JP2003294847A - Method and apparatus for detecting track in radiation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To rapidly image a solid for detecting a track in the detection of the solid trace for automatically judging the radiation dose by a microscope. <P>SOLUTION: A specific measuring region 11 can be rapidly imaged by a line sensor 4 and a traveling means 2 in the horizontal direction of the solid 1 for detecting a track. The traveling means 2 horizontally moves the solid 1 for detecting the track in X/Y directions by a linear motor according to computer control. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation track detection method and apparatus for determining the amount of incident neutrons and the like in hospitals, laboratories, etc. that handle radioactive materials.

[0002]

2. Description of the Related Art In recent years, the number of facilities that generate radiation, such as radiation treatment in hospitals and nuclear power plants, has increased, and the need for measuring the individual radiation dose of persons engaged in such places has increased. By the way, heretofore, the measurement of the amount of personal exposure has been performed by JP-A-11-174157 and 2001-42038.
As disclosed in the publication, there is proposed a means of wearing a track detecting solid on a jacket or the like and measuring the incident amount and the incident direction of the radiation recorded on the track detecting solid. This measuring means is generally as follows.

The solid for detecting a track of radiation is made of an organic plastic or the like, and when radiation passes through the solid for detecting a track, a polymer bond is damaged. Then, when the damaged portion is etched with a predetermined solution, minute etch pits are generated. The shape of this etch pit differs depending on the amount of radiation and the direction of incidence. Therefore, the incident amount and the incident direction of the radiation can be determined by inspecting and tabulating the shape of the etch pit generated in the solid for track detection with a microscope.

By the way, it is possible to visually inspect and count the shape of the etch pits while looking at the microscope, but it is very time-consuming to visually inspect the shape of the etch pits in the solid for track detection. Labor is required. Furthermore, the results may vary depending on the individual difference of the person who measures. For this reason, a so-called two-dimensional CCD camera having an image pickup device provided in a plane is attached to a microscope, and an image picked up by this charge-coupled device (CCD) sensor is analyzed by an image processing device to determine the amount of radiation incident. A means for automatically determining the incident direction can be considered.

[0005]

However, the conventional CCD
A CCD sensor used in a camera has, for example, 21 sides.
600 micrometer charge-coupled devices vertically and horizontally,
That is, a two-dimensionally arranged about 350,000 pieces are used. Therefore, for example, when imaging at a magnification of 30 times, 21 μm × 60
Only 0/30 = 0.42 mm square area can be imaged at one time.

For this reason, while moving the solid for detecting a track in the imaging range of 0.42 mm square in order from the end,
It is necessary to repeat imaging. By the way, in order to obtain a clear imaged screen, it is necessary to stop the track detection solid every time the image is moved one by one, and it takes a lot of time to image a predetermined imaged area. It is therefore an object of the present invention to provide a solid-state radiation track detection method and apparatus capable of rapidly imaging a solid for radiation track detection.

[0007]

[Means for Solving the Problems] In order to solve the above problems,
The first feature of the radiation track detecting method according to the present invention is that a moving step of moving the radiation track detecting solid, an enlarging step of enlarging the track detecting solid with a microscope, and a step of enlarging the enlarging track detecting solid. An imaging step of capturing a line image with a line sensor, a creation step of creating an image of the track detection solid from the line image, and a determination step of determining at least one of an incident amount or an incident direction of radiation from the image And to prepare.

Here, the line sensor means a sensor composed of one charge-coupled device linearly arranged in a line, for example, thousands, but it is not always limited to one.
A linear array of a plurality of 2 to 10 charge-coupled devices is also included. Further, the determining step of determining the incident amount or the incident direction of the radiation from the image is a step by a known image processing means, which scans the etch pits included in the image and recognizes the shape of the etch pits. Then, it means a computer processing step of comparing and collating with the previously recorded shape pattern of the etch pits to determine the shape and direction of the etch pits and totaling the entire image.

A second method of detecting a radiation track according to the present invention
The moving step described in the first characteristic is a step of horizontally moving a support base that supports the track detecting solid by a motor, and the imaging step is performed when the enlarged track detecting solid is used. Every time the width of the line sensor is moved,
It consists of the step of imaging with the line sensor.
Here, the motor includes a linear motor capable of high-speed driving, high response, and high-accuracy positioning, as well as a step motor capable of high-accuracy positioning.

