Building surface scanning device based on stripe structure light projection

Abstract

The utility model discloses a building surface scanning device based on stripe structure light projection. The building surface scanning device comprises a double-fiber interference fringe projector and a CCD industrial camera. The double-fiber interference fringe projector projects interference fringe patterns to the to-be-measured surface of the building, and the CCD industrial camera collects the distorted interference fringe patterns on the to-be-measured surface of the building; the double-optical-fiber interference fringe projector comprises a laser, a coupling lens group, an optical fiber patch cord, an optical splitter and an optical fiber pigtail. A light beam emitted by the laser is concentrated to the input end of the optical fiber patch cord through the coupling lens group and enters the optical splitter through the optical fiber patch cord, the optical splitter evenly splits the light beam into two light beams with the same wavelength and then emits the light beams through the two optical fiber pigtails, and an interference fringe pattern is formed on the to-be-measured surface of a building. According to the utility model, the depth change of the building surface can be accurately reflected, a large amount of image data does not need to be stored, the requirement on the storage space is reduced, and the device is lighter and more efficient.

Description

Technical Field

[0001] The utility model belongs to the technical field of three-dimensional surface measurement of buildings, and in particular relates to a building surface scanning device based on stripe structured light projection. Background Art

[0002] In building quality inspection, accurate measurement of building surface topography is crucial for evaluating building safety, surface flatness, construction quality, etc.

[0003] Existing three-dimensional surface detection technologies for buildings include: three-dimensional surface measurement technology based on digital light processing (DLP) and three-dimensional surface measurement technology based on line structured light.

[0004] 3D surface reconstruction technology based on digital light processing uses a computer to generate digital fringe images to detect object depth information. However, the resolution and projection range of the projector significantly affect measurement accuracy. Furthermore, the nonlinear relationship between the projector's supply voltage and brightness can cause measurement errors, resulting in the detection system being unable to accurately reflect information such as cracks on a building's surface. 3D surface measurement technology based on line structured light requires a large amount of storage space, and vibration significantly affects measurement results. Summary of the Invention

[0005] To address the aforementioned issues with existing technologies, the present invention provides a building surface scanning device based on fringe structured light projection. This device utilizes a dual-fiber interference fringe projector to project a high-precision interference fringe pattern onto the building surface, accurately reflecting depth variations on the building surface. This device eliminates the need to store large amounts of image data, reducing storage space requirements and making the device more lightweight and efficient. The present dual-fiber interference fringe projector boasts a compact structure, a stable interference fringe projection process, and reduced interference from external vibrations on the scanning results.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A building surface scanning device based on fringe structured light projection includes a dual-fiber interference fringe projector and a CCD industrial camera. The dual-fiber interference fringe projector projects an interference fringe pattern onto the building surface to be measured, and the CCD industrial camera collects the distorted interference fringe pattern on the building surface to be measured. The dual-fiber interference fringe projector includes a laser, a coupling lens group, an optical fiber jumper, a beam splitter, and an optical fiber pigtail. The light beam emitted by the laser is concentrated to the input end of the optical fiber jumper through the coupling lens group and enters the beam splitter through the optical fiber jumper. The beam splitter evenly splits the light beam into two beams of equal wavelength and emits them through two optical fiber pigtails, forming an interference fringe pattern on the building surface to be measured.

[0008] Furthermore, the laser adopts an adjustable frequency-stabilized laser light source.

[0009] Furthermore, the laser emits 650nm red light.

[0010] Furthermore, the optical fiber jumper is a single-mode optical fiber jumper.

[0011] Furthermore, the output ends of the two optical fiber pigtails are fixed by ceramic fixing terminals.

[0012] The utility model has the following advantages:

[0013] The utility model provides a building surface scanning device based on stripe structured light projection, which adopts a dual-fiber interference fringe projector and utilizes the advantages of laser scanning to project high-precision interference fringe patterns on the building surface, which can accurately reflect the depth changes of the building surface.

[0014] The utility model has a double-fiber interference fringe projector with a compact structure, a stable interference fringe projection process, and reduces the interference of external vibration on the scanning result.

