METHOD AND ARRANGEMENT FOR IMPROVING TOMOGRAPHIC DETERMINATIONS, PARTICULARLY SUITABLE FOR INSPECTION OF STEEL REINFORCEMENT BARS IN CONCRETE STRUCTURES
First Claim
1. A method for improving tomographic determinations for the inspection of steel reinforcements in concrete structures, said method comprising the steps of:
- a) irradiating said structure with penetrating radiation from different positions by means of a radiation source andb) recording said radiation transmitted through said structure for the different positions of the radiation source in recording means;
the method further comprising the steps of;
i. defining and fixing a main coordinate system to the structure under study, to which the results of the analysis will be referred;
ii. providing a reference system with a plurality of independently identified and individualized reference elements made of a high density radiation-absorbent material and contained in a rack, such reference elements being arranged in accurately known positions on a radiation source side and/or a recording means side of said structure in order to record fiducial marks on the recording means;
iii. identifying the above mentioned measurements;
iv. determining irradiation times; and
v. determining the position of the fiducial marks resulting from the reference elements in the racks, and then determining the position of both the radiation source and the recording means with respect to the structure under study, based on the position of such fiducial marks;
vi. determining the position and size of reinforcements within a structure based on information recorded on each of the recording means used for measurement by means of combining the data resulting from the different coordinate systems for each of the recording means in the single main coordinate system fixed to the structure under study.
1 Assignment
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Accused Products
Abstract
A method and arrangement for improving tomographic determinations by means of radiation, specially suitable for steel bars in concrete. The method comprising irradiating said body with penetrating radiation, recording said radiation transmitted through said body in recording means; providing a reference system with a plurality of independently identified and individualized reference elements made of a high density radiation-absorbent material, such reference elements being arranged in an orderly manner; identifying the above mentioned measurements; determining irradiation times; and determining the position and size of objects within a body based on the information recorded on the recording means used for measurement.
11 Citations
21 Claims
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1. A method for improving tomographic determinations for the inspection of steel reinforcements in concrete structures, said method comprising the steps of:
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a) irradiating said structure with penetrating radiation from different positions by means of a radiation source and b) recording said radiation transmitted through said structure for the different positions of the radiation source in recording means; the method further comprising the steps of; i. defining and fixing a main coordinate system to the structure under study, to which the results of the analysis will be referred; ii. providing a reference system with a plurality of independently identified and individualized reference elements made of a high density radiation-absorbent material and contained in a rack, such reference elements being arranged in accurately known positions on a radiation source side and/or a recording means side of said structure in order to record fiducial marks on the recording means; iii. identifying the above mentioned measurements; iv. determining irradiation times; and v. determining the position of the fiducial marks resulting from the reference elements in the racks, and then determining the position of both the radiation source and the recording means with respect to the structure under study, based on the position of such fiducial marks; vi. determining the position and size of reinforcements within a structure based on information recorded on each of the recording means used for measurement by means of combining the data resulting from the different coordinate systems for each of the recording means in the single main coordinate system fixed to the structure under study. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An arrangement for the inspection of steel reinforcements in concrete structures, which arrangement comprises for its application to the study of structures by means of an external source:
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a) a source of radiation capable of penetrating said structure; b) a support for the radiation source immovably attached to the structure being studied; c) recording means to record the transmitted radiation through such structure; d) a reference system with a plurality of reference elements independently identified and individualized, made of a high density material that absorbs radiation, which reference elements are arranged in accurately known positions; e) a first rack located between the source and the structure under study, immovably attached to said structure, which first-rack comprises a reference system according to above paragraph d); f) a second rack immovably attached to said structure, which second rack comprises supports for the recording means and a reference system according to above paragraph d); g) identification means for measurements; and h) means to determine irradiation time comprising a device to remotely and continuously monitor the radiation dose applied to different spots on the recording means surface and determining the irradiation times comprising a rack with multiple radiation-sensitive devices, which device is located behind the recording means. - View Dependent Claims (10, 11, 13, 14, 15, 16, 17, 18, 19)
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9. An arrangement for the inspection of steel reinforcements in concrete structures, which arrangement comprises for its application to the study of structures by means of an internal source:
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a) a source of radiation capable of penetrating said structure; b) a support for the radiation source immovably attached to the structure under study that is suited for using an internal source, that is, when the source is located within a hole drilled into the structure under study; c) recording means to record the transmitted radiation through such structure; d) a reference system with a plurality of reference elements independently identified and individualized, made of a high density material that absorbs radiation, which reference elements are arranged in accurately known positions; e) a rack immovably attached to said structure, which rack comprises supports for the radiation recording means and a reference system according to above paragraph d); f) identification means for measurements; and g) means to determine irradiation time comprising a device to remotely and continuously monitor the radiation dose applied to different spots on the recording means surface and determining the irradiation times comprising a rack with multiple radiation-sensitive devices, which device is located behind the recording means. - View Dependent Claims (12)
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20. A method for the inspection of steel reinforcements in concrete structures with parallel sides and of great size as compared to the size of the equipment, as in the case of reinforcement bars within a reinforced concrete slab, comprising the steps of:
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a) displacing the support for the radioactive source along the crossmember in preset positions; b) fixing said support of the radioactive source to the crossmember at different preset heights with respect to the structure under study, c) holding said crossmember by means of two bars inserted into a first rack and oriented diagonally with respect to the first rack, d) determining the position of the source with high accuracy without the need of intervention by the operator.
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21. A method for the three-dimensional determination of the objects within a body under study, comprising the following steps:
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a) defining a coordinate system fixed to the body under examination; b) indicating the arrangement of the recording means with respect to the coordinate system of paragraph a) above; c) determining the position of the fiducial marks resulting from the reference elements in the racks, and then determining the position of both the source and the recording means with respect to the piece under study, based on the position of such fiducial marks; d) determining the profiles of the projections of the steel bars on the recording means; e) three-dimensional mapping of the location and diameter of steel bars within the cone defined by the profile of the projections of the steel bars and the position of the source, by combining the information obtained during various measurements on the same section; f) presenting the results corresponding to the tomographic reconstruction on the coordinates defined in paragraph a) above.
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Specification