JPH049606A - Method for measuring corroded state of inside of piping based upon radiograph - Google Patents
Method for measuring corroded state of inside of piping based upon radiographInfo
- Publication number
- JPH049606A JPH049606A JP11124190A JP11124190A JPH049606A JP H049606 A JPH049606 A JP H049606A JP 11124190 A JP11124190 A JP 11124190A JP 11124190 A JP11124190 A JP 11124190A JP H049606 A JPH049606 A JP H049606A
- Authority
- JP
- Japan
- Prior art keywords
- radiographic
- piping
- measuring
- photograph
- corroded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000007797 corrosion Effects 0.000 claims abstract description 19
- 238000005260 corrosion Methods 0.000 claims abstract description 19
- 230000005855 radiation Effects 0.000 claims description 9
- 230000000536 complexating effect Effects 0.000 abstract 1
- 230000001066 destructive effect Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 15
- 239000010959 steel Substances 0.000 description 15
- 238000010586 diagram Methods 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- GUTLYIVDDKVIGB-OUBTZVSYSA-N Cobalt-60 Chemical compound [60Co] GUTLYIVDDKVIGB-OUBTZVSYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000941 radioactive substance Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Length-Measuring Devices Using Wave Or Particle Radiation (AREA)
- Radiography Using Non-Light Waves (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は配管の内部状況を調べるために、少なくとも交
わる２方向から放射線透過試験を行い、得られた放射線
透過写真を画像処理することによって、上記配管の内面
を観察する放射線透過写真による配管の内面腐食状況の
測定方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention performs a radiographic test from at least two intersecting directions in order to investigate the internal condition of piping, and performs image processing on the obtained radiographic photograph. The present invention relates to a method for measuring the internal corrosion state of a pipe using a radiographic radiograph for observing the inner surface of the pipe.
水道、ガス等の設備における配管の内部状況を調べる場
合、配管の接続部を外して目視あるいはファイバースコ
ープ等を利用した目視検査による方法があった。When investigating the internal condition of piping in water, gas, and other facilities, there are methods to remove the connections of the piping and visually inspect it, or to visually inspect it using a fiberscope or the like.
また、Ｘ線透過写真を行い、得られた写真の濃淡から腐
食した部分を推定することも行われていた。In addition, an X-ray photograph was taken and the corroded portion was estimated from the shading of the photograph.
しかしながら、上記のようなファイバースコープ等を利
用して目視検査する場合には、配管設備の稼動を一時停
止させ、かつ接続部も脱着しなければならないという不
便があり、稼働中の配管の検査には不向きであるという
問題点があった。However, when visually inspecting using a fiberscope as described above, there is an inconvenience in that the operation of the piping equipment must be temporarily stopped and the connections must be removed, making it difficult to inspect piping while it is in operation. The problem was that it was unsuitable.
また、放射線透過試験を適用した配管の内部状況の検査
においては、一方向のみからニア重璧措影Ｕまた一枚の
放射線透過写真であったため、腐食状況を的蒔に推定す
るごとは困胃であった。In addition, when inspecting the internal condition of piping using a radiographic test, it was difficult to extrapolate the state of corrosion as it was a near-grain photograph taken from only one direction and a single radiographic photograph. Met.
本発明はこのような事情にｍ １７７てなされたもので
、配管設備におりる配管の内面腐食の進展状況が容易に
把握できる配管の内面腐食状況の測定力法を提供するこ
とを目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a force method for measuring the internal corrosion status of piping, which allows the progress status of internal corrosion of piping leading to piping equipment to be easily grasped. .
