Non-Contact Displacement Measurement System Having One Microinch Resolution
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
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.