An adaptive multi-path collaborative scanning optical coherence tomography three-dimensional imaging device

Abstract

The application provides an adaptive multi-light-path cooperative scanning optical coherence tomography three-dimensional imaging device, and belongs to the field of distributed optical fiber sensing; the device comprises a broadband low-coherence light source, an optical isolator, a fiber coupler, a reference arm, a sample arm and a detection arm; three light paths using the same set of interference devices and without light signal aliasing are arranged in the sample arm; the on-off of the three light paths is controlled by respective timers; three sample reflection lights of a target scanning object are obtained; the three sample reflection lights are reflected back to the fiber coupler and the light of the reference arm to interfere; the light after interference enters the detection arm to be calculated; the application overcomes the deficiency of the single-beam serial scanning optical coherence tomography imaging system in imaging speed, while ensuring that the complexity of the light path structure is relatively simple; through introducing a multi-light-path parallel structure and an optical path difference coding mechanism under a single interference detection architecture, frequency domain separation and synchronous tomographic acquisition of multiple detection lights are realized.

Description

Technical Field

[0001] This application relates to the field of optical coherence tomography technology, and in particular to an adaptive multi-path cooperative scanning optical coherence tomography three-dimensional imaging device. Background Technology

[0002] In the field of industrial imaging, including ultrasonic-based acoustic imaging and X-ray-based digital imaging, ultrasonic imaging has sufficient imaging depth but insufficient imaging resolution. X-ray imaging has sufficient imaging resolution and depth, but the imaging effect will not meet expectations when the imaging target does not have sufficient density or is not a specific material. The optical coherence tomography (OCT) technology involved in this application is a high-resolution tomographic imaging method based on the principle of low coherence interference. It is a three-dimensional tomographic imaging technology that has been gradually developed in recent years. This technology fills the gap between confocal microscopy and ultrasonic imaging, combining the advantages of both depth and high resolution. Especially in the detection of micron-level structures and real-time dynamic monitoring, OCT technology has become an important technical means in the field of precision inspection due to its non-contact, high sensitivity, and high axial resolution. However, the efficiency of existing lateral scanning methods is limited by the A-scan sampling rate, resulting in low time utilization of point-by-point acquisition and a scanning bottleneck in time-sensitive scenarios such as high-speed industrial inspection. Therefore, improving information acquisition efficiency is a practical need to increase the speed of OCT and an urgent need to ensure that it can adapt to more complex scenarios in the industrial field.

[0003] With the ever-increasing imaging demands of high-speed industrial inspection, single-path serial scanning structures are no longer sufficient to balance high resolution and high speed. While existing research has proposed using multiple probe channels or multiple interferometric systems for parallel acquisition, these solutions typically require additional spectrometers or interferometric detection modules, leading to system complexity, increased cost, and difficulty in ensuring phase stability. Furthermore, the synchronous control between multiple channels further complicates implementation. Therefore, multi-beam parallel tomographic acquisition within a single interferometric system architecture has found its application. This architecture allows for the simultaneous acquisition of internal XYZ axis information of an object by placing different probes. However, in a single interferometric system architecture, interference signals between different beams cannot be effectively distinguished, resulting in spectral overlap or aliasing, affecting image quality and signal-to-noise ratio. Therefore, the key challenge in realizing this structure is achieving multi-path collaborative scanning and parallel tomographic acquisition without significantly increasing system complexity, while effectively distinguishing the tomographic information corresponding to different optical paths. Summary of the Invention

[0004] This application proposes an adaptive multi-optical-path collaborative scanning optical coherence tomography three-dimensional imaging device. Its purpose is to overcome the shortcomings of single-beam serial scanning optical coherence tomography imaging system in terms of imaging speed, while ensuring that the optical path structure is relatively simple. By introducing a multi-optical-path parallel structure and optical path difference coding mechanism under a single interferometric detection architecture, frequency domain separation and synchronous tomographic acquisition of multiple probe beams are realized.

