KR200281273Y1 - The device for measurement rasidual stress of optical fiber - Google Patents

Abstract

The present invention relates to an apparatus for measuring the residual stress of an optical fiber, and more particularly, the residual stress generated in the optical fiber manufacturing process by miniaturizing a device capable of measuring the residual stress remaining in the optical fiber by using a porterastic effect. The present invention relates to a device for measuring the residual stress of an optical fiber, which is capable of more effectively blocking and preventing light scattering caused by the light scattering and the resulting light loss, and thus simplifying transportation and use. An intermediate vertical support having a first reflecting mirror 22 and a built-in light diffuser 23, a zoom lens 24, and an aperture 25 on a horizontal optical axis converted by the first reflecting mirror 22. (2) is formed above one side of the base plate 1; The upper horizontal support (3) integrally protrudes toward the upper front of the intermediate vertical support (2), CCD camera 32 and the polarizer (on the optical axis perpendicular to the front and rear sides of the upper horizontal support (3) 33 is provided with a built-in camera cap 31 and a laser cap 34 for protecting the outer side of the upper side of the light source 21 penetrating the upper horizontal support 3, the lower front side of the upper horizontal support 3 A revolve 4 having a plurality of objective lenses 40 forming the same optical axis as the CCD camera 32; A second reflecting mirror symmetrical with the first reflecting mirror 22 while forming the same optical axis as the diaphragm 25 embedded in the intermediate vertical support 2 at the center of the front base plate 1 of the intermediate vertical support 2. A base 5 provided with 50 is formed; The rotating polarizer 61 and the wave plate 62 on the vertical optical axis, which is converted by the second reflection mirror 50 and forms the same optical axis as the revolve 4, in one middle portion of the base 5, A condenser lens 63 is built in, and a measuring table 6 having a through hole 64 is formed in the center of the image surface; The rail 7 is formed on the upper surface of the base 5 on both sides of the measuring table 6 so that the optical fiber seating jig 70 is movable in a linear direction, thereby utilizing the residual stress remaining in the optical fiber by using the porterastic effect. It can not only make the device that can be measured by the practical use, but also has the effect of more effectively blocking and preventing light scattering and the resulting light loss due to the residual stress generated during the optical fiber manufacturing process, There is an effect that can be made easy to transport and use.

Description

Residual stress measuring apparatus of optical fiber {The device for measurement rasidual stress of optical fiber}

The present invention relates to an apparatus for measuring the residual stress of an optical fiber, and more particularly, the residual stress generated in the optical fiber manufacturing process by miniaturizing a device capable of measuring the residual stress remaining in the optical fiber by using a porterastic effect. The present invention relates to a device for measuring the residual stress of an optical fiber, which makes it easy to transport and use while preventing and preventing light scattering and light loss caused by the light beam more effectively.

In general, the stress generated during the manufacturing process of the optical fiber is not removed after the fabrication and some remain in the optical fiber, which is called residual stress. This residual stress measurement is used to produce high quality optical fiber. And it is very important for the development of special optical fiber and its characteristics.

Residual stresses generated at high temperature drawing process, which is the production process of optical fiber, increase the optical loss due to light scattering of the optical fiber and cause the refractive index to be changed by the photoelastic effect. The refractive index of the medium changes depending on the direction of the remaining stress. The photoelastic effect causes the refractive index of the optical fiber or its base material to change depending on the polarization direction of light.

Therefore, in order to manufacture high quality optical fiber, it is necessary to develop an optical fiber production (drawing) technology that suppresses residual stress. In order to develop such residual stress suppression technology, it is essential to develop measurement equipment capable of precisely measuring the residual stress of an optical fiber.

Conventionally for such a measurement, as shown in Figure 1 "measurement device and method for measuring the residual stress of the optical fiber and photoelastic effect" (Korean Patent No. 2001-91066) has been proposed,

It is a light source 100; A rotatable light diffuser (101) for suppressing spatial coherence of light emitted from the light source (100) spaced apart from the light source (100) by a predetermined distance; An optical concentrator (102) for condensing the light passing through the optical diffuser at a position where the optical fiber (P) is installed; A polarizer (103) for polarizing the light passing through the optical collector (102) with a 45 ° linearly polarized beam with respect to the optical fiber (P) axis; A polarization analyzer (104) installed at an angle of 90 ° with the polarizer (103), the optical fiber (P) being placed in close contact with the polarizer (103) to prevent transmission of a background image of the optical fiber (P); An optical fiber seating jig including a tensile force sensor 107 for tensioning the optical fiber P placed on the polarization analyzer 104 in a longitudinal direction and measuring a tensile force applied to the optical fiber P; An objective lens 108 for enlarging an image of light transmitted through the optical fiber P; And a CD array 109 which measures the transmission change of the optical fiber P according to the tensile force applied to the optical fiber P by the optical fiber mounting jig according to the diameter position of the optical fiber.

