CN106546610A - The test system of spatial resolution - Google Patents
The test system of spatial resolution Download PDFInfo
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- CN106546610A CN106546610A CN201610971899.0A CN201610971899A CN106546610A CN 106546610 A CN106546610 A CN 106546610A CN 201610971899 A CN201610971899 A CN 201610971899A CN 106546610 A CN106546610 A CN 106546610A
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- spatial resolution
- lobe
- groove
- test system
- thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V13/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups G01V1/00 – G01V11/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity
Abstract
A kind of test system of spatial resolution is embodiments provided, including：X-ray machine, for launching the X-ray of CT spatial resolution test；Examination criteria part, examination criteria part have standard component body, periodic arrangement test department and isolation part on standard component body, and the test department has lobe and groove；Detector, X-ray is received by a detector after the lobe and groove of testing standard part, and it is converted into the signal of telecommunication, convert electrical signals to visual gray level image, the edge of gray level image has convex and concave feature, and as the size of the line pair is gradually decreased, the size of the convex and concave feature is also gradually decreased, when the difference of the convex and concave feature point gray value low spot and gray value high point reaches first threshold, the demand pairs in unit length 1MM are corresponding spatial resolution.The test system of spatial resolution of the present invention, realizes reduction difficulty of processing and cost, reduces detection time cost, and accuracy of detection is higher.
Description
Technical field
The present invention relates to a kind of test system of spatial resolution, more particularly to a kind of test system of CT spatial resolution
System.
Background technology
At present, the spatial resolution of CT is usually used line to card, but line is put to card and must be perpendicular to X-ray outgoing side
To otherwise putting to incline to cause the spatial resolution test of CT inaccurate.Secondly line is special to the iron wire of testing standard part in card
Thinless, processing and put when arranged side by side can be restricted.
The content of the invention
The purpose of the present invention is the defect for prior art, there is provided a kind of test system of spatial resolution, so as to profit
Used in the test department detection spatial resolution of periodically-varied on testing standard part, difficulty of processing and cost are reduced, detection is reduced
Time cost, accuracy of detection are higher.
For achieving the above object, a kind of test system of spatial resolution, the system bag are embodiments provided
Include：
X-ray machine, for launching the X-ray of CT spatial resolution test；
Examination criteria part, the examination criteria part have the survey of standard component body, periodic arrangement on standard component body
There is lobe and groove, one group of adjacent lobe and groove to constitute a line pair, institute for examination portion and isolation part, the test department
State the depth rule change of the thickness and groove of lobe；
Detector, the detector are arranged oppositely relative to the examination criteria part with the X-ray machine, and the X-ray is led to
Received by the detector after the lobe and groove of crossing the testing standard part, and be converted into the signal of telecommunication, by the signal of telecommunication
Be converted into visual gray level image, the edge of the gray level image has convex and concave feature, with the line pair size by
Decrescence few, the size of the convex and concave feature is also gradually decreased, when the convex and concave feature point gray value low spot and gray value high point it
When difference reaches first threshold, the demand pairs in unit length 1MM are corresponding spatial resolution.
Further, the depth of the thickness and groove of the lobe reduces paragraph by paragraph according to each segmentation, and each is segmented it
Between have an isolation part.
Further, the thickness of the lobe in the same segmentation is identical, and depth of groove is identical.
Further, the thickness of the lobe in the same segmentation is identical with depth of groove.
Further, the boss numbers in each segmentation are identical, and number of recesses is identical.
Further, the difference of the depth of the thickness and groove of the lobe between adjacent packets is 0.1mm.
Further, the standard component body is cylinder.
Further, the isolation part thickness is more than maximum lobe thickness.
The test system of spatial resolution of the present invention, the test department detection using the periodically-varied on testing standard part are empty
Between resolution, it is achieved thereby that reducing difficulty of processing and cost, and reduce detection time cost, accuracy of detection is higher in addition.
Description of the drawings
Fig. 1 is the structural representation of the test system of spatial resolution provided in an embodiment of the present invention.
Specific embodiment
Below by drawings and Examples, technical scheme is described in further detail.
Fig. 1 is the structural representation of the test system of spatial resolution provided in an embodiment of the present invention, as shown in figure 1, this
The test system of the spatial resolution of inventive embodiments includes：X-ray machine 1, examination criteria part 2 and detector 3.