Ｃ！！題を解決するための手段］
上記目的に沿・う本発明に係る請球の範囲第１項記載の
放射線透過写真による配管の内面腐食状況の測定力法は
、測定しようとする配管に少なくとも交わる２方向から
放射線を透過して該配管の放射線透過写真を撮影し７、
しかる後該邊影された写真を画像入力装置にて各点の濃
度の階調値を検出し、該階調値と基準値を比較し、て腐
食部を検出し、該腐食部の上記それぞれの写真における
位置及び該写真の撮影角度から上記ａｍ部の断面形状を
表示するように構成されている。C! ! Means for Solving the Problem] The force method for measuring the internal corrosion state of piping using a radiographic photograph according to the scope of the present invention according to the above-mentioned object, according to Taking a radiographic photograph of the piping by transmitting radiation from two directions7,
After that, the gradation value of the density at each point is detected using an image input device from the photograph taken from the side, and the gradation value is compared with a reference value to detect a corroded area, and each of the above-mentioned areas of the corroded area is detected. It is configured to display the cross-sectional shape of the am section from the position in the photograph and the photographing angle of the photograph.
請求の範囲第２項記載の放射線透過写真による配管の内
面腐食状況の測定力法は、請求項第１項記載の放射線透
過゛シ３：真Ｃ：よる配管の内面腐食状況の測定力法に
おい６放射線透過写真は少なくとも略直交獲る２方向か
ら撮影されるよ・）に構成されている。The force method for measuring the internal corrosion state of piping using a radiographic photograph according to claim 2 is the same as the force method for measuring the internal corrosion state of piping using radiographic photograph 3: true C: according to claim 1. 6 Radiographs are constructed in such a way that they are taken from at least two substantially orthogonal directions.
なお１、ここで放射線２−はＸ線の他、放射性物質（コ
バルト６０等）から発生ずる放射線も含む。1. Here, the radiation 2- includes not only X-rays but also radiation generated from radioactive substances (such as cobalt-60).
また、上記基＊ａとは、別に用意された腐食部のない同
〜形状の配管であっても良いシ１５．予め過去の実績に
基づき蓄積された管の各（３′７置に対応す゛る階！ｊ
ｌ値データーであ、っても良い。In addition, the above group *a may be a separately prepared pipe having the same shape or shape without a corroded part.15. Each of the pipes (floors corresponding to 3'7) accumulated in advance based on past results!
It may be l value data.
次に、請求項第１項及び第２項記載の放射線透過写真に
よる配管の内面腐食状況の測定方法の作用を第１図を参
照しながら説明する。Next, the operation of the method for measuring the internal corrosion state of piping using a radiographic radiograph according to claims 1 and 2 will be explained with reference to FIG.
まず、少なくとも交わる２方向（図においては直交する
方向）ａ、ｈから配管１０に放射線を透過させて放射線
透過写真１１．１２を撮影する。First, radiographic photographs 11 and 12 are taken by transmitting radiation through the pipe 10 from at least two intersecting directions (orthogonal directions in the figure) a and h.
これによって、配管１０の内部に腐食部１５がある場合
には、上記放射線透過写真１１．１２の濃度に変化を生
して腐食部に対応する下がった部分１３．１４が撮影さ
れる。As a result, if there is a corroded part 15 inside the pipe 10, the density of the radiographic photograph 11.12 changes and a lowered part 13.14 corresponding to the corroded part is photographed.
次に該放射線透過写真１１．１２を少なくとも２方向か
らその位置を確定することができ、逆に少なくとも交わ
る２方向から腐食部の位置が確定できれば、測定しよう
とする配管のどの位置に腐食部が存在するか決定できる
。Next, if the position of the radiographic photograph 11.12 can be determined from at least two directions, and conversely, the position of the corroded part can be determined from at least two intersecting directions, then in which position of the pipe to be measured is the corroded part located? You can determine whether it exists.
次に、上記放射線透過写真を画像入力装置によ、って取
込み、各点の濃度信号である階調値が得られるので、第
１図に放射線透過写真１１．１２を横軸として、縦軸方
向に記載している。Next, the above-mentioned radiographic photograph is taken in by an image input device, and the gradation value which is the density signal of each point is obtained. It is written in the direction.
