OCT (optical coherence tomography) measuring system based on reference arm light splitting

Abstract

The invention relates to the technical field of measuring systems, in particular to an OCT (optical coherence tomography) measuring system based on reference arm light splitting, which comprises a light source, an optical fiber coupler, a reference arm switching device, a plurality of reference arms, a scanning detection mechanism, a detector and a spectrograph, light emitted by the light source passes through the optical fiber coupler, one path of light passes through the scanning part and is distributed to different depths such as the surface layer and the bottom of a to-be-detected object through the scanning detection mechanism, and the light returns to the optical fiber coupler along the original path after being reflected; the other path of light enters different reference arms through a reference arm switching device, the light of the reference arms enters an optical fiber coupler after being reflected, and the two paths of light enter a spectrograph after being interfered in the optical fiber coupler and are received by a detector; the multiple reference arms interfere with different depth reflected light information through the reference arm switching device; the measurement system is provided with an advanced signal processing host and an imaging system, can output images of the surface and the interested position of the object to be measured in real time, and improves the efficiency and accuracy of data processing.

Description

Technical Field

[0001] The present invention relates to the technical field of measurement systems, and in particular, to an OCT measurement system based on reference arm beam splitting. Background Art

[0002] Optical Coherence Tomography (OCT) technology is a high-resolution, non-invasive imaging technology that can be used to observe internal information of an object, and thus plays an important role in multiple fields. Spectral domain OCT (SD-OCT) with a wide spectrum has characteristics such as fast imaging speed, high resolution, high sensitivity, convenient data acquisition and analysis. In addition, it can form a three-dimensional image after integrating and reconstructing lateral scans at different positions. Therefore, the application scope of SD-OCT is becoming wider and wider.

[0003] However, for SD-OCT, improving the imaging range is usually restricted by the design of the spectrometer. How to improve the imaging range is a significant challenge for SD-OCT. Traditional OCT measurement systems are often limited in imaging depth and it is difficult to obtain deep internal structure information of the object to be measured. The invention proposes a method based on reference arm beam splitting to achieve time-sharing scanning of different depths of the object to be measured, for improving the detection depth of SD-OCT. The core technical method is to alternately realize different reference arm optical paths through an optical switching method. The specific switching method can be to select the optical path by means of scanning, and preferably, an optical switch can also be used to switch the optical path. The latter has a simple optical path structure and can realize the selection of two or more reference arm optical paths. Without additional processing of the optical path at the sample arm end, after the reference arm optical path is switched, OCT can scan the object images at different depths, so that tomograms at different depths can be realized, such as tomograms of the surface and bottom layer of the object to be measured, thereby realizing measurement at different detection depths.

[0004] Therefore, in view of the problem that the above traditional measurement system is often limited in imaging depth and it is difficult to obtain deep internal structure information of the object to be measured, an OCT measurement system based on reference arm beam splitting can be designed. Summary of the Invention

[0005] In order to overcome the problem that the traditional measurement system is often limited in imaging depth and it is difficult to obtain deep internal structure information of the object to be measured.

[0006] The technical solution of the present invention is as follows: An OCT measurement system based on reference arm beam splitting includes a light source, an object to be measured, an optical fiber coupler, a reference arm switching device, multiple reference arms, a scanning and detection mechanism, a detector, and a spectrometer; The light emitted by the light source passes through the optical fiber coupler. One path passes through the scanning part and is split by the scanning and detection mechanism to different depths of the object to be measured, such as the surface layer and the bottom layer, and after reflection, returns to the optical fiber coupler along the original path; The other path of light enters different reference arms through the reference arm switching device, and the light of the reference arm is reflected and then enters the optical fiber coupler. The two paths of light interfere in the optical fiber coupler and then enter the spectrometer to be received by the detector; The multiple reference arms interfere with the reflected light information at different depths through the reference arm switching device respectively.

