Optical fiber refractive index measurement auxiliary device for eliminating laser speckles

Abstract

The utility model belongs to the field of optical fiber refractive index measurement, and provides an optical fiber refractive index measurement auxiliary device capable of eliminating laser speckles, which comprises a fixing frame, a vertical frame is arranged on the fixing frame, a driving component and a motor fixing seat are arranged on the vertical frame, and the motor fixing seat is arranged on the vertical frame. The driving assembly is used for driving the motor fixing seat to move up and down, a motor is arranged on the motor fixing seat, and a dodging sheet is arranged on a driving shaft of the motor. When the device is used for eliminating laser speckles, firstly, after the dodging sheet moves downwards in place, laser irradiates on the dodging sheet, meanwhile, the motor is started, the dodging sheet rotates at a high speed, the dodging sheet homogenizes the laser to eliminate the laser speckles, and meanwhile, a light beam penetrates through the round opening and irradiates on the lens focusing optical piece. And then the lens focusing optical piece performs focusing adjustment on the light beam, and after the focusing operation is completed, the dodging sheet moves upwards, so that subsequent normal optical fiber refractive index measurement can be performed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of optical fiber refractive index measurement, especially relates to a kind of optical fiber refractive index measurement auxiliary device for eliminating laser speckle. BACKGROUND

[0002] Laser is widely used in the field of optical fiber refractive index measurement due to its good monochromaticity, high brightness and other advantages. However, in the actual measurement process, laser speckle phenomenon becomes a key obstacle affecting the accuracy and reliability of measurement. Laser speckle is a random bright and dark speckle produced by the interference of light when laser propagates in a non-uniform medium. The appearance of such speckle will cause the measurement signal to be extremely unstable, greatly reduce the measurement accuracy, and even cause a large measurement error.

[0003] Currently, before measuring the refractive index of optical fiber, the laser emitted by the laser is usually directly irradiated on the lens focusing optical part, and then the lens focusing optical part is adjusted. Since laser speckle is formed during irradiation, the accuracy of lens focusing optical part focusing adjustment is affected, resulting in errors in subsequent measurement results. UTILITY MODEL CONTENT

[0004] In view of the above problems, the purpose of the utility model is to provide an optical fiber refractive index measurement auxiliary device for eliminating laser speckle, which aims to solve the problem of inaccurate focusing of lens focusing optical part in existing optical fiber refractive index measurement device, resulting in errors in subsequent measurement results.

[0005] The utility model adopts the following technical solutions:

[0006] The optical fiber refractive index measurement auxiliary device for eliminating laser speckle includes a fixed frame, a stand on the fixed frame, a drive assembly and a motor fixed seat provided on the stand, the drive assembly for driving the motor fixed seat to move up and down, a motor provided on the motor fixed seat, a light uniformizing sheet provided on the drive shaft of the motor, a laser output assembly provided inwardly on the fixed frame, the laser output assembly facing the light uniformizing sheet, and a round opening provided on the back of the fixed frame opposite to the light uniformizing sheet.

[0007] Further, the top of the fixed frame is a Z-axis motor fixed seat of type 7, a notch is opened at the front end of the Z-axis motor fixed seat, and the motor fixed seat is located in the notch.

[0008] Further, a pair of cross roller guides is provided in the notch, and the motor fixed seat is slidingly installed on the cross roller guides.

[0009] Further, the drive assembly is a Z-axis motor installed on the top of the Z-axis motor fixed seat, the drive shaft of the Z-axis motor is provided with a connecting screw rod, a silk sleeve is provided in the motor fixed seat, and the connecting screw rod is located in the silk sleeve.

[0010] Further, the bottom of the Z-axis motor fixing seat is internally provided with a C-shaped bottom block, and the bottom of the connecting screw rod is rotatably installed on the C-shaped bottom block.

[0011] The beneficial effects of the present application are as follows:

[0012] 1. The laser homogenization is realized by high-speed rotation of the homogenizing plate driven by the motor, and the speckle is effectively eliminated, and the homogenized light beam is precisely focused and adjusted by the lens focusing optical element arranged on the back of the stand, and the two work together to significantly improve the accuracy and reliability of the fiber refractive index measurement.

[0013] 2. The height position of the homogenizing plate can be accurately adjusted by cooperation of the Z-axis motor, the connecting screw rod, the wire sleeve and the cross roller guide rail, and after the focusing adjustment is completed, the homogenizing plate can be timely moved up, which is convenient for subsequent fiber refractive index measurement. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The present application provides a fiber refractive index measurement auxiliary device Figure 1 .

[0015] Figure 2 The present application provides a fiber refractive index measurement auxiliary device Figure 2 .

[0016] Figure 3 The present application provides a homogenizing plate mounting schematic view. DETAILED DESCRIPTION

[0017] In order to make the patent purposes, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0018] In order to illustrate the technical solutions of the present application, the following specific examples are used to illustrate the technical solutions of the present application.

[0019] In order to facilitate the description, only parts related to the embodiments of the present application are shown.

[0020] In combination with Figures 1-3As shown, the fiber refractive index measurement auxiliary device for eliminating laser speckle includes a fixed frame 1, a stand 2 is arranged on the fixed frame 1, a driving assembly and a motor fixing seat 3 are arranged on the stand, the driving assembly is used for driving the motor fixing seat to move up and down, a motor 4 is arranged on the motor fixing seat 3, a homogenizing plate 5 is arranged on the driving shaft of the motor 4, a laser output assembly 6 is further arranged inward on the fixed frame 1, the laser output assembly 6 is arranged towards the homogenizing plate 5, and a round opening 13 is formed on the back of the fixed frame and faces the homogenizing plate.