しかしながら、腐食部の無い配管の場合縦方向の厚みは
種々の部分で変わるので、その階調値は両側に立ち」、
がり、中央に窪む形状となるので、予め測定するか、あ
るいは算出して基準値を求め、測定値と比較し７、下が
った部分１３．１４が腐食部１５に相当する。However, in the case of piping without corroded parts, the vertical thickness changes in various parts, so the gradation value stands on both sides.
Since the shape is concave in the center, it is measured in advance or calculated to obtain a reference value, and compared with the measured value 7. The lowered portions 13 and 14 correspond to the corroded portion 15.
そこで、この腐食部１５の放射線透過写真１１．１２の
それぞれの位置、厚み及び、該放射線透過写真１１．１
２の撮影角度から該腐食部の断面形状を作図し２で表示
する。Therefore, the position and thickness of each radiographic photograph 11.12 of this corroded part 15, and the radiographic photograph 11.1
The cross-sectional shape of the corroded portion is plotted from the photographing angle 2 and is displayed as 2.
［実験例］
続いて、本発明の作用、効果を確認するために行った実
験例につき説明し、本発明の理解に供づる。[Experimental Example] Next, an experimental example conducted to confirm the action and effect of the present invention will be explained to provide an understanding of the present invention.
まず本実験に使用しまた装置１６は、装置本体を構成す
るマイクロコンピュータ１７と、装置本体１７に接続さ
れる画像デイスプレィ１８、キーボード１９、タブレッ
ト２０、カメラ用モニタ２１、画像入力装置の一例であ
るＣＣＤカメラ２２で構成され、シャーカステン２３に
セットされたフィルムの白黒画像をＣＣＤカメラ２２か
ら取り込みマイクロコンピュータ１７によってその濃度
が階ｔＪｉＩ値とし、て処理される。First, the device 16 used in this experiment includes a microcomputer 17 constituting the device body, an image display 18, a keyboard 19, a tablet 20, a camera monitor 21, and an image input device connected to the device body 17. It is composed of a CCD camera 22, and a black-and-white image of a film set on a Scherkasten 23 is taken in from the CCD camera 22, and the density thereof is processed by a microcomputer 17 as a tJiI value.
次に、第３図に丞すように、内面に減肉部２５．２６を
施した鋼管試験片２７と図示していない健全な鋼管試験
片を並接して直行するＸ方向及びＹ方向からＸ線を透過
して撮影したフィルム２Ｂ、２９をそれぞれ第４図（Ａ
）および第５図（Ａ）に示す、なお、これらのフィルム
２８．２９の解析においでは、ＣＣＤカメラ２２がら入
力された映像信号は、ＡＤ変換されて濃度分布が２Ｆ）
６段階の階調値データに１き換えられる。このとき鋼管
の端部から端部までを４００分割するように！！！！ｌ
ｌ像の大きさを調整Ｌ７“ている。Next, as illustrated in FIG. Films 2B and 29 photographed through the line are shown in Figure 4 (A
) and FIG. 5(A). In the analysis of these films 28 and 29, the video signal input from the CCD camera 22 is AD converted and the density distribution is 2F)
It is replaced by 1 to 6 levels of gradation value data. At this time, divide the steel pipe into 400 parts from end to end! ! ! ! l
The size of the l image is adjusted L7''.
この様子を第４図（Ｂ） 、（Ｃ）及び第５関（Ｂ）、
（Ｃ） ニ示すが、第４図（Ｂｌｌ及び（Ｃ）は第４図
（Ａ）における走査線Ｃ及びｄを、第５図（Ｂ）及び（
Ｃ）は第５図（Ａ）における走査線ｅ及びｆの階調値デ
ーターの概略を示す。This situation is shown in Figures 4 (B), (C) and 5th section (B).
(C) D shows the scanning lines C and d in FIG. 4(A), but FIG.