[0007] Preferably, through the method of reference arm beam splitting, time-division scanning of different depths of the object to be measured is realized, thereby improving the detection depth of SD-OCT, being able to obtain internal structure information at deeper levels. Adopting the frequency-domain OCT technology with a wide spectrum, it has the characteristics of fast imaging speed, high resolution, and high sensitivity, and can clearly observe the fine structure of the object to be measured. This measurement system is equipped with an advanced signal processing host and imaging system, which can output the images of the surface of the object to be measured and the positions of interest in real time, improving the efficiency and accuracy of data processing.

[0008] Preferably, a signal processing host is electrically connected to the outside of the detector, and the signal processing host outputs the images of the surface of the object to be measured and the positions of interest in real time.

[0009] Preferably, the reference arm switching device includes an optical switch that switches alternately to realize the optical path lengths of different reference arms. A polarization adjuster is electrically connected to the outside of the optical switch. By switching the light of the optical switch alternately, the optical path lengths of different reference arms are realized. The optical path structure is simple and can realize the selection of the optical path lengths of two or more reference arms.

[0010] Preferably, the multiple reference arms include a reference arm one collimating mirror group, a reference arm one reflecting mirror group, a reference arm two collimating mirror group, and a reference arm two reflecting mirror group; The light is divided into two groups by the optical switch. One group passes through the reference arm one collimating mirror group and enters the reference arm one reflecting mirror group; The other group passes through the reference arm two collimating mirror group and enters the reference arm two reflecting mirror group. The reference arm reflects the light beam and returns to the optical fiber coupler along the original optical path. By driving the movement of the reflecting mirror in the reference arm with a motor, the optical path length of the light entering the reference arm can be changed, achieving the same effect as reference arm beam splitting, but unable to achieve the purpose of fast switching.

[0011] Preferably, the scanning detection mechanism includes an imaging scanning mirror group, a scanning galvanometer, a beam splitter, an imaging camera, a target beam splitter, and a target. A beam of light passes through the imaging scanning mirror group, the scanning galvanometer, the beam splitter, and the target beam splitter and then enters the object to be measured for collecting data of the object to be measured. After being reflected by the object to be measured, it returns to the fiber coupler along the original optical path, and the reference arm optical path is selected by switching the optical path in a scanning manner, using a scanning galvanometer or MEMS or DMD or LCOS.

[0012] Preferably, an imaging camera for collecting the surface image of the object to be measured is installed outside the beam splitter, and the scanning galvanometer and the multi-reference arm achieve time-sharing scanning of different depth information through high and low level matching.

[0013] Preferably, a target is provided outside the target beam splitter, and the target optical path is used for imaging on the surface of the object to be measured to determine the scanning center position during the test.

[0014] Preferably, the imaging camera is used to observe the surface information of the object to be measured, can be used to guide the OCT detection position and select the region of interest for key scanning at the same time.

[0015] Preferably, the three-dimensional image of the object to be measured can be output through the probe scanning of the imaging camera and the cooperation of the multi-reference arm.

[0016] The beneficial effects of the present invention: The method of splitting light in the reference arm realizes time-sharing scanning of different depths of the object to be measured, thereby improving the detection depth of SD-OCT, being able to obtain deeper internal structure information. Using the wide-spectrum frequency-domain OCT technology, it has the characteristics of fast imaging speed, high resolution, and high sensitivity, and can clearly observe the fine structure of the object to be measured. Compared with the traditional OCT measurement system, which is often limited in imaging depth and difficult to obtain the deep internal structure information of the object to be measured, this measurement system is equipped with an advanced signal processing host and imaging system, can real-time output the surface image of the object to be measured and the image of the position of interest, and improves the efficiency and accuracy of data processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shows a schematic structural diagram of the OCT measurement system based on reference arm beam splitting of the present invention;

[0018] Figure 2 Shows a schematic optical path diagram of reference arm beam splitting based on an optical switch in the OCT measurement system based on reference arm beam splitting of the present invention;

[0019] Figure 3 Shows a schematic optical path diagram of the reference arm based on scanning beam splitting in the OCT measurement system based on reference arm beam splitting of the present invention;

[0020] Figure 4Shown is the control algorithm diagram of Embodiment 2 in the OCT measurement system based on reference arm beam splitting of the present invention;

[0021] Figure 5 Shown is the control algorithm diagram of Embodiment 3 in the OCT measurement system based on reference arm beam splitting of the present invention.

