JP2007071684A - Device for inspecting optical fiber bundle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for inspecting an optical fiber bundle capable of easily and exactly calculating the number of optical fiber in an optical fiber bundle. <P>SOLUTION: An image memory containing image information at the end surface of the optical fiber bundle showing the transmissivity of each optical fiber in an optical fiber bundle in accordance with concentration and an image processing means for measuring the total number of the optical fiber from the image information from the image memory are provided. The image processing means comprises a concentration range partition means for separating the total range of the concentration into a plurality of sections by varying in turn a threshold corresponding to the concentration, a calculation means for calculating the number of the optical fibers existing in the concentration section between the varied threshold and the threshold before the variation, and a measuring means for obtaining the total number of the optical fiber in each concentration section. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical fiber bundle inspection apparatus. For example, the end face of the optical fiber bundle is imaged with a digital camera or the like, and the image information is taken into a computer and image processing is performed to inspect the characteristics of the optical fiber bundle. The present invention relates to an optical fiber bundle inspection apparatus.

  2. Description of the Related Art In recent years, an optical fiber bundle inspection apparatus having a configuration in which an end face of an optical fiber bundle is imaged with a digital camera, and the image information is taken into a computer for image processing is known.

  This is because each optical fiber is miniaturized and the number thereof is increasing year by year, so that inspection through image processing by the computer can be inspected very efficiently.

For example, the end face of the optical fiber bundle is displayed on the display together with the interference fringes, and it is inspected whether or not the angle of the end face of the optical fiber bundle polished by the interference fringes is within an allowable range. Details of such an optical fiber bundle inspection apparatus are disclosed in, for example, Patent Document 1 below.
JP 2003-194667 A

  However, since the number of optical fibers in an optical fiber bundle is extremely large, it is extremely difficult to accurately measure the number of optical fibers, and there is a strong demand for easy measurement.

  In addition, some of the optical fibers are broken in the middle, and it has been demanded that such optical fibers can be easily recognized in which position in the optical fiber bundle. . This is because the defective optical fiber can be easily removed.

  Furthermore, there is a demand for overall understanding of the distribution of light transmission in each optical fiber constituting the optical fiber bundle. By grasping this, for example, an image obtained via the optical fiber bundle can be corrected according to the distribution.

  And the indication which suggests the solution of these requests is not indicated by the said patent document 1. FIG.

  Therefore, the present invention has been made based on such a situation, and an object thereof is to provide an optical fiber bundle inspection apparatus capable of easily and accurately calculating the number of optical fibers of an optical fiber bundle. It is in.

  Another object of the present invention is to provide an optical fiber bundle inspection apparatus capable of easily and accurately detecting, for example, defective ones among optical fibers of an optical fiber bundle.

  Another object of the present invention is to provide an optical fiber bundle inspection apparatus that can easily and accurately grasp the distribution of the light transmission state of each optical fiber.

   Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.

(1) An optical fiber bundle inspection apparatus according to the present invention includes, for example, an image memory that stores image information of an end face of an optical fiber bundle that indicates the light transmission state of each optical fiber of the optical fiber bundle in correspondence with the concentration,
Image processing means for measuring the total number of optical fibers from the image information from the image memory,
The image processing means includes density range dividing means for dividing the entire density range into a plurality of sections by sequentially changing a threshold value corresponding to the density;
A calculating means for calculating the number of optical fibers in the concentration section between the changed threshold and the threshold before the change;
Measuring means for obtaining the total number of optical fibers in each concentration section.

(2) The optical fiber bundle inspection device according to the present invention has, for example, a display,
An image memory for storing image information of the end face of the optical fiber bundle indicating the light transmission state of each optical fiber of the optical fiber bundle corresponding to the density;
From the image information from the image memory, a graph for displaying an optical fiber bundle display that can identify each optical fiber individually on the end face of the optical fiber bundle and each fiber display corresponding to each optical fiber according to the concentration Image processing means for performing display on the display,
The image processing means includes a fiber display selection means for selecting the fiber display of the graph display on the display, and a display capable of distinguishing the optical fibers in the optical fiber bundle corresponding to the selected fiber display from other optical fibers. And an optical fiber specifying means for performing the above.

(3) The optical fiber bundle inspection apparatus according to the present invention is based on the configuration of (2), for example, and the graph display displays each fiber display in parallel in one direction. It is arranged and displayed at a position corresponding to the density in a direction intersecting with one direction.