C) schematically shows the gradation value data of scanning lines e and f in FIG. 5(A).
従って、第４図において健全な鋼管の基準値となる階調
値データー３０と測定階調値データー・３１の各点を比
較して、各点の基準値より測定階調値の方が小さい場合
には、腐食部と判断し、基準値と測定階調値の差から腐
食深さを判定し、その位置をＸ座標値として取り込む。Therefore, in Fig. 4, when comparing each point of gradation value data 30, which is the reference value of a healthy steel pipe, and measured gradation value data 31, if the measured gradation value is smaller than the reference value of each point. In this case, it is determined that it is a corroded part, the corrosion depth is determined from the difference between the reference value and the measured gradation value, and the position is taken in as the X coordinate value.
次に、第５図において、（Ｂ）に示す健全な鋼管の基ｌ
＄値となる階調値データー３２と、（Ｃ）に示す測定階
調値データー３３の差を比較し１、上記と同様な処置に
よゲこ腐食部のＹ座標値を取り込むそして、鋼管が断面
円形ごあることからこれらのデータ・−から断面円形の
配置に腐食部の厚みを加味し、第３図ζこ示虹ＪうＵ実
際のｊＡ′験ノ１を処理し７、画像において適当な端面
処理を施すと略第３図に示づような断面形状の解析画像
が得られた。Next, in Fig. 5, the base l of the sound steel pipe shown in (B) is
Compare the difference between the gradation value data 32 that is the $ value and the measured gradation value data 33 shown in (C) 1. Take the Y coordinate value of the corroded part by the same procedure as above. Since the cross section is circular, we added the thickness of the corroded part to the arrangement of the circular cross section from these data and processed the actual experiment No. 1 in Fig. When the end face treatment was performed, an analytical image having a cross-sectional shape approximately as shown in FIG. 3 was obtained.
なお２上記実験例においては、上記装置１６で、各点に
おける鋼管試験片２７の階調値デ・−タ♂。2. In the above experimental example, the apparatus 16 collects gradation value data of the steel pipe test piece 27 at each point.
対応する基準となる鋼管のｐｋ調価値データ比較するこ
とによって鋼管試験片２■の欠陥部を検出（７たが、対
応する基準値の階調データのかわりに前もって基準値を
画像処理機に入力しておき、該基準値と鋼管試験片２７
の階調データを比較することによって画像処理すること
も可能である。この場合、放射線透過写真の全体的濃度
が多少ことなるので、全体的８１度を調整するデーター
を測定する配管から読み取り、核濃度基準値を」二記測
定階調値に加えるようにすることも可能である。Defects in steel pipe test piece 2 are detected by comparing pk tone value data of steel pipes that serve as corresponding standards (7) However, instead of the gradation data of the corresponding standard values, the standard values are input into the image processing machine in advance. Then, the reference value and steel pipe test piece 27
It is also possible to perform image processing by comparing the gradation data of the images. In this case, since the overall density of the radiographic image will be slightly different, it is also possible to read the data for adjusting the overall 81 degrees from the measuring pipe and add the nuclear concentration reference value to the measured gradation value. It is possible.
しかしながら、第６図及び第７図に不ずような腐食部３
４．３５を持つ鋼管３６を第６図に示す方向からＸ Ｙ
方向の放射線透過写真を撮影した場合には２２枚の写真
でその断面形状を再現す−ることが可能であるが、第７
図に示すよ・うな角度で放射線透過写真を撮影して、該
撮影した２枚の写真から断面形状を再現すると、第８図
に示す通りになり、実際とは異なる断面３７が表示され
る。However, the corroded area 3 as seen in Figures 6 and 7
4.35 from the direction shown in Fig. 6
When radiographic photographs are taken in the same direction, it is possible to reproduce the cross-sectional shape with 22 photographs, but the 7th
If a radiographic photograph is taken at the angle shown in the figure and the cross-sectional shape is reproduced from the two taken photographs, the cross-sectional shape will be as shown in FIG. 8, and a cross-section 37 different from the actual one will be displayed.