In addition, the light source 100 is composed of a helium neon laser or an argon-ion laser, the optical fiber placed on the polarization analyzer is further provided with a microscope slide glass cover 105.

In addition, a refractive index medium similar to glass refractive index is further added to the optical fiber P disposed between the microscope slide glass cover 105 and the polarization analyzer 104, and the refractive index medium is made of a refractive index matching gel or glycerin.

In the conventional measuring device configured as described above, light of a helium neon laser or an argon-ion laser is first emitted from the light source 100. The emitted light is completely scattered and radiated while passing through the light diffuser 101, and the emitted light is collected by the light collector 102 at the position where the optical fiber P is installed. Is polarized by the polarizer 103 to light having linearly polarized light tilted by 45 ° with respect to the optical fiber P axis.

The polarized light is connected between the microscope slide glass cover 105 and the polarization analyzer 104 at one end thereof with the moving stage 106 and at the other end thereof with the optical fiber P connected with the tensile force sensor 107. It is placed in a material having a refractive index similar to that of glass such as gel or glycerin, and passes through the unit side interposed therebetween. In this case, the light that does not penetrate the optical fiber P, that is, the background image, is irrespective of the optical fiber tension. Are not transmitted by the polarization analyzer 104.

The tensile force sensor 107 is a piezo electric tranducer is used, the tensile force is pulled by the piezo electric sensor that is slowly pulled by the moving stage 106, holding the other end of the optical fiber (P) It is measured.

An image of the optical fiber P passing through the unit is captured by the objective lens 108 on the CCD array 109.

That is, the basic principle of the device is to apply a tensile force to the optical fiber (P) to measure the change in the transmission of light according to the position of the diameter of the optical fiber by the CCD array 109, the transmitted light is the optical fiber (P) Different values can be obtained depending on the radial coordinate and the strain. Therefore, by measuring and calculating the light transmission modulation according to the tension for each diameter coordinate, it is possible to find out the residual stress and the photoelastic effect, and the calculation thereof is performed by the computer 110.

However, the measuring device for measuring the residual stress and photoelastic effect of the optical fiber configured as described above has not been put to practical use at present, and thus it is not effectively preventing the light scattering and the light loss caused by the residual stress generated during the optical fiber manufacturing process. There is a situation.

Therefore, the present invention has been devised to solve the above-mentioned conventional problems, and its object is to manufacture a fiber optical process by miniaturizing a device that can measure the residual stress remaining in the optical fiber using a porterastic effect. In order to more effectively block and prevent the light scattering and the resulting light loss due to the residual stress generated in the to make it easy to carry and use.

In order to achieve the object of the present invention, a light source and a first reflecting mirror are disposed on a vertical optical axis, and an optical vertical diffuser, a zoom lens, and an aperture are disposed on a horizontal optical axis converted by the first reflecting mirror. A support is formed above one side of the base plate; The upper horizontal support is integrally formed to protrude toward the upper end of the intermediate vertical support, and the light source penetrates the upper horizontal support and the camera cap with the CCD camera and the polarizer built on the optical axis perpendicular to the front and rear sides of the upper horizontal support. A laser cap is provided to protect the outside of the upper side of the upper side of the upper horizontal support, and a revolve having a plurality of objective lenses while forming the same optical axis as the CCD camera; A base having a second reflection mirror which is symmetrical with the first reflection mirror while forming the same optical axis as the aperture built into the intermediate vertical support, is formed at the center of the front base plate of the intermediate vertical support; In the middle portion of the base, a rotating polarizer, a wave plate, and a condenser lens are embedded on a vertical optical axis converted by the second reflection mirror and forming the same optical axis as the revolve, and a measuring table having a through hole is formed in the center of the upper surface. Become; Residual stress measurement apparatus is provided, characterized in that the rail is formed on the upper surface of the base on both sides of the measuring table to move the optical fiber mounting jig in a linear direction.

In addition, the intermediate vertical support, characterized in that it comprises a polarizer for linear movement to the upper side of the measuring table by the drive device.

1 is a perspective view showing the appearance of the present invention.