[0022] Explanation of reference numerals: 1, light source; 2, fiber optic coupler; 3, reference arm switching device; 4, multi-reference arm; 7, detector; 8, spectrometer; 9, object to be measured; 301, optical switch; 302, polarization adjuster; 401, reference arm one collimating mirror group; 402, reference arm one mirror group; 403, reference arm two collimating mirror group; 404, reference arm two mirror group; 601, imaging scanning mirror group; 603, scanning galvanometer; 6051, beam splitting lens; 6052, imaging camera; 6061, target beam splitter; 6062, target. Detailed implementation manners

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Please refer to Figures 1 - 3, the present invention provides an embodiment: an OCT measurement system based on reference arm beam splitting, comprising a light source 1, a to-be-measured object 9, an optical fiber coupler 2, a reference arm switching device 3, multiple reference arms 4, a scanning and detection mechanism, a detector 7, and a spectrometer 8; the light emitted by the light source 1 passes through the optical fiber coupler 2, one path passes through the scanning part and is split by the scanning and detection mechanism to different depths of the to-be-measured object 9, such as the surface layer and the bottom, and after reflection, returns to the optical fiber coupler 2 along the original path; the other path of light enters different reference arms through the reference arm switching device 3, and the light of the reference arm is reflected and then enters the optical fiber coupler 2. The two paths of light interfere in the optical fiber coupler 2 and then enter the spectrometer 8 to be received by the detector 7; the multiple reference arms 4 interfere with the reflected light information of different depths through the reference arm switching device 3 respectively. By the method of reference arm beam splitting, time-division scanning of different depths of the to-be-measured object 9 is realized, thereby improving the detection depth of SD-OCT and enabling the acquisition of deeper internal structure information. Using the broadband frequency-domain OCT technology, it has the characteristics of fast imaging speed, high resolution, and high sensitivity, and can clearly observe the fine structure of the to-be-measured object 9. This measurement system is equipped with an advanced signal processing host and an imaging system, which can output the images of the surface and the interested positions of the to-be-measured object 9 in real time, improving the efficiency and accuracy of data processing. The outside of the detector 7 is electrically connected to a signal processing host, and the signal processing host outputs the images of the surface and the interested positions of the to-be-measured object 9 in real time. The reference arm switching device 3 includes an optical switch 301 that switches alternately to realize the optical path lengths of different reference arms. The outside of the optical switch 301 is electrically connected to a polarization adjuster 302. By the optical switching method of the optical switch 301, the optical path lengths of different reference arms are alternately realized. The optical path structure is simple and the selection of the optical path lengths of two or more reference arms can be realized. The multiple reference arms 4 include a reference arm one collimating lens group 401, a reference arm one reflecting mirror group 402, a reference arm two collimating lens group 403, and a reference arm two reflecting mirror group 404; the light is divided into two groups by the optical switch 301, one group passes through the reference arm one collimating lens group 401 and enters the reference arm one reflecting mirror group 402; the other group passes through the reference arm two collimating lens group 403 and enters the reference arm two reflecting mirror group 404. The reference arm reflects the light beam and returns to the optical fiber coupler 2 along the original optical path. By driving the movement of the reflecting mirror in the reference arm by a motor, the optical path length entering the reference arm can be changed, achieving the same effect as reference arm beam splitting, but unable to achieve the purpose of fast switching. The scanning and detection mechanism includes an imaging scanning lens group 601, a scanning galvanometer 603, a beam splitting lens 6051, an imaging camera 6052, a target beam splitter 6061, and a target 6062;A beam of light passes through the imaging scanning lens group 601, the scanning galvanometer 603, the beam splitting lens 6051, and the target beam splitter 6061 and then enters the object to be measured 9 for collecting data of the object to be measured 9. After being reflected by the object to be measured 9, it returns to the fiber coupler 2 along the original optical path. The optical path of the reference arm is selected by switching the optical path in a scanning manner, using the scanning galvanometer 603 or MEMS or DMD or LCOS. An imaging camera 6052 for collecting the surface image of the object to be measured 9 is installed outside the beam splitting lens 6051. The scanning galvanometer 603 and the multi-reference arm 4 achieve time-sharing scanning of different depth information through high and low level matching. A target 6062 is provided outside the target beam splitter 6061. The optical path of the target 6062 is used for imaging on the surface of the object to be measured 9 to determine the scanning center position during the test. The imaging camera 6052 is used to observe the surface information of the object to be measured 9, which can be used to guide the OCT detection position and simultaneously select the region of interest for key scanning. Through the probe scanning of the imaging camera 6052 and the cooperation of the multi-reference arm 4, a three-dimensional image of the object to be measured 9 can be output.

