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Optical Transducer

IP.com Disclosure Number: IPCOM000098450D
Original Publication Date: 1960-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Harris, JP: AUTHOR

Abstract

Detection and observation of extremely minute displacements, which occur in a random, variable manner at high rates of speed, are simplified with this apparatus. A microscope 1 is modified to work as a transducer in conjunction with a source of light 2 and an oscilloscope 3. The upward and downward displacement of a magnetic tape 4, as it moves rapidly toward or away from the observer through an air bearing station 5 on a modified table 6 of the microscope, is translated into the variable waveform 7 on the oscilloscope.

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Optical Transducer

Detection and observation of extremely minute displacements, which occur in a random, variable manner at high rates of speed, are simplified with this apparatus. A microscope 1 is modified to work as a transducer in conjunction with a source of light 2 and an oscilloscope 3. The upward and downward displacement of a magnetic tape 4, as it moves rapidly toward or away from the observer through an air bearing station 5 on a modified table 6 of the microscope, is translated into the variable waveform 7 on the oscilloscope.

Vertical illumination of a point of focus 8 on the upper surface of the tape 4 is established by passage of light rays 9 from the source 2 and through a prism 10. The light rays are then reflected downwardly from a half silvered glass 11 to the point of focus. The vertical illumination light source 2 is powered by a wet battery 12 to eliminate all drift or ripple in the light intensity.

The microscope objective 13 which typically has a magnification power of 40X is modified by the addition of a glass disc 14. The disc 14 has an opaque area 15 which excludes the light rays 9 from passing directly to the point of focus. When the tape 4 is in its normal plane of movement with respect to bearing 5, a concentrated spot of light about .005 inches in diameter exists at the point of focus. This insures more sensitive changes in light intensity for related displacements of the tape 4.

Light rays 16, which are most intense when the upper...