Automatic calibration device for laser displacement sensor

Abstract

The utility model relates to the technical field of precision measurement and sensing, and discloses an automatic calibration device for a laser displacement sensor, which comprises a base, the upper surface of the base is provided with a mounting groove and a mounting hole which correspond to each other, and the upper surface of the base is provided with a linear calibration module, a light beam distribution calibration module and a sensor adaptive adjustment module. The linear calibration module comprises a high-precision displacement platform, and the displacement platform is fixed to the upper surface of the base. According to the automatic calibration device for the laser displacement sensor, the linearity calibration function and the light beam distribution calibration function of the laser displacement sensor are integrated, detection of two key indexes can be completed synchronously, calibration steps are reduced, the calibration efficiency is greatly improved, meanwhile, the high-precision displacement platform and the high-resolution CCD camera are matched with each other, and the calibration accuracy is improved. And in combination with an advanced data processing algorithm, high precision and reliability of a calibration result are ensured, and the measurement performance of the laser displacement sensor is effectively guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of precision measurement and sensing technology, specifically to an automated calibration device for a laser displacement sensor. Background Technology

[0002] Laser displacement sensors, with their high speed, high precision, and non-contact characteristics, are widely used in industrial automation for distance measurement, vibration measurement, and shape measurement, such as dispensing machine positioning, spindle runout measurement, workpiece size measurement, and geometric surface measurement. However, the nonlinearity of the internal emitting and receiving mirror groups and the CMOS sensor can cause nonlinear deviations in the measurement data, affecting measurement accuracy and performance. Therefore, precise calibration of the linearity and beam distribution of the laser displacement sensor is crucial.

[0003] Current calibration equipment has significant shortcomings in use. It can only perform linear calibration at a time and cannot simultaneously analyze the shape of the laser beam, resulting in low calibration efficiency and difficulty in meeting production needs. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides an automated calibration device for laser displacement sensors, which has the advantage of high calibration efficiency and solves the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an automated calibration device for a laser displacement sensor, comprising a base, wherein the upper surface of the base is provided with corresponding mounting grooves and mounting holes, and the upper surface of the base is provided with a linear calibration module, a beam distribution calibration module and a sensor adaptive adjustment module;

[0006] The linear calibration module includes a high-precision displacement platform, which is fixed to the upper surface of the base. A slider is slidably connected to the inner wall of the displacement platform, and a bearing block is fixed to the upper surface of the slider. A reflective target is rotatably connected to the inner wall of the bearing block through a small motor.

[0007] Furthermore, the surface of the reflective target is coated with a high-reflectivity film.

[0008] Through the above scheme, the high reflectivity film layer can make the flatness of the reflective surface of the reflective target reach the sub-micron level with high reflectivity consistency, which can ensure the stability and accuracy of the reflected laser beam.

[0009] Furthermore, the linear calibration module also includes a displacement control motor, the output end of which is equipped with a threaded rod, which is threadedly connected to the slider, and the displacement control motor is electrically connected to an external control device.

[0010] The above scheme uses a displacement control motor that receives control from an external control device to drive the slider to make precise displacement.

[0011] Furthermore, the beam distribution calibration module includes a high-resolution CCD camera, which is mounted on the other side of the base.

[0012] Through the above scheme, the CCD camera has high sensitivity and high frame rate characteristics, which can quickly capture the laser beam spot image emitted by the laser displacement sensor. At the same time, its built-in optical lens group can magnify and correct the spot, ensuring the clarity and accuracy of the acquired image.

[0013] Furthermore, the beam distribution calibration module also includes an image analysis unit connected to a CCD camera.

[0014] Through the above scheme, the image analysis unit has a built-in image processing algorithm that can analyze the acquired light spot image and obtain parameters such as the intensity distribution, shape, and center position of the laser beam, which can be used to evaluate the distribution characteristics of the laser beam.

[0015] Furthermore, the sensor adaptive adjustment module includes a bracket fixed to the upper surface of the base, and the inner wall of the bracket is rotatably connected to a support seat via a small motor. The upper surface of the support seat is equipped with a laser displacement sensor body.

[0016] With the above solution, during use, an external control device controls the rotation of a small motor to drive the carrier to rotate. At the same time, the rotation of the reflective target corrects the deviation of the light after the reflective target is displaced, so that the light can always stably illuminate the lens of the CCD camera.

