JPH01197608A - Measuring instrument - Google Patents

Abstract

PURPOSE:To take measurements as to the internal structure of a body to be measured with high accuracy by gathering data regarding the dose of radiation which is transmitted through the body to be measured in mutually different radiation directions. CONSTITUTION:A control part 29 which incorporates a microcomputer, etc., is connected to data gathering parts 19a and 19b and a movement quantity detection part 21, and those data gathering parts 19a and 19b and detection part 21 are controlled by the control part 29. Further, the control part 29 sends out the pulse signal from the detection part 21 to a central controller 31 as data regarding the movement quantity of a cable 9. The controller 31 analyzes the internal structure, etc., of the body to be measured according to data gathered by those data gathering means. Namely, the gravity center arithmetic means and radius arithmetic means in the controller 31 calculates the center of gravity and radius from said data. Further, a cross figure generating means generates the cross section of the body to be measured from the center of gravity and radius which are found by said arithmetic operation.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a measuring device that uses radiation such as X-rays, and particularly relates to a measuring device that measures the internal structure of an object to be measured. be.

(Prior art) X-rays, which are a type of electromagnetic waves, have a strong ability to penetrate materials (penetration ability), and therefore various measurement devices that utilize the properties of X-rays have been proposed and are widely used in industrial fields. ing.

FIG. 6 is an explanatory cross-sectional view of a conventional measuring device that measures the amount of eccentricity of a core wire in a cable using X-rays.

A fluorescent screen 1 is placed opposite an X-ray tube 101 for emitting X-rays.
03, and the X-rays transmitted through the cable 105, which is the object to be measured, are applied to the fluorescent screen 103. cable 1
05 is made up of a core wire 107 and ten insulators that cover the core wire 107 to protect the core wire 107, and the core wire 107 made of copper, aluminum, etc. and the insulator 109 made of butyl rubber, etc. are made of different materials. Because of that
The transmission m of the lines is different.

The fluorescent screen 103 fixed to the dark box device 111 is made of a material such as a scintillator that emits light when irradiated with X-rays.
given to 15. A perspective image of the cable 105 taken by the TV camera 115 is displayed on the display 117.

Furthermore, the X-ray tube 101 and the dark box device 111 are configured to be able to rotate around the position of the cable 105, and when the measurement from the vertical direction shown in FIG. 6 is completed, the X-ray tube 101 and the dark box device 111 111 by 90 degrees and measure the cable 105 in the same way from a direction 90 degrees different from the previous time.

As shown in FIG. 7, the display 117 determines the distance between the core wire 107 and the insulator 109 from a perspective image obtained by irradiating X-rays from different directions at 90 degrees to the cable 105. Love 2, IL3. fL4 is measured once, and these interval sentences +, fL2. fL3. (From i4,
The amount of eccentricity of the core wire 107 within the cable 105 can be measured.

(Problem to be Solved by the Invention) However, since the cable 105 is not necessarily located precisely at the center of the rotation, for example, if the cable 105 moves relatively in the same direction as the radiation direction of the X-rays due to the rotation, The magnification of the perspective image changes, and the value of the eccentric aperture changes.

For this reason, there are inconveniences such as a product being determined to be defective even though the amount of eccentricity is actually within an allowable range, or conversely, a defective product being determined to be a non-defective product.

The present invention has been made in view of the above, and an object of the present invention is to provide a measuring device that can measure the internal structure of an object to be measured, such as eccentricity, with high precision.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention emits radiation toward a measured object from multiple directions and collects data regarding m of the radiation transmitted through the measured object. A device for measuring the object to be measured includes a center of gravity calculation means for calculating the center of gravity of the object to be measured based on the collected data, and a center of gravity calculation means for calculating the center of gravity of the object to be measured based on the collected data. It has a radius calculating means for calculating, and a cross-sectional view creating means for creating a cross-sectional view of the object to be measured from the calculated values of the center of gravity and radius, and based on the data collected from the cross-sectional view, etc. It was configured to analyze the inside of the body.