つまり、この場合には鋼管の断面形状図をより正確に画
像デイスプレィＩＢ上に表示するには、２枚の放射線透
過写真のみでは情報量が少なく、更に撮影枚数を追加す
る必要がある。That is, in this case, in order to more accurately display the cross-sectional shape diagram of the steel pipe on the image display IB, the amount of information is small with only two radiographic photographs, and it is necessary to take an additional number of photographs.
そこで、第９図に示すように直交するＸ （ｇ）Ｙ（ｈ
）方向の他に４５度の方向ｉから放射線透過写真を撮影
するようにするやこれＣごよって、３枚の放射線透過写
真を得るが、これによって腐食部３４．３５の断面形状
を表示すると第１０図の如くなり、実際の形状に近い断
面形状３８を得ることができる。Therefore, as shown in Fig. 9, orthogonal X(g)Y(h
) In addition to the 45-degree direction i, radiographic photographs are taken from the 45-degree direction i. Accordingly, three radiographic photographs are obtained. As shown in FIG. 10, a cross-sectional shape 38 close to the actual shape can be obtained.
従って、以上の実験から現場において、配管の放射線透
過写Ｘ（Ｘ線あるいはその他の放射線による）を少なく
とも２方向（直交する方向が好まし７い）から行い、該
放射線透過写真をコンピユー・−タに入力して画像、ま
ず撮影写真の濃度である階調値を測定し、該階１１値を
基１１！値と比較１．て腐食部を検出し、次に検出され
た腐食部の写真の平面位置と、撮影角度から実際の測定
配管の断面形状を得ることができることになる
この場合、２方向のみであると情報量が不足する場合が
あるので、３方向場合によってはそれ以１の方向から撮
影するのが好ましい。Therefore, based on the above experiments, radiographic X-ray images of piping (using X-rays or other radiation) are performed on-site from at least two directions (preferably orthogonal directions), and the radiographic images are transferred to a computer. First, measure the gradation value, which is the density of the photographed photograph, and calculate the gradation value based on the 11! Value and comparison 1. In this case, the amount of information is limited if only two directions are taken. Since there may be a shortage, it is preferable to photograph from three directions or, depending on the case, from one direction.
この実験例においこは、放射線透過写真のコンピュータ
の取込みはＣＣＤカメラを使用して行ったが、イメージ
スキャンによって画像を取り込む場合も、本発明は適用
される。In this experimental example, a CCD camera was used to capture the radiographic image using a computer, but the present invention is also applicable to cases where images are captured by image scanning.
また、健全管と比較しながら放射線透過写真を撮影する
場合には、短い健全管を検査しようとする配管の横に並
べて配置し、これらを同時に放射線透過写真を行うこと
によって、フィルム自体の濃度を合わせることができ、
これによって健全管と測定し、ようとする配管の濃度の
階訓イ直から腐食状況を測定ヅ゛ることも可能である。In addition, when taking radiographic photographs while comparing healthy pipes, placing short healthy pipes next to the piping to be inspected and taking radiographic photographs of them at the same time allows you to check the density of the film itself. can be matched,
This makes it possible to determine whether the pipe is healthy and to measure the corrosion status directly from the concentration level of the pipe.
な石、」−１放射線透過１真には′へイルｌ、の場合の
他印画紙に焼いたものを含み、配管は鋼管のみでなく、
他の金属！（アルミ、ステン、銅等）であってもＲい。In addition to the case of ``Hail l'', the piping is not only steel pipes, but also includes those printed on photographic paper.
Other metals! (Aluminum, stainless steel, copper, etc.) is also R.