[0015] The utility model does not need to store a large amount of image data, reduces the demand for storage space, and makes the device more lightweight and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings to be used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0017] Figure 1 This is a schematic structural diagram of a building surface scanning device based on stripe structured light projection according to an embodiment of the present utility model;

[0018] Figure 2 This is a schematic structural diagram of the dual-fiber interference fringe projector described in an embodiment of the present utility model;

[0019] Figure 3 Schematic diagram of the dual-fiber interference fringe projection principle;

[0020] 1-Dual fiber interference fringe projector; 2-CCD industrial camera. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0022] Example

[0023] This embodiment is a building surface scanning device based on stripe structured light projection, such as Figure 1 As shown, it includes a dual-fiber interference fringe projector 1 and a CCD industrial camera 2; the dual-fiber interference fringe projector 1 projects interference fringe patterns onto the surface of the building to be measured, and the CCD industrial camera 2 collects the distorted interference fringe patterns on the surface of the building to be measured.

[0024] like Figure 2 As shown, the dual-fiber interference fringe projector 1 includes a laser, a coupling lens group, a fiber jumper, a beam splitter, and a fiber pigtail. The laser emits 650nm red light, which is concentrated to the input end of the fiber jumper through the coupling lens group and enters the beam splitter through the fiber jumper. The beam splitter evenly splits the light into two beams of equal wavelength and then emits them through two fiber pigtails, forming an interference fringe pattern on the surface of the building to be measured.

[0025] In this embodiment, the laser adopts an adjustable frequency-stabilized laser light source.

[0026] In this embodiment, the optical fiber jumper is a single-mode optical fiber jumper.

[0027] In this embodiment, the output ends of the two optical fiber pigtails are fixed by ceramic fixing terminals.

[0028] The following is a brief introduction to the working principle of this utility model:

[0029] The dual-fiber interference fringe projector uses an adjustable frequency-stabilized laser light source to emit 650nm red light to form interference fringe patterns. The light beam from the laser light source is concentrated to the input end of the single-mode fiber jumper through a coupling lens group, and then enters the beam splitter through the single-mode fiber jumper. The beam splitter evenly splits the light beam into two beams of equal wavelength and emits them through the output ends of the two fiber tails. Figure 3 As shown, the two laser beams interfere with each other and form an interference fringe pattern on the surface of the building to be measured;

[0030] Due to the different depths of the building's surface to be measured, the phase φ of each point on the interference fringe pattern is different, resulting in a distorted interference fringe pattern. The distorted interference fringe pattern of the surface to be measured is photographed by a CCD industrial camera to complete the scanning of the building's surface to be measured.

[0031] The CCD industrial camera can further transmit the collected pattern to the host computer or microcontroller to calculate the three-dimensional morphology of the surface to be measured.

[0032] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A building surface scanning device based on stripe structured light projection, characterized in that: It includes a dual-fiber interference fringe projector and a CCD industrial camera; the dual-fiber interference fringe projector projects interference fringe patterns onto the surface of the building to be tested, and the CCD industrial camera collects the distorted interference fringe patterns on the surface of the building to be tested; The dual-fiber interference fringe projector includes a laser, a coupling lens group, a fiber jumper, a beam splitter, and a fiber pigtail. The light beam emitted by the laser is concentrated to the input end of the fiber jumper through the coupling lens group, and enters the beam splitter through the fiber line. The beam splitter evenly splits the light beam into two beams of equal wavelength and then emits them through two fiber pigtails, forming an interference fringe pattern on the surface of the building to be measured.

2. The building surface scanning device based on stripe structured light projection according to claim 1, characterized in that: The laser adopts an adjustable frequency-stabilized laser light source.

3. The building surface scanning device based on stripe structured light projection according to claim 1, characterized in that: The laser emits 650 nm red light.

4. The building surface scanning device based on stripe structured light projection according to claim 1, characterized in that: The optical fiber jumper is a single-mode optical fiber jumper.

5. The building surface scanning device based on stripe structured light projection according to claim 1, characterized in that: The output ends of the two optical fiber pigtails are fixed by ceramic fixing terminals.

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