The radiation track detecting apparatus according to the present invention is characterized by a moving means for moving a radiation track detecting solid.
Enlarging means for enlarging the track detection solid with a microscope, a line sensor for capturing the expanded track detection solid as a line image, and a creation means for creating an image of the track detection solid from the line image, The determination means for determining at least one of the incident amount and the incident direction of radiation from this image is provided.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A radiation track detecting apparatus according to the present invention will be described with reference to FIGS. The radiation track detecting device comprises a moving means 2 for moving the track detecting solid 1.
And a microscope 3 for enlarging the track detection solid, a line sensor 4 for capturing the expanded track detection solid as a line image, and an image of the track detection solid is created from the line image. The determination means 5 is provided for determining the incident amount and the incident direction of the radiation from the image. In addition, a tilting table 6 which is a support table is installed above the moving means 2 to support the track detection solid 1 and to adjust its inclination and focal length. The moving means 2 and the microscope 3 are respectively supported by the L-shaped mount 7.

The moving means 2 is installed on the horizontal portion of the L-shaped mount 7, and the tilting table 6 on which the track detection solid 1 is placed is horizontally moved by the linear motor in the left-right and front-back directions. . This linear motor is a well-known technique, in which an armature moves on a permanent magnet arranged in a strip shape, and high speed drive, high responsiveness, and high precision positioning are possible. And this linear motor
As will be described later, it is remotely controlled by a computer to move the track detection solid 1 to a predetermined position. An encoder is also provided near the linear motor, and the movement amount of the tilting table 6 by the linear motor is fed back to the arithmetic processing unit 51.

Next, the microscope 3 is composed of an optical microscope, and includes an objective lens 31, a lamp unit 32 for irradiating solids for track detection, an AF unit 33 for autofocusing, a lens barrel 34, and an eyepiece for visual observation. It is composed of a lens 35. These will be described in order below.

The objective lens 31 used has a magnification of 10 times and a magnification of 20 times, and can be manually switched by a revolver 36. In order to obtain a clear image, the lamp section 32 bends light from a halogen lamp (not shown) provided inside the lamp section 32 by a half mirror at a right angle along the optical axis of the microscope 3 and traces it. The solid for detection 1 is irradiated and the reflected light from the solid for track detection 1 is enhanced. Further, an optical fiber 8 for introducing light from a halogen lamp (not shown) provided outside the frame 7 is provided so that the back surface of the solid 1 for detecting a track can be irradiated. The AF unit 33 for out-of-focus includes a focusing unit 331 having a laser projecting unit and a two-dimensional CCD sensor 332.

As shown in FIG. 3, the laser light projecting means includes a front light projecting means composed of a laser light projecting portion 331b and a light receiving portion 331a, a laser light projecting portion 331d and a light receiving portion 33.
1c and a rear light projecting unit, each of which is arranged on the printed circuit board 333. Printed circuit board 33
3 is attached to the inner wall surface of the AF unit 33. The laser light emitted by the light projecting units 331b and 331d is bent at a right angle along the optical axis of the microscope 3 by the lens system and the half mirror and projected onto the solid for track detection 1, and the reflected light travels along the path. In reverse, the light receiving unit 331
a, 331c.

As shown in FIG. 4, the light projection position on the track detecting solid 1 is the upper surface of the track detecting solid 1 in the field of view A of the microscope 3 and the range B imaged by the line sensor 4. The positions are set to the neighboring positions C1 and C2 on both sides of. Here, the proximity position C1 is the projection position of the laser light from the light projecting unit 331b, and the proximity position C2 is the projection position of the laser light from the light projection unit 331d. Therefore, it is possible to reliably prevent the laser reflected light from the track detection solid 1 from entering the line screen imaged by the line sensor 4, and measure the focal length to the imaging range B in the vicinity thereof as much as possible. It becomes possible to measure accurately. As will be described later, the focusing means 331 including the two sets of laser light projecting means can quickly adjust the inclination and the focal length of the track detection solid 1. Also, 2
As will be described later, the set of laser projecting means is provided so that when the line sensor 4 sequentially captures line images while moving the track detection solid 1 in the X direction, the track detection solid 1 is moved in the left direction and the right direction. This is for the purpose of properly using the movement such that the near position C1 and the like where the laser light is projected is located in front of the range B where the line image is captured. As a result, even if the line sensor is alternately bidirectionally scanned in the left and right directions, the focal length can be adjusted on the front side of the range captured by the line sensor, and focus adjustment can be accurately performed.

