CN105954502A - Radar wave-based nondestructive test method for internal defects of wooden pillars of antique building - Google Patents
Radar wave-based nondestructive test method for internal defects of wooden pillars of antique building Download PDFInfo
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- CN105954502A CN105954502A CN201610354065.5A CN201610354065A CN105954502A CN 105954502 A CN105954502 A CN 105954502A CN 201610354065 A CN201610354065 A CN 201610354065A CN 105954502 A CN105954502 A CN 105954502A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/46—Wood
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Abstract
The invention provides a radar wave-based nondestructive test method for internal defects of wooden pillars of an antique building. The method comprises the following steps: putting a radar wave-based detection device on an initial detection point of a first unit region, detecting all unit regions in a group upwards one by one from the unit detection region, performing once complete circular scanning during detection of each unit region, recording detection data in real time, gathering all the collected detection data, processing and analyzing, generating internal detection images of the wooden pillars in the detection region of the group, and judging whether the wooden pillars have internal defects or not according to the generated images; if all the unit regions do not have internal defects, directly determining the nature; if the unit regions have internal defects, further judging whether the detected internal defects are completely displayed or not, and performing out-diffusion subsequent detection on the internal defects which are not completely displayed until the internal defects are completely displayed; finally obtaining a qualitative detection result. The method is capable of rapidly and accurately detecting whether defects of holes, purification and the like exist in the wooden pillars of the antique building or not in site and judging the positions and sizes of the defects.
Description
Technical field
The present invention relates to the radar wave lossless detection method of a kind of ancient building pin internal flaw, belong to
Wood Science and Technology field.
Background technology
In wood-structure old building, the safety of overall timber structure is risen to closing weight by the defect condition of load-bearing pin
The effect wanted, load-bearing pin rotten serious time can directly result in caving in of building, to pedestrian and Wen
Thing building brings serious potential safety hazard.And the safety of ancient building pin was generally investigated in the past, mainly
Judged by empirical methods such as range estimation, percussions, in view of mostly the load-bearing pin of wood-structure old building is big
There is paint colour painting on footpath level timber and pin surface more, rely on during the defects such as internal appearance is rotten, empty
Empirical method possibly cannot be discovered in time, it is difficult to decision structure overall security.To this end, exploitation profit
Have great importance by new ancient building pin Inner Defect Testing method, make a general survey of current ancient building
The lossless detection method of pin internal flaw mainly has resistance dynamometer and measure on stress pulse method, and resistance dynamometer is examined
Form, at wood component inside, the passage that diameter is about 3mm, at wood piece table during measure on stress pulse during survey
Face forms the hole of diameter about 4mm, and both the above method belongs to the Non-Destructive Testing safety to timber structure
Impact can not resulted in, but for the particularity of part ancient building, also the most non-in the urgent need to one
The lossless detection method of intrusive mood.
Summary of the invention
It is an object of the invention to provide the radar wave Non-Destructive Testing side of a kind of ancient building pin internal flaw
Method, the scene that is possible not only to detects whether there is cavity, rotten etc. in ancient building pin rapidly and accurately
Defect, and can determine that position and the size of defect empty, rotten, thus be wood-structure old building
Protection provide data supporting.
For achieving the above object, the present invention takes following design:
The radar wave lossless detection method of a kind of ancient building pin internal flaw, has a radar wave inspection
Survey device, emitting radar waves device and radar wave receptor are positioned on radar wave detection device, and
The two is made to be positioned on upper and lower same vertical line；One group of detection region is set for pin to be detected,
The detection of this group at least includes a unit area in region；Its concrete grammar is as follows:
1) radar wave detects device to be placed on the initial test point of first unit area, by this unit
Each unit region in this group is detected by detection region the most one by one, and in each unit area
During detection, need at least complete a full circumferences and scan:
A) when carrying out the detection of each unit area, the first initial inspection of this unit area of labelling
Measuring point also records the orientation of this initial test point, fits on pin by described radar wave detection device,
Start to promote this radar wave detection device at the uniform velocity around pin one week from the initial test point of labelling, until
Return to each test point is scanned by the initial test point of this unit area, and movement one by one detection,
And recording detection data；
B), after completing the detection of a unit area, radar wave is detected device and moves on to next to be checked
The unit area surveyed, the detection process next round of repeat the above steps a；
2) gathering the whole data that detect collected, and process and analyze, generating pin should
The inside detection image in group detection region；
3) judge whether pin exists internal lacking in this group detection region according to the detection image generated
Fall into:
As the most there is not internal flaw in all of unit area, the most directly go to below step 4；
There is internal flaw if any in more than one unit area, then determine whether to have detected that
Pin internal flaw be shown that no completely: as complete in all shown, then continue below step
4；Incomplete if any display, then the unit area to the internal flaw place of these imperfect displays
Carry out extending out continuous inspection, until this internal flaw shows completely, carry out next step；
4) qualitative detection result is made.