(Function) The measuring device of the present invention first emits radiation toward the object to be measured from a predetermined direction, collects data regarding m of the radiation that has passed through the object, and also emits radiation from other directions. data on the amount of radiation transmitted through the measured object.

Next, the center of gravity calculation means and the radius calculation means calculate the center of gravity and radius, respectively, based on this plurality of data. Further, the cross-sectional diagram creating means creates a cross-sectional diagram of the object to be measured from the center of gravity and radius determined by this calculation.

Therefore, in this measuring device, the inside of the object to be measured can be easily analyzed from the cross-sectional view.

(Example) Hereinafter, an example according to the present invention will be described in detail with reference to the drawings.

First, the overall configuration of this embodiment will be explained with reference to FIG.

An X-ray tube 1a serving as a radiation source generates X-rays, and radiates these X-rays 3a from a window 7a provided in the measurement box 5 toward a cable 9 that is the object to be measured. The cable 9 is formed of a core wire 11 and an insulating part 13 for protecting the core wire 11.
Since the core wire 11 and the insulating portion 13 are made of different materials, the wires m passing through each are different. Such a cable 9
The X-rays 3a that have passed through the window 15a travel to the X-ray line sensor 17a.

The X-ray line sensor 17a is arranged in correspondence with radiation/light signal conversion means such as a scintillator that generates an optical signal in accordance with the amount of irradiated X-rays, and the radiation/light signal conversion means. It has an optical/electrical signal conversion means such as a photodiode array that converts the optical signal from the conversion means into an electric signal.

The data collection unit 19a is connected to the X-ray line sensor 17a, and collects the electric signal converted by the X-ray line sensor 17a as data regarding the X-rays transmitted through the object to be measured. The data collecting section 19a, the X-ray line sensor 17a, and the X-ray tube 1a constitute a first data collecting means.

It has the same configuration as the first data collection means for emitting X-rays from a direction 90 degrees different from the first data collection means described above and collecting data regarding the hanging of the X-rays that have passed through the cable 9. A second data collection means is provided.

Specifically, the X-ray tube 1b emits X-rays 3b from the window 7b toward the cable 9, and the X-rays 3b transmitted through the cable 9 proceed to the X-ray line sensor 17b through the window 15b. The data finally converted into electrical signals by this X-ray line sensor 17b is collected by a data collection unit 19b.
given to.

Next, referring to FIG. 2, the movement amount detection section 21 for detecting the movement amount of the cable 9 and its peripheral devices will be explained.

When the core wire 11 is sent out by the core wire delivery roller 23, a member for forming the insulating portion 13 is extruded from the extruder 25 together with the core wire 11, and the cable 9 is generated. This cable 9 is introduced into the measurement box 5. Since the amount of movement of the cable 9 associated with the generation of the cable 9 corresponds to the feeding m of the core wire 11, the vJin detection section 21 is moved to the core wire feeding roller 23 and attached thereto. The movement amount detection section 21 outputs a pulse signal in accordance with the rotation of the core wire feed roller 23, for example.

Referring again to FIG. 1, the control section 29 containing a microcomputer or the like is a data collection section 19a.

19b and the movement amount detection section 21, and the data collection sections 19a, 19b and the movement R detection section 21 are controlled by the control section 29. Further, the control section 29 sends the pulse signal from the movement amount detection section 21 to the central control device 31 as data related to the movement amount of the cable 9.

The central control device 31 has a built-in CPU 33 formed of a microcomputer or the like to analyze the internal structure of the object to be measured based on the data collected by the data collection means described above.

CPU 33 connects I10 bus 35 and interface circuit 3
The CPU 33 is connected to the control section 29 via the CPU 33, and the CPU 33 sends control commands related to data collection to the control section 29.