The two-dimensional CCD sensor 332 is a general C
A charge-coupled device with a side length of 21 μm, which is used in a CD camera, has a length and width of 600 × 600 =
About 350,000 pieces are arranged in a plane and are mounted on the printed circuit board 333 shown in FIG. Two-dimensional CCD
The sensor 332, as shown in FIG.
The rectangular area on the surface of the two sides of the imaging range C of the line image is the imaging range E of the two-dimensional CCD sensor 332, and an image is taken through the half mirror. The area D in FIG. 3 is
This is the imaging surface D of the two-dimensional CCD sensor 332. And
As will be described later, the imaging area 11 of the track detection solid 1 can be designated by the imaging of the two-dimensional CCD sensor 332.

The lens barrel 34 is an eyepiece lens 35 for visual observation.
And the line sensor 4 are supported, and the side portion of the lens barrel is attached to the upright portion of the L-shaped mount 7 via the rack and pinion mechanism 71. Therefore, when the track detection solid 1 is mounted on the tilting table 6, the microscope 3 itself can be manually moved up and down by the rack and pinion mechanism 71. In addition,
In the eyepiece 35 for visual observation, the optical axis from the objective lens 31 is tilted with a prism so that visual observation becomes easy.

The line sensor 4 is housed in a case, and the case is detachably attached to the tip of the lens barrel 34. The shape of this mounting portion is an F mount, which is the standard mounting shape for a single-lens reflex camera for the lens mounting portion. Line sensor 4 is 1
Each of the charge-coupled devices having a side of 7 micrometers is arranged in a line, and about 4000 pieces are linearly arranged. Therefore, when the imaging magnification is 10 times, the width is 7 micrometers ÷ 10 = 0.7 micrometers, and the length is 7 micrometers × 4000 pieces ÷ 10.
= 2.8 mm range can be imaged at one time. Then, as will be described later, the line sensor 4
Is a track detection solid 1 which is horizontally moved by a moving means 2.
Are sequentially imaged for each range, and the respective line image data are transmitted to the determination means 5 described below via a connection code (not shown).

The judging means 5 uses a commercially available computer, that is, a so-called personal computer, and has an arithmetic processing section 5.
1, a display unit 52, and a memory unit 53 for recording line image data. As will be described later, the arithmetic processing unit 51 is fed back from the encoder of the moving means 2, the setting of the imaging area of the solid 1 for detecting a track, the movement of the moving means 2, the adjustment of the tilt and the focal length of the tilting table 6. An instruction to execute image capturing of the line sensor 4 based on the moving amount, capture of line image data captured by the line sensor 4, creation of an entire image of an imaging region from the line image data, and incidence of radiation from the entire image. The quantity and the incident direction are determined.

Next, the tilting table 6 will be described. The tilting table 6 includes three ultrasonic motors 61 arranged so as to form an equilateral triangle, and a flat plate-shaped table portion 62 supported at three points by the tip of a vertical output shaft 61a of the ultrasonic motor. It is composed of a fixing member 63 for fixing the mutual positions of the ultrasonic motor 61.
In the present embodiment, the three ultrasonic motors 61 serve as adjusting means for adjusting the tilt and the vertical position of the tilting table 6 which is the support base. The vertical output shaft 6
The tip of 1a is in contact with a recess formed on the back surface of the table portion 62 so that their horizontal positions do not shift.

The ultrasonic motor 61 is a known technique,
An elastic member is placed on a piezoelectric ceramic that deforms when a voltage is applied, and a voltage in the ultrasonic range is applied to this piezoelectric ceramic to generate bending vibration in the elastic member, which rotates the output shaft. It has responsiveness and controllability, and has characteristics such as low operating noise. The output shaft of the ultrasonic motor 61 used in the present invention has a screw structure, and the output shaft rotates to move vertically. As will be described later, the tilting table 6 is controlled by the computer control based on the signal from the focusing means 331 described above.
By driving each of the ultrasonic motors 61, the inclination of the track detection solid 1 and the focal length are adjusted. That is, the three ultrasonic motors 61 function as adjusting members for tilting or vertically moving the tilting table 6 which is a support base.

