CN 201921924620U CN 211904057 U CN211904057 U CN 211904057U
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- line laser
- laser
- low speckle
- transmitter device
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Abstract
The utility model relates to a low speckle line laser emitter device, including laser diode 1, aspherical lens 2, first spherical lens 3, diffusion piece 4, diaphragm 5, second spherical lens 6 and the powell prism 7 placed in proper order. Use the utility model discloses a whole luminance of image that line laser emitter device obtained is even, has eliminated the light and shade patch that the speckle produced, is favorable to subsequent algorithm to be handled, has increased the holistic measurement processing performance of system.
Description
Technical Field
The utility model relates to a machine vision non-contact detection field especially relates to a low speckle line laser emitter device.
Background
With the rapid development of manufacturing and processing industries and the continuous progress of modern detection technologies, the surface three-dimensional measurement technology of parts with complex morphologies gradually becomes the focus of research in the fields of industrial measurement and the like. The laser line structured light three-dimensional measurement mode with the advantages of high precision, easy expansion, strong robustness and the like becomes a leading-edge technology which has the widest application and the greatest development prospect in the field of machine vision non-contact detection.
The monocular or binocular laser line structured light three-dimensional detection system which is popular at present needs the laser line structured light and the detection camera to have good matching degree, so that accurate object scanning images can be obtained. When the detector adopts the area array camera, the thickness of the laser line formed by the laser line structured light in the working surface is required to be consistent, the laser line is convenient to correspond to the pixel units of the area array camera one by one, but in practice, due to the inherent coherence property of laser, irregular speckles appear on the formed laser line whole body, so that the power on the corresponding matched pixel array is randomly distributed, the local light and shade distortion of the obtained image is finally caused, and the scanning precision is reduced.
SUMMERY OF THE UTILITY MODEL
For the limitation and the defect of solving prior art existence, the utility model provides a low speckle line laser emitter device, including laser diode 1, aspherical lens 2, first spherical lens 3, diffusion piece 4, diaphragm 5, second spherical lens 6 and the powell prism 7 placed in proper order.
Preferably, the effective working distance of the low-speckle line laser emission device is 200mm-2000 mm.
Preferably, the laser diode 1 of the low speckle line laser emitting device has a wavelength range of 405nm-808nm and is fixed by a copper pipe seat with a fixing pin in a close fit manner.
Preferably, the aspheric lens 2 in the low speckle line laser emitting device collimates the emitted light beam of the laser diode 1.
Preferably, in the low-speckle-line laser emitting device, the first spherical lens 3, the diaphragm 5 and the second spherical lens 6 form a spatial filter device with a magnification of 1:1, and the spatial filter device is used for filtering a stray light background generated by the laser diode 1.
Preferably, the diffusion sheet 4 in the low-speckle-spot-line laser emitting device is driven by a motor, and rotates around the central axis when working, so that the spatial coherence of incident laser is destroyed, and the effect of eliminating laser speckles is achieved.
Preferably, the powell prism 7 in the low-speckle linear laser emitting device forms the incident beam into a linear laser with uniform brightness according to a specified fan angle.
The utility model has the advantages that: the obtained image has uniform overall brightness, light and dark patches generated by speckles are eliminated, subsequent algorithm processing is facilitated, and the overall measurement processing performance of the system is improved.
Drawings
For a clearer explanation of the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to these drawings without any creative effort.
Fig. 1 is an overall structural schematic diagram of a low-speckle-line laser transmitter device provided by an example of the present invention.
Fig. 2 is a three-dimensional structure diagram of a low-speckle-line laser transmitter device provided by an example of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following describes the present invention in detail with reference to the accompanying drawings.
Example (b):
the embodiment of the utility model provides a low speckle line laser emitter device, as shown in fig. 1, including laser diode 1, aspherical lens 2, first spherical lens 3, diffusion piece 4, diaphragm 5, second spherical lens 6 and the powell prism 7 placed in proper order.
In the embodiment of the present invention, the wavelength range of the laser diode 1 is 405nm to 808nm, and is not limited to a specific packaging form. In the specific implementation process, the correct installation direction of the laser diode 1 is selected, so that the slow axis direction of the emitted laser beam is consistent with the direction marked in the figure 1, the slow axis direction is closely matched and fixed with a copper pipe seat with a fixing pin, good heat dissipation is kept, the pipe seat is fixed on a bottom plate, and the pipe seat is fixed by quick-drying glue.
The aspheric lens 2 is an aspheric lens with positive focal power, and two surfaces of the aspheric lens are plated with corresponding anti-reflection medium films. In the specific implementation process, the aspheric lens 2 is fixed on the lens base by adopting ultraviolet glue, the plane of the lens faces the laser diode 1, the position of the aspheric lens 2 is adjusted along the central optical axis, the fast axis of the light beam emitted by the laser diode 1 is collimated, and then the lens base is fixed by dispensing.