Further, the CPU 33 is connected to a main memory 41 and an optical disk device 43 via three DMA buses. The main memory 41 stores various control programs such as a center of gravity calculation program, a radius calculation program, and a sectional view creation program. The CPLI 33 executes various control processes based on control programs stored in the main memory 41. The CPU 33 has a DMA bus 39, a multipath (M
B) Interface circuit 45, multipath 47, a center of gravity calculator 51 constituting a center of gravity calculating means, a radius calculator 53 constituting a radius calculating means, a cross-sectional diagram creator 55 constituting a cross-sectional diagram creating means, and an image processing section. 57, image memory 59,
It is connected to each of the display device interface circuits 61. In addition, each of the center of gravity calculator 51, radius calculator 53, cross-sectional view creator 55, image processing unit 57, image memory 59, and display interface circuit (DISP[/F) 61 is connected to each other via an image bus 65. has been done.

The center of gravity calculator 51 calculates the position of the center of gravity of the object to be measured. The radius calculator 53 calculates dimensions such as the radius of the object to be measured. The cross-sectional diagram creator 55 includes a center of gravity 31 calculator 51 and a radius calculator 53
A cross-sectional view of the object to be measured is created based on each calculation result.

The image processing section 57 executes various image processing based on instructions from the CPU 33.

The five image memories are connected to the data collection units 19a and 19b via the image interface circuit 67, and store data related to perspective images of the object collected by the data collection units 19a and 19b.

The display device 69 is connected to the center of gravity calculator 51, radius calculator 53, cross-sectional view calculator 55, etc. via the display interface circuit 61, and displays the calculation results of each of these calculators or the created cross-sectional view, etc. Display.

Next, the operation will be explained with reference to FIGS. 3, 4, and 5.

In step 81 shown in FIG. 5, image data, that is, data relating to a perspective image of the cable 9 is collected. To explain this data collection, the movement amount detection section 21 sends out a pulse signal according to the movement amount of the cable 9. The X-rays 3a and 3b transmitted through the cable 9 are sent to the X-ray line sensor 17a.
, 17b, and each X-ray line sensor 17a
, 17b, the radiation/optical signal converting means converts the optical signal into an optical signal corresponding to the irradiated X-ray dose, and the optical/electrical signal converting means converts this optical signal into an electrical signal. light/
The electric signal converting means has a plurality of converting elements arranged in a straight line perpendicular to the traveling direction of the X-rays, and stores the converted electric signals in the form of electric charges, and this accumulated electric charge is used as described above. The data is sequentially read out as linear line data in synchronization with the pulse signal from the movement amount detection section 21.

Hereinafter, of the X-ray line sensors 17a and 17b, the X-ray line sensor 17a will be specifically explained as an example. As shown in FIG. 3, the X-rays 3a transmitted through the cable 9 are irradiated onto the X-ray line sensor 17a, and a perspective image 11a corresponding to the core wire 11 and a perspective image 13a corresponding to the insulating portion 13 are obtained. Among these perspective images 11a and 13a, a line sensor surface 18a where a plurality of conversion elements are arranged linearly
The above line data is sequentially output as the cable 9 moves. These line data are collected by the data collection unit 19a,
19b and stored in the image memory 59 via the image interface circuit 67.

Next, in step 83, the center of gravity calculator 51 operates, and the center of gravity calculator 51 operates to calculate the
The positions of the centers of gravity of the cable 9 body and the core wire 11 are calculated based on each data from 7b. That is, as shown in FIG. 3, the distances l11tLa, Lb, Lc, and Ld between each end of the perspective images 11a and 13a and the center line P1 of the measurement system are determined, and the position Ga of the hypocenter is calculated by Luko.

Further, in step 83, as shown in FIG. 4, the distance fmL2 from the radiation point F+ from which the X-rays 3a are radiated to the point of contact between the X-rays 3a and the cable 9 is calculated.

In step 85, the radius calculator 53 operates to calculate the radius r1 of the cable 9 based on the data stored in the perspective image memory 59.

Hereinafter, calculation of the radius r1 will be specifically explained using a mathematical formula.

