Spectrometer performance calibration device for frequency domain OCT systems

Abstract

The application discloses a kind of spectrometer performance calibration devices for frequency domain OCT system, include: two groups of calibration light path components, light source drive board and fiber coupler;Two groups of calibration light path components are connected to fiber coupler;Fiber coupler is connected to light source drive board;Calibration light path component includes: six-dimensional adjustment frame, installation lens barrel, corner cube, optical flat, two-dimensional adjustment frame, collimating lens and collimating adjustment frame;Corner cube is installed to installation lens barrel;Installation lens barrel is connected to six-dimensional adjustment frame;Optical flat is installed to two-dimensional adjustment frame;Collimating lens is installed to collimating adjustment frame;Collimating adjustment frame is equipped with fiber connection part;Two-dimensional adjustment frame is between installation lens barrel and collimating adjustment frame.This application's spectrometer performance calibration device for frequency domain OCT system, simple structure can obtain signal-to-noise ratio with depth variation curve and other performance indicators, judge spectrometer assembly and debugging result, improve instrument consistency.

Description

Technical Field

[0001] This invention relates to a spectrometer performance calibration device for a frequency domain OCT system. Background Technology

[0002] Currently, after the spectrometers used in frequency domain OCT systems are debugged, there is a lack of suitable testing fixtures, making it impossible to obtain performance indicators such as signal-to-noise ratio. Furthermore, there are significant differences between different spectrometers, resulting in poor consistency. The lack of spectrometer testing fixtures also makes it impossible to measure performance indicators such as the signal-to-noise ratio versus depth curve, and there is a lack of corresponding judgment standards. Summary of the Invention

[0003] This invention provides a spectrometer performance calibration device for a frequency domain OCT system to solve the aforementioned technical problems, specifically adopting the following technical solution:

[0004] A spectrometer performance calibration device for a frequency domain OCT system includes: two sets of calibration optical path components, a light source driver board, and an optical fiber coupler;

[0005] Both sets of calibration optical path components are connected to fiber optic couplers;

[0006] The fiber optic coupler is connected to the light source driver board;

[0007] The calibration optical path assembly includes: a six-dimensional adjustment frame, a mounting lens tube, a corner pyramid, an optical flat, a two-dimensional adjustment frame, a collimating lens, and a collimating adjustment frame;

[0008] The corner cone is installed inside the mounting tube;

[0009] Install the lens tube and connect it to the six-dimensional adjustment frame;

[0010] Optical flat crystal mounted to a two-dimensional adjustment frame;

[0011] The collimating lens is mounted on the collimating adjustment frame;

[0012] The collimation adjustment frame is equipped with an optical fiber connector;

[0013] The two-dimensional adjustment frame is located between the mounting lens tube and the collimation adjustment frame.

[0014] Furthermore, the calibration optical path assembly also includes a measurement bracket;

[0015] The two-dimensional adjustment frame and the collimation adjustment frame are mounted on the measuring support.

[0016] Furthermore, the spectrometer performance calibration device for the frequency domain OCT system also includes a mounting plate;

[0017] The calibration optical path components, light source driver board, and fiber optic coupler are all mounted on the mounting plate.

[0018] Furthermore, the mounting plate is rectangular;

[0019] Two sets of calibration optical path components are located at both ends of the mounting plate.

[0020] Furthermore, the light source driver board and fiber optic coupler are located between the two sets of calibration optical path components.

[0021] Furthermore, one end of the fiber optic coupler is provided with a first fiber and a second fiber.

[0022] The other end of the fiber optic coupler is equipped with a third fiber and a fourth fiber;

[0023] The first optical fiber is connected to the optical fiber interface of the light source driver board;

[0024] The second optical fiber is connected to the spectrometer;

[0025] The third and fourth optical fibers are respectively connected to the optical fiber connectors of the two collimation adjustment frames.

[0026] Furthermore, the collimation adjustment frame includes: an optical fiber connector, a lens holder, and an adjustment thread pair;

[0027] The optical fiber connector has a through hole, with one end of the through hole connected to the optical fiber and the other end open.

[0028] A sliding guide groove is formed on the side of the optical fiber connector;

[0029] The lens holder is located inside the through hole of the optical fiber connector and partially passes through the sliding guide groove and can slide along the sliding guide groove.

[0030] The portion of the lens holder located within the through hole has a first mounting hole, into which the collimating lens is mounted;

[0031] The portion of the lens holder that passes through the sliding guide groove has a first threaded hole;

[0032] A second threaded hole that mates with the first threaded hole is formed on the outer side of the optical fiber connector.