The radar wave lossless detection method step 3 of described ancient building pin internal flaw) in, generate
Detection image in judge that pin exists the standard of internal flaw and is: an at least unit area
Detection image exists abnormal, and the edge of this abnormal area is irregularly shaped.
The radar wave lossless detection method step 3 of described ancient building pin internal flaw) in extend out
Continuous inspection is the most some adjacent units region, unit area for described internal flaw place
Proceeding detection, until having in a unit area detection image, exception no longer occurring.
The radar wave lossless detection method step 4 of described ancient building pin internal flaw) determining of obtaining
In property testing result: as pin there are internal flaw, then show or export the number of internal defects
Amount, size, position and the space scale of construction.
The radar wave lossless detection method step 1 of described ancient building pin internal flaw is carried out each
During the detection of unit area, set a test point every 5mm, allow radar wave detection device at this unit
In the surface moving process of region pin, often arrive a test point and then gather 1 group of data.
In the radar wave lossless detection method of described ancient building pin internal flaw, pin to be measured is entered
Before row defect dipoles, the abnormal area true and false the to be carried out judgement that image occurs is detected for display,
It is the image of split post with eliminating.
In the radar wave lossless detection method of described ancient building pin internal flaw, carry out ancient building wood
During the Site Detection of post internal flaw, the first bottom at ancient building pin sets one group of detection zone
Territory, as judged zero defect, then detection of end；As defective in judged, then continue up to set another
Group detection region, so circulates, until no longer finding defect, showing or exporting this ancient building pin
The quantity of internal flaw, size, position and the space scale of construction.
The detection object wood of the radar wave lossless detection method of ancient building pin internal flaw of the present invention
Material is a kind of heterogeneous material and it outside holds layer with having more after making pin, invades if requirement is the most non-
Entering formula Non-Destructive Testing is that conventional detection method is difficult to realize.The inventive method is in detection defect simultaneously
Can further discriminate between and qualitative deficiency, according to the feature of defects various in timber, by analyzing radar
Wave reflection situation is to the existence of defect and type, and the position of defect and size judge.
The present invention can also effectively analyze the spy of various defects in timber while detection defect
Point, to distinguish the defect not needing to process.
The present invention has many places different than some prior aries: first timber is heterogeneous material；Its
The radar wave Non-Destructive Testing patent of secondary armoured concrete slab simply detects existence and the position of reinforcing bar,
And this patent can further discriminate between and qualitative deficiency in detection defect simultaneously, lack according to various in timber
The feature fallen into, by analyzing reflection of radar wave image to the existence of defect and type, and defect
Position and size judge.Both have bigger difference.
It is an advantage of the current invention that: (1) carries out Site Detection to ancient building pin, historical relic can be kept existing
Shape；(2) ancient building pin is carried out the Non-Destructive Testing of complete non-intrusion type, does not interferes with its structure peace
Entirely；(3) ancient building pin interior void, the quantity of defect such as rotten, position and big can quantitatively be shown
Little, the protection for wood-structure old building provides reliable data supporting.
Accompanying drawing explanation
Fig. 1 is the radar in the radar wave lossless detection method of ancient building pin internal flaw of the present invention
Ripple Cleaning Principle schematic diagram.
Fig. 2 is judgement effect schematic diagram (the ancient building pin inspection of defect in radar wave of the present invention detection
Survey the some region of detection in region image, it is determined that for existing defects).
Fig. 3 is judgement effect schematic diagram (the ancient building pin inspection of defect in radar wave of the present invention detection
Survey the some region of detection in region image, it is determined that for split post, be not belonging to defect).