[0025] Figure 3 In the figure, reference numeral 9 is a lens, reference numeral 10 is a beam splitting element, reference numeral 11 is a mirror 1, and reference numeral 12 is a mirror 2.

[0026] Embodiment 1

[0027] Please refer to Figures 1 - 3, the present invention provides an embodiment: a biometer based on reference arm splitting, including a light source 1, an object to be measured 9, an optical fiber coupler 2, a reference arm switching device 3, multiple reference arms 4, a scanning and detection mechanism, a detector 7, and a spectrometer 8; the light emitted by the light source 1 passes through the optical fiber coupler 2. One path passes through the eye scanning part, passes through the scanning and detection mechanism to the eye surface and the fundus retina, and after reflection, returns to the optical fiber coupler 2 along the original path; the other path of light enters different reference arms through the reference arm switching device 3 and the multiple reference arms 4. The light of the reference arm is reflected and then enters the optical fiber coupler 2. The two paths of light interfere in the optical fiber coupler 2 and then enter the spectrometer 8 to be received by the detector 7; the multiple reference arms 4 interfere with the reflected light information of the anterior segment and the posterior segment of the eye respectively through the reference arm switching device 3. The optical fiber coupler 2 can divide the light emitted by the light source 1 into two paths. One path enters the eye for scanning, and the other path enters the reference arm for optical path matching. The reference arm switching device 3 can quickly switch different reference arm optical paths to achieve time-sharing scanning of the anterior segment and the posterior segment of the eye. The scanning and detection mechanism is used to perform two-dimensional scanning of the eye. Combining the design of the multiple reference arms 4, a three-dimensional image of the posterior segment retina can be output, providing more comprehensive diagnostic information for doctors. The outside of the detector 7 is electrically connected to a signal processing host that can calculate the axial length of the eye. The signal processing host outputs the images of the anterior segment and the posterior segment of the eye in real time. The reference arm switching device 3 includes an optical switch 301 that switches alternately to achieve different reference arm optical paths. The outside of the optical switch 301 is electrically connected to a polarization regulator 302. The optical path structure is simple and can achieve the selection of two or more reference arm optical paths. The multiple reference arms 4 include a reference arm one collimating lens group 401, a reference arm one reflecting mirror group 402, a reference arm two collimating lens group 403, and a reference arm two reflecting mirror group 404; the light is divided into two groups by the optical switch 301. One group passes through the reference arm one collimating lens group 401 and enters the reference arm one reflecting mirror group 402; the other group passes through the reference arm two collimating lens group 403 and enters the reference arm two reflecting mirror group 404. The reference arm reflects the light beam and returns to the optical fiber coupler 2 along the original path. By driving the movement of the reflecting mirror in the reference arm with a motor, the optical path entering the reference arm can be changed to achieve the same effect as reference arm splitting, but the purpose of quick switching cannot be achieved. Through the cooperation of the multiple reference arms 4, a three-dimensional image of the posterior segment retina can be output. The scanning and detection mechanism includes an imaging scanning lens group 601, a scanning galvanometer 603, an eyepiece, a beam splitter 6051, an imaging camera 6052, a target beam splitter 6061, and a target 6062;A beam of light passes through an imaging scanning lens group 601, a scanning galvanometer 603, a beam splitter 6051, an eye chart beam splitter 6061 and an eyepiece and then enters the eyeball for collecting eyeball data. After being reflected by the anterior segment and posterior segment of the eye, it returns to the fiber optic coupler 2 along the original optical path. The optical path of the reference arm is selected by switching the optical path in a scanning manner. The scanning galvanometer 603 or MEMS or DMD or LCOS is adopted. An imaging camera 6052 for collecting the surface image of the eyeball is installed outside the beam splitter 6051. The scanning galvanometer 603 and the multi-reference arm 4 achieve time-sharing scanning of the anterior segment and posterior segment of the eye through high and low level matching. An eye chart 6062 is arranged outside the eye chart beam splitter 6061. The optical path of the eye chart 6062 is used to attract the eyeball to keep the eyeball stable during the test. A small video playback device is adopted to avoid the rotation of the eyeball as much as possible during the detection of the eye axis length of children. The scanning optical path drives the scanning galvanometer 603 to perform two-dimensional scanning on the retina of the posterior segment of the eye. The iris imaging optical path in the beam splitter 6051 can obtain the iris curvature of the eye through calculation for the imaging of the eye surface. Among them, the imaging scanning lens group 601 specifically adopts the anterior segment and posterior segment scanning lens group, the beam splitter 6051 specifically adopts the iris beam splitter, the imaging camera 6052 specifically adopts the iris camera, and the imaging beam splitter 6061 specifically adopts the eye chart beam splitter.;

