Light intensity matching structure for double-light-path low-coherence interference measurement

Abstract

The utility model relates to the technical field of optical precision measurement structures, and particularly discloses a light intensity matching structure for double-light-path low-coherence interference measurement, which comprises a support assembly, a control assembly and a light path assembly, and is characterized in that the control assembly is rotatably connected to the support assembly; the supporting assembly comprises a first base, a second base and a second fixing block. The second fixing block is fixedly connected to the upper portion of the rear side of the second base. The control assembly comprises a rotating shaft and a first fixing block, the first fixing block is fixedly connected to the front end of the rotating shaft, and the rotating shaft is rotationally connected to the first base and the second base; the optical path assembly comprises an optical filter, an incident optical fiber and a collimating lens. According to the utility model, the incident light intensity of the reference arm can be changed to be matched with the light intensity of the measuring arm, a better signal contrast is obtained, and the measuring precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical precision measurement structures, and particularly relates to a light intensity matching structure for dual-path low-coherence interference measurement. Background Art

[0002] In the non-contact precision measurement method of the central thickness of a lens, the dual-path low-coherence interference measurement technology is often used. The dual-path low-coherence interference measurement technology is an optical measurement method based on the principle of dual-beam heterodyne interference. This technology uses a Twyman-Green interference system, and through the reference optical path and the measurement optical path, signal processing and detection are carried out on the two optical paths, so as to achieve high-precision measurement.

[0003] At present, the following areas for improvement still exist in the existing technology: The reference arm usually uses a plane mirror or a corner cube, and the measurement arm is a lens to be measured with a low reflectivity. When the return signals of the reference arm and the measurement arm are quite different, the interference signal is weak, and it is difficult to accurately extract data and calculate the central thickness of the lens. Summary of the Utility Model

[0004] To solve the above problems existing in the prior art, the utility model provides a light intensity matching structure for dual-path low-coherence interference measurement, which can change the incident light intensity of the reference arm to match the light intensity of the measurement arm, obtain a better signal contrast ratio, and improve the measurement accuracy.

[0005] The purpose of the utility model can be realized through the following technical solutions:

[0006] A light intensity matching structure for dual-path low-coherence interference measurement includes a support assembly, a control assembly, and an optical path assembly. The control assembly is rotatably connected to the support assembly;

[0007] The support assembly includes a first base, a second base, and a second fixing block. The second fixing block is fixedly connected to the upper part of the rear side of the second base;

[0008] The control assembly includes a rotating shaft and a first fixing block. The first fixing block is fixedly connected to the front end of the rotating shaft. The rotating shaft is rotatably connected to the first base and the second base;

[0009] The optical path assembly includes a filter, an incident optical fiber, and a collimating lens. The filter is fixedly connected to the rotating shaft in an inclined manner. The incident optical fiber is fixedly connected to the front end of the collimating lens. The collimating lens is fixedly connected to the second fixing block.

[0010] Preferably, the filter is an optical flat glass with a transmittance plated along the circumferential direction.

[0011] Preferably, the first base is arranged in an inverted T shape.

[0012] Preferably, a through hole is formed at the upper end of the vertical T-shaped section of the first base, and the rotating shaft passes through the through hole of the first base.

[0013] Preferably, a semi-circular notch is formed on one side of the upper part of the second base.

[0014] Preferably, the semi-circular notch of the second base matches the rotating shaft.

[0015] Preferably, a through hole is formed in the middle of the upper part of the second base, and the collimating lens passes through the through hole of the second base.

[0016] Preferably, the first fixing block is in the shape of a bolt.

[0017] The beneficial effects of the present utility model are as follows:

[0018] (1) By providing the support assembly, the technical effect that can be achieved is to facilitate the positioning of the incident optical fiber and the collimating lens, facilitate the positioning of the control assembly and the filter, make the positions of the control assembly and the filter correspond to the positions of the incident optical fiber and the collimating lens, and facilitate the control of the light intensity.

[0019] (2) By providing the control assembly, the technical effect that can be achieved is to drive the filter to rotate through the rotating shaft, facilitating the control of the transmitted light intensity.

[0020] (3) By providing the optical path assembly, the technical effect that can be achieved is that the filter is fixedly connected to the rotating shaft in an inclined manner, avoiding the reflected light from re-entering the optical path and interfering with the interference signal. The filter is an optical flat glass with a transmittance of 0 to 1 plated along the circumferential direction, facilitating the control of the transmitted light intensity, realizing the change of the incident light intensity of the reference arm to match the light intensity of the measurement arm, obtaining a better signal contrast, and improving the measurement accuracy. Description of the Drawings

[0021] For the convenience of those skilled in the art to understand, the present utility model will be further described below with reference to the accompanying drawings.