[0005] The technical solution adopted in this application is as follows: an adaptive multi-optical-path collaborative scanning optical coherence tomography three-dimensional imaging device, including a broadband low-coherence light source, an optical isolator, a 2×2 fiber coupler, a second polarization controller, a reference arm, a sample arm, and a probe arm. The continuous light emitted by the broadband low-coherence light source is split into two paths by the 2×2 fiber coupler after passing through the optical isolator. One path enters the reference arm, and the other path enters the sample arm after passing through the second polarization controller. The reference arm is used to provide a standard reference light for the beam of the sample arm. The sample arm is equipped with three beams of light that use the same set of interferometry equipment and whose optical signals do not overlap. The on / off state of the three beams of light is controlled by their respective timers to obtain three beams of sample reflected light from the target scanned object. The three beams of sample reflected light are then reflected back to the 2×2 fiber coupler and the light from the reference arm to interfere. The interfered light enters the probe arm for signal processing to obtain a three-dimensional stereoscopic image of the target scanned object.

[0006] Furthermore, the reference arm includes a first fiber attenuator, a first polarization controller, a first fiber collimator, a first lens, and a reference mirror. The output end of the 2×2 fiber coupler is connected to the input end of the first fiber attenuator; the output end of the first fiber attenuator is connected to the input end of the first polarization controller; the output end of the first polarization controller is connected to the input end of the first fiber collimator; the output end of the first fiber collimator is connected to the input end of the first lens, and the output end of the first lens illuminates the reference mirror.

[0007] Furthermore, the sample arm includes a 1×3 fiber beam splitter, a first timer, a second timer, a third timer, a second fiber attenuator, a third fiber attenuator, a fourth fiber attenuator, a first MEMS scanning mirror, a second MEMS scanning mirror, a third MEMS scanning mirror, a first probe, a second probe, a third probe, a first moving servo motor, a second moving servo motor, and a third moving servo motor; The output of the second polarization controller is connected to the input of the 1×3 fiber beam splitter; the output of the 1×3 fiber beam splitter is connected to the input of the first timer; the output of the first timer is connected to the input of the second fiber attenuator; the output of the second fiber attenuator is connected to the first MEMS scanning mirror; the first MEMS scanning mirror is connected to the first probe; and the first moving servo motor is connected to the first probe. The output of the 1×3 fiber optic beam splitter is connected to the input of the second timer; the output of the second timer is connected to the input of the third fiber optic attenuator; the output of the third fiber optic attenuator is connected to the second MEMS scanning mirror; the second MEMS scanning mirror is connected to the second probe; and the second motion servo motor is connected to the second probe. The output of the 1×3 fiber optic beam splitter is connected to the input of the third timer; the output of the third timer is connected to the input of the fourth fiber optic attenuator; the output of the fourth fiber optic attenuator is connected to the third MEMS scanning mirror; the third MEMS scanning mirror is connected to the third probe; and the third motion servo motor is connected to the third probe.

[0008] Furthermore, the sample arm is equipped with a sample holder, which consists of a movable track and a square frame.

[0009] Furthermore, the first moving servo motor and the first probe, which are interconnected, are simultaneously mounted on a movable track to scan the object depth information along the entire X-axis. The second moving servo motor and the second probe, which are connected to each other, are simultaneously mounted on the movable track to scan the object depth information along the entire Y-axis. The third motion servo motor and the third probe, which are connected to each other, are simultaneously mounted on a movable track to scan the object depth information along the entire Z-axis.

[0010] Furthermore, the probe arm includes a second fiber collimator, a diffraction grating, a second lens, a CCD camera, a data acquisition and processing card, and a PC. The output end of the 2×2 fiber coupler is connected to the input end of the second fiber collimator; the output end of the second fiber collimator is connected to the input end of the diffraction grating; the output end of the diffraction grating is connected to the second lens; the second lens is connected to the input end of the CCD camera; the output end of the CCD camera is connected to the data acquisition and processing card, which is used to first distinguish the wavelength and phase data of the acquired light along different optical paths of the X, Y, and Z axes, and then process the data from different paths collaboratively; the data acquisition and processing card is connected to the PC, where the processed X, Y, and Z data is used to generate a three-dimensional stereoscopic image of the target scanned object.

[0011] Furthermore, the broadband low-coherence light source outputs continuous light with a wavelength of 820~860nm.

[0012] Furthermore, the on / off state of the three light paths is controlled by corresponding timers. Under a single time unit, the time is divided into three parts and labeled. The time of label 1 only allows the first light path to pass through, the time of label 2 only allows the second light path to pass through, and the time of label 3 only allows the third light path to pass through, thus labeling each light path to distinguish different samples.