[0028] Embodiment 2

[0029] Please refer to Figures 1 - 4 , the present invention provides an embodiment: an OCT measurement system based on an optical switch to realize the switching between line scans, an OCT imaging system for imaging the skin. The sample arm is responsible for scanning the skin. The reference arm includes an optical switch 301 with 1 to 2 or 1 to multiple switches, corresponding to different reference arm optical paths. Thus, by switching the optical switch 301, the imaging of different depths of the object scanned by the sample arm can be realized. For example, a two-switch optical switch 301 is adopted. When the optical path of the adjacent switched channels is close to the eye axis length, the images of the stratum corneum and the dermis of the skin can be observed in two consecutive images. The eye chart 6062 can also be used as a special light source to perform special light irradiation on the skin, and the imaging camera 6052 can perform special light detection on the skin irradiated by the special light.

[0030] The above-mentioned OCT imaging range is usually small, and its imaging range is usually smaller than the skin depth information required to be measured; in order to avoid artifacts during the switching of OCT, the optical path difference between the two reference arms preferably needs to be greater than the imaging range.

[0031] For the above-mentioned switching of the reference arm optical path, it is preferably possible to use an optical switch for switching. Most preferably, an optical switch 301 with an extremely short switching time is used, which can realize the switching between OCT scan lines.

[0032] Figure 4 It is the control algorithm diagram for Embodiment 2 Figure 4Reference numeral 1 is the galvanometer scanning voltage, which corresponds to the galvanometer angle and position; reference numeral 2 is the optical switch switching level, where 1 and 0 represent the on and off times of one of the paths, indicating that the optical switch switches during the galvanometer scanning.

[0033] Embodiment 3

[0034] Please refer to Figures 1 - 3 Figures 4 and 5. The present invention provides an embodiment: an OCT measurement system that realizes switching between frame scans based on an optical switch, an OCT system for industrial ranging. The sample arm is responsible for scanning the object to be measured 9. The reference arm includes an optical switch 301 that switches from one to two or from one to multiple paths, corresponding to different reference arm optical paths. Thus, by switching the optical switch 301, imaging of the object scanned by the sample arm at different depths can be achieved. For example, by using an optical switch 301 with two switches, according to the depth where the reflection information of the object surface is located, the distance of the reference arm is adjusted in real time, and at the same time, the distance of the reference arm is recorded in real time to expand the measurement range.