2 and 3 show the internal configuration of the present invention,

2 is a front view.

3 is a side view.

Figure 4 is a perspective view schematically showing the configuration of a measuring device for measuring the residual stress and photoelastic effect of the conventional optical fiber.

* Explanation of symbols for the main parts of the drawings

1: base plate

2: middle vertical support

21: light source 22: first reflection mirror

23: Light diffuser 24: Zoom lens

25: Aperture 26: Fixed polarizer

3: upper horizontal support

31: Camera cap 32: CCD camera

33: polarizer 34: laser cap

4: revolve

40: objective lens

5: base

50: second reflecting mirror

6: measuring table

61: rotating polarizer 61A: polarizer driving device

62: wave plate 63: condenser lens

64: Through hole

7: Rail

70: optical fiber seating jig 70A: rail groove

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration of the present invention according to the embodiment.

1 is a perspective view showing the appearance of the present invention, as shown in the present invention is provided with a base plate (1) formed in a plate shape having a predetermined area, the upper surface on one side of the middle portion of the base plate (1) The intermediate vertical support (2) is formed integrally, the upper end of the intermediate vertical support (2) is formed integrally so that the upper horizontal support (3) protrudes forward.

In addition, a cylindrical camera cap 31 and a laser cap 34 are installed on the front and rear sides of the upper horizontal support 3, and the lower portion of the upper horizontal support 3 is coaxially formed on the camera cap 31. On the side, a revolve 4 is provided which has a plurality of objective lenses 40 so that the objective lenses 40 are positioned on the optical axis by rotating.

In addition, the upper surface of the middle portion of the front base plate (1) of the intermediate vertical support (2) is provided with a base 5 in a rectangular box shape, the middle portion of the upper surface of the base (5), that is, the revolve (4) The measuring table 6 protrudes upward from the lower side of the measuring table 6, and a through hole 64 having the same optical axis as the objective lens 40 is formed at the center of the upper surface of the measuring table 6.

At the same time, a pair of rails 7 are provided on the upper surface of the base 5 of one side space in both space portions of the measuring table 6 so that a conventional optical fiber mounting jig 70 can be linearly moved toward the measuring table 6 side. As formed, rail grooves 70A which are in sliding contact along the rails 7 are formed at both sides of the lower end surface of the optical fiber seating jig 70.

On the other hand, the intermediate vertical support (2) has a polarizer 33 which is drawn out in the horizontal movement to the through-hole 64 side of the measuring table 6 by the drive device (not shown) therein, or back into the inside As provided, the polarizer is used at initial setting before use of the device, and when not in use, the polarizer is introduced into the intermediate vertical support 2 by the driving device, and the driving device is constituted by a rack and pinion coupling. However, the technical configuration is not limited thereto and the operation is performed.

2 and 3 show the internal configuration of the present invention, Figure 2 is a front view, Figure 3 is a right side view.

As shown in the present invention, the light source 21 penetrates the upper horizontal support 3, and is installed in the vertical direction in the middle vertical support 2, and the upper side of the light source 21 is blocked with its upper surface. The outside is protected by the laser cap 34 formed of a cylindrical body, and the first reflecting mirror 22 is provided in an inclined shape by 45 ° on the vertical axis of the lower side of the light source 21 so that the first reflecting mirror ( 22) the vertical optical axis can be converted to the horizontal optical axis.

On the converted horizontal optical axis, a light spreader 23 for emitting light of the light source 21, a zoom lens 24 for receiving a large amount of light, and an aperture 25 for adjusting the amount of light are provided. It is mounted in the horizontal direction of the inner lower side of the intermediate vertical support 2 in such a way as to be arranged in sequence.

A second reflecting mirror 50 having a 45 ° inclination angle symmetrically with the first reflecting mirror 22 is provided inside the base 5 having the same optical axis as the aperture 25 of the intermediate vertical support 2. The second optical mirror 50 is configured to convert the horizontal optical axis back to the vertical optical axis, the converted optical axis is a revolve (4) provided on the front lower side of the upper horizontal support (3) It is configured to be coaxial with the objective lens 40 of.

In addition, the rotating polarizer 61, the wave plate 62, and the condenser lens 63 are sequentially arranged on the vertical optical axis in the measuring stand 6 formed above the upper surface of the base 5 on the vertical optical axis. The rotatable polarizer 61 is rotated by the polarizer driver 61A so that the direction of incident light can be set, and is radiated as it is while passing through the wave plate 62. The light passing through is condensed by the condenser lens 63.

