Polarizer fixing tool and light source polarization adjustment system using same

Abstract

The utility model belongs to the technical field of absolute gravimeters, and particularly relates to a polaroid fixing tool and a light source polarization adjusting system using the same. The polaroid fixing tool comprises a sleeve and a polaroid fixing mechanism, the interior of the sleeve is hollow, an abutting structure is formed on one side of the sleeve, the sleeve is connected with the light outlet nozzle through a connecting structure, and the sleeve can conduct circumferential movement adjustment and / or axial movement adjustment relative to the light outlet nozzle; the polaroid fixing mechanism comprises a clamping column, a light-transmitting cylinder structure and a clamping structure, light-transmitting hole channels allowing light beams to pass through are formed in the clamping column and the light-transmitting cylinder structure in a penetrating mode, and the light-transmitting cylinder structure abuts against the sleeve through an abutting structure; the light source polarization adjusting system comprises a laser, a coupler is installed on the laser, the coupler is provided with a light outlet nozzle, and a polaroid fixing tool is assembled on the light outlet nozzle. According to the light source polarization adjustment system, the polarization direction of the coupler on the laser can be adjusted only through one-time adjustment, operation is convenient, and adjustment time is effectively shortened.

Description

Technical Field

[0001] The utility model belongs to the technical field of absolute gravimeters, and in particular relates to a polarizing plate fixing tool and a light source polarization adjustment system using the same. Background Art

[0002] The laser interferometer absolute gravimeter uses laser interferometer technology to measure the value of gravitational acceleration. Its working principle is to use the change of laser interference fringes to measure gravitational acceleration. The laser beam is divided into two paths, one of which is reflected back to the receiver as a reference beam, and the other is reflected back to the receiver through the interference system composed of a beam splitter and a mass block. When the mass block is accelerated by gravity, the optical path difference of the interference system will be changed, thereby changing the displacement of the interference fringes. By counting and analyzing the interference fringes, the magnitude and direction of the gravitational acceleration on the mass block can be obtained.

[0003] Laser interferometer absolute gravimeters currently generally use polarization-maintaining optical fibers to guide lasers from lasers into interferometers for interference to measure the falling distance of falling objects. Lasers are transmitted through optical fibers and emitted from collimators, and irradiated onto beam splitters for beam splitting. The polarization direction of polarized light emitted from polarization-maintaining optical fibers directly affects the ratio of beam splitting on the beam splitter behind. Therefore, it is particularly important for polarization-maintaining optical fibers to maintain a certain and unchanged polarization direction. The way to keep the polarization direction of polarized light emitted from collimators as unchanged as possible is to select high-quality polarization-maintaining optical fibers. In addition, on this basis, a more important point is to align the polarization direction of the spatial light inside the laser with the polarization direction of the polarization-maintaining optical fiber. Under the conditions of polarization-maintaining optical fiber selection, only the spatial angle of the coupler on the laser can be adjusted to align with the polarization direction of the polarization-maintaining optical fiber. Of course, the polarization direction of the laser directly transmitting spatial light into the interferometer is more stable.

[0004] The existing laser interferometer absolute gravimeter generally uses a polarization analyzer to adjust the alignment accuracy between the polarization direction of the coupler on the laser and the polarization direction of the polarization-maintaining fiber. The laser emits light from an optical fiber, so a coupler is installed on the laser. The staff adjusts the polarization by adjusting the coupler. The traditional adjustment method is to connect an optical fiber to the coupler and connect it to the polarization analyzer to check the polarization degree. If the polarization degree is not enough, the light outlet mouth on the coupler is rotated, because rotating the light outlet mouth will affect the fiber coupling efficiency, resulting in a decrease in light intensity or even no light. However, polarization analysis to measure the polarization degree requires the fiber to emit light with a certain light intensity. Therefore, the general adjustment method is to rotate the light outlet mouth, adjust the fiber coupling to make the fiber emit light, and then measure the polarization degree. If the measurement is not appropriate, the light outlet mouth must be rotated again. Repeated blind adjustment is performed to approach the appropriate polarization degree. Due to the adjustment process, rotating the coupler output port can easily make the fiber not emit light, so it is often necessary to fine-tune and rotate the coupler output port a little, and then adjust the optical coupling to make the fiber emit light. According to the polarization degree shown by the polarization analyzer, fine-tune and rotate again, and then adjust the optical coupling again. The process is troublesome and time-consuming. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art in that when measuring polarization degree, the adjustment process of optical fiber coupling and light output is cumbersome, time-consuming and requires repeated adjustment, and to provide a polarizer fixing tool and a light source polarization adjustment system using the same.