Next, the use of the radiation track detecting device according to the present invention will be described with reference to FIGS. As shown in FIG. 6, first, the track detection solid 1 which is a radiation measurement target is set on the upper surface of the table portion 62 of the tilting table 6 (A), and the track detection is performed by vacuum means or the like so as not to move. The solid for use is fixed to the table by adsorption or the like (B). Next, track detection solid 1
The measurement area 11 is set by input from the personal computer (C).

As shown in FIG. 7, the measurement area 11 is a rectangular area on the surface of the track detection solid 1 for actually capturing an image of the etch pit. The reason for designating the measurement area 11 is that, when the size of the track detection solid 1 is different, it is necessary to take an image within a range that does not protrude from the periphery of the track detection solid, and the line sensor 4 sequentially. Start point 11a and end point 11b of the line image to be captured
This is for setting and. The measurement region 11 can be set while looking at the eyepiece 35 for visual observation,
The workability can be much improved by displaying and setting the image of the track detection solid 1 on the display unit 52 of the personal computer.

By the way, in the present invention, since the image pick-up from the line sensor 4 is sent to the judging means 5 as described later, this image pick-up is displayed on the display section 52, and the measurement area 11 is displayed while looking at the image pick-up screen. It is also possible to set it.
However, since each line image captured by the line sensor 4 has an extremely narrow range of 0.7 μm as described above, it is difficult to confirm the peripheral portion of the track detection solid 1. Therefore, while looking at the line image, make sure that it does not stick out from the periphery of the solid 1 for track detection,
It is virtually impossible to set the measurement area 11. Therefore, in the present invention, the measurement area 11 is set by the two-dimensional CCD sensor 332 that can image the two-dimensional spread to some extent.

The setting of the measurement area 11 is performed by XY by moving the moving means 2 by an instruction from the input means 53 of the personal computer while looking at the image pickup screen showing the image pickup area E (see FIG. 5) of the two-dimensional CCD sensor 332. Adjust the movement in the direction. That is, the two-dimensional CCD sensor 332 projects the area around the position 11a in the vicinity of one corner on the diagonal of the rectangular solid 1 for track detection shown in FIG. Then, the periphery of the position 11b near the corner of the other end on the diagonal line is projected, the end point of the imaging is set, and the position is recognized by the personal computer. This allows
The XY coordinates of the positions 11a and 11b are recorded in the arithmetic processing unit 51 of the personal computer as information corresponding to the movement start point and end point positions of the linear motor of the moving means 2. Therefore, as will be described later, when an image is captured by the line sensor 4, the linear motor of the moving unit 2 is moved to the inner position 11a which is the first image capturing position according to an instruction from the arithmetic processing unit 51.
To the horizontal position 11b, which is the last imaging position, sequentially.

After the setting (C) of the measurement area 11 is completed, the focal length and the inclination of the track detecting solid 1 are adjusted (D). This adjustment is automatically performed according to the instruction from the arithmetic processing unit 51 of the personal computer based on the information from the focusing means 331 equipped with the laser projecting means equipped in the AF unit 33 according to the procedure shown in FIG. here,
The reason why the inclination of the track detection solid 1 and the focal length are adjusted by the focusing means 331 including a light projecting means will be described. That is, as described above, the present invention is the two-dimensional CCD sensor 33 mounted on the line sensor 4 and the AF unit 33.
Have two. Therefore, it is conceivable that the focal length is automatically set by these sensors like a normal CCD camera.

However, this means has the following problems.
For the automatic setting of the focal length of a normal CCD camera using the two-dimensional CCD sensor 332, the captured image is the sharpest,
That is, the focus position with high contrast is set as the focused position. Therefore, the two-dimensional CC
When trying to adjust the focus with the D sensor 332, it is necessary to check the maximum contrast value by searching before and after the in-focus position in order to find a position where the contrast is strongest. However, since the line sensor 4 images a very narrow range, it is difficult to detect the contrast of the image, and it is necessary to check before and after the in-focus position. is there. Therefore, in the present invention, the focusing means 331 by laser projection, which can measure the focal length with extremely high accuracy and high speed, is adopted.