(4) The optical fiber bundle inspection apparatus according to the present invention has, for example, a display,
An image memory for storing image information of the end face of the optical fiber bundle showing the light transmission state of each optical fiber of the optical fiber bundle corresponding to the concentration;
Image processing means for performing optical fiber bundle display on the display capable of individually identifying each optical fiber from an end face of the optical fiber bundle from the image information from the image memory;
When the image processing means inputs at least two numerical values corresponding to the density within the density range, the range of the two numerical values of the density of each optical fiber of the image information from the image memory And a display means for displaying the selected optical fiber so that the selected optical fiber can be distinguished from other optical fibers on the optical fiber bundle display.

(5) The optical fiber bundle inspection apparatus according to the present invention is based on the configuration of (4), for example, and at least two numerical values corresponding to the concentration within the concentration range are displayed on the display. It is characterized in that it is performed by the numerical value setting field.

  In addition, this invention is not limited to the above structure, A various change is possible in the range which does not deviate from the technical idea of this invention.

  Embodiments of an optical fiber bundle inspection apparatus according to the present invention will be described below with reference to the drawings.

  FIG. 2 is an overall configuration diagram showing an embodiment of an optical fiber bundle inspection apparatus according to the present invention.

  In FIG. 2, the optical fiber bundle inspection apparatus includes a light source 1, a condensing lens 2 for condensing the light from the light source 1, and an optical fiber bundle 3 for guiding the light from the condensing lens 2 from one end surface side. And an optical system 4 that directly irradiates light from the other end surface side of the optical fiber bundle 3 in that direction and diverges the light in a direction orthogonal to the direction, and the optical fiber bundle attached to the optical system 4 The digital camera 5 to which the light from 3 and the light directly irradiated in that direction is guided, and the light that is attached to the optical system 4 and branched in a direction orthogonal to the light from the optical fiber bundle 3 The observation window 6 is guided, and the computer 7 takes in the image information from the digital camera 5 and processes the image information.

  The optical fiber bundle 3 is an object to be inspected, and at least the other end surface side (the surface opposite to the light source 1 side) is fixed to the support base 8. Light from the end face side is normally incident on the optical system 4.

  The support base 8 is configured to be placed on a desk (not shown), for example, and the optical system 4 (or the camera 5 is acceptable) via an arm 8A fixed to the support base 8. Also comes to support. Thereby, the light from the other end surface side of the optical fiber bundle 3 is irradiated in the vertical direction with respect to the desk, for example, and the optical system 4 and the digital camera 5 are sequentially arranged in the direction. .

  The optical system 4 includes, for example, a half mirror 4A disposed with an inclination of 45 ° with respect to the direction of light irradiation from the optical fiber bundle 3, and the optical fiber bundle transmitted through the half mirror 4A. The light from 3 is guided to the digital camera 5 side, and the light from the optical fiber bundle 3 reflected from the half mirror 4A is guided to the observation window 6 side. The configuration of the optical system 4 is not limited to the above-described one, and, of course, for example, a prism or the like may be used instead of the half mirror 4A.

  The computer 7 includes a display 7A and can be operated using a keyboard 7B, a mouse 7C, and the like.

  In the optical fiber bundle inspection apparatus configured as described above, the light from the light source 1 is incident on the one end face side of the optical fiber bundle 3 through the condenser lens 2, and the light is bundled. Each of the three optical fibers 3a is transmitted through the other end face side of the optical fiber bundle 3.

  Light from the other end face side of the optical fiber bundle 3 enters the optical system 4 and is reflected by the half mirror 4A to be guided to the observation window 6. The inspection engineer observes the other end surface of the optical fiber bundle 3 through the observation window 6 and can determine that the other end surface of the optical fiber bundle 3 is suitable for photographing by the digital camera 5. ing.

  Image information of the other end face of the optical fiber bundle 3 imaged by the digital camera 5 is stored in an image memory (indicated by reference numeral 71 in the following description) provided in the computer 7, and the image information stored in the image memory is stored in the image information stored in the image memory. On the basis of this, the display described below is made on the display 7A of the computer 7 by operating the keyboard 7B or the mouse 7C.

  3 and 4 are explanatory views showing an embodiment of the display mode on the display 7A of the computer 7. FIG.

  First, in FIG. 3, a button B1 for displaying the number of optical fibers and a button B2 for displaying a density graph of each optical fiber are displayed on a part of the surface of the display 7A. The operator uses the mouse 7C to display the button B1. The image plane when the pointer PT is positioned above and the button B1 is selected is shown.