[0035] The above-mentioned OCT measurement range is about 4 - 8 mm, and its imaging range is usually smaller than the measurement length in the industrial scenario; in order to avoid artifacts during the switching of OCT, preferably, the optical path difference between the two reference arms needs to be greater than the imaging range.

[0036] The above-mentioned switching of the reference arm optical path is realized by switching after scanning the entire image under one optical path to perform scanning of the second image at another depth.

[0037] Figure 5 It is the control algorithm diagram for Embodiment 3. Figure 5 Reference numeral 1 is the galvanometer scanning voltage, which corresponds to the galvanometer angle and position; reference numeral 2 is the optical switch switching level, where 1 and 0 represent the on and off times of one of the paths, indicating that the optical switch switches after scanning one frame of the image by the galvanometer.

[0038] During use, the light source 1 emits broadband light, which serves as the illumination light source 1 of the system. The emitted light first passes through the fiber optic coupler 2 and is divided into two paths. One path passes through the scanning part, through the scanning detection mechanism to the object to be measured 9, and after reflection, returns along the original path to the fiber optic coupler 2. The other path of light passes through the reference arm switching device 3 and the multi-reference arm 4 to enter different reference arms. The light reflected by the reference arm enters the fiber optic coupler 2. The two paths of light interfere in the fiber optic coupler 2 and then enter the spectrometer 8 and are received by the detector 7;

[0039] Among them, the light in the measurement optical path passes through the imaging scanning mirror group 601, the scanning galvanometer 603, the beam splitting lens 6051, and the target beam splitting mirror 6061, and then irradiates the object to be measured 9. The light reflected by the object to be measured 9 returns along the original path, passes through these optical elements again, and finally returns to the fiber optic coupler 2. At the same time, the light in the reference optical path is reflected by the mirror group in one of the reference arms in the multi-reference arm 4 and also returns to the fiber optic coupler 2;

[0040] The two returned lights interfere in the fiber optic coupler 2 to form an interference signal, which is then sent to the spectrometer 8, received by the detector 7 and converted into an electrical signal. The electrical signal received by the detector 7 is sent to the signal processing host for processing. The processing host analyzes the interference signal using an algorithm, calculates the axial length of the eye, and outputs the image of the object to be measured 9 in real time;

[0041] To achieve time-division scanning of the object to be measured 9, the optical switch 301 in the reference arm switching device 3 quickly switches different reference arm optical paths. The polarization adjuster 302 is used to adjust the polarization state of the light to ensure the interference efficiency. By switching different reference arms, the reflected light information of the object to be measured 9 can be obtained respectively. The scanning galvanometer 603 is used to perform two-dimensional scanning on the object to be measured 9. Combining with the design of the multi-reference arm 4, three-dimensional imaging of the object to be measured 9 can be realized. This three-dimensional imaging provides more comprehensive diagnostic information for doctors. The imaging optical path in the beam splitter 6051 can image the surface of the object to be measured 9. The target 6062 outside the target beam splitter 6061 is used to indicate the center position of the object to be measured 9, so as to quickly find the center position of the OCT scanning optical path during the test process, which helps to reduce the measurement deviation caused by the movement of the object to be measured 9.

[0042] Through the above steps, by means of reference arm beam splitting, time-division scanning of different depths of the object to be measured is realized, thereby improving the detection depth of SD-OCT and enabling the acquisition of deeper internal structure information. Using the wide-spectrum frequency-domain OCT technology, it has the characteristics of fast imaging speed, high resolution, and high sensitivity, and can clearly observe the fine structure of the object to be measured. This measurement system is equipped with an advanced signal processing host and imaging system, which can output the images of the surface and the interested positions of the object to be measured in real time, improving the efficiency and accuracy of data processing, so as to solve the problem that the traditional measurement system is often limited in imaging depth and difficult to obtain the deep internal structure information of the object to be measured.