In addition, the upper horizontal support 3 of the upper side of the revolve 4 having a plurality of objective lenses 40 and the inside of the camera cap 31, the through-hole 64 formed in the center of the measuring table 6 and the rotating type The polarizer 61, the wave plate 62, the polarizer 33 and the CCD camera 32 which form the same optical axis as the condenser lens 63 are mounted.

In addition, the upper side of the measuring table 6 is pulled out or pulled back into the inside of the intermediate vertical support 2 by a driving device (not shown) to move horizontally to the through hole 64 side of the measuring table 6. The polarizer 33 is provided, which is used at initial setting before use of the device, and when not in use, is introduced into the intermediate vertical support 2 by the driving device, and the driving device is rack. And pinion combination.

In addition, the other side of the upper surface of the base 5 is provided with a conventional optical fiber mounting jig 70, the optical fiber mounting jig 70 is a measuring table 6 by the rail 7 formed on the upper surface of the base 5 Side), and the rail 7 is formed on the upper surface of the base 5 of the one side space portion of the measuring table 6 provided in the middle of one side of the upper surface of the base 5, so that the optical fiber seating jig 70 When moving along the rail 7 toward the measuring table 6, it is not subjected to the interference by the measuring table 6.

Next will be described in detail the optical path measurement process of the present invention configured as described above.

First, when the light of the helium laser is irradiated vertically downward from the light source 21, the light is changed by the first reflecting mirror 22 on the lower side of the light source 21 to the horizontal optical axis, and this conversion is performed. The light is passed through the light spreader 23, the zoom lens 24, and the iris 25 sequentially arranged in the lower inner horizontal direction of the intermediate vertical support 2, and the light passes through the first reflection. The second reflection mirror 50 inside the base 5, which is symmetrical with the mirror 22, enters the measuring table 6 while forming an optical axis vertically upward.

The incident light is emitted when passing through the wave plate 62 embedded in the measuring table 6, and the emitted light is condensed by the upper condensing lens 63 of the wave plate 62 again. The condensed light passes through the optical fiber located on the measuring table 6 through the through hole 64 of the measuring table 6, thereby causing the photoelastic effect due to the residual stress remaining in the optical fiber. Depending on the polarization direction, a difference occurs in the phase of transmitted light.

The light passing through the optical fiber is incident on the objective lens 40 and the CCD camera 32 of the revolve 4 to produce an enlarged image, and the measured image is calculated by a computer.

As described above, the present invention reduces the light scattering caused by the residual stress and the optical loss caused by the optical fiber manufacturing process by miniaturizing a device that can measure the residual stress remaining in the optical fiber by using the porterastic effect. It is effective to ensure the convenience of transportation and use while preventing and preventing more effectively.

Claims (2)

The light source 21 and the first reflecting mirror 22 are disposed on a vertical optical axis, and the light spreader 23 and the zoom lens 24 are arranged on the horizontal optical axis converted by the first reflecting mirror 22. An intermediate vertical support 2 having a built-in diaphragm 25 formed above one side of the base plate 1; The upper horizontal support (3) integrally protrudes toward the upper front of the intermediate vertical support (2), CCD camera 32 and the polarizer (on the optical axis perpendicular to the front and rear sides of the upper horizontal support (3) 33 is provided with a built-in camera cap 31 and a laser cap 34 for protecting the outer side of the upper side of the light source 21 penetrating the upper horizontal support 3, the lower front side of the upper horizontal support 3 A revolve 4 having a plurality of objective lenses 40 forming the same optical axis as the CCD camera 32; A second reflecting mirror symmetrical with the first reflecting mirror 22 while forming the same optical axis as the diaphragm 25 embedded in the intermediate vertical support 2 at the center of the front base plate 1 of the intermediate vertical support 2. A base 5 provided with 50 is formed; The rotating polarizer 61 and the wave plate 62 on the vertical optical axis, which is converted by the second reflection mirror 50 and forms the same optical axis as the revolve 4, in one middle portion of the base 5, A condenser lens 63 is built in, and a measuring table 6 having a through hole 64 is formed in the center of the image surface; Residual stress measuring apparatus of the optical fiber, characterized in that the rail (7) is formed on the upper surface of the base (5) on both sides of the measuring table (6) to move in a straight direction. According to claim 1, wherein the intermediate vertical support (2), Residual stress measuring device of the optical fiber, characterized in that it comprises a polarizer 33 for linear movement to the upper side of the measuring table (6) by the drive device.