The effect of X-ray machine 1 is for launching electronics computed tomography (Computed Tomography, CT) space
The X-ray of resolution test；The purpose of the X-ray is for detecting CT spatial resolution.
Again as shown in figure 1, examination criteria part 2 has survey of the standard component body 20, periodic arrangement on standard component body
Examination portion 21 and isolation part 23, test department have lobe 210 and groove 211, one group of adjacent lobe and groove composition one
Individual line pair, the depth rule change of the thickness and groove 211 of lobe 210.The specific regular change is each point
The section thickness of lobe and the depth of groove reduce paragraph by paragraph, and the thickness of the lobe in the same segmentation is identical, depth of groove phase
Together, there is an isolation part 23 between each segmentation, isolation part thickness is more than maximum lobe thickness, the projection in each segmentation
Portion's quantity is identical, and number of recesses is identical, and the difference of the depth of the thickness and groove of the lobe between adjacent packets is that 0.1mm is piecewise
Successively decrease change.
Specifically, the making material of examination criteria part 2 can be aluminum, ferrum etc., and the body of preferred standard component 2 is cylinder
Shape.Test department 21 is periodically arranged in the outside of standard component body 20.Optional examination criteria part 2 can divide four sections, each
Section lobe 210 thickness and groove 211 depth can by 0.3mm, 0.4mm, 0.5mm, 0.6mm be distributed paragraph by paragraph, optionally
Per section of 8 lobe of distribution and 8 grooves, are separated by the equal isolation part 23 of thickness between adjacent segment, it is to avoid between different groups
Interfere with each other, optional isolation part thickness is 2mm., in addition, the processing method of lobe 210 and groove 211 can be spiral
Processing, the machining accuracy of the processing mode can be made to card than conventional line, and the course of processing is more convenient, processing cost ratio
Prior art is much lower.
Detector 3 is arranged oppositely relative to examination criteria part 2 with X-ray machine 1, and X-ray is convex by the testing standard part
Received by detector 3 after playing portion 210 and groove 211, and be converted into the signal of telecommunication, convert electrical signals to visual gray-scale maps
There is convex and concave feature, one group of lobe of identical and groove to constitute a line pair for picture, the edge of the gray level image of output, with
The size of line pair is gradually decreased, and the size of convex and concave feature is also gradually decreased, when the convex and concave feature point gray value low spot and gray scale
When the difference of value high point reaches first threshold, the as corresponding spatial resolution of the demand pairs in unit length 1MM, optional first
Threshold values is 10%.
Specifically, using method：Examination criteria part 2 is placed on X-ray machine 1 to export and detector 3, is adjusted to three points one
Line, adjusts CT amplifications by CT Image Adjustings to correct position.Test X-ray from 1 outgoing of X-ray machine is through examination criteria
After the lobe 210 and groove 211 of part 2, X-ray is received by detector 3, X-ray is converted into the signal of telecommunication then is carried out subsequently
Process.The signal of telecommunication is then converted to into optical signal, it is therefore an objective to for detecting the precision of image in optical signal.For example, optionally,
Examination criteria part 2 is divided into 4 sections, and the groove depth of different sections is followed successively by 0.3mm, 0.4mm, 0.5mm, 0.6mm from top to bottom, different sections
Bossing thickness is followed successively by 0.3mm from top to bottom, 0.4mm, 0.5mm, 0.6mm, isolation part thickness 2mm, line from top to bottom
1.667lp/mm, 1.250lp/mm, 1.00lp/mm, 0.834lp/mm are corresponded to being converted into accuracy value, if CT machines judge
When the difference of convex and concave feature point gray value low spot and gray value high point reaches first threshold, optional first threshold values is 10%, identification
Go out the line pair that groove depth is 0.3mm, the spatial resolution of CT machines is 1.667lp/mm, and this CT spatial resolution is with convex and concave feature
The difference of point gray value low spot and gray value high point reaches the first threshold requirements, and in unit length 1MM, demand pairs are determining.
The spatial resolution general line of CT of the prior art is to card, but line is especially thin to the iron wire in card, process with
And put when side by side can be restricted, high processing costs, precision are relatively low, and put and must be perpendicular to X-ray exit direction, no
Can incline, otherwise test inaccurate.