[0017] Furthermore, a multi-channel data acquisition card is installed on the side of the bracket. The multi-channel data acquisition card is connected to the laser displacement sensor and the image analysis unit via cables, and the multi-channel data acquisition card is connected to an external control device.

[0018] Using the above method, the multi-channel data acquisition card can simultaneously acquire measurement data from the laser displacement sensor and image data from the beam acquisition component.

[0019] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0020] This automated calibration device for laser displacement sensors integrates the linearity calibration and beam distribution calibration functions of laser displacement sensors into one unit, enabling simultaneous detection of two key indicators. This reduces calibration steps and greatly improves calibration efficiency. Furthermore, it employs a high-precision displacement platform and a high-resolution CCD camera in conjunction with advanced data processing algorithms to ensure high accuracy and reliability of calibration results, effectively guaranteeing the measurement performance of the laser displacement sensor. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present application;

[0022] Figure 2 This is a schematic diagram illustrating the overall working status of this application;

[0023] Figure 3 This is a sectional view of the side view of the overall displacement platform of this application;

[0024] Figure 4 This is a sectional view of the overall base side view of this application.

[0025] In the picture:

[0026] 1. Base;

[0027] 2. Linear calibration module; 201. Displacement platform; 202. Slider; 203. Bearing block; 204. Reflecting target; 205. Displacement control motor; 206. Threaded rod;

[0028] 3. Beam distribution calibration module; 301. CCD camera; 302. Image analysis unit;

[0029] 4. Sensor adaptive adjustment module; 401. Bracket; 402. Support base; 403. Laser displacement sensor body;

[0030] 5. Multi-channel data acquisition card. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] Please see Figure 1 , Figure 2 and Figure 3 An automated calibration device for a laser displacement sensor in this embodiment includes a base 1. The upper surface of the base 1 is provided with corresponding mounting grooves and mounting holes. The upper surface of the base 1 is provided with a linear calibration module 2, a beam distribution calibration module 3, and a sensor adaptive adjustment module 4. The linear calibration module 2 includes a high-precision displacement platform 201, which is fixed to the upper surface of the base 1. A slider 202 is slidably connected to the inner wall of the displacement platform 201. A bearing block 203 is fixed to the upper surface of the slider 202. A reflective target 204 is rotatably connected to the inner wall of the bearing block 203 through a small motor.

[0033] Please see Figure 2 , Figure 3 and Figure 4 The surface of the reflective target 204 is coated with a high reflectivity film. The high reflectivity film enables the reflective surface of the reflective target 204 to achieve sub-micron level flatness and high reflectivity consistency, which can ensure the stability and accuracy of the reflected laser beam. The linear calibration module 2 also includes a displacement control motor 205. The output end of the displacement control motor 205 is equipped with a threaded rod 206, which is threadedly connected to the slider 202. The displacement control motor 205 is electrically connected to an external control device. The displacement control motor 205 receives control from the external control device and drives the slider 202 to perform precise displacement.

[0034] Please see Figure 2 , Figure 3 and Figure 4 The beam distribution calibration module 3 includes a high-resolution CCD camera 301, which is mounted on the other side of the base 1. The CCD camera 301 has high sensitivity and high frame rate characteristics, and can quickly capture the laser beam spot image emitted by the laser displacement sensor. At the same time, its built-in optical lens group can magnify and correct the spot to ensure the clarity and accuracy of the acquired image. The beam distribution calibration module 3 also includes an image analysis unit 302 connected to the CCD camera 301. The image analysis unit 302 has built-in image processing algorithms, which can analyze the acquired spot image to obtain parameters such as the intensity distribution, shape, and center position of the laser beam for evaluating the distribution characteristics of the laser beam.

[0035] Please see Figure 2 , Figure 3 and Figure 4 The sensor adaptive adjustment module 4 includes a bracket 401 fixed to the upper surface of the base 1. The inner wall of the bracket 401 is rotatably connected to a carrier 402 via a small motor. The upper surface of the carrier 402 is equipped with a laser displacement sensor body 403. In use, the small motor is controlled by an external control device to rotate, thereby driving the carrier 402 to rotate. At the same time, in conjunction with the rotation of the reflective target 204, the offset of the light after the displacement of the reflective target 204 is corrected, so that the light can always stably illuminate the lens of the CCD camera 301. A multi-channel data acquisition card 5 is installed on the side of the bracket 401. The multi-channel data acquisition card 5 is connected to the laser displacement sensor and the image analysis unit 302 via cables. The multi-channel data acquisition card 5 is connected to an external control device. The multi-channel data acquisition card 5 can simultaneously acquire the measurement data of the laser displacement sensor and the image data of the beam acquisition component.