[0013] The advantages of this application over the prior art are as follows: I. This application, within a single interferometric detection module architecture, utilizes optical path difference coding and time multiplexing mechanisms to achieve parallel tomographic acquisition of multiple sample beams. By dividing the unit time element in each sample optical path, the interference signals corresponding to different beams are given different time labels, forming mutually separated time windows in the frequency domain. This allows for simultaneous acquisition of multiple A-scans within a single OCT optical path device, achieving the effect equivalent to multiple optical path devices and channels. This structure avoids the hardware redundancy and complex phase synchronization issues of traditional multi-channel systems, significantly reducing system complexity and cost, and improving overall structural stability and integration.

[0014] II. This application achieves multi-point lateral synchronous scanning through a multi-path beam splitting structure and a shared reference arm design. Multiple sample beams share the same reference beam and interferometric detection module, enabling simultaneous acquisition of depth information from multiple spatial locations during lateral scanning, thereby effectively improving lateral sampling efficiency. Under the same light source power and detection rate conditions, the system's imaging efficiency is improved, achieving high-speed imaging without compromising axial resolution.

[0015] Third, this application maximizes the acquisition efficiency of three-way sample light by reasonably allocating the time window and introducing multiple sample lights to share the same interference detection module. By scanning the X, Y and Z axes simultaneously, it can achieve three-dimensional imaging of objects while ensuring imaging efficiency and accuracy. Furthermore, it can collect all internal information of transparent objects and achieve high-precision reconstruction of the object contour while realizing 2mm depth imaging of the object for opaque objects.

[0016] Fourth, the introduced movable servo motor enables fully electronic control of probe movement, avoiding artifacts caused by handheld probe scanning, and enabling precise control of minute distance movements. Attached Figure Description

[0017] The following description, in conjunction with the accompanying drawings, further illustrates this application: Figure 1 A schematic diagram of the structure of the adaptive multi-path cooperative scanning optical coherence tomography three-dimensional imaging device provided in the embodiments of this application; In the figure: 1 is a broadband low-coherence light source, 2 is an optical isolator, 3 is a 2×2 fiber coupler, 4 is a first fiber attenuator, 5 is a first polarization controller, 6 is a first fiber collimator, 7 is a first lens, 8 is a reference mirror, 9 is a second polarization controller, 10 is a 1×3 fiber beam splitter, 11 is a first timer, 12 is a second timer, 13 is a third timer, 14 is a second fiber attenuator, 15 is a third fiber attenuator, 16 is a fourth fiber attenuator, 17 is a first MEMS scanning mirror, 18 is a second MEMS scanning mirror, 1 9 is the third MEMS scanning galvanometer, 20 is the first probe, 21 is the second probe, 22 is the third probe, 23 is the first moving servo motor, 24 is the second moving servo motor, 25 is the third moving servo motor, 26 is the movable track, 27 is the square frame, 28 is the probe XYZ position diagram, 29 is the second fiber collimator, 30 is the diffraction grating, 31 is the second lens, 32 is the CCD camera, 33 is the data acquisition and processing card, 34 is the PC terminal, 35 is the reference arm, 36 is the sample holder, 37 is the sample arm, and 38 is the probe arm. Detailed Implementation

[0018] like Figure 1 As shown, this application provides an adaptive multi-path cooperative scanning optical coherence tomography three-dimensional imaging device, including a broadband low-coherence light source 1, an optical isolator 2, a 2×2 fiber coupler 3, a second polarization controller 9, a reference arm 35, a sample arm 37, and a probe arm. The reference arm 35 includes a first fiber attenuator 4, a first polarization controller 5, a first fiber collimator 6, a first lens 7, and a reference mirror 8. The sample arm 37 includes a 1×3 fiber beam splitter 10, a first timer 11, a second timer 12, and a third timer 13. The system includes a second fiber optic attenuator 14, a third fiber optic attenuator 15, a fourth fiber optic attenuator 16, a first MEMS scanning mirror 17, a second MEMS scanning mirror 18, a third MEMS scanning mirror 19, a first probe 20, a second probe 21, a third probe 22, a first moving servo motor 23, a second moving servo motor 24, and a third moving servo motor 25. The probe arm 38 includes a second fiber optic collimator 29, a diffraction grating 30, a second lens 31, a CCD camera 32, a data acquisition and processing card 33, and a PC terminal 34. The sample arm 37 is equipped with a sample holder 36 for placing arbitrary target scanning samples. The sample holder 36 consists of a movable track 26 and a square frame 27, used to place the target scanning object. The probe XYZ axis position diagram 28 includes three XYZ surfaces, allowing the three probes to move along corresponding axes.