[0043] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the purpose of the present invention.

Claims

1. An OCT measurement system based on reference arm splitting includes a light source (1) and an object to be measured (9); it is characterized in that: It also includes an optical fiber coupler (2), a reference arm switching device (3), multiple reference arms (4), a scanning and detection mechanism, a detector (7), and a spectrometer (8); the light emitted by the light source (1) passes through the optical fiber coupler (2), and one path passes through the scanning part and is divided by the scanning and detection mechanism to different depths of the object to be measured (9) such as the surface layer and the bottom, and after reflection, it returns to the optical fiber coupler (2) along the original path; the other path of light enters different reference arms through the reference arm switching device (3), and the light of the reference arm enters the optical fiber coupler (2) after reflection, and the two paths of light interfere in the optical fiber coupler (2) and then enter the spectrometer (8) and are received by the detector (7); the multiple reference arms (4) interfere with the reflected light information of different depths through the reference arm switching device (3) respectively.

2. The OCT measurement system based on reference arm beam splitting according to claim 1, wherein: The detector (7) is electrically connected to a signal processing host on the outside, and the signal processing host outputs the images of the surface and the interested positions of the object to be measured (9) in real time.

3. The OCT measurement system based on reference arm beam splitting according to claim 1, characterized in that: The reference arm switching device (3) includes an optical switch (301) that switches alternately to realize the optical path of different reference arms, and the optical switch (301) is electrically connected to a polarization adjuster (302) on the outside.

4. The OCT measurement system based on reference arm beam splitting according to claim 3, characterized in that: The multiple reference arms (4) include a reference arm one collimating lens group (401), a reference arm one reflecting mirror group (402), a reference arm two collimating lens group (403), and a reference arm two reflecting mirror group (404); the light is divided into two groups by the optical switch (301), one group passes through the reference arm one collimating lens group (401) and enters the reference arm one reflecting mirror group (402); the other group passes through the reference arm two collimating lens group (403) and enters the reference arm two reflecting mirror group (404), and the reference arms reflect the light beam and return to the optical fiber coupler (2) along the original path.

5. The OCT measurement system based on reference arm beam splitting according to claim 1, characterized in that: The scanning and detection mechanism includes an imaging scanning lens group (601), a scanning galvanometer (603), a beam splitter (6051), an imaging camera (6052), a target beam splitter (6061), and a target (6062); one path of light passes through the imaging scanning lens group (601), the scanning galvanometer (603), the beam splitter (6051), and the target beam splitter (6061) and then enters the object to be measured (9) for collecting data of the object to be measured (9), and after being reflected by the object to be measured (9), it returns to the optical fiber coupler (2) along the original path.

6. The OCT measurement system based on reference arm beam splitting according to claim 5, wherein: An imaging camera (6052) for collecting the surface image of the object to be measured (9) is installed outside the beam splitter (6051), and the scanning galvanometer (603) and the multiple reference arms (4) perform time-division scanning of different depth information through high and low level matching.

7. The OCT measurement system based on reference arm beam splitting according to claim 5, wherein: A target (6062) is provided outside the target beam splitter (6061), and the optical path of the target (6062) is used to indicate the scanning position of the object to be measured (9) so as to quickly find the measurement position during the test process.

8. The OCT measurement system based on reference arm beam splitting according to claim 6, characterized in that: The imaging camera (6052) is used to observe the surface information of the object to be measured (9), and can be used to guide the OCT detection position and select the interested area for key scanning at the same time.

9. The OCT measurement system based on reference arm beam splitting according to claim 6, wherein: Through the probe scanning of the imaging camera (6052) and the cooperation of the multiple reference arms (4), the three-dimensional image of the object to be measured (9) can be output.

Images