[0006] The technical solution adopted by the utility model to solve this problem is:

[0007] A polarizing plate fixing tool, comprising:

[0008] A sleeve, which is hollow inside and has an abutment structure formed on one side, and the sleeve is connected to the light outlet nozzle through a connecting structure, so as to achieve circumferential movement adjustment and / or axial movement adjustment of the sleeve relative to the light outlet nozzle;

[0009] The polarizer fixing mechanism comprises a clamping column, a light-through tube structure and a clamping structure formed between the two for adapting and clamping the polarizer. The clamping column and the light-through tube structure are both provided with a light-through channel for light beams to pass through. The light-through tube structure is mutually abutted with a sleeve through an abutment structure.

[0010] In the above technical solution, the sleeve is a hollow sleeve structure, and the abutment structure is an annular protrusion protruding from one side of the sleeve toward the central axis of the sleeve.

[0011] In the above technical solution, the connection structure includes threads arranged on the inner circumference of the sleeve and threadedly connected to the light outlet nozzle. Specifically, the sleeve is hollow inside and has threads connected to the light outlet nozzle on the inner circumference.

[0012] In the above technical solution, the light tube structure includes a light tube A, a light tube B and a light tube C.

[0013] In the above technical solution, the polarizer fixing tool includes a sleeve, a polarizer, a clamping column, a light-through tube A, a light-through tube B and a light-through tube C. The clamping column, the light-through tube A, the light-through tube B and the light-through tube C are arranged in sequence, and the sleeve is arranged on the outer circumferential surface of the clamping column and the light-through tube A.

[0014] In the above technical solution, the sleeve, the clamping column, the light tube A, the light tube B, and the light tube C are coaxially arranged, the polarizer is arranged between the clamping column and the light tube A, and the clamping column, the light tube A, the light tube B, and the light tube C are all provided with holes for light beams to pass through.

[0015] In the above technical solution, the outer diameter of the light-transmitting cylinder B is smaller than the outer diameters of the light-transmitting cylinder A and the light-transmitting cylinder C to form a step, and the abutting structure abuts against the step of the light-transmitting cylinder.

[0016] In the above technical solution, the clamping structure includes:

[0017] A first groove is formed on a side of the clamping column opposite to the light tube A;

[0018] A second groove is formed on one side of the light tube A opposite to the clamping column;

[0019] The first groove and the second groove together enclose a clamping space for fixing and clamping the polarizer, and the clamping space is adapted to the shape of the polarizer.

[0020] The second invention object of the utility model is to provide a light source polarization adjustment system, including a laser, on which a coupler is installed, and the coupler has a light outlet mouth, and the light outlet mouth is equipped with the above-mentioned polarizer fixing tool, and the polarizer fixing tool can be circumferentially rotated and adjusted along the axis of the light beam, and can also be axially adjusted forward and backward along the axis of the light beam, and is used to fix the polarizer on the light outlet mouth.

[0021] In the above technical solution, the light source polarization adjustment system also includes a power meter, which includes a power sensor and a power display panel. The power sensor and the power display panel are located on the side of the polarizer fixing fixture to which the light beam is incident.