Now, returning to FIG. 8, the procedure for adjusting the inclination of the track detection solid 1 will be described. This adjustment is controlled by a program built in the arithmetic processing unit 51 of the personal computer. First, the arithmetic processing unit 51 sets (G) the central portion of the measurement region 11 of the solid 1 for track detection as the measurement point i = 1 so that the optical axis of the microscope 3 coincides with this XY coordinate position. , The moving means 2 is moved (H). Then, at this position, a laser spot is projected from the light emitting portions 331b and 331d, and it is determined whether or not the distance to the track detection solid 1 deviates from an appropriate focal length (I).

The deviation from the proper focal length is detected by the light receiving means 33.
Judgment is made based on the shape of the reflected light incident on 1a and 331c. That is, the shape of the reflected light becomes a circle as shown in FIG. 9B when it matches the proper focal length, and when it is closer than the proper focal length, it becomes diagonally to the left as shown in FIG. When it is farther than the distance, it is obliquely deformed to the right as shown in FIG. 9C. Therefore, when the arithmetic processing unit 51 recognizes the shape of the reflected light incident on the light receiving units 331a and 331c and the focal length is deviated, the distance is longer (far) or shorter than the appropriate focal length ( (J), and if they are close, the output shafts 61a of the three ultrasonic motors 61 of the tilting table 6 are lowered by the same amount by the amount of misalignment to match the proper focal length (K). ). On the contrary, when it is far, the three ultrasonic motors 6 of the tilting table 6
The output shaft 61a of No. 1 is pulled up by the same amount by the amount of deviation and is adjusted to an appropriate focal length (L). From the above, the measurement point i
= 1 is set to an appropriate focal length position (M).

Next, the deviation of the focal length between the two measurement points (i = 2, 3) is measured in the same manner. That is, the arithmetic processing unit 51 sets (N) the second measurement point i = 2 which is separated from the measurement point i = 1 by a predetermined distance, and this X
The moving means 2 is moved so that the optical axis of the microscope 3 coincides with the Y coordinate position (H). Then, the laser spot is projected at this position, and the amount of deviation between this measured distance and the appropriate focal length is calculated and recorded by the same means as described above (M). Then, the arithmetic processing unit 51 sets the measurement point i = 1.
Set a third measurement point i = 3, which is a predetermined distance from
The moving means 2 is moved to this XY coordinate position (H), and in the same manner as described above, the amount of deviation between this measured distance and the appropriate focal length is calculated and recorded (M). After the measurement at the measurement point i = 3, the measurement of the focal length ends due to the discriminant i> 3 (O).

From the above, the three measurement points i = 1, 2, 3
Since the amount of deviation from the proper focal length at each XY coordinate position is known, the inclination of the track detection solid 1 in the XY directions is geometrically calculated from this three-dimensional coordinate position. It is possible to calculate the respective vertical adjustment amounts of the output shafts 61a of the three ultrasonic motors 61, which are necessary to correct this deviation amount. Then, the arithmetic processing unit 51 determines the output shafts 61 of the three ultrasonic motors 61 based on the calculation result.
The feed amount of a is adjusted, and the tilt amount is adjusted (P).

As described above, when the tilting table 6 is moved by the moving means 2, the surface of the image pickup portion of the track detection solid 1 becomes horizontal. Next, referring to FIG.
A procedure for imaging the track detection solid 1 with the line sensor 4 will be described. This imaging is controlled by a program built in the arithmetic processing unit 51 of the personal computer. First, the arithmetic processing unit 51 uses the encoder to measure the measurement position j =
0 and k = 0 are set (A1), and this measurement position j = 0
The coordinates are recognized as X = 0 and Y = 0 (0, dy × j). Then, the moving means 2 is placed at the XY coordinate (0, 0) position.
The track detection solid 1 is moved by (A2). This XY coordinate (0, 0) position is the lower left corner 11a of the measurement area 11 shown in FIG. 7, and this point is the starting point for starting imaging.