  The optical fiber bundle 3 is displayed on the image plane so that each optical fiber 3a can be individually identified. The optical fiber bundle 3 is an image displayed based on image information stored in the image memory, and each optical fiber 3a is displayed with a density distribution. This is because the light transmission from each of the optical fibers 3a is displayed as a density difference. In FIG. 3, the optical fiber 3a having the largest amount of light transmission has a pure white cross section, and has a white color that decreases as the light transmission amount decreases and increases in blackness. The smallest optical fiber 3a is shown in black.

  Then, a fiber number display B3 is made adjacent to the display of the optical fiber bundle 3, and in the case of FIG. 3, the number of fibers is displayed as 887, for example. The number 887 of the fiber number display B3 is different from the number of the optical fibers 3a of the optical fiber bundle 3 shown in a simplified manner in FIG. 3, but actually indicates the number of the optical fibers 3a. . Further, the number of fibers in the fiber number display B3 is displayed based on the result of arithmetic processing described later in the computer 7.

  FIG. 4 shows an image plane when the operator selects the button B2 for displaying the optical fiber density graph using the mouse 7C in FIG. In FIG. 4, the optical fiber bundle 3 is displayed on the image plane together with the optical fiber density graph display B4 so that the position of each optical fiber 3a can be identified. At this stage, the display of the optical fiber bundle 3 is different from the display of the optical fiber bundle 3 shown in FIG. 3, and each optical fiber 3a has only a clear position only with respect to the optical fiber bundle 3. The display is not made.

  In the optical fiber concentration graph display B4, the fiber display 10 indicating each optical fiber 3a corresponding to the fiber number is displayed in parallel on the horizontal axis, and each of the fiber displays 10 indicates the corresponding light. It is arranged and displayed at a position on the vertical axis according to the concentration of the fiber 3a.

  Therefore, by observing the concentration graph display B4, the concentration distribution in each optical fiber 3a can be grasped clearly. In this case, in each fiber display 10 of the density graph display B4, there may be a fiber display 10x in which the density is displayed extremely small with respect to many other fiber displays 10. The optical fiber 3a associated with the fiber display 10x means that the light from the light source 1 is not transmitted to the optical system 4 and may be disconnected.

  The operator uses the mouse 7C to position the pointer PT in the image plane on the fiber display 10x, and selects the fiber display 10x, so that one of the optical fibers 3a constituting the optical fiber bundle 3 is selected. For example, the optical fiber 3x is displayed with a color (for example, red). The colored optical fiber 3x is the fiber display 10x in the density graph display B4, and the position of the disconnected optical fiber 3x can be easily recognized by specifying the fiber display 10x.

  In FIG. 4, the optical fiber 3x corresponding to the selected fiber display 10x is colored so as to be distinguished from other optical fibers 3a. However, it goes without saying that it may be distinguished from other optical fibers 3a by other methods.

  Next, before explaining the configuration of the computing process of the computer 7 in the detection of the total number of optical fibers 3a in the optical fiber bundle 3 as shown in FIG. 3, first, the procedure of the computing process will be described with reference to FIG. Explain conceptually. This is to facilitate understanding.

  That is, FIG. 5A shows image information stored in the image memory of the computer 7 and corresponds to the image on the other end face of the optical fiber bundle 3. 3 also corresponds to the image of the optical fiber bundle 3 displayed on the display 7A of FIG. 3, and this image shows the light irradiation state from each of a large number of optical fibers 3a constituting the optical fiber bundle 3. Expressed by density difference. .

  For example, in the case of the optical fiber bundle 3 shown in FIG. 5A, this density difference has a distribution in which the amount of transmitted light (density) decreases in the direction A in the figure. FIG. 6 shows a graph in which the optical fiber bundle 3 actually used and the light transmission amount (average density) in the radial direction of the optical fiber bundle 3 are detected. From one end side to the other end side in the radial direction. It can be confirmed that the average density DD changes almost linearly. This is because, for example, in the configuration of the optical fiber bundle inspection apparatus of FIG. 2, the optical axis of the light source 1 and the light of the optical fiber bundle 3 are difficult due to the difficulty in accurately installing the optical fiber bundle 3 to be inspected on the apparatus. This is caused by the occurrence of misalignment or misalignment between the optical axis of the optical fiber bundle 3 and the optical axis of the optical system 4.

