JPS57161504A - Measuring device for thickness of pipe - Google Patents
Measuring device for thickness of pipeInfo
- Publication number
- JPS57161504A JPS57161504A JP4648481A JP4648481A JPS57161504A JP S57161504 A JPS57161504 A JP S57161504A JP 4648481 A JP4648481 A JP 4648481A JP 4648481 A JP4648481 A JP 4648481A JP S57161504 A JPS57161504 A JP S57161504A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- thetaa
- deltar
- transmission
- axis
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
- G01B15/02—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring thickness
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Length-Measuring Devices Using Wave Or Particle Radiation (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
PURPOSE:To make the sure calculation of wall thickness distributions possible in the measurement of the thickness of a pipe by determining the rate of eccentricity of an inside diameter from the transmission intensity of radiations and the outside diameter in the transmission direction. CONSTITUTION:A radiation of intensity I0 assuming an angle theta to a Y-axis by passing through a central point O on the outside circumference of a pipe is considered, and distance OA=R1, OA'=R2 are assumed. The inside circumference of the pipe is a circle of a radius (r), and the center thereof is apart by deltar from the X-axis, and deviates by thetaA from the Y-axis. If the transmission intensity I is measured, a coefft. of transmission K is determined from the coeff. of attenuation in metal and the IO. From this and the outside diameter D in the direction theta, K'=(D-K)<2>/4 is operated. On the other hand, as is evident from the theoretical equation K'=r<2>-deltar<2>.sin<2>(theta-thetaA), eccentricity exists if the measured value K' exhibits periodical fluctuations. The square root of the difference between the max. and min. values of the K' is the magnitude deltar of the eccentricity and the direction where it maximizes is thetaA. Thereby, the wall thickness distributions are calculated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4648481A JPS57161504A (en) | 1981-03-31 | 1981-03-31 | Measuring device for thickness of pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4648481A JPS57161504A (en) | 1981-03-31 | 1981-03-31 | Measuring device for thickness of pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57161504A true JPS57161504A (en) | 1982-10-05 |
| JPS632325B2 JPS632325B2 (en) | 1988-01-18 |
Family
ID=12748476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4648481A Granted JPS57161504A (en) | 1981-03-31 | 1981-03-31 | Measuring device for thickness of pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57161504A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5247980A (en) * | 1985-08-19 | 1993-09-28 | Okamoto Industries, Inc. | Anti-skid net body attachment for an automobile tire |
| JP2008076074A (en) * | 2006-09-19 | 2008-04-03 | Hitachi Engineering & Services Co Ltd | Method for inspecting surface rust of cylindrical member with its surface coated and device therefor |
| JP2008076072A (en) * | 2006-09-19 | 2008-04-03 | Hitachi Engineering & Services Co Ltd | Method for inspecting surface rust of cylindrical member with its surface coated and device therefor |
| JP2011501191A (en) * | 2007-10-25 | 2011-01-06 | ゼネラル・エレクトリック・カンパニイ | System and method for measuring mounting dimensions of a flow measurement system |
-
1981
- 1981-03-31 JP JP4648481A patent/JPS57161504A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5247980A (en) * | 1985-08-19 | 1993-09-28 | Okamoto Industries, Inc. | Anti-skid net body attachment for an automobile tire |
| US5343610A (en) * | 1985-08-19 | 1994-09-06 | Okamoto Industries, Inc. | Method of making an anti-skid apparatus for an automobile tire |
| JP2008076074A (en) * | 2006-09-19 | 2008-04-03 | Hitachi Engineering & Services Co Ltd | Method for inspecting surface rust of cylindrical member with its surface coated and device therefor |
| JP2008076072A (en) * | 2006-09-19 | 2008-04-03 | Hitachi Engineering & Services Co Ltd | Method for inspecting surface rust of cylindrical member with its surface coated and device therefor |
| JP2011501191A (en) * | 2007-10-25 | 2011-01-06 | ゼネラル・エレクトリック・カンパニイ | System and method for measuring mounting dimensions of a flow measurement system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS632325B2 (en) | 1988-01-18 |
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