[0019] A broadband low-coherence light source 1 outputs continuous light with a wavelength of 820~860nm, which is connected to the input of an optical isolator 2. The isolator 2 allows the light source to pass through in one direction only. The output of the optical isolator 2 is connected to the input of a 2×2 fiber coupler 3. The output of the 2×2 fiber coupler 3 is connected to the input of a first fiber attenuator 4. The first fiber attenuator 4 matches the intensity of the laser light to the reference arm 35 to obtain the best interference contrast. The output of the first fiber attenuator 4 is connected to the input of a first polarization controller 5. The first polarization controller 5 is used to adjust the polarization state of the light to ensure the interference intensity of the light. The output of the first polarization controller 5 is connected to the input of a first fiber collimator 6 to ensure that the laser is parallel. The output of the first fiber collimator 6 is connected to the input of a first lens 7. The output of the first lens 7 illuminates a reference mirror 8, which is used to treat the entire reference arm 35 as a standard interference light source. During system operation, the reference arm 35 reflects a standard interference beam back to the 2×2 fiber coupler 3, and the interference of the light is used to reflect the sample information.

[0020] The output terminal (c) of the 2×2 fiber coupler 3 is connected to the input terminal of the second polarization controller 9; the output terminal of the second polarization controller 9 is connected to the input terminal of the 1×3 fiber beam splitter 10; the output terminal (a) of the 1×3 fiber beam splitter 10 is connected to the input terminal of the first timer 11; the output terminal of the first timer 11 is connected to the input terminal of the second fiber attenuator 14 to specify the path time for the optical path at the output terminal (a) of the 1×3 fiber beam splitter 10, preventing aliasing of optical signals from different optical paths; the output terminal of the second fiber attenuator 14 is connected to the first MEMS scanning mirror 17; the first MEMS scanning mirror... 17 is used to control the reflection angle of the laser, initially used to collect object information at different positions; the first MEMS scanning galvanometer 17 is connected to the first probe 20, and the first moving servo motor 23 is connected to the first probe 20. Both are installed on the movable track 26 to scan the object depth information along the entire X-axis; the b-output of the 1×3 fiber beam splitter 10 is connected to the input of the second timer 12; the output of the second timer 12 is connected to the input of the third fiber attenuator 15 to specify the path time for the optical path of the b-output of the 1×3 fiber beam splitter 10 and prevent different optical paths from interfering with each other. Optical signal aliasing occurs; the output of the third fiber optic attenuator 15 is connected to the second MEMS scanning mirror 18; the second MEMS scanning mirror 18 is used to control the laser reflection angle, initially used to collect object information at different positions; the second MEMS scanning mirror 18 is connected to the second probe 21, and the second motion servo motor 24 is interconnected with the second probe 21, both being mounted on the movable track 26 for scanning the object depth information along the entire Y-axis; the c output of the 1×3 fiber optic beam splitter 10 is connected to the input of the third timer 13; the output of the third timer 13 is connected to... The input end of the fourth fiber optic attenuator 16 specifies the path time for the output end of the 1×3 fiber optic beam splitter 10 to prevent aliasing of optical signals from different optical paths. The output end of the fourth fiber optic attenuator 16 is connected to the third MEMS scanning mirror 19. The third MEMS scanning mirror 19 is used to control the reflection angle of the laser and is initially used to collect object information at different positions. The third MEMS scanning mirror 19 is connected to the third probe 22. The third moving servo motor 25 is connected to the third probe 22. Both are installed on the movable track 26 to scan the object depth information along the entire Z-axis.