[0033] The adjusting threaded pair passes through the first threaded hole and the second threaded hole.

[0034] Furthermore, the two-dimensional adjustment frame includes: a first mounting frame, a second mounting frame, and two adjustment components;

[0035] The first mounting bracket is connected to the measuring bracket;

[0036] The two adjusting components pass through the first mounting bracket and the second mounting bracket, respectively.

[0037] The second mounting bracket has a second mounting hole, into which the optical flat is mounted.

[0038] Furthermore, both the first and second mounting brackets are L-shaped;

[0039] Two adjustment components are located at both ends of the first mounting bracket.

[0040] The advantage of this invention is that the spectrometer performance calibration device provided for frequency domain OCT systems has a simple structure, can obtain performance indicators such as the signal-to-noise ratio as a function of depth, judge the spectrometer assembly and debugging results, and improve instrument consistency.

[0041] The advantage of this invention also lies in the spectrometer performance calibration device provided for frequency domain OCT systems. By using the calibration device, two optical path interference methods can be selected simultaneously, namely, split-path interference or common-path interference. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of a spectrometer performance calibration device for a frequency domain OCT system according to the present invention;

[0044] Figure 2 This is a cross-sectional view of a spectrometer performance calibration device for a frequency domain OCT system according to the present invention;

[0045] Figure 3 This is a schematic diagram of a collimation adjustment frame for a spectrometer performance calibration device for a frequency domain OCT system according to the present invention;

[0046] Figure 4 This is a schematic diagram of a spectrometer performance calibration device for a frequency domain OCT system according to the present invention;

[0047] The optical path assembly includes: 10, six-dimensional adjustment bracket 11, mounting lens tube 12, corner pyramid 13, optical flat 14, two-dimensional adjustment bracket 15, first mounting bracket 151, second mounting bracket 152, adjustment component 153, second mounting hole 154, collimating lens 16, collimating adjustment bracket 17, fiber optic connector 171, lens holder 172, adjusting threaded pair 173, through hole 174, sliding guide groove 175, first threaded hole 176, second threaded hole 177, first mounting hole 178, measuring bracket 18, light source drive board 20, fiber optic coupler 30, and mounting plate 40. Detailed Implementation

[0048] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0049] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] like Figure 1-3 The image shows a spectrometer performance calibration device for a frequency-domain OCT system according to this application, comprising: two sets of calibration optical path components 10, a light source driver board 20, and an optical fiber coupler 30. The two sets of calibration optical path components 10 have identical structures and each forms an optical path. Both sets of calibration optical path components 10 are connected to the optical fiber coupler 30. The optical fiber coupler 30 is connected to the light source driver board 20.

[0052] In this application, the calibration optical path assembly 10 includes: a six-dimensional adjustment frame 11, a mounting lens tube 12, a corner pyramid 13, an optical flat 14, a two-dimensional adjustment frame 15, a collimating lens 16, and a collimating adjustment frame 17.

[0053] Specifically, the corner bevel 13 is installed inside the mounting lens tube 12. The mounting lens tube 12 is connected to the six-dimensional adjustment frame 11. The optical flat 14 is installed to the two-dimensional adjustment frame 15. The collimating lens 16 is installed to the collimation adjustment frame 17. The collimation adjustment frame 17 is provided with an optical fiber connector 171. The two-dimensional adjustment frame 15 is located between the mounting lens tube 12 and the collimation adjustment frame 17. As a preferred embodiment, the calibration optical path assembly 10 also includes a measuring bracket 18. The two-dimensional adjustment frame 15 and the collimation adjustment frame 17 are disposed on the measuring bracket 18.

[0054] In a preferred embodiment, the spectrometer performance calibration device for a frequency-domain OCT system further includes a mounting plate 40. The calibration optical path assembly 10, the light source driver board 20, and the fiber optic coupler 30 are all mounted on the mounting plate 40. Specifically, the mounting plate 40 is rectangular, with the two sets of calibration optical path assemblies 10 located at opposite ends. The light source driver board 20 and the fiber optic coupler 30 are located between the two sets of calibration optical path assemblies 10.

[0055] In this application, one end of the fiber optic coupler 30 is provided with a first fiber and a second fiber. The other end of the fiber optic coupler 30 is provided with a third fiber and a fourth fiber. The first fiber is connected to the fiber optic interface of the light source driver board 20. The second fiber is connected to the spectrometer (not shown). The third fiber and the fourth fiber are respectively connected to the fiber optic connection parts 171 of the two collimation adjustment frames 17.