Now, when the starting point of the imaging position is set at the position of the lower left corner 11a of the measurement area 11, the arithmetic processing unit 51
The focusing means 331 adjusts the focus (adjusts the focal length), and if the focus is deviated, the three ultrasonic motors 61 are driven by the same amount to perform the focus adjustment (A3). That is, FIG.
As shown in 1, focus adjustment is started (B1). The arithmetic processing unit 51 determines from the information obtained by the focusing means 331 whether the focus is deviated by the allowable amount or more (B2). If the focus is deviated by the allowable amount or more, the displacement is close (B3). The output shafts 61a of the three ultrasonic motors 61 are lowered by the same amount by the amount of the shift (B4) to adjust to the proper focal length. On the contrary, when the distance is far, the output shafts 61a of the three ultrasonic motors 61 are pulled up by the same amount by the amount of deviation (B
5). Then, the movement amount dx = 0 of the X axis is set (A
4) The line image captured by the line sensor 4 at the measurement position (0, 0) is recorded, and the movement of the moving means 2 is started at a constant speed in the X direction (A5). The moving amount of the moving means 2 is measured by the encoder and the data is sent to the arithmetic processing unit 51. When it is determined by the arithmetic processing unit 51 that the moving means 2 has moved the measurement region 11 in the X direction by one measurement width of the line sensor 4 (A6).
Similarly, the line image from the line sensor 4 at the second measurement position (1dX, 0) is recorded (A7). Then, the arithmetic processing unit 51 adds 1 to k every time one line is recorded (A8). Then, the arithmetic processing unit 51 moves the moving means 2 in the X direction at a constant speed until the measurement position reaches the lower right corner of the measurement area 11 shown in FIG.
Line images are sequentially recorded for a range of columns.

The line image has k lines, that is, X.
When 25% of the length L in the direction (corresponding to the area k in FIG. 7) is recorded (A9), the arithmetic processing unit 51 extracts the etch pit feature amount for the area k in parallel with the recording of the line image (A9).
10). After extracting the etch pit characteristic amount, k is set to k = 0 (A11). In the extraction of the etch pit feature amount, the arithmetic processing unit 51 recognizes the shape of the etch pit in the image in the region k, compares it with the pre-recorded etch pit pattern, and determines the type of the etch pit. This is done by totaling and recording the quantity of each type. That is, the arithmetic processing unit 51 records the line image of the length L in the X direction, and when data of 25% (k lines) of the length L is input, parallel to the line image recording work each time. Then, the etch pit characteristic amount is extracted based on the input data. Therefore, when the scanning of the range of one row having the length L is completed, the etch pit feature amount extraction is performed four times.

The bottom of the measurement area 11, that is, the Y coordinate =
Acquisition of the imaged data of 0 is completed (A12)
Then, the arithmetic processing unit 51 ends the focus adjustment work (A1
3) Then, j = 1 is set in the encoder (A14), and the measurement position is moved to the XY coordinate X = L, Y = dY (L, dY × j) position by the moving means 2. This position is shown in FIG.
From the lower left corner 11a of the measurement area 11 shown in (1) to the right in the X direction by L and at the position moved in the Y direction by the length of the line sensor 4. Then, at the position of Y coordinate = dY, line images are sequentially captured from the right end to the left end of the measurement area 11. In this way, while changing the scanning direction of the sequential line images from right to left or from left to right, at the moment when the line sensor 4 moves to a new imaging range, the arithmetic processing unit 51 sequentially outputs the sequential line images. Record along with measurement coordinates.
Then, when j> n is reached (A15), the arithmetic processing unit 51
Judges that the entire area of the measurement area 11 has been imaged, and displays the integration of the extraction results and the display of the entire area on the display unit 52 (A16).

In the above-described continuous image pickup, the deviation from the focal length is checked (so-called focus adjustment) by the procedure described above each time, and if the deviation exceeds the permissible amount, the focal distance is adjusted. By the way, as described above, the line sensor sequentially captures line images when the imaging range moves one unit to the left and right. Therefore, the adjustment of the focal length of the line image to be captured needs to be completed in advance before capturing the line image, that is, before the movement of the image capturing range ends. To do this,
It is necessary that the laser spot shown in (1) is projected at a position that always precedes the imaging range B of the moving line image. For example, when the imaging range B of the line image moves to the right, it is necessary to project the laser spot at the near position C1 on the right side of the imaging range B. Then, when the imaging range B of the line image moves to the left, it is necessary to project the laser spot at the near position C2 on the left side of the imaging range B.

By the way, as described above, the line sensor 4
The line image by the
The track detecting solid 1 is moved by the moving means 2 in the Y direction by the length of the line sensor, and the single line image is again taken in the X direction. In this case, if the movement in the X direction is always in the same direction from left to right, it is necessary to return the track detection solid 1 to the left end for each row. Therefore, it is possible to perform quicker imaging by changing the moving direction in the X direction for each row and moving in a zigzag manner such as moving from left to right and then moving from right to left.