  For this reason, in the present invention, as shown in FIG. 7, which is a diagram in which only the graph is extracted from FIG. 6, the concentration range indicated by each optical fiber 3a is divided into a plurality of ranges (t1, t2,... , T7), and for each concentration range (t1 to t2, t2 to t3,..., T6 to t7) obtained thereby, the optical fiber 3a exhibiting a concentration within the concentration range is extracted and extracted. The total number of optical fibers 3a included in the optical fiber bundle 3 is calculated by measuring the total number of optical fibers 3a and totaling the total number of optical fibers 3a in each section.

5B divides the concentration range into, for example, six with respect to the concentration distribution of the optical fiber bundle 3 shown in FIG. 5A, and (I) to (VI) according to the number. Each operation consisting of a stroke is made. In the process (I), the optical fiber 3a ₁ having the largest amount of light transmission is extracted, and a total of three extracted optical fibers 3a ₁ are measured. Next, in the process (II), the optical fiber 3a ₂ having the next largest amount of light transmission is extracted, and the total number of the extracted optical fibers 3a ₂ is measured. Then, a total of 3 in the previous process is added to the total of 6 to obtain 9 total values. Next, in the process (III), the optical fiber 3a ₃ having the next largest amount of light transmission is extracted, and the total number of the extracted optical fibers 3a ₃ is measured. Then, 9 total values of the previous process are added to the total of 8 to obtain 17 total values. Next, in the step of (IV), the amount of light transmission degree to next most optical fiber 3a ₄ are extracted, four total number of the optical fiber 3a ₄ which is the extraction is measured. Then, 17 total values of the previous process are added to the total of 4 to obtain 21 total values. Further, in the step (V), the optical fibers 3a ₅ having the next largest amount of light transmission are extracted, and a total of seven optical fibers 3a ₅ extracted are measured. Then, 21 total values of the previous process are added to the total of 7 to obtain 28 total values. In the step (VI), the optical fibers 3a ₆ with the least amount of light transmission are extracted, and a total of three extracted optical fibers 3a ₆ are measured. Then, 28 total values of the previous process are added to the total of 3 to obtain 31 total values. These 31 pieces are the number of optical fibers 3a constituting the optical fiber bundle 3 shown in a simplified manner, and correspond to 887 pieces of the fiber number display B3 displayed on the display 7A of FIG.

  In the description of FIG. 5, the optical fiber bundle 3 is intended for the optical fiber 3 a having a concentration that decreases in the direction of arrow A in FIG. 5A in the concentration distribution of the optical fiber 3 a. However, the present invention is not limited to this, and it goes without saying that any concentration distribution can be applied in the same manner and the total number of optical fibers 3a can be calculated.

  The detection of the number of fibers performed in this way is performed by the computer 7 through the processing procedure shown in FIG. Hereinafter, the operation of the computer 7 will be described in the order of steps with reference to FIG.

  Step 1 (S1): First, a threshold value is input, for example, via the keyboard 7B shown in FIG. This threshold value corresponds to the density of the image, and is initially set to a relatively large value, for example. The set threshold value becomes an initial value in the following operation.

Step 2 (S2): The image information (corresponding to the image information shown in FIG. 5A) stored in the memory of the computer 7 is read for each pixel, and the threshold value is exceeded by a known image processing technique. The optical fiber 3a having a shadow (density) is extracted, and the center of gravity of each extracted fiber is calculated. Operation here is equivalent to one of the stroke (I) shown in FIG. 5 (b), are extracted the optical fibers 3a _1, and these centroid coordinates of each light Faiba 3a ₁ is calculated The

Step 3 (S3): The number of optical fibers 3a ₁ extracted in Step 2 is calculated.

Step 4 (S4): A value outside the threshold range (a value corresponding to the density) is stored in each shaded region of the optical fiber 3a ₁ extracted in Step 2. This is for avoiding the addition of the optical fiber 3a ₁ again when the same operation is repeated by subtracting the threshold value as will be described later.

  Step 5 (S5): A constant value is subtracted from the threshold value (initial value) to set a new threshold value. This constant value is a value corresponding to the concentration range of each section obtained by dividing the concentration range indicated by each optical fiber 3a in FIG. 7, and can be arbitrarily set.

  Step 6 (S6): It is determined whether or not extraction of all the optical fibers 3a has been completed.

  When the extraction of the optical fiber 3a is not completed, the operation through the step 2 (S2) and the step 3 (S3) is performed again based on the newly set threshold value. Here, Step 2 (S2) and Step 3 (S3) correspond to (II) in the process shown in FIG. 5B.