本発明に係る請求項第１項及び第２項記載の放射線透過
写真による配管の内面腐食状況の測定方法においとは、
少なくとも交わる２方向から放射線を透過して放射線ｉ
！ｉ過ち真を撮影し５、該放射線透過写真を画像人力装
置仁゛入力した後、処理するコ（！： Ｍ ｒ 、’？
： 、 、、、に＝ 記！ｊＡ ｔ ’ｉ’） 内１ｆ
ｌｆ ＷＥ ｊｆＦ、 （７） ａ ７５１ ヲ、−、
−■
元的に、より正確に断面形状として表示するごとが可能
である。したがって、現場において、簡単に放射線透過
写真を取り、これを持ち帰って画像入力装置によって解
析及び作図ができるので、実際に稼働し７ている配管の
腐食状況を簡単に把握できる。In the method for measuring the internal corrosion state of piping using radiographic radiographs according to claims 1 and 2 of the present invention,
Radiation i is transmitted through at least two intersecting directions.
! After photographing the i-error image and inputting the radiographic image into the human-powered image device, it is processed (!: M r ,'?
： 、 、、、に= Note! jA t 'i') within 1f
lf WE jfF, (7) a 751 wo, -,
−■ Basically, it is possible to display the cross-sectional shape more accurately. Therefore, it is possible to easily take a radiographic photograph at the site and take it home for analysis and drawing using an image input device, making it easy to grasp the corrosion status of pipes that are actually in operation.
これによって配管内面の腐食部の指摘が可能となり、稼
働中の配管設備を停止することなく、配管内面の腐食部
を検出し、形状の把握かり能であり、史には、本発明に
よる放射線透過写真４二よる配管の内面腐食状況の測定
力法を適用して配管内面の状況を測定すると共に、配管
内向の経年変化を調査づ−るごとによって、本人災害の
防止が可能である。This makes it possible to point out corroded parts on the inner surface of pipes, and it is possible to detect corroded parts on the inner surface of pipes and understand their shape without stopping the piping equipment in operation. It is possible to prevent personal injury by measuring the condition of the inner surface of the pipe by applying the force method for measuring the corrosion state of the inner surface of the pipe as shown in Photo 42, and by investigating the aging of the inner surface of the pipe.
第１図は本発明の放射線透過ｂ゛真（：：よる配管の内
面腐食状況の測定方法の概略説明図、第２図は本発明の
作用効昧を確認する為に七］、た実験装置の概略構成図
、第３図（Ａ）は実験に使用しまた網管の止血図、第３
〆１（Ｂ）は同断面図５．第４し１及び第、５図はそれ
ぞれ放射線透過ち真とその階調値との関係を示す説明図
、第６図及び第７図は測定鋼管と階調値との関係を示す
説明図、第８図は合成表示された鋼管の断面図、第９図
は鋼管と各撮影位置の階調値の関係を示す説明図、第１
０図は合成表示された鋼管の断面図である。
（符号の説明〕
１０−−−−一配管、１】、１２ −一一一−・放射線
透過写真、１３、ｌ ４−・・ 下がった部分、１５腐
食部、１６−−−−−−装置、ｌ ７−−−−− マイ
クロニ１ンビエータ、１８−−一 画像デスプレイ、１
９キーボード、２０− ・−タブレソ［，２１カメラモ
ニター、２２−−−−ＣＣＤカメラ、２３ ゛−シャカ
ステン、２５．２６−〜−一 減肉部、２７− 鋼管
試験片、２８．２９フイルム、３０〜３３−一階調値デ
ーター、３４．３５− 腐食部、３６−・〜 鋼管、
３７．３８−ｍ−断面形状
第２図Fig. 1 is a schematic explanatory diagram of the method for measuring the internal corrosion status of piping using the radiation transmission system of the present invention, and Fig. 2 is an experimental apparatus for confirming the effectiveness of the present invention. Figure 3 (A) is a schematic configuration diagram of
1(B) is the same cross-sectional view 5. 4, 1, 5, and 5 are explanatory diagrams showing the relationship between the radiation transmission line and its gradation value, respectively, FIGS. 6 and 7 are explanatory diagrams showing the relationship between the measuring steel pipe and the gradation value, Fig. 8 is a cross-sectional view of the compositely displayed steel pipe, Fig. 9 is an explanatory diagram showing the relationship between the steel pipe and the gradation values at each photographing position, and Fig. 1
Figure 0 is a cross-sectional view of a compositely displayed steel pipe. (Explanation of symbols) 10---1 piping, 1], 12 -111-・radiograph, 13, l 4---lowered part, 15 corroded part, 16------ equipment , l 7----- Micronimbiator, 18--1 Image display, 1