And the processing of the lobe and groove of the examination criteria part of the present invention can carry out screw processing using lathe, and car
The processing cost of bed is low, and machining accuracy can be reduced to micron level, and manufacturing tolerance is more controllable, realizes higher detection
Precision.Therefore compared with line for card, the examination criteria part of cylinder, because more convenient, detection simplicity is put, and
Need not change, CT spatial resolution can be just detected using an examination criteria part.
Above-described specific embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, the be should be understood that specific embodiment that the foregoing is only the present invention is not intended to limit the present invention
Protection domain, all any modification, equivalent substitution and improvements within the spirit and principles in the present invention, done etc. all should include
Within protection scope of the present invention.
Claims (8)
1. a kind of test system of spatial resolution, it is characterised in that the system includes：
X-ray machine, for the X-ray of launching electronics computer tomography CT spatial resolution test；
Examination criteria part, the examination criteria part have the test department of standard component body, periodic arrangement on standard component body
And isolation part, there is the test department lobe and groove, one group of adjacent lobe and groove to constitute a line pair, described convex
The depth rule change of the thickness and groove in the portion of rising；
Detector, the detector are arranged oppositely relative to the examination criteria part with the X-ray machine, and the X-ray passes through institute
Received by the detector after the lobe and groove of stating testing standard part, and be converted into the signal of telecommunication, the signal of telecommunication is converted
For visual gray level image, the edge of the gray level image has convex and concave feature, as the size of the line pair gradually subtracts
Few, the size of the convex and concave feature is also gradually decreased, when the convex and concave feature point gray value low spot is reached with the difference of gray value high point
During to first threshold, the demand pairs in unit length 1MM are corresponding spatial resolution.
2. the test system of spatial resolution according to claim 1, it is characterised in that the thickness of the lobe and recessed
The depth of groove reduces paragraph by paragraph according to each segmentation, has an isolation part between each segmentation.
3. the test system of spatial resolution according to claim 2, it is characterised in that the lobe in same segmentation
Thickness it is identical, depth of groove is identical.
4. the test system of spatial resolution according to claim 2, it is characterised in that the lobe in same segmentation
Thickness it is identical with depth of groove.
5. the test system of spatial resolution according to claim 2, it is characterised in that the lobe number in each segmentation
Amount is identical, and number of recesses is identical.
6. the test system of spatial resolution according to claim 2, it is characterised in that described convex between adjacent packets
The difference of the depth of the thickness and groove in the portion of rising is 0.1mm.
7. spatial resolution test system according to claim 1, it is characterised in that the standard component body is cylinder
Shape.
8. the test system of spatial resolution according to claim 1, it is characterised in that the isolation part thickness is more than most
Big lobe thickness.
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| CN201610971899.0A CN106546610A (en) | 2016-10-28 | 2016-10-28 | The test system of spatial resolution |
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| CN201610971899.0A CN106546610A (en) | 2016-10-28 | 2016-10-28 | The test system of spatial resolution |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108844977A (en) * | 2018-04-25 | 2018-11-20 | 中国兵器科学研究院宁波分院 | A kind of industrial CT system spatial resolution test method and evaluation method rejecting angle tilt and influencing |
| CN109143404A (en) * | 2018-07-24 | 2019-01-04 | 深圳市华讯方舟太赫兹科技有限公司 | Resolution test method, test device and the storage medium of detecting devices |
| CN111879799A (en) * | 2020-07-03 | 2020-11-03 | 中国兵器科学研究院宁波分院 | Manual testing method for spatial resolution of optical system |
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Cited By (4)
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| CN109143404A (en) * | 2018-07-24 | 2019-01-04 | 深圳市华讯方舟太赫兹科技有限公司 | Resolution test method, test device and the storage medium of detecting devices |
| CN111879799A (en) * | 2020-07-03 | 2020-11-03 | 中国兵器科学研究院宁波分院 | Manual testing method for spatial resolution of optical system |
| CN111879799B (en) * | 2020-07-03 | 2022-08-26 | 中国兵器科学研究院宁波分院 | Manual testing method for spatial resolution of optical system |
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Application publication date: 20170329 |
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