Here, the number of the optical fibers 3a ₂ is counted, and this number is added to the number of the optical fibers 3a ₁ .

  Such an operation is performed until all the optical fibers 3a are extracted, that is, until the process (VI) shown in FIG. 5B is reached, and the total value of the optical fibers 3a is calculated. Whether or not the extraction of the optical fiber is completed can be easily determined by detecting that the value obtained in step 4 (S4) is not changed with respect to the value obtained in the previous time.

  The threshold value input in step 1 (S1) is set to a relatively large value. However, it goes without saying that a relatively small value may be set. This is because there is only a difference between counting the optical fiber 3a from the higher density side or counting from the lower density side. The change in the threshold value is constant, but it goes without saying that it can be varied according to the degree of change in the density, for example. Furthermore, in this embodiment, first, the operator sets a threshold value and inputs the value. However, the present invention is not limited to this, and it goes without saying that it may be used as a value input in advance to the apparatus. This is because, for example, if this threshold value is set to a relatively large value, the above-described operation is performed, and it can be determined in advance as an approximate value.

  FIG. 8 is an explanatory view showing another embodiment of the display mode on the display 7A of the computer 7. In FIG.

  In FIG. 8, the optical fiber bundle 3 is displayed on the surface of the display 7A so that each optical fiber 3a can be recognized individually. Each of these optical fibers 3a is shown with a luminance corresponding to the density, and the difference in density is shown as, for example, three types of display in this case. That is, as shown in the legend display B6 in the display 7A, the display is classified as the lightest density, for example, white display Iw, the medium density, for example, gray display Ig, and the darkest density, for example, black display Ib, and In the case of white display Iw, the density is set to P2% or more, in the case of gray display Ig, the density is set within the range of P1% to P2%, and in the case of black display Ib, the density is set to P1% or less. It should be noted that the display indicating the difference in density is not limited to white, gray, and black as described above, and it is needless to say that the colors may be classified using other colors. The point is that they only need to be distinguished.

  The actual value of P2 can be arbitrarily changed by operating the mouse 7C and inputting the value from the keyboard 7B in the numerical value setting field NC2 and the actual value of P1 in the numerical value setting field NC1, respectively. ing.

  The measured concentration of each optical fiber 3a in the optical fiber bundle 3 is actually predetermined within a wide range (range). However, as shown in FIG. 10, the concentration range is changed from the higher concentration side. The division is made into three sections Sh, Sm, and Sl, and the ratio of the number of optical fibers 3a belonging to these sections Sh, Sm, and Sl is to be clarified at a glance. Normally, as the number of optical fibers 3a belonging to the middle concentration range Sm increases, the reliability of the optical fiber bundle 3 as a product increases. Therefore, the values of P2 and P1 in FIG. By setting, that is, by setting the upper limit value and the lower limit value of the concentration range Sm to appropriate values, the optical fiber bundle 3 having the optimum concentration distribution can be selected (for example, selection of an acceptable product). become able to.

  Further, the display on the display 7A shown in FIG. 8 and the display that changes in accordance with the operation of the mouse 7C are performed by the operation in the computer 7 shown in FIG.

  In FIG. 10, there is an image memory 71 in which image information sent from the digital camera 5 is stored. In a normal state, the image information in the image memory 71 is displayed on the display 7A via the synthesizer 75. The image information from the image memory 71 is sent to the optical fiber coordinates (center of gravity) and density detecting means 73.

  On the other hand, there is a mouse 7C, and the concentration classification is performed by the concentration classification setting means 81 in accordance with the operation of the mouse 7C. This means that specific numerical values of P2 and P1 described in FIG. 8 are set.

  Then, the concentration initially set for each optical fiber 3a of the optical fiber bundle 3 by the concentration setting means 82 corresponding to the classification is selected from among the classifications set by the concentration classification setting means 81. Whether it belongs to is determined. That is, it is determined whether the concentration of each optical fiber 3a belongs to any of the concentration ranges Sh, Sm, and Sl shown in FIG.

  Then, the density change means 83 changes the display of the density in each optical fiber 3 a to the density shown in the legend display B 6 shown in FIG. 9, and the density change display thus obtained is displayed via the synthesizer 75. Is displayed on the display 7A.