When moving zigzag in this way,
As described above, it is necessary to change the position at which the laser spot is projected according to the change in the traveling direction. However, in order to perform the position for projecting the laser spot by one set of the projecting section and the light receiving section, an extremely complicated switching structure is required. Therefore, in the present invention, two sets of the light projecting units 3 are provided.
31b and 331d and light receiving portions 331a and 331c are used, and a configuration is used in which they are selectively used depending on changes in the traveling direction.

The configuration of the line sensor 4 is not limited to the case where about 4000 CCDs are arranged one by one, but several CCDs may be arranged longer. In addition, the smaller the size of each pixel of the line sensor 4, the better the resolution of the image that can be picked up. However, when using the large size pixel,
If the enlargement ratio of imaging is increased, an image with good resolution can be taken. In consideration of the reduction of the processing time, the determination of the type of the etch pit and the totalization of the number of each type, as described above, have a predetermined range of the measurement region 11, for example, the length L.
It is desirable to perform the procedure for every 25% of the range of 1 column and to add up at the end, but after the image of the range of 1 column is obtained or after the line image is obtained for the entire range of the measurement region 11. , You can also do it all at once.

Further, a picked-up image from the two-dimensional CCD sensor 332 or a reflected image of a laser spot is displayed on the display section 53, and while observing this display screen, the moving means 2 and the chill unit are manually input by the input means 52. The adjusting table 6 can be easily adjusted. The two-dimensional CCD sensor 332 is not limited to this, and may be a solid-state image sensor such as a CMOS sensor.

[0042]

Since the solid of the track detecting object is imaged by using the line sensor, the incident amount and the incident direction of the radiation can be judged extremely quickly.

[Brief description of drawings]

FIG. 1 is a partial side view of a radiation track detection device.

FIG. 2 is a front view of a radiation track detection device.

FIG. 3 is a schematic configuration diagram of a focusing unit and a two-dimensional CCD sensor.

FIG. 4 is a field of view of a microscope showing an imaging range of a line sensor and a laser spot position.

FIG. 5 is a field of view of a microscope showing an imaging range of a line sensor and a two-dimensional CCD sensor.

FIG. 6 is a flowchart showing a procedure of using the radiation track detecting device.

FIG. 7 is an explanatory diagram showing an imaging range and order of line images in a measurement region.

FIG. 8 is a flowchart showing a procedure for adjusting the focal length and the inclination of the solid for track detection.

FIG. 9 is an image diagram showing a reflection shape of a laser spot.

FIG. 10 is a flowchart showing a procedure for capturing a line image.

FIG. 11 is a flowchart showing a procedure for adjusting the amount of deviation of the focal length.

[Explanation of symbols]

1 Solids for track detection 11 measurement area 2 means of transportation 3 Enlarging means (microscope) 31 eyepiece 32 lamps 33 AF unit 331 Focusing means 332 Two-dimensional CCD sensor 34 lens barrel 35 Eyepiece for visual observation 4 Imaging means (line sensor) 5 Judgment means 51 arithmetic processing unit 52 display 53 Input means 6 tilting table 61 Ultrasonic motor 61a Output shaft

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshihiro Honma             Sei 1-1 Akanehama, Narashino City, Chiba Prefecture             Co-Precision Co., Ltd.

Claims (3)

[Claims] 1. A moving step of moving a solid for detecting a track of radiation, an enlarging step of enlarging the solid for detecting a track with a microscope, and an imaging for picking up the enlarged solid for track detecting as a line image with a line sensor. A step of creating a solid image for track detection from the line image, and a determination step of determining at least one of the incident amount or the incident direction of the radiation from the image. Track detection method. 2. The moving step according to claim 1, wherein the support base supporting the track detection solid is horizontally moved by a motor, and the imaging step includes the enlarged track detection solid in the line. A method for detecting a track of radiation, comprising the step of capturing an image with the line sensor each time the sensor is moved by the width of the sensor. 3. A moving means for moving the solid for detecting a track of radiation, a microscope for enlarging the solid for detecting a track, a line sensor for picking up the expanded solid for detecting a track as a line image, and the line image. A radiation track detecting device, comprising: a creating unit that creates an image of the track detection solid according to 1. and a determining unit that determines at least either an incident amount or an incident direction of the radiation from the image.