[0022] The utility model has the advantages and positive effects that: the light source polarization adjustment system of the utility model adjusts the polarization direction of the coupler on the laser, and only needs to be adjusted once, which is convenient to operate and effectively improves the adjustment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The technical solution of the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for the purpose of explanation and are not intended to limit the scope of the utility model. In addition, unless otherwise specified, these drawings are only intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0024] Figure 1 is a system schematic diagram of Embodiment 2 of a light source polarization adjustment system of the present invention;

[0025] Figure 2 It is a cross-sectional view of a polarizer fixing tool of Example 1 of a light source polarization adjustment system of the present invention;

[0026] Figure 3 It is a front view of a polarizer fixing tool of Example 1 of a light source polarization adjustment system of the present invention;

[0027] Figure 4 It is a side view of a polarizer fixing tool of Example 1 of a light source polarization adjustment system of the present invention.

[0028] Description of reference numerals:

[0029] 1. Light beam; 2. Sleeve; 3. Polarizer; 4. Clamp; 5. Light tube A; 6. Light tube B; 7. Light tube C; 8. Power sensor; 9. Power display panel. DETAILED DESCRIPTION

[0030] First of all, it should be noted that the specific structure, features and advantages of the present invention will be specifically described below by way of example, but all descriptions are only for illustration and should not be understood as limiting the present invention in any way. In addition, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature displayed or implied in the drawings, can still be combined or deleted between these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned in this document. In addition, in order to simplify the drawings, the same or similar technical features may be marked only in one place in the same drawing.

[0031] In the present utility model, unless otherwise clearly specified and limited, the terms "installation", "setting", "connection", "fixation", "screwing" and the like should be understood in a broad sense, for example, it 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined, for ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances. The present utility model is described in detail below in conjunction with the accompanying drawings. Example

[0032] A polarizing plate fixing tool comprises a sleeve 2 and a polarizing plate fixing mechanism, wherein:

[0033] The sleeve 2 is used to connect the light outlet nozzle, the interior of which is hollow and one side of which is formed with an abutment structure. The sleeve 2 is connected to the light outlet nozzle through the connection structure, and the sleeve 2 can be adjusted for circumferential movement and / or axial movement relative to the light outlet nozzle;

[0034] The polarizer fixing mechanism is used to fix the polarizer, which includes a clamping column 4, a light-through tube structure, and a clamping structure formed between the two for adapting and clamping the polarizer 3. The clamping column 4 and the light-through tube structure are both penetrated by a light-through channel for the light beam 1 to pass through, and the light-through tube structure is mutually abutted with the sleeve 2 through an abutment structure.

[0035] Reference Figures 2 to 4 The polarizer fixing tooling includes a sleeve 2, a polarizer 3, a clamping column 4, a light-through tube A5, a light-through tube B6 and a light-through tube C7. The sleeve 2 can be installed on the light outlet nozzle, and can be adjusted by circumferential rotation and / or axial forward and backward movement relative to the light outlet nozzle. The clamping column 4, the light-through tube A5, the light-through tube B6 and the light-through tube C7 are used to install the polarizer 3. The clamping column 4, the light-through tube A5, the light-through tube B6 and the light-through tube C7 are all penetrated by holes for the light beam 1 to pass through and are arranged coaxially in sequence from left to right. When it is necessary to adjust the polarization direction of the coupler on the laser, it is only necessary to rotate the sleeve and the polarizer fixing mechanism. The operation is convenient and the adjustment efficiency is effectively improved.

[0036] Furthermore, in this embodiment, it can also be considered that the sleeve 2 is a hollow sleeve structure, and the abutment structure is an annular protrusion protruding from one side of the sleeve 2 toward the central axis direction of the sleeve 2.

[0037] Furthermore, in this embodiment, it can be considered that the connection structure includes a thread provided on the inner circumference or outer circumference of the sleeve 2 and threadedly connected to the light outlet nozzle. The sleeve 2 is movable and can rotate along the axis of the light beam 1 or move forward and backward along the axis of the light beam 1. The main function is to screw it onto the light outlet nozzle of the coupler to fix the polarizer 3 and the light outlet nozzle together.