[0021] The output end b of the 2×2 fiber coupler 3 is connected to the input end of the second fiber collimator 29 to ensure the parallelism of the laser; the output end of the second fiber collimator 29 is connected to the input end of the diffraction grating 30 to allow the wavelength to spread in space; the output end of the diffraction grating 30 is connected to the second lens 31; the second lens 31 is connected to the input end of the CCD camera 32; the output end of the CCD camera 32 is connected to the data acquisition and processing card 33 to first distinguish the wavelength and phase data of the acquired light along different optical paths of the X, Y, and Z axes, and then process the data from different paths collaboratively; the data acquisition and processing card 33 is connected to the PC 34, where the processed X, Y, and Z data are processed to generate a three-dimensional image.

[0022] The principle of this application is as follows: the 840nm continuous light emitted by the broadband low coherence light source 1 is split into two paths. One path of light is attenuated by an optical fiber to ensure that the intensity of the two paths is matched. After passing through the reference mirror 8, this beam of light provides a standard reference beam for the beam of the other sample arm 37, ensuring that the beam reflected by the sample arm 37 can have a stable optical path difference with the standard light, thereby forming stable interference. Another beam is split into three beams by a 1×3 fiber optic beam splitter. Each beam passes through a fiber optic attenuator to ensure intensity matching. To ensure that the three beams use the same interferometer and that the signals do not overlap, the on / off state of the beams is controlled by a timer. The time is divided into three parts and tagged. Tag 1 allows only the first beam to pass through, tag 2 allows only the second beam to pass through, and tag 3 allows only the third beam to pass through. This tagged each beam to distinguish different samples, enabling the simultaneous acquisition of sample information from three different beams within the same optical coherence tomography (OCT) structure. Each probe is also independently connected to a servo motor to control its movement on the movable track 26, allowing for the automatic acquisition of the three-dimensional internal information of the target object in a very short time. The three sample reflected beams are then reflected back to the 2×2 fiber coupler 3 and reference arm 35 for light interference. The interfered light contains both the distinguishing information of the three different sample beams and the depth information of the sample within the same sample, ensuring that different sample beams do not overlap while ensuring that no sample information is lost. The interfered light is then split by the diffraction grating 30 and enters the CCD camera 32 to collect wavelength and wavenumber information. When the information enters the data acquisition and processing card 33, each beam has already been tagged with time, thus automatically distinguishing the scanning information of the XYZ axes and quickly and completely acquiring a three-dimensional image of the object.

[0023] This application utilizes the output of a broadband low-coherence light source 1, which is then used to form a reference light and multiple sample lights via a 2×2 fiber coupler 3. Different fixed optical path compensation sections are set in each sample light path, so that the interference signals corresponding to different beams form non-overlapping depth windows in the frequency domain space, thereby completing the synchronous acquisition of multi-point information in the same spectral detection unit.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An adaptive multi-path cooperative scanning optical coherence tomography three-dimensional imaging device, characterized in that: The system includes a broadband low-coherence light source (1), an optical isolator (2), a 2×2 fiber coupler (3), a second polarization controller (9), a reference arm (35), a sample arm (37), and a detector arm (38). The continuous light emitted by the broadband low-coherence light source (1) is split into two paths by the 2×2 fiber coupler (3) after passing through the optical isolator (2). One path enters the reference arm (35), and the other path enters the sample arm (37) after passing through the second polarization controller (9). The reference arm (35) is used to provide a standard reference light for the beam of the sample arm (37). The sample arm (37) is equipped with three beams of light that use the same set of interference equipment and whose light signals do not overlap. The on and off of the three beams of light are controlled by their respective timers to obtain three beams of sample reflected light of the target scanned object. The three beams of sample reflected light will then be reflected back to the 2×2 fiber coupler (3) and interfere with the light of the reference arm (35). The interfered light enters the detector arm (38) for signal calculation to obtain a three-dimensional stereoscopic image of the target scanned object.

2. The adaptive multi-path cooperative scanning optical coherence tomography three-dimensional imaging device according to claim 1, characterized in that: The reference arm (35) includes a first fiber attenuator (4), a first polarization controller (5), a first fiber collimator (6), a first lens (7), and a reference mirror (8). The output end of the 2×2 fiber coupler (3) is connected to the input end of the first fiber attenuator (4); the output end of the first fiber attenuator (4) is connected to the input end of the first polarization controller (5); the output end of the first polarization controller (5) is connected to the input end of the first fiber collimator (6); the output end of the first fiber collimator (6) is connected to the input end of the first lens (7), and the output end of the first lens (7) illuminates the reference mirror (8).

