Global Patent Index - EP 0886759 A4

EP 0886759 A4 2000-11-22 - COMPTON BACKSCATTER PIPE WALL THICKNESS GAUGE EMPLOYING FOCUSING COLLIMATOR AND ANNULAR DETECTOR

Title (en)

COMPTON BACKSCATTER PIPE WALL THICKNESS GAUGE EMPLOYING FOCUSING COLLIMATOR AND ANNULAR DETECTOR

Title (de)

COMPTON-RÜCKSTREUUNGS-WANDDICKENMESSER MIT FOKUSSIERKOLLIMATOR UND RINGFÖRMIGEM DETEKTOR

Title (fr)

JAUGE D'EPAISSEUR DE PAROI DE TUYAU A RETRODIFFUSION COMPTON EMPLOYANT UN COLLIMATEUR A CONCENTRATION ET UN DETECTEUR ANNULAIRE

Publication

EP 0886759 A4 (EN)

Application

EP 97908911 A

Priority

  • US 9703516 W
  • US 1275596 P

Abstract (en)

[origin: WO9733141A1] This invention is directed toward the measure of the thickness of material using nuclear techniques. More particularly, the invention is directed toward apparatus and methods for measuring the thickness of pipe wall, from the outside of the pipe (70), using an annular detector (50), concentric conical detector collimation (26), and backscatter gamma radiation. A source of gamma radiation (14), preferably at energy 279 keV from mercury-203, is collimated into a pencil beam and impinged perpendicularly upon the outside of the pipe wall to be measured. Compton backscatter radiation from the pipe wall is then measured with an annular, concentric photon detector which preferably comprises a scintillation crystal, such as sodium iodide, optically coupled to a single photomultiplier tube. Pipe thickness is determined from detector response using a predetermined relationship obtained during system calibration. Conical, concentric detector collimation is used to obtain accurate and precise measurements when the pipe is filled with liquid.

IPC 1-7 (main, further and additional classification)

G01B 15/02

IPC 8 full level (invention and additional information)

G01B 15/02 (2006.01)

CPC (invention and additional information)

G01B 15/02 (2013.01); G21K 1/025 (2013.01)

Citation (search report)

Designated contracting state (EPC)

BE DE ES FR GB IT NL SE

EPO simple patent family

WO 9733141 A1 19970912; AU 2070397 A 19970922; CA 2248145 A1 19970912; EP 0886759 A1 19981230; EP 0886759 A4 20001122

INPADOC legal status


2003-09-17 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20030304

2001-10-31 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20010914

2000-11-22 [A4] SUPPLEMENTARY SEARCH REPORT

- Effective date: 20001006

2000-11-22 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A4

- Designated State(s): BE DE ES FR GB IT NL SE

1998-12-30 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19981005

1998-12-30 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): BE DE ES FR GB IT NL SE