Residual stress estimation apparatus and method
AssigneesHyundai Motor Company, Kia Corporation, Industrial Cooperation Foundation Jeonbuk National University
InventorsEun Jeong Choi, Keum Hyang Lee, Min Chul Shin, Chan Ho Jeong, Lae Hyong Kang, Hye Lim Jang, Dae Hyun Han
Life of this patent
Estimating the term…
Abstract
An apparatus performs a method for estimating residual stress of a material such as plastics. The apparatus includes an inspection unit configured to emit a terahertz wave to a subject to be inspected and to detect the terahertz wave transmitted through or reflected from the subject, and a controller configured to estimate residual stress of the subject based on the terahertz wave detected by the inspection unit.
Claims18
An apparatus for estimating residual stress, comprising:
- an inspection unit comprising:
- a generator configured to generate and emit a first terahertz wave to a subject to be inspected,
- a detector configured to receive the first terahertz wave emitted from the generator and to detect a second terahertz wave that is transmitted through or reflected from the subject,
- a first polarizer disposed downstream relative to the generator in a first propagation direction of the first terahertz wave, and
- a second polarizer disposed upstream relative to the detector in a second propagation direction of the second terahertz wave;
- and
- a controller configured to estimate the residual stress of the subject based on the first terahertz wave and the second terahertz wave,
- wherein the inspection unit is configured to:
- rotate the first polarizer and the second polarizer, and
- detect a set of terahertz waves detected based on rotating the first polarizer and the second polarizer by an increment of an angle within an angular range while maintaining the first polarizer and the second polarizer to be orthogonal to each other.
A method for estimating residual stress, the method comprising:
- emitting, by a generator, a first terahertz wave to a subject;
- detecting, by a detector, a second terahertz wave that is transmitted through or reflected from the subject based on the first terahertz wave being incident to the subject;
- and
- estimating, by a controller, the residual stress of the subject based on the first terahertz wave and the second terahertz wave,
- wherein detecting the second terahertz wave comprises:
- rotating a first polarizer and a second polarizer, and
- detecting a set of terahertz waves detected based on rotating the first polarizer and the second polarizer by an increment of an angle within an angular range while maintaining the first polarizer and the second polarizer to be orthogonal to each other.
Dependencies are inferred from the claim text.