Development of a new displacement-measuring ultrasonic sensor based on astigmatic focus error detection
| Project/Area Number |
08555039
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
機械工作・生産工学
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| Research Institution | KEIO UNIVERSITY |
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Principal Investigator |
MITSUI Kimiyuki Keio University, Faculty of Science and Technology, Professor, 理工学部, 教授 (90219668)
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| Co-Investigator(Kenkyū-buntansha) |
TSUKAMOTO Hidehiko Mitsubishi Heavy Industries, LTD.Hiroshima Laboratory, Vice General Manager, 技術本部・広島研究所, 次長
塚本 頴彦 三菱重工業(株), 技術本部・広島研究所, 次長(研究職)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥10,000,000 (Direct Cost: ¥10,000,000)
Fiscal Year 1997: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1996: ¥7,000,000 (Direct Cost: ¥7,000,000)
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| Keywords | ultrasonic wave / astigmatism / astigmatic focus error detection / non-contact measurement / displacement measurement / in-process measurement |
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| Research Abstract |
In-process measurement is generally considered to be the most functional method for obtaining high-dimensional accuracy during cutting and grinding operations, with contact type sizing devices being commonly used when such accuracy is required. Optical techniques are not suitable for use in these operations due to wet conditions arising from lubricant application.
In contrast, corresponding ultrasonic techniques can be effectively applied when fully immersed in a liquid, though another problem occurs regarding measurement accuracy of conventional ultrasonic displacement sensors which employ the pulse-echo method. The resolution is, typically, 2-20mum, which is not adequate to meet desired in-process measurement standards.
This drawback in measurement resolution led us to develop an entirely new type of ultrasonic displacement measurement method, i.e., we built the first-ever displacement-measuring ultrasonicsensor whose operation is based on the principle of astigmatic focus error detection. Basically, the sensor incorporates a cylindrical acoustic lens that detects a change in distance between an acoustic objective lens and target surface converting it to an equivalent change in sound pressure distribution which is measured by a quadrant type ultrasonic detector. Here, we describe in detail the measuring principle of this new method and the basic analysis applied in the design method, after which results of experimental evaluations are presented demonstrating method/system suitability to meet its intended application as an in-process measurement device possessing high-dimensional accuracy during cutting or grinding operations.
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Report
(3 results)
Research Products
(5 results)