[0038] Furthermore, in this embodiment, it can also be considered that the light-through tube structure includes a light-through tube A5, a light-through tube B6 and a light-through tube C7, the clamping column 4, the light-through tube A5, the light-through tube B6 and the light-through tube C7 are arranged in sequence, and the sleeve 2 is arranged on the outer circumferential surface of the clamping column 4 and the light-through tube A5.

[0039] Furthermore, in this embodiment, it can also be considered that the sleeve 2, the clamping column 4, the light tube A5, the light tube B6, and the light tube C7 are coaxially arranged, and the polarizer 3 is arranged between the clamping column 4 and the light tube A5.

[0040] Furthermore, in this embodiment, it can also be considered that the outer diameter of the light tube B6 is smaller than the outer diameters of the light tube A5 and the light tube C7 to form a step, and the abutment structure abuts against the step of the light tube. Figure 2 As shown, the outer diameter of the light-through cylinder B6 is smaller than the outer diameters of the light-through cylinders A5 and C7 to form a step, and one side of the sleeve 2 is axially protruding and abutting against the step, thereby limiting the range of movement of the sleeve 2.

[0041] Furthermore, in this embodiment, it can also be considered that the clamping structure includes:

[0042] A first groove is formed on a side of the clamping column 4 opposite to the light tube A5;

[0043] A second groove is formed on one side of the light tube A5 opposite to the clamping column 4;

[0044] The first groove and the second groove together enclose a clamping space for fixing and clamping the polarizer 3 , and the clamping space is adapted to the shape of the polarizer 3 .

[0045] like Figure 2 As shown, the clamping column 4 has a groove for clamping the polarizer 3 on one side relative to the light tube A5, and the light tube A5 has a groove for clamping the polarizer 3 on one side relative to the clamping column 4. The two grooves jointly restrict the polarizer 3 and fix the polarizer 3 through AB glue. Example

[0046] A light source polarization adjustment system includes a laser, on which a coupler is installed, and the coupler has a light outlet. The light outlet is equipped with the polarizer fixing fixture described in the above embodiment 1, and the polarizer fixing fixture can be adjusted circumferentially along the axis of the light beam 1, and can also be adjusted axially forward and backward along the axis of the light beam 1, and is used to fix the polarizer 3 on the light outlet.

[0047] Furthermore, in this embodiment, it can also be considered that the light source polarization adjustment system also includes a power meter, and the power meter includes a power sensor 8 and a power display panel 9, and the power sensor 8 and the power display panel 9 are located on the side of the polarizer fixing tool to which the light beam 1 is directed.

[0048] Reference Figures 1 to 4 This embodiment includes a polarizer fixing tool and a power meter. The polarizer fixing tool includes a sleeve 2, a polarizer 3, a clamping column 4, a light-through tube A5, a light-through tube B6 and a light-through tube C7. The clamping column 4, the light-through tube A5, the light-through tube B6 and the light-through tube C7 are all penetrated with holes for the light beam 1 to pass through and are arranged coaxially in sequence from left to right. The sleeve 2 is hollow inside and has a thread connected to the light outlet nozzle on the inner circumference, and the sleeve 2 is located on the outside of the clamping column 4 and the light-through tube A5; the power meter includes a power sensor 8 and a power display panel 9, and the power sensor 8 and the power display panel 9 are located on the side of the polarizer fixing tool to which the light beam 1 is directed.

[0049] A method for using a light source polarization adjustment system in Embodiment 2 of the present invention is as follows:

[0050] S1. Light up the laser (the laser is not shown) and wait for the laser to lock. After locking, the power and frequency are in a stable state. At this time, the light outlet of the coupler on the laser outputs spatial light with stable power.

[0051] S2. After the laser is locked, screw the polarizer fixing fixture onto the light outlet of the coupler through the sleeve 2. After tightening, the polarizer 3 and the light outlet are fixedly connected together in relative position. At this time, the laser outputs spatial light through the light outlet, and the light beam 1 passes through the polarizer 3 and hits the power probe 8, and the power display panel 9 displays the power.