Detailed description of the invention
Refering to shown in Fig. 1, the radar wave lossless detection method of ancient building pin internal flaw of the present invention
In the radar wave detection device selected, emitting radar waves device and receptor be placed on this detection device,
Descend and be positioned on a vertical line, during detection, radar wave being detected device and fits in pin table
Face, promote its radar wave detection device at the uniform velocity around this pin one week (set radar wave detect device around
The detection region that pin is covered for one week is a unit area) and complete on this circumference circle each simultaneously
The data acquisition of collection point, then move up the detection carrying out next circle (next unit region),
Circulation is repeated up to need the region of detection to be fully completed detection, by reflection of radar wave situation analysis,
The detection image covering detection region can be formed, inside preliminary judgement historic building fire prevention be accordingly
No existing defects, the existence position of defect and size.
Below in conjunction with the accompanying drawings and the present invention is described in further details by specific embodiment.
Embodiment 1---being about 600 millimeters of A pins with diameter in certain wood-structure old building of China is
Experiment detection object
The first step: the region that selected A pin is to be detected, budget comprises 5 unit areas, vertical
Marker detection starting point (being located in the first module region of bottom) on post, and record orientation；
Second step: measure pin diameter, opens radar the cannot-harm-detection device and sets according to pin diameter
Put the radar wave detection degree of depth；
3rd step: pin surface of radar wave the cannot-harm-detection device being fitted, opens from the starting point of labelling
Begin to promote radar the cannot-harm-detection device, make radar wave detection device at the uniform velocity and parallel transporting around this pin
OK, and calmly it is spaced (in the surface moving process of pin, gathering 1 group of data point every 5mm) to adopt
Collection detection data；
4th step: complete to return to starting point, upper shifting after pin runs one week, goes to next single
The starting point in unit region continues the detection in next unit region；
5th step: repeat the 3rd step and the 4th step, until having surveyed 5 unit areas；
6th step: the comprehensively analysis result of each data point, can obtain A pin each unit region
Internal image (see Fig. 2, for detection corresponding to a unit area in A pin detection region
Image)；
7th step: gather all of detection image and be analyzed judging, it is found that at A pin
, there is color deeper in, the centre of multiple or whole unit areas in detection region
Region and edge be irregularly shaped (as shown in Figure 2), thus judge that A pin exists internal
Defect, the size and location of its horizontal area is also the most visible；
8th step: judge whether the most completely to embody this internal flaw, as being revealed as internal flaw
The detection image of a upper and lower unit area in region the most no longer has to show and is judged to internal flaw
Image, then detection of end, perform next step；If the region being revealed as internal flaw upper and lower is single
Unit region detection image at least one layer manifest the image having internal flaw, then continue by this layer
Extend out one or multicell area continue detection, until no longer showing the image being judged to internal flaw
Till, perform next step；
9th step: make qualitative detection result；
Tenth step: continue to select region of other detection of A pin according to demand, repeat above-mentioned the
One step, to the step of the 9th step, until the region of detection is completely covered A pin, i.e. can get pin
Defect size at differing heights and position；
11st step: pin defect at differing heights is comprehensively analyzed, is aligned
The size of defect, position and the space scale of construction in true pin.
Embodiment 2---being about 600 millimeters of B pins with diameter in certain wood-structure old building of China is
Experiment detection object
The first step: the region that selected B pin is to be detected, budget comprises 8 unit areas, vertical
Marker detection starting point (being located in the first module region of bottom) on post, and record orientation；
Second step: measure pin diameter, opens radar the cannot-harm-detection device and sets according to pin diameter
Put the radar wave detection degree of depth；
3rd step: radar wave is detected device laminating pin surface, starts to push away from the starting point of labelling
Dynamic radar the cannot-harm-detection device, makes radar wave detection device at the uniform velocity and parallel running around this pin,
And determine interval (gathering 1 group of data point every 5mm in the surface moving process of pin) collection inspection
Survey data；
4th step: complete to return to starting point, upper shifting after pin runs one week, goes to next single
The starting point in unit region continues the detection in next unit region；
5th step: repeat the 3rd step and the 4th step, until having surveyed 8 unit areas；
6th step: the comprehensively analysis result of each data point, can obtain B pin each unit region
Internal image (see Fig. 3, for detection corresponding to a unit area in B pin detection region
Image)；
7th step: gather all of detection image and be analyzed judging, by figure it is found that at B
, there is the relatively deep region that area is bigger simultaneously of a color, because of this regional edge in the centre of pin
Edge is obvious similar round, split post (splicing of the pin) feature similarity common with ancient building,
Thus judge that B pin is split pin and non-defective；
8th step: region of other detection of continuation selection pin according to demand, repeat the above steps,
I.e. can detect that the most whether pin has defect.Finally, comprehensively analyze, obtain relatively accurate
Judged result.
