High-integration spectrometer structure

Abstract

The utility model discloses a high-integration spectrometer structure. The high-integration spectrometer structure comprises a high-integration spectrometer seat, the incident end of the spectrograph seat is connected with the incident assembly, and the output end of the spectrograph seat is connected with the detector; the interior of the spectrograph base is of a cavity structure, and the optical lens is fixedly installed in the spectrograph base through an embedded connection structure. According to the high-integration spectrograph structure, the high-integration spectrograph base has the supporting function of a traditional spectrograph shell and also has the function of a mirror bracket. The spectrograph base is directly matched with the optical lens, mirror bracket parts are omitted, machining errors of the mirror bracket are reduced, assembly errors caused by the mirror bracket and the optical lens as well as the mirror bracket and the shell are reduced, and the overall precision is improved compared with that of a traditional spectrograph. Meanwhile, the material cost of the spectacle frame is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of spectrometers, in particular to a highly integrated spectrometer structure. Background Art

[0002] Optical coherence tomography (OCT) is a non-destructive, non-invasive, high-resolution three-dimensional imaging technology that has been widely used in workpiece flaw detection, melt pool monitoring, medicine and other fields, especially in the ophthalmology industry. Optical coherence tomography uses near-infrared lasers to detect samples and uses a spectrometer to analyze the interference spectrum of sample light and reference light to obtain sample information such as hole depth and cross-sectional images.

[0003] The OCT spectrometer used in an optical coherence tomography system has a huge impact on the quality of the collected images. The OCT spectrometer affects the imaging depth, resolution, image acquisition speed, and image contrast of the entire OCT system. Low "roll-off" (i.e., the signal sensitivity begins to decay with increasing depth) is a key performance parameter for any OCT spectrometer, and this parameter is directly determined by the spectrometer performance.

[0004] The spectrometer mainly uses the principles of light diffraction, dispersion or optical modulation to decompose light of different frequencies according to wavelength or other rules to form a spectrum, and cooperates with optics, precision machinery, electronics and software systems to achieve precise measurement of spectral intensity and frequency. The OCT spectrometer has the characteristics of non-contact and high sensitivity. The spectrometer structure mainly includes: light source, collimation system, reflector, grating, focusing mirror, detector, optical path adjustment fixture, etc.

[0005] Common spectrometers mainly adopt split mechanical structures, such as the spectrometer structure described in Chinese patent CN110411563A. The spectrometer first needs a strong supporting structure - shell, such as Figure 1 As shown in the figure, A is the housing, B is the detector, C is the lens, D is the grating, E is the MEMS reflector, F is the incident light grating, and G is the wedge. The lens, grating, MEMS reflector, etc. are fixed on the frame to form corresponding components, and each component is then locked with the housing by screws.

[0006] However, the split structure was found to have the following technical defects during production and use:

[0007] 1. Assembly is troublesome: Each optical lens and frame component needs to be assembled at least once; each component needs to be assembled again when combined with the shell.

[0008] 2. There are many mechanical parts, and the machining errors of mechanical parts and multiple assembly errors will accumulate, thereby reducing the overall accuracy of the spectrometer.

[0009] 3. The overall volume is relatively large, and the processing cost of the housing is relatively expensive. Summary of the Invention

[0010] In order to solve the above technical problems, the utility model provides a highly integrated spectrometer structure, which is convenient to assemble, has few parts and a small volume.

[0011] The solution of the utility model to the above technical problems is as follows:

[0012] A highly integrated spectrometer structure, including a highly integrated spectrometer base;

[0013] The incident end of the spectrometer base is connected to the incident component, and the output end of the spectrometer base is connected to the detector;

[0014] The inside of the spectrometer base is a cavity structure, and the optical lens is fixedly installed in the spectrometer base through an embedded connection structure.

[0015] A first stepped hole for placing the optical lens is provided in the internal cavity of the spectrometer base, and the optical lens is fixed in the first stepped hole of the spectrometer base through an external thread pressing ring.