[0021] Laser is often used for fiber refractive index measurement due to its good monochromaticity and high brightness, but the emergence of laser speckle seriously interferes with the accuracy and reliability of the measurement result in the measurement process. Laser speckle is random bright and dark speckle produced by light interference when laser propagates in a non-uniform medium, which can cause unstable measurement signal, low measurement accuracy and even measurement error. Therefore, the device can be used to eliminate laser speckle when measuring fiber refractive index, overcome the above problems, and improve the accuracy and reliability of the measurement result.

[0022] In the embodiment, a lens focusing optical part is arranged on the back of the stand and faces the round opening, and the laser output assembly outputs a laser beam. In the embodiment, the laser output assembly can be a laser or a beam splitting cube. The beam splitting cube is shown in the figure, and a laser source is arranged at the entrance end of the beam splitting cube. The laser source can emit laser towards the beam splitting cube, and then the laser is split by the beam splitting cube and then output.

[0023] When the device is used to eliminate laser speckle, first, the homogenizing plate is moved downward as required. After the homogenizing plate is moved into position, laser irradiates on the homogenizing plate. At the same time, the motor is started, and the motor drives the homogenizing plate to rotate at high speed. The homogenizing plate homogenizes the laser, thereby effectively eliminating laser speckle. At the same time, the homogenized light beam passes through the round opening and irradiates on the lens focusing optical part. Then, the lens focusing optical part is adjusted. Since the rotating homogenizing plate eliminates laser speckle, the visual field is clearer during the focusing adjustment, thereby facilitating rapid and accurate lens focusing adjustment. After the focusing adjustment operation is completed, the homogenizing plate is controlled to move upward under the driving of the driving assembly and leave the path of the light beam. Then, subsequent normal fiber refractive index measurement can be performed.

[0024] In the structure, as Figures 2-3 the top of the fixed frame 1 is a Z-axis motor fixing seat 7 of type 7, a notch 8 is formed at the front end of the Z-axis motor fixing seat 7, and the motor fixing seat 3 is located in the notch 8. A pair of left and right cross roller guides 9 are arranged in the notch, and the motor fixing seat 3 is slidingly installed on the cross roller guides 9.

[0025] The motor fixing base is installed in the gap through a pair of the cross roller guide rails. Before the laser speckle is eliminated by using the device, the height position of the light homogenizing plate needs to be adjusted, at which time the motor fixing base moves vertically in the gap on the cross roller guide rails to adjust the position.

[0026] As a specific structure, as shown in Figure 3 The driving assembly is a Z-axis motor 10 installed on the top of the Z-axis motor fixing base 7, and the driving shaft of the Z-axis motor 10 is provided with a connecting screw rod 11, and the motor fixing base 3 is provided with a wire sleeve, and the connecting screw rod 11 is located in the wire sleeve. Alternatively, the connecting screw rod 11 is directly screwed with the motor fixing base 3.

[0027] When the light homogenizing plate needs to move up and down, the Z-axis motor drives the connecting screw rod to rotate, and the motor fixing base moves up and down along the cross roller guide rails under the driving of the connecting screw rod, and the light homogenizing plate moves vertically, and after the light homogenizing plate is moved to the position, the Z-axis motor stops working.

[0028] In addition, the bottom of the Z-axis motor fixing base 7 is provided with a C-shaped bottom block 12 inward, and the bottom of the connecting screw rod 11 is rotatably installed on the C-shaped bottom block. In this structure design, on the one hand, the C-shaped bottom block can enhance the stability and reliability of the rotation of the connecting screw rod, and on the other hand, it is used for avoiding the motor and limiting the lowest position of the motor fixing base 3, preventing it from being separated from the cross roller guide rails.

[0029] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An optical fiber refractive index measurement auxiliary device for eliminating laser speckle, characterized by: The auxiliary device for eliminating laser speckle in optical fiber refractive index measurement comprises a fixing frame, a stand on the fixing frame, a driving assembly and a motor fixing seat on the stand, the driving assembly being used to drive the motor fixing seat to move up and down, a motor being arranged on the motor fixing seat, a light uniformizing sheet being arranged on the driving shaft of the motor, a laser output assembly being further arranged on the fixing frame, the laser output assembly being arranged towards the light uniformizing sheet, and a round opening being formed on the back of the fixing frame opposite to the light uniformizing sheet.

2. The device for refractive index measurement of optical fiber to eliminate speckle of laser according to claim 1, wherein: The top of the fixing frame is a Z-axis motor fixing seat of type 7, a notch being formed on the front end of the Z-axis motor fixing seat, and the motor fixing seat being located in the notch.

3. The device for refractive index measurement of optical fiber to eliminate speckle of laser according to claim 2, wherein: A pair of cross roller guides is arranged in the notch, and the motor fixing seat is slidingly installed on the cross roller guides.

4. The apparatus for refractive index measurement of optical fiber to eliminate speckle of laser light according to claim 3, wherein: The driving assembly is a Z-axis motor installed on the top of the Z-axis motor fixing seat, a connecting screw being arranged on the driving shaft of the Z-axis motor, a wire sleeve being arranged in the motor fixing seat, and the connecting screw being located in the wire sleeve.

5. The apparatus for refractive index measurement of optical fiber to eliminate speckle of laser light according to claim 4, wherein: The bottom of the Z-axis motor fixing seat is inwardly provided with a C-shaped bottom block, and the bottom of the connecting screw is rotatably installed on the C-shaped bottom block.

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