In the method for the various embodiments described above, the detection image of diagram can be passed through manual type or meter
The intelligent processing method of calculation machine is analyzed judging, it can be achieved by the prior art, not go to live in the household of one's in-laws on getting married
State.
The various embodiments described above can be therefore above in the most some changes
Illustrate to be comprised and the structure shown in accompanying drawing should be regarded as exemplary, and it is special to be not used to limit the application
The protection domain of profit.
Claims (7)
1. a radar wave lossless detection method for ancient building pin internal flaw, has a radar wave inspection
Survey device, emitting radar waves device and radar wave receptor are positioned on radar wave detection device, and make
The two is positioned on upper and lower same vertical line；One group of detection region is set for pin to be detected, should
Group detection at least includes a unit area in region；It is characterized in that concrete grammar is as follows:
1) radar wave detects device to be placed on the initial test point of first unit area, this unit examine
Survey region the most one by one each unit region in this group to be detected, and detect in each unit area
Time, a full circumferences need to be completed and scan:
A) when carrying out the detection of each unit area, the first initial detection of this unit area of labelling
Put and record the orientation of this initial test point, described radar wave detection device is fitted on pin, from
The initial test point of labelling starts to promote this radar wave detection device at the uniform velocity around pin one week, until returning to
Each test point is scanned detection by the initial test point of this unit area, and movement one by one, and remembers
Record detection data；
B), after completing the detection of a unit area, radar wave is detected device and moves on to next to be detected
The initial test point of unit area, the detection process of repeat the above steps a, until completing to examine this group
Survey the detection in region；
2) gather the whole data that detect collected, and process and analyze, generate this group of pin
The inside detection image in detection region；
3) judge whether pin exists internal lacking in this group detection region according to the detection image generated
Fall into:
As the most there is not internal flaw in all of unit area, the most directly go to below step 4)；
There is internal flaw if any in more than one unit area, then determine whether to have detected that
Pin internal flaw be shown that no completely: as complete in all shown, then continue below step 4；As
There is display incomplete, then outside the unit area to the internal flaw place of these imperfect displays is carried out
Expand continuous inspection, until this internal flaw shows completely, carry out next step；
4) qualitative detection result is made.
Method the most according to claim 1, it is characterised in that described step 3) in, the inspection of generation
Altimetric image judging, pin exists the standard of internal flaw and is: at least detection figure of a unit area
Exist abnormal in Xiang, and the edge of this abnormal area is irregularly shaped.
Method the most according to claim 1, it is characterised in that described step 3) in extend out continuous inspection
Be the most some adjacent units region, unit area for described internal flaw place continue into
, no longer there is exception until having in a unit area detection image in row detection.
Method the most according to claim 1, it is characterised in that described step 4) the qualitative inspection that obtains
Survey in result: as pin there are internal flaw, then show or export the quantity, greatly of internal defects
Little, position and the space scale of construction.
Method the most according to claim 1, it is characterised in that carry out each list in described step 1
Unit region detection time, set a test point every 5mm, allow radar wave detection device in this unit area
In the surface moving process of pin, often arrive a test point and then gather 1 group of data.
Method the most according to claim 1, it is characterised in that: pin to be measured is carried out defect and sentences
Before Duan, the abnormal area true and false the to be carried out judgement that image occurs is detected for display, be to spell to get rid of
The image of zygostyle.
Method the most according to claim 1, it is characterised in that: carry out ancient building pin internal scarce
During the Site Detection fallen into, the first bottom at ancient building pin sets one group of detection region, as judged
Zero defect, then detection of end；As defective in judged, then continue up to set another group of detection region,
So circulation, until no longer finding defect, show or export this ancient building pin internal flaw quantity,
Size, position and the space scale of construction.
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| CN109213150A (en) * | 2018-08-01 | 2019-01-15 | 东北林业大学 | A kind of antenna control platform of trees defect nondestructive detection system |
| CN110988872A (en) * | 2019-12-25 | 2020-04-10 | 中南大学 | Method for rapidly identifying health state of wall body detected by unmanned aerial vehicle-mounted through-wall radar |
| CN112684433A (en) * | 2020-03-13 | 2021-04-20 | 中国林业科学研究院木材工业研究所 | Correction method for radar imaging of internal hole of wooden column of historic building |
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| Publication number | Publication date |
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| CN105954502B (en) | 2018-10-23 |
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