The distance L4 from the line segment P3 passing through the center of gravity Ga of the cable 9 to the irradiation point of the X-ray 3a on the line sensor 18a is determined from the calculation result of the center of gravity position in step 83 described above. Furthermore, since the line segment P4 and the line sensor 9 surface 18a are parallel, the following total n equations can be obtained.

2XL4 = L5 X (LO/L2)
-”・(+)However, L5...Distance LO between both contact points where the X-ray 3a and cable 9 touch...Distance L2 from radiation point F1 to line sensor 18a...Line from radiation point F1 Distance to minute P4 or distance m
L5 is calculated by the following equation (2).

L5 = 2r 1 xcosθ...
・1(2) However, cos θ=LO/F shoulder ゝ; "n) Therefore, the radius r1 is calculated by the following equation (3).

r + = (L4 X L2) / (LOXCO
3θ)-(3) Here, the distance ML2 is expressed as in equation (4).

12 = LI - L3...
(4) However, 13 = r + sinθ
・(5) Substituting equation (5) into equation <4), L2 = L+ −r' l5inθ ・<
61 However, when sinθ−L 4 / (u) (3) is substituted into equation (6), r + = (L4 XLI ＞/ (Lacosθ+143inθ) −<7>
As described above, the radius r1 of the cable 9 is calculated using equation (7).

Next, in step 87, the X-ray lenses 17a and 17
The average value of the radius r1 calculated from both data of b is calculated.

Subsequently, in step 89, the radius r2 of the core wire 11 is calculated in the same manner as the radius r1 described above. Next, in step 91, the cross-sectional view generator 55 is operated to create a cross-sectional view of the cable 9 based on the position of each center of gravity and the respective nose ends of the radii rl and r2. In step 93, the uneven thickness of the core wire 11 in the cable 9, that is, the deviation of each center of gravity of the cable 9 and the core wire 11, and the outer dimensions of the cable 9 are calculated. These calculation results are sequentially displayed on the display 69.

In the embodiment described above, radiation such as X-rays is emitted toward the object to be measured from multiple directions, and data regarding the amount of radiation transmitted through the object to be measured is collected from each direction, so that it is possible to destroy the object to be measured. The internal structure of the object to be measured, such as eccentricity m, can be measured easily and with high accuracy.

Although FIG. 1 illustrates a cable as an example of the object to be measured, the present invention is not limited thereto and can be applied to any suitable object to be measured, such as a golf ball.

[Effects of the Invention] As explained above, according to the present invention, a plurality of data regarding the dose transmitted through the object to be measured from a plurality of directions in which the radiation direction of radiation is different from each other is collected, and the data is calculated based on this data. Since the inside of the object to be measured is analyzed based on the calculated values of the center of gravity, radius, etc., it is possible to measure the internal structure of the object to be measured, such as a cross-sectional view, with high precision.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the movement m detection section of FIG. 1 and its peripheral devices, and FIGS. An explanatory diagram showing the operation of the embodiment, FIG. 5 is a flowchart showing the control operation of the CPU in the embodiment of FIG. 1, FIG. 6 is an explanatory diagram showing the conventional example, and FIG. FIG. 2 is an explanatory diagram showing a perspective image of an object to be measured obtained in a conventional example. 1a, 1b...X-ray tube 3a, 3b...X-ray 9...Cable 17a, 1
7b... X-ray sensor 19a, 19b... Data collection unit 51... Center of gravity calculator 53... Radius calculator 55.
・・Cross-section diagram creator

Claims (1)

[Scope of Claims] An apparatus that emits radiation toward a measured object from multiple directions, collects data regarding the dose that has passed through the measured object, and measures the measured object, comprising: a center of gravity calculation means for calculating the center of gravity of the object to be measured based on the collected data; a radius calculation means for calculating the radius of the object to be measured based on the collected data; and a center of gravity calculation means for calculating the radius of the object to be measured based on the collected data; 1. A measuring device comprising: a cross-sectional view creating means for creating a cross-sectional view of an object to be measured, and analyzing the inside of the object to be measured from this cross-sectional view.