Measuring and testing – Ductility or brittleness
Patent
1975-11-17
1976-10-26
Myracle, Jerry W.
Measuring and testing
Ductility or brittleness
116DIG34, 116124R, G01L 124
Patent
active
039876683
ABSTRACT:
An indicator for optically indicating small displacements or changes in displacement of one member relative to another member, comprising a light transmitting member having a faceted light reflective under surface, and an opaque, light absorbing member disposed beneath the light transmitting member, whereby when the two members are separated by a thin film of air, incident light transmitted through the transmitting member is totally internally reflected at the under surface displaying a bright appearance to an observer. When the two members are forced into intimate contact by a displacement to be indicated, the incident light is absorbed by the second member and a dark appearance is presented to an observer. The light absorbing member's upper surface may be a negative replica of the under surface of the transmitting member in which case an abrupt change in transmitted light is observable upon a displacement, or the absorbing member may have a flat upper surface formