[특허]Method for inspecting components having complex geometric shapes

Method for inspecting components having complex geometric shapes 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06K-009/00 G01R-033/00
출원번호	US-0772761 (1991-09-16)
발명자 / 주소	Mahdavieh Yaghoub (West Chester OH) Hedengren Kristina H. V. (Schenectady NY)
출원인 / 주소	General Electric Company (Cincinnati OH 02)
인용정보	피인용 횟수 : 69 인용 특허 : 0

초록 ▼

A method for inspecting a component of a gas turbine engine or the like having a plurality of similarly shaped structural portions, such as the gear teeth of a gear, the dovetail slots of a turbine disk or the like, includes the steps of: scanning a surface of at least one of the similarly shaped structural portions with an eddy current probe to induce eddy currents in the component; generating a two-dimensional image of the at least one portion from eddy current signals received during scanning, the image including a multiplicity of pixels arranged in a two-dimensional array and each pixel having a gray scale intensity responsive to the eddy current induced in the component at a component location corresponding to a position of the pixel in the matrix array; preprocessing the image to substantially reduce any signals or changes in the gray scale intensity of any pixels relative to the background pixel intensities of the image caused by geometrical characteristics and background noise common to all similarly shaped structuaral portions; identifying any suspected defect regions from the preprocessed image; determining a defect signal for each suspected defect region; and rejecting the component if any defect signal exceeds a predetermined reference value.

대표청구항 ▼

A method for inspecting a component having a plurality of similarly shaped structural portions, comprising the steps of: (a) scanning a surface of at least one of the similarly shaped structural portions with an eddy current probe means to induce eddy currents in the component; (b) generating a two-dimensional image of the at least one portion from eddy current signals received during scanning, the image including a multiplicity of pixels arranged in a two-dimensional matrix array and each pixel having a gray scale intensity responsive to the eddy current induced in the component at a component location corresponding to a position of the pixel in the two-dimensional matrix array; (c) preprocessing the image to substantially reduce any signals caused by geometrical characteristics and background noise common to all of the similarly shaped structural portions; (d) identifying any suspected defect regions in the two-dimensional image from corresponding regions in the preprocessed image of step (c); (e) determining a defect signal from the gray scale intensities for each suspected defect regions in the two-dimensional image; and (f) rejecting the component if any defect signal exceeds a predetermined reference value, wherein step (c) comprises the steps of: (c1) repeating steps (a) and (b) to generate a two-dimensional image for a second and third similarly shaped structural portion; (c2) selecting a test portion and an associated test image, a first reference portion and an associated first reference image, and a second reference portion and an associated second reference image from the three similarly shaped portions; (c3) taking a difference between the first reference image and the test image to provide a first resulting image by taking a difference between the gray scale intensity of each pixel of the first reference image and the gray scale intensity of a corresponding pixel of the test image; (c4) taking a difference between the second reference image and the test image to provide a second resulting image by taking a difference between gray scale intensities of corresponding pixels of each image; (c5) converting each of the first and second reference images from a gray scale image to respective first and second binary images; and (c6) combining the first and second binary images by a logic AND operation to provide a preprocessed composite binary image.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Method for inspecting components having complex geometric shapes 원문보기

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Method for inspecting components having complex geometric shapes 원문보기

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대표청구항 ▼

연구과제 타임라인

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