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Browse Prior Art Database

Non-Contact Displacement Measurement System Having One Microinch Resolution

IP.com Disclosure Number: IPCOM000042292D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Cachon, RP: AUTHOR [+2]

Abstract

A measurement system capable of measuring relative displacements to a resolution of one microinch (min) is disclosed. As shown in Fig. 1, the measurement system includes a gas connected by tubing 3 to an air probe 4 and a bellows 5. The air probe 4 includes a precision bore exit tip for the tubing 3. Adjacent to the air probe 4 is a precision differential screw 6 with a resolution of 5 min and having an end flat 7 attached to the end of its shaft. It is the changes in the spacing between the air probe 4 and the end flat 7 which are measured. In actual use an object whose relative displacement as a function of some other variable is to be measured would replace the differential screw 6.

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Non-Contact Displacement Measurement System Having One Microinch Resolution

A measurement system capable of measuring relative displacements to a resolution of one microinch (min) is disclosed. As shown in Fig. 1, the measurement system includes a gas connected by tubing 3 to an air probe 4 and a bellows 5. The air probe 4 includes a precision bore exit tip for the tubing 3. Adjacent to the air probe 4 is a precision differential screw 6 with a resolution of 5 min and having an end flat 7 attached to the end of its shaft. It is the changes in the spacing between the air probe 4 and the end flat 7 which are measured. In actual use an object whose relative displacement as a function of some other variable is to be measured would replace the differential screw 6. An end of a lever 8 is mounted on the bellows 5 and is pivoted at pivot point 9 with the other end of the lever 8 resting on the core rod of an LVDT probe 10. The pivot point 9 is located so as to provide amplification between the bellows 5 and the LVDT probe 10. The displacement of the core within the coil of the LVDT probe 10 is measured electrically using meter 11. In the operation of this system, a displacement of the end flat 7 relative to the air probe 4 causes a change in the gas pressure within the bellows, causing it to expand or contract. Using the differential screw 6 the displacement of the LVDT probe 10 can be calibrated as a function of the displacement of the end flat 7. An alternative system...