  In the above-described embodiment, the image information obtained by the digital camera 5 is subjected to image processing using the computer 7, but an arithmetic device and a display unit that replace the computer 7 are used as the optical fiber bundle inspection device. Of course, it may be configured as a dedicated device used exclusively for the above-mentioned, and may have the same function as described above.

  Needless to say, an individual image sensor may be used in place of the digital camera 5 and image information obtained from the individual image sensor may be processed by the computer 7 or an arithmetic unit.

  Each of the embodiments described above may be used alone or in combination. This is because the effects of the respective embodiments can be achieved independently or synergistically.

It is a flowchart which shows one Example of operation | movement of the computer with which the optical fiber bundle inspection apparatus by this invention is equipped. It is a whole lineblock diagram showing one example of an optical fiber bundle inspection device by the present invention. It is explanatory drawing which shows one Example of the display mode in the display of the optical fiber bundle inspection apparatus by this invention. It is explanatory drawing which shows the other Example of the display mode in the display of the optical fiber bundle inspection apparatus by this invention. It is explanatory drawing which showed notionally the operation | movement shown in FIG. 1 using the figure. It is explanatory drawing which showed the light irradiation condition of each optical fiber in an optical fiber bundle as density distribution. It is the figure which showed repeating the measurement of the number of optical fibers in an optical fiber bundle within the divided | segmented density | concentration range sequentially. It is explanatory drawing which shows the other Example of the display mode in the display of the optical fiber bundle inspection apparatus by this invention. It is explanatory drawing which shows performing the classification | category of a density | concentration display in the display mode shown in FIG. It is a block diagram which shows the other Example of operation | movement of the computer with which the optical fiber bundle inspection apparatus by this invention is equipped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Light source, 3 ... Optical fiber bundle, 3a ... Optical fiber, 4 ... Optical system, 4A ... Half mirror, 5 ... Digital camera, 7 ... Computer, 7A ... Display, 7B ... Keyboard 7C: Mouse, B1: Number display button, B2: Concentration graph display button, B3: Fiber number display, PT: Pointer, B4: Concentration graph display, 10x: Fiber display, B6: Legend display, Iw: White display, Ig: Gray display, Ib: Black display, NC1, NC2: Numerical value setting column.

Claims (5)

An image memory for storing image information of the end face of the optical fiber bundle showing the light transmission state of each optical fiber of the optical fiber bundle corresponding to the concentration;
Image processing means for measuring the total number of optical fibers from the image information from the image memory,
The image processing means includes density range dividing means for dividing the entire density range into a plurality of sections by sequentially changing a threshold value corresponding to the density;
A calculating means for calculating the number of optical fibers in the concentration section between the changed threshold and the threshold before the change;
And an optical fiber bundle inspection apparatus, comprising: a measuring unit that obtains the total number of optical fibers in each concentration category. Have a display,
An image memory for storing image information of the end face of the optical fiber bundle indicating the light transmission state of each optical fiber of the optical fiber bundle corresponding to the density;
From the image information from the image memory, a graph for displaying an optical fiber bundle display that can identify each optical fiber individually on the end face of the optical fiber bundle and each fiber display corresponding to each optical fiber according to the concentration Image processing means for performing display on the display,
The image processing means includes a fiber display selection means for selecting the fiber display of the graph display on the display, and a display capable of distinguishing the optical fibers in the optical fiber bundle corresponding to the selected fiber display from other optical fibers. An optical fiber bundle inspection device comprising: an optical fiber specifying means for performing   The graph display shows that each fiber display is arranged side by side in one direction, and each fiber display is arranged and displayed at a position corresponding to the concentration in a direction crossing the one direction. The optical fiber bundle inspection apparatus according to claim 2, wherein Have a display,
An image memory for storing image information of the end face of the optical fiber bundle showing the light transmission state of each optical fiber of the optical fiber bundle corresponding to the concentration;
Image processing means for performing optical fiber bundle display on the display capable of individually identifying each optical fiber from an end face of the optical fiber bundle from the image information from the image memory;
When the image processing means inputs at least two numerical values corresponding to the density within the density range, the range of the two numerical values of the density of each optical fiber of the image information from the image memory An optical fiber bundle inspection apparatus comprising: display means for selecting one of the optical fibers and displaying each selected optical fiber so as to be distinguishable from other optical fibers on the optical fiber bundle display. 5. The optical fiber bundle inspection device according to claim 4, wherein at least two numerical values corresponding to the concentration within the concentration range are input by a numerical value setting column displayed on the display. .

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