[0036] It should be noted that before use, according to the shape and range of the laser displacement sensor to be calibrated, the rotating rod is controlled by an external control device to adjust the angle between the reflective target 204 and the laser displacement sensor body 403, so as to ensure that the light beam reflected by the reflective target 204 can illuminate the lens of the CCD camera 301 from the beginning.

[0037] The working principle of the above embodiment is as follows: The operator inputs the sensor model, range and other basic parameters into the external control device, and controls the displacement control motor 205 through the external control device, so that it drives the slider 202 to move and then drives the support block 203 to move. The reflective target 204 moves to the designated position. When it stops at each position, the multi-channel data acquisition card 5 synchronously acquires the measurement data of the laser displacement sensor and the standard displacement data of the slider 202.

[0038] Meanwhile, the CCD camera 301 of the beam distribution calibration module 3 captures the laser beam spot image emitted by the laser displacement sensor in real time. After being magnified and corrected by its own optical lens group, the image data is transmitted to the image analysis unit 302. The image analysis unit 302 processes the spot image, obtains the distribution parameters of the laser beam, and transmits the results to the multi-channel data acquisition card 5.

[0039] The external control device aggregates the data information from the multi-channel data acquisition card 5. For linearity calibration data, it calculates the nonlinear error of the sensor by comparing the measured value of the laser displacement sensor with the standard displacement value and generates a linear calibration curve. For beam distribution data, it evaluates the distribution performance of the laser beam based on the image analysis results and generates a detailed analysis report. By integrating the linearity calibration and beam distribution calibration functions of the laser displacement sensor into one, it can simultaneously complete the detection of two key indicators, reduce calibration steps, and greatly improve calibration efficiency. At the same time, it uses a high-precision displacement platform 201 and a high-resolution CCD camera 301 in cooperation with advanced data processing algorithms to ensure the high accuracy and reliability of the calibration results, effectively guaranteeing the measurement performance of the laser displacement sensor.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0041] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A laser displacement sensor automated calibration device comprising a base (1), characterized in that: The upper surface of the base (1) is provided with corresponding mounting grooves and mounting holes, and the upper surface of the base (1) is provided with a linear calibration module (2), a beam distribution calibration module (3) and a sensor adaptive adjustment module (4). The linear calibration module (2) includes a high-precision displacement platform (201), which is fixed to the upper surface of the base (1). A slider (202) is slidably connected to the inner wall of the displacement platform (201), and a bearing block (203) is fixed to the upper surface of the slider (202). A reflective target (204) is rotatably connected to the inner wall of the bearing block (203) through a small motor.

2. The apparatus of claim 1, wherein: The surface of the reflective target (204) is coated with a high reflectivity film.

3. The apparatus of claim 1, wherein: The linear calibration module (2) further includes a displacement control motor (205), the output end of which is equipped with a threaded rod (206), the threaded rod (206) is threadedly connected to the slider (202), and the displacement control motor (205) is electrically connected to an external control device.

4. The apparatus of claim 1, wherein: The beam distribution calibration module (3) includes a high-resolution CCD camera (301), which is mounted on the other side of the base (1).

5. The apparatus of claim 1, wherein: The beam distribution calibration module (3) also includes an image analysis unit (302) connected to the CCD camera (301).

6. The apparatus of claim 1, wherein: The sensor adaptive adjustment module (4) includes a bracket (401) fixed to the upper surface of the base (1). The inner wall of the bracket (401) is rotatably connected to a carrier (402) by a small motor. The upper surface of the carrier (402) is equipped with a laser displacement sensor body (403).

7. The apparatus of claim 6, wherein: A multi-channel data acquisition card (5) is installed on the side of the bracket (401). The multi-channel data acquisition card (5) is connected to the laser displacement sensor and the image analysis unit (302) via cables. The multi-channel data acquisition card (5) is also connected to an external control device.

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