9 Keyboard, 20-・-Tabreso[, 21 Camera monitor, 22-- CCD camera, 23 ゛-Shakasten, 25.26---1 Thin thinning part, 27- Steel pipe test piece, 28.29 Film, 30 ~33-One gradation value data, 34.35- Corrosion part, 36-・~ Steel pipe,
37.38-m-Cross section diagram 2
Claims (2)
から放射線を透過して該配管の放射線透過写真を撮影し
、しかる後該撮影された写真を画像入力装置にて各点の
濃度の階調値を検出し、該階調値と基準値を比較して腐
食部を検出し、該腐食部の上記それぞれの写真における
位置及び該写真の撮影角度から上記腐食部の断面形状を
表示することを特徴とする放射線透過写真による配管の
内面腐食状況の測定方法。(1) Take a radiographic photograph of the pipe by transmitting radiation from at least two directions intersecting the pipe to be measured, and then use the image input device to input the density gradation value of each point. , detect a corroded part by comparing the gradation value and a reference value, and display the cross-sectional shape of the corroded part from the position of the corroded part in each of the photographs and the photographing angle of the photograph. A method for measuring the internal corrosion status of piping using radiographic photographs.
から撮影されている請求項第１項記載の放射線透過写真
による配管の内面腐食状況の測定方法。(2) The method for measuring the internal corrosion state of piping using radiographic photographs according to claim 1, wherein the radiographic photographs are taken from at least two substantially orthogonal directions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11124190A JPH049606A (en) | 1990-04-25 | 1990-04-25 | Method for measuring corroded state of inside of piping based upon radiograph |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11124190A JPH049606A (en) | 1990-04-25 | 1990-04-25 | Method for measuring corroded state of inside of piping based upon radiograph |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH049606A true JPH049606A (en) | 1992-01-14 |
Family
ID=14556160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11124190A Pending JPH049606A (en) | 1990-04-25 | 1990-04-25 | Method for measuring corroded state of inside of piping based upon radiograph |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH049606A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019082596A1 (en) | 2017-10-23 | 2019-05-02 | 東レ株式会社 | Inspection method and manufacturing method for molded resin product as well as inspection device and manufacturing device for molded resin product |
| WO2020153063A1 (en) | 2019-01-25 | 2020-07-30 | 東レ株式会社 | Inspection method and manufacturing method for structure and inspection apparatus and manufacturing apparatus for structure |
-
1990
- 1990-04-25 JP JP11124190A patent/JPH049606A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019082596A1 (en) | 2017-10-23 | 2019-05-02 | 東レ株式会社 | Inspection method and manufacturing method for molded resin product as well as inspection device and manufacturing device for molded resin product |
| US11493459B2 (en) | 2017-10-23 | 2022-11-08 | Toray Industries, Inc. | Inspection method and manufacturing method for molded resin product as well as inspection device and manufacturing device for molded resin product |
| WO2020153063A1 (en) | 2019-01-25 | 2020-07-30 | 東レ株式会社 | Inspection method and manufacturing method for structure and inspection apparatus and manufacturing apparatus for structure |
| US11841332B2 (en) | 2019-01-25 | 2023-12-12 | Toray Industries, Inc. | Inspection method and manufacturing method for structure and inspection apparatus and manufacturing apparatus for structure |
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