[0056] In a preferred embodiment, the collimation adjustment frame 17 includes: an optical fiber connector 171, a lens holder 172, and an adjustment thread pair 173.

[0057] The fiber optic connector 171 has a through hole 174, with one end connected to the fiber and the other end open. A sliding guide groove 175 is formed on the side of the fiber optic connector 171. A lens holder 172 is disposed within the through hole 174 of the fiber optic connector 171 and partially passes through the sliding guide groove 175, and can slide along the sliding guide groove 175. A first mounting hole 178 is formed in the portion of the lens holder 172 located within the through hole 174, and the collimating lens 16 is mounted into the first mounting hole 178. A first threaded hole 176 is formed in the portion of the lens holder 172 passing through the sliding guide groove 175. A second threaded hole 177 is formed on the outer side of the fiber optic connector 171, which mates with the first threaded hole 176. An adjusting threaded pair 173 passes through the first threaded hole 176 and the second threaded hole 177. The distance between the collimating lens 16 and the cone 13 can be adjusted by rotating the adjusting threaded pair 173.

[0058] In a preferred embodiment, the two-dimensional adjustment frame 15 includes: a first mounting frame 151, a second mounting frame 152, and two adjustment members 153.

[0059] The first mounting bracket 151 is connected to the measuring bracket 18. Two adjusting members 153 pass through the first mounting bracket 151 and the second mounting bracket 152 respectively. The second mounting bracket 152 is formed with a second mounting hole 154, into which the optical flat 14 is mounted.

[0060] In this application, both the first mounting bracket 151 and the second mounting bracket 152 are L-shaped. Two adjusting members 153 are disposed at both ends of the first mounting bracket 151.

[0061] like Figure 4 The diagram shows the schematic of the spectrometer performance calibration device of this application. Light emitted from the OCT light source is split into two paths after entering the fiber optic coupler through an optical fiber. These two paths pass through a collimating lens, an optical flat, and a corner pyramid, respectively, before being reflected back to the fiber optic coupler. A certain proportion of the reflected light enters the spectrometer module, where the computer controls the acquisition of spectral signals and processes them using algorithms to obtain structural information in the depth direction.

[0062] The entire system is a Michelson interferometer system. Two free light paths (i.e., the light path from the collimating lens to the corner pyramid and back to the collimating lens) serve as the reference arm and sample arm of the interferometer, respectively. This system allows for both split-path interferometry using the reference and sample arms, and also enables common-path interferometry by incorporating optical flats into either the reference or sample arm. Compared to split-path interferometry, common-path interferometry eliminates dispersion between the two arms, allowing for more accurate relative calibration and measurement.

[0063] Specifically, the optical path adjustment of the spectrometer performance calibration device for frequency domain OCT systems in this application includes two adjustment modes: split-path interference and common-path interference.

[0064] The common-path interference implementation method needs to satisfy the following two points:

[0065] 1. Add a two-dimensional adjustment frame 15 and an optical flat 14 to any optical path. The direction of the reflected light from the optical flat 14 can be adjusted by the two-dimensional adjustment frame 15, so that the reflected light from the optical flat 14 can be coupled into the optical fiber.

[0066] 2. The distance between the optical flat 14 and the surface of the pyramid 13 is required to be less than the range of the OCT system, while the thickness of the optical flat 14 exceeds the range of the OCT system. This ensures that only the flat surface close to the pyramid 13 can have optical interference with the surface of the pyramid 13.

[0067] Provided that requirements 1 and 2 are met simultaneously, common-path interference can be achieved using optical flat 14.

[0068] Specifically, during the split-path adjustment, two optical paths are used simultaneously, eliminating the need for the optical flat 14. The requirement is that the corner bevel 13 and the collimating lens 16 are coaxial. This is achieved by adjusting the six-dimensional adjustment frame 11 to ensure coaxiality between the corner bevel 13 and the collimating lens 16. The relative distance between the collimating lens 16 and the corner bevel 13 is then adjusted by adjusting the collimation adjustment frame 17. After both optical paths are debugged, spectral signals are acquired via computer. Following a series of data processing steps, OCT depth direction information is obtained, along with performance indicators such as the signal-to-noise ratio versus depth curve, to calibrate and confirm the spectrometer.