[0016] A second stepped hole for placing the optical lens is provided on the outer surface of the spectrometer base, and the optical lens is fixed in the second stepped hole of the spectrometer base through a gland.

[0017] A grating assembly is fixedly installed in the internal cavity of the spectrometer base. The grating assembly includes a grating and a grating holder, and the grating holder is fixedly installed (such as pin positioning, screw locking) on the inner wall of the spectrometer base.

[0018] Considering the machining difficulty and machining cost, the spectrometer base includes a first main body and a second main body which are fixedly connected (such as pin positioning, screw locking) and communicated. The first main body is connected to the incident component, and the second main body is connected to the detector.

[0019] A support cylinder is built in the first main body, and the central axis of the support cylinder forms an angle of 1.8±0.05° with the incident optical axis of the detector. The support cylinder can ensure the distance between the incident component and the optical lens.

[0020] An L-shaped plate extends from the output end of the second main body. Two strip holes are provided in the L-shaped plate. Two adjusting screws respectively pass through the two strip holes and are screwed into the detector. The width of the strip holes is greater than the diameter of the adjusting screws. When the adjusting screws are loosened, the detector can move and adjust along the strip holes, and can also move and adjust slightly along the width of the strip holes to compensate for machining, assembly errors, etc.

[0021] The incident component is an optical fiber and an optical fiber flange, the optical lens is a focusing lens, a collimating lens and a reflecting mirror, and the detector is a CCD camera.

[0022] The utility model has the following advantages compared with the prior art:

[0023] 1. The high-integration spectrometer structure, with its highly integrated spectrometer base, not only has the support function of the traditional spectrometer housing but also has the function of a lens holder. The spectrometer base directly cooperates with the optical lens, eliminating the lens holder part, reducing the processing error of the lens holder, and reducing the assembly error caused by "the lens holder and the optical lens, the lens holder and the housing". The overall accuracy is improved compared with the traditional spectrometer. At the same time, the material cost of the lens holder is saved.

[0024] 2. The shape of the spectrometer base can be adapted to the optical path shape, and the structure of the spectrometer base can be designed according to the optical path. The overall volume is proportional to the optical path volume. Compared with the traditional spectrometer, the volume can be minimized.

[0025] 3. Due to appearance or sealing requirements, a large blank material is needed for processing the housing of the traditional spectrometer, resulting in material waste and high cost. While for this high-integration spectrometer structure, less blank material is needed, and the processing raw material cost is reduced. Description of the Drawings

[0026] Figure 1 is the split spectrometer structure of the prior art.

[0027] Figure 2 is the cross-sectional view of the high-integration spectrometer structure of the utility model.

[0028] Figure 3 is Figure 2 the three-dimensional view of

[0029] Figure 4 is Figure 2 the three-dimensional view from another angle of

[0030] Figure 5 is the partial enlarged view of the second focusing lens structure.

[0031] Figure 6 is the partial enlarged view of the reflecting mirror structure.

[0032] Figure 7 is the partial enlarged view of the grating assembly structure.

[0033] Figure 8 is the partial enlarged view of the CCD camera structure. Detailed Embodiments

[0034] The following further describes the utility model in conjunction with the drawings and embodiments.

[0035] As Figures 2 - 8 shown in the highly integrated spectrometer structure, which includes a highly integrated spectrometer base. Considering the processing difficulty and cost, the spectrometer base includes a first body 3 and a second body 1 that are positioned by pins, locked by screws, and connected. The incident end of the first body 3 is connected to an incident component, and the incident component is an optical fiber 11 and an optical fiber flange 9. The output end of the second body 1 is connected to a detector, and the detector is a CCD camera 10.

[0036] The inside of the spectrometer base is a cavity structure, and 4 optical lenses are fixedly installed in the spectrometer base through an embedded connection structure. The optical lenses include a first focusing lens 2, a second focusing lens 4, a collimating lens 7, and a mirror 6.