[0022] Figure 1 is the first three-dimensional view of the present utility model;

[0023] Figure 2 is the top view of the present utility model;

[0024] Figure 3 is the left view of the present utility model;

[0025] Figure 4 is the second three-dimensional view of the present utility model;

[0026] Main Element Symbol Description:

[0027] In the figure: 1. Filter; 2. Incident optical fiber; 3. Collimating lens; 4. First base; 5. Rotating shaft; 6. Second base; 7. First fixing block; 8. Second fixing block. Detailed implementation manners

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0029] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0030] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0031] Referring to Figures 1 to 4 , a light intensity matching structure for dual-path low-coherence interference measurement disclosed by the present utility model includes a support assembly, a control assembly, and an optical path assembly. The control assembly is rotatably connected to the support assembly;

[0032] The support assembly includes a first base 4, a second base 6, and a second fixing block 8. The second fixing block 8 is fixedly connected to the upper part of the rear side of the second base 6;

[0033] The control assembly includes a rotating shaft 5 and a first fixing block 7. The first fixing block 7 is fixedly connected to the front end of the rotating shaft 5. The rotating shaft 5 is rotatably connected to the first base 4 and the second base 6;

[0034] The optical path component includes a filter 1, an incident optical fiber 2, and a collimating lens 3. The filter 1 is fixedly connected to a rotating shaft 5 in an inclined manner to prevent the reflected light from re-entering the optical path and interfering with the interference signal. The incident optical fiber 2 is fixedly connected to the front end of the collimating lens 3, and the collimating lens 3 is fixedly connected to a second fixing block 8. A through hole is provided in the middle of the upper part of the second base 6, and the collimating lens 3 passes through the through hole of the second base 6 to facilitate the positioning of the incident optical fiber 2 and the collimating lens 3.

[0035] Referring to Figures 1 to 4 , the filter 1 is an optical flat glass plated with a transmittance of 0 to 1 along the circumferential direction. The filter 1 is driven to rotate by the rotating shaft 5 to facilitate the control of the transmitted light intensity, realize the change of the incident light intensity of the reference arm, make it match the light intensity of the measurement arm, obtain a better signal contrast, and improve the measurement accuracy. The first base 4 is arranged in an inverted T shape. A through hole is provided at the upper end of the vertical section of the T shape of the first base 4, and the rotating shaft 5 passes through the through hole of the first base 4. A semi-circular notch is provided on one side of the upper part of the second base 6. The semi-circular notch of the second base 6 matches the rotating shaft 5 to position the control component and the filter 1, so that the positions of the control component and the filter 1 correspond to the positions of the incident optical fiber 2 and the collimating lens 3 to facilitate the control of the light intensity. The first fixing block 7 is arranged in a bolt shape.

[0036] The working principle and usage process of the present utility model: The device is installed at a suitable position through the first base 4 and the second base 6.

[0037] The rotating shaft 5 is rotated by the first fixing block 7 to drive the filter 1 to rotate for controlling the transmitted light intensity. The light passes through the filter 1, cooperates with the collimating lens 3 and the incident optical fiber 2, and is emitted to the reflector for subsequent signal analysis.

[0038] The above is only a preferred embodiment of the present utility model and does not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with the preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to obtain an equivalent embodiment with equivalent changes, but as long as it does not depart from the technical content of the present utility model, any brief modification, equivalent change and modification made to the above embodiment based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. An optical intensity matching structure for dual - optical - path low - coherence interference measurement, characterized in that: It includes a supporting assembly, a control assembly and an optical path assembly, wherein the control assembly is rotatably connected to the supporting assembly; The support assembly comprises a first base (4), a second base (6) and a second fixing block (8), wherein the second fixing block (8) is fixedly connected to the upper rear portion of the second base (6); The control assembly comprises a rotating shaft (5) and a first fixed block (7), wherein the first fixed block (7) is fixedly connected to the front end of the rotating shaft (5), and the rotating shaft (5) is rotatably connected to the first base (4) and the second base (6); The optical path component comprises a filter (1), an incident optical fiber (2) and a collimating lens (3); the filter (1) is fixedly connected to the rotating shaft (5) in an inclined manner; the incident optical fiber (2) is fixedly connected to the front end of the collimating lens (3); and the collimating lens (3) is fixedly connected to the second fixing block (8).

2. The intensity matching structure for dual - optical - path low - coherence interference measurement according to claim 1, wherein: The filter (1) is an optical flat glass plated with a transmittance of 0 to 1 along the circumferential direction.

3. A light intensity matching structure for dual - optical - path low - coherence interference measurement according to claim 1, wherein: The first base (4) is arranged in an inverted T shape.

4. A light intensity matching structure for dual - optical - path low - coherence interference measurement according to claim 3, characterized in that: A through hole is provided at the upper end of the T-shaped vertical section of the first base (4), and the rotating shaft (5) passes through the through hole of the first base (4).

5. A light intensity matching structure for dual - optical - path low - coherence interference measurement according to claim 1, characterized in that: A semicircular notch is provided on one side of the upper portion of the second base (6).

6. A light intensity matching structure for dual - optical - path low - coherence interference measurement according to claim 5, characterized in that: The semicircular notch of the second base (6) matches the rotating shaft (5).

7. A light intensity matching structure for dual - optical - path low - coherence interference measurement according to claim 1, characterized in that: A through hole is provided in the middle of the upper portion of the second base (6), and the collimating lens (3) passes through the through hole of the second base (6).

8. A light intensity matching structure for dual - optical - path low - coherence interference measurement according to claim 1, characterized in that: The first fixing block (7) is arranged in a bolt-shaped manner.

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