3. The adaptive multi-path cooperative scanning optical coherence tomography three-dimensional imaging device according to claim 1 or 2, characterized in that: The sample arm (37) includes a 1×3 fiber optic beam splitter (10), a first timer (11), a second timer (12), a third timer (13), a second fiber optic attenuator (14), a third fiber optic attenuator (15), a fourth fiber optic attenuator (16), a first MEMS scanning mirror (17), a second MEMS scanning mirror (18), a third MEMS scanning mirror (19), a first probe (20), a second probe (21), a third probe (22), a first motion servo motor (23), a second motion servo motor (24), and a third motion servo motor (25); The output of the second polarization controller (9) is connected to the input of the 1×3 fiber beam splitter (10); the a output of the 1×3 fiber beam splitter (10) is connected to the input of the first timer (11); the output of the first timer (11) is connected to the input of the second fiber attenuator (14); the output of the second fiber attenuator (14) is connected to the first MEMS scanning mirror (17); the first MEMS scanning mirror (17) is connected to the first probe (20); and the first moving servo motor (23) is connected to the first probe (20). The b output of the 1×3 fiber beam splitter (10) is connected to the input of the second timer (12); the output of the second timer (12) is connected to the input of the third fiber attenuator (15); the output of the third fiber attenuator (15) is connected to the second MEMS scanning mirror (18); the second MEMS scanning mirror (18) is connected to the second probe (21); and the second motion servo motor (24) is connected to the second probe (21). The c output of the 1×3 fiber beam splitter (10) is connected to the input of the third timer (13); the output of the third timer (13) is connected to the input of the fourth fiber attenuator (16); the output of the fourth fiber attenuator (16) is connected to the third MEMS scanning mirror (19); the third MEMS scanning mirror (19) is connected to the third probe (22); and the third motion servo motor (25) is connected to the third probe (22).

4. The adaptive multi-path cooperative scanning optical coherence tomography three-dimensional imaging device according to claim 3, characterized in that: The sample arm (37) is equipped with a sample holder (36), which is composed of a movable track (26) and a square frame (27).

5. The adaptive multi-path cooperative scanning optical coherence tomography three-dimensional imaging device according to claim 4, characterized in that: The first moving servo motor (23) and the first probe (20) connected to each other are simultaneously mounted on the movable track (26) for scanning the object depth information along the entire X-axis; The second moving servo motor (24) and the second probe (21) connected to each other are simultaneously mounted on the movable track (26) for scanning the object depth information along the entire Y-axis; The third motion servo motor (25) and the third probe (22) are connected to each other and are simultaneously mounted on the movable track (26) to scan the object depth information of the entire Z axis.

6. The adaptive multi-path cooperative scanning optical coherence tomography three-dimensional imaging device according to claim 5, characterized in that: The probe arm (38) includes a second fiber collimator (29), a diffraction grating (30), a second lens (31), a CCD camera (32), a data acquisition and processing card (33), and a PC (34). The b output end of the 2×2 fiber coupler (3) is connected to the input end of the second fiber collimator (29); the output end of the second fiber collimator (29) is connected to the input end of the diffraction grating (30); the output end of the diffraction grating (30) is connected to the second lens (31); the second lens (31) is connected to the input end of the CCD camera (32); the output end of the CCD camera (32) is connected to the data acquisition and processing card (33), which is used to distinguish the wavelength and phase data of the acquired light along different optical paths of the X, Y, and Z axes, and then process the data of different paths in a coordinated manner; the data acquisition and processing card (33) is connected to the PC (34), and the processed X, Y, and Z data are processed on the PC (34) to generate a three-dimensional stereoscopic image of the target scanning object.

7. The adaptive multi-path cooperative scanning optical coherence tomography three-dimensional imaging device according to claim 1, characterized in that: The broadband low-coherence light source (1) outputs continuous light with a wavelength of 820~860nm.

8. The adaptive multi-path cooperative scanning optical coherence tomography three-dimensional imaging device according to claim 3, characterized in that: The on / off state of the three light paths is controlled by corresponding timers. Under a single time unit, the time is divided into three parts and labeled. The time of label 1 only allows the first light path to pass through, the time of label 2 only allows the second light path to pass through, and the time of label 3 only allows the third light path to pass through, thus labeling each light path to distinguish different samples.

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