[0037] Three first stepped holes 12 for placing the first focusing lens 2, the second focusing lens 4, and the collimating lens 7 are provided in the internal cavity of the spectrometer base. The first focusing lens 2, the second focusing lens 4, and the collimating lens 7 are respectively fixed in the first stepped holes 12 of the spectrometer base through their respective external thread retaining rings 13.

[0038] A second stepped hole 14 for placing the mirror 6 is provided on the outer surface of the spectrometer base, and the mirror 6 is fixed in the second stepped hole 14 of the spectrometer base through a gland 15.

[0039] A grating assembly 5 is fixedly installed in the internal cavity of the spectrometer base. The grating assembly 5 includes a grating 15 and a grating holder 16, and the grating holder is positioned by pins and locked by screws on the inner wall of the spectrometer base.

[0040] A support cylinder 8 is built into the first body 3, and the central axis of the support cylinder 8 forms an angle of 1.8 ± 0.05° with the incident optical axis of the detector. The support cylinder 8 can ensure the distance between the incident component and the collimating lens 7.

[0041] An L-shaped plate 17 extends from the output end of the second body 1. Two strip holes 18 are provided in the L-shaped plate 17, and two adjusting screws 19 respectively pass through the two strip holes 18 and are screwed into the CCD camera 10. The width of the strip holes 18 is greater than the diameter of the adjusting screws 19. When the adjusting screws 19 are loosened, the CCD camera 10 can move and adjust along the strip holes 18, and can also move and adjust slightly along the width of the strip holes 18 to compensate for machining, assembly errors, etc.

[0042] The light coming out of the optical fiber 11 passes through the collimating lens 7 in sequence, is reflected by the mirror 6 and reaches the grating 15, is dispersed at the grating 15, and then enters the CCD camera 10 through the second focusing lens 4 and the first focusing lens 2.

[0043] The above is a preferred embodiment of the present utility model. However, the embodiments of the present utility model are not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present utility model shall be equivalent replacement methods and are all included in the protection scope of the present utility model.

Claims

1. Structure of a highly integrated spectrometer, characterized in that: It includes a highly integrated spectrometer base; The incident end of the spectrometer base is connected to an incident component, and the output end of the spectrometer base is connected to a detector; The interior of the spectrometer base is a cavity structure, and the optical lens is fixedly installed in the spectrometer base through an embedded connection structure.

2. The high-integration spectrometer structure according to claim 1, wherein: A first stepped hole for placing the optical lens is formed in the internal cavity of the spectrometer base, and the optical lens is fixed in the first stepped hole of the spectrometer base through an external thread compression ring.

3. The high-integration spectrometer structure according to claim 1, wherein: A second stepped hole for placing the optical lens is formed in the outer surface of the spectrometer base, and the optical lens is fixed in the second stepped hole of the spectrometer base through a gland.

4. The high-integration spectrometer structure according to claim 1, wherein: A grating assembly is fixedly installed in the internal cavity of the spectrometer base. The grating assembly includes a grating and a grating holder, and the grating holder is fixedly installed on the inner wall of the spectrometer base.

5. The high-integration spectrometer structure according to claim 1, wherein: The spectrometer base includes a first main body and a second main body that are fixedly connected and communicate with each other. The first main body is connected to the incident component, and the second main body is connected to the detector.

6. The high-integration spectrometer structure according to claim 5, wherein: A support cylinder is built in the first main body, and the central axis of the support cylinder forms an angle of 1.8±0.05° with the incident optical axis of the detector.

7. The high-integration spectrometer structure according to claim 5, characterized in that: An L-shaped plate extends from the output end of the second main body. Two strip holes are formed in the L-shaped plate, and two adjusting screws respectively pass through the two strip holes and are screwed into the detector. The width of the strip holes is greater than the diameter of the adjusting screws.

8. The high-integration spectrometer structure according to claim 1, wherein: The incident component is an optical fiber and an optical fiber flange, the optical lens is a focusing lens, a collimating lens and a reflector, and the detector is a CCD camera.

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