The first spherical lens 3, the diaphragm 5 and the second spherical lens 6 form a spatial filter device with the magnification of 1:1, and the spatial filter device can effectively filter a stray light background generated by the laser diode 1. In the specific implementation process, the first spherical lens 3 is opposite to the second spherical lens 6 in plane, the first spherical lens and the second spherical lens are placed into a light path along a central optical axis, the distance between the two lenses is tuned to enable light beams to form a first laser convergence point at the centers of the two lenses, the light beams form a second convergence point at a certain position within 200mm-2000mm of a specified working distance after passing through the two lenses, then the diaphragm 5 is placed between the two lenses, the position of the diaphragm 5 is adjusted to enable a small hole of the diaphragm 5 to be just positioned at the first laser convergence point, and the laser power change is less than 20% before and after the diaphragm 5 is inserted. And observing the light spots of the second convergent point, wherein the energy is distributed in a Gaussian-like manner, and the background has no stray light.
The whole diffusion sheet 4 is circular, the thickness is less than or equal to 1mm, and the light beam passing rate can reach more than 90%. In the specific implementation process, the center of the diffusion sheet 4 is punched and is fixedly connected with the brushless motor, when the laser diode 1 emits light, the diffusion sheet 4 rotates around the central shaft under the driving of the motor, the spatial coherence of incident laser is damaged, and the effect of eliminating laser speckles is achieved.
The Bawell prism 7 is an optical device which can widen point laser spots with Gaussian energy distribution into spots with a certain fan angle and energy in the fan angle direction is approximately distributed in a flat top manner. In the specific implementation process, the powell prism 7 is placed close to the second spherical lens 6 along the central optical axis as shown in fig. 1, and the powell prism 7 is horizontally moved along the slow axis direction in fig. 1, so that the power of two ends of the obtained line laser taking the optical axis as the center is symmetrically and uniformly distributed, and finally the low-speckle line laser can be obtained at the working distance position.
By selecting the low speckle line laser transmitter and the common line laser transmitter which are formed by the structure in the embodiment, the contrast test is carried out in the same line structure light three-dimensional detection system. From the actual measurement effect diagram of the common line laser transmitter, it can be seen that light and dark patches in the image are randomly distributed, and the integral brightness uniformity is poor, so that the processing difficulty of a subsequent algorithm is increased, and the measurement accuracy is reduced. Compared with the prior art, the actual measurement effect of the low-speckle-line laser transmitter is that the overall brightness of the image is uniform, and the bright and dark patches generated by speckles almost disappear, so that the subsequent algorithm processing is facilitated, and the overall measurement processing performance of the system is improved.
It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (7)
1. A low speckle line laser transmitter device, comprising: the device comprises a laser diode (1), an aspheric lens (2), a first spherical lens (3), a diffusion sheet (4), a diaphragm (5), a second spherical lens (6) and a Powell prism (7) which are sequentially arranged.
2. The low speckle line laser transmitter device of claim 1, wherein: the effective working distance of the line laser emitting device is 200mm-2000 mm.
3. The low speckle line laser transmitter device of claim 1, wherein: the laser diode (1) in the line laser emitting device has a wavelength range of 405nm-808nm and is fixed by a copper pipe seat with a fixing pin in a matching way.
4. The low speckle line laser transmitter device of claim 1, wherein: the aspheric lens (2) in the line laser emitting device collimates the light beam emitted by the laser diode (1).
5. The low speckle line laser transmitter device of claim 1, wherein: a first spherical lens (3), a diaphragm (5) and a second spherical lens (6) in the linear laser emitting device form a spatial filter device with the magnification ratio of 1:1, and the spatial filter device is used for filtering a stray light background generated by a laser diode (1) in a self-contained mode.
6. The low speckle line laser transmitter device of claim 1, wherein: the diffusion sheet (4) in the line laser emitting device is driven by a motor, rotates around the central axis when in work, destroys the spatial coherence of incident laser and achieves the effect of eliminating laser speckles.
7. The low speckle line laser transmitter device of claim 1, wherein: the Bawell prism (7) in the line laser emitting device forms the incident beam into line laser with uniform brightness according to a specified fan angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921924620.9U CN211904057U (en) | 2019-11-09 | 2019-11-09 | Low speckle line laser transmitter device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921924620.9U CN211904057U (en) | 2019-11-09 | 2019-11-09 | Low speckle line laser transmitter device |
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| CN211904057U true CN211904057U (en) | 2020-11-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI762141B (en) * | 2021-01-05 | 2022-04-21 | 台達電子工業股份有限公司 | Laser despeckle device and operation method of the same |
| CN114721161A (en) * | 2021-01-05 | 2022-07-08 | 台达电子工业股份有限公司 | Laser spot eliminating device and operation method thereof |
-
2019
- 2019-11-09 CN CN201921924620.9U patent/CN211904057U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI762141B (en) * | 2021-01-05 | 2022-04-21 | 台達電子工業股份有限公司 | Laser despeckle device and operation method of the same |
| CN114721161A (en) * | 2021-01-05 | 2022-07-08 | 台达电子工业股份有限公司 | Laser spot eliminating device and operation method thereof |
| CN114721161B (en) * | 2021-01-05 | 2024-04-05 | 台达电子工业股份有限公司 | Laser spot eliminating device and operation method thereof |
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