[0052] S3. The power probe 8 is fixed in place, and the three nails fixing the light outlet on the coupler are loosened with a screwdriver, and the light outlet is rotated to make the power on the power display panel 9 the strongest.

[0053] S4. Tighten the three screws and remove the polarizer fixing fixture. At this time, the polarization adjustment of the laser is completed.

[0054] S5. Since tightening the light outlet nozzle will affect the coupling efficiency of the optical fiber, it is necessary to insert the optical fiber into the light outlet nozzle, tighten it, and then adjust the five knobs X, Y, Z1, Z2, and Z3 on the coupler that control the coupling efficiency to make the optical fiber emit light to a certain intensity (make the optical fiber emit light to an intensity that can observe polarization).

[0055] The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. Among them, the same parts are represented by the same figure numerals. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively. Therefore: All equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A polarizer fixing tool, characterized in that: include: A sleeve (2) having a hollow interior and an abutment structure formed on one side, wherein the sleeve (2) is connected to the light outlet nozzle via a connection structure, and is used to achieve circumferential movement adjustment and / or axial movement adjustment of the sleeve (2) relative to the light outlet nozzle; A polarizing plate fixing mechanism comprises a clamping column (4), a light-through tube structure, and a clamping structure formed between the two and used for adapting and clamping a polarizing plate (3); the clamping column (4) and the light-through tube structure are both provided with a light-through channel for a light beam (1) to pass through; the light-through tube structure is mutually abutted with a sleeve (2) via an abutment structure.

2. The polarizer fixing tool according to claim 1, characterized in that: The sleeve (2) is a hollow sleeve structure, and the abutment structure is an annular protrusion formed by protruding from one side of the sleeve (2) in the direction of the central axis of the sleeve (2).

3. The polarizer fixing tool according to claim 2, characterized in that: The connection structure comprises a thread provided on the inner circumferential surface of the sleeve (2) and threadedly connected to the light outlet nozzle.

4. The polarizer fixing tool according to claim 1, characterized in that: The light-through tube structure comprises a light-through tube A (5), a light-through tube B (6) and a light-through tube C (7); the clamping column (4), the light-through tube A (5), the light-through tube B (6) and the light-through tube C (7) are arranged in sequence, and the sleeve (2) is arranged on the outer circumferential surfaces of the clamping column (4) and the light-through tube A (5).

5. The polarizer fixing tool according to claim 4, characterized in that: The sleeve (2), the clamping column (4), the light-transmitting cylinder A (5), the light-transmitting cylinder B (6), and the light-transmitting cylinder C (7) are coaxially arranged, and the polarizing plate (3) is arranged between the clamping column (4) and the light-transmitting cylinder A (5).

6. The polarizer fixing tool according to claim 4, characterized in that: The outer diameter of the light-through cylinder B (6) is smaller than the outer diameters of the light-through cylinder A (5) and the light-through cylinder C (7) to form a step, and the abutment structure abuts against the step of the light-through cylinder structure.

7. The polarizer fixing tool according to claim 4, characterized in that: The clamping structure comprises: A first groove formed on a side of the clamping column (4) opposite to the light-transmitting cylinder A (5); A second groove formed on a side of the light-transmitting cylinder A (5) opposite to the clamping column (4); The first groove and the second groove together enclose a clamping space for fixing and clamping the polarizing plate (3), and the clamping space is adapted to the shape of the polarizing plate (3).

8. A light source polarization calibration system, comprising a laser, on which a coupler is mounted, wherein the coupler has a light outlet, and wherein: The light outlet nozzle is equipped with a polarizer fixing fixture as described in any one of claims 1 to 7, and the polarizer fixing fixture can be adjusted circumferentially along the axis of the light beam (1), and can also be adjusted axially forward and backward along the axis of the light beam (1), and is used to fix the polarizer (3) on the light outlet nozzle.

9. The light source polarization calibration system according to claim 8, characterized in that: It also includes a power meter, which includes a power sensor (8) and a power display panel (9), and the power sensor (8) and the power display panel (9) are located on the side of the polarizing plate fixing fixture to which the light beam (1) is incident.

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