[0069] During common-path adjustment, an optical flat 14 needs to be installed in one optical path, while the other optical path does not require connection. The requirement is that the corner bevel 13, optical flat 14, and collimating lens 16 are coaxial. This is achieved by adjusting the six-dimensional adjustment frame 11 and the two-dimensional adjustment frame 15 to ensure coaxiality of the corner bevel 13, optical flat 14, and collimating lens 16. Adjusting the two-dimensional adjustment frame 15 ensures that the reflected light from the optical flat 14 is coupled into the optical fiber. The spacing between the optical flat 14 and the corner bevel 13 must be ensured to be within the range of the OCT system. The relative distance between the collimating lens 16 and the corner bevel 13 is adjusted. After optical path debugging, spectral signals are acquired by computer, and after a series of data processing steps, OCT depth direction information is obtained, along with performance indicators such as the signal-to-noise ratio versus depth curve, to calibrate and confirm the spectrometer.

[0070] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A spectrometer performance calibration device for a frequency domain OCT system, characterized in that, Includes: two sets of calibration optical path components, a light source driver board, and fiber optic couplers; Both sets of calibration optical path components are connected to the fiber coupler; The fiber optic coupler is connected to the light source driver board; The calibration optical path assembly includes: a six-dimensional adjustment frame, a mounting lens tube, a corner pyramid, an optical flat, a two-dimensional adjustment frame, a collimating lens, and a collimating adjustment frame; The corner cone is installed inside the mounting lens tube; The mounting lens tube is connected to the six-dimensional adjustment frame; The optical flat is mounted to the two-dimensional adjustment frame; The collimating lens is mounted to the collimating adjustment frame; The collimation adjustment frame is equipped with an optical fiber connection part; The two-dimensional adjustment frame is located between the mounting lens tube and the collimation adjustment frame; Optical path adjustment includes two adjustment modes: split-path interference and common-path interference; The collimation adjustment frame includes: the optical fiber connector, the lens frame, and the adjustment thread pair; The optical fiber connector has a through hole, with one end of the through hole connected to the optical fiber and the other end open. A sliding guide groove is formed on the side of the optical fiber connector; The lens holder is disposed in the through hole of the optical fiber connector and partially passes through the sliding guide groove and can slide along the sliding guide groove; The portion of the lens holder located within the through hole has a first mounting hole, and the collimating lens is mounted into the first mounting hole; The portion of the lens holder that passes through the sliding guide groove has a first threaded hole; The outer side of the optical fiber connector has a second threaded hole that mates with the first threaded hole. The adjusting threaded pair passes through the first threaded hole and the second threaded hole; The calibration optical path assembly also includes a measurement bracket; The two-dimensional adjustment frame and the collimation adjustment frame are mounted on the measuring bracket; The two-dimensional adjustment frame includes: a first mounting frame, a second mounting frame, and two adjustment components; The first mounting bracket is connected to the measuring bracket; The two adjusting members pass through the first mounting bracket and the second mounting bracket, respectively; The second mounting bracket has a second mounting hole, and the optical flat is mounted into the second mounting hole.

2. The spectrometer performance calibration device for a frequency domain OCT system according to claim 1, characterized in that, The spectrometer performance calibration device for the frequency domain OCT system also includes a mounting plate; The calibration optical path assembly, the light source driver board, and the fiber optic coupler are all mounted on the mounting plate.

3. The spectrometer performance calibration device for a frequency domain OCT system according to claim 2, characterized in that, The mounting plate is rectangular; The two sets of calibration optical path components are located at both ends of the mounting plate.

4. The spectrometer performance calibration device for a frequency domain OCT system according to claim 3, characterized in that, The light source driver board and the fiber optic coupler are located between the two sets of calibration optical path components.

5. The spectrometer performance calibration device for a frequency domain OCT system according to claim 1, characterized in that, The fiber optic coupler is provided with a first fiber and a second fiber at one end. The other end of the fiber optic coupler is provided with a third fiber and a fourth fiber; The first optical fiber is connected to the optical fiber interface of the light source driver board; The second optical fiber is connected to the spectrometer; The third optical fiber and the fourth optical fiber are respectively connected to the optical fiber connection parts of the two collimation adjustment frames.

6. The spectrometer performance calibration device for a frequency domain OCT system according to claim 1, characterized in that, Both the first mounting bracket and the second mounting bracket are L-shaped; The two adjustment members are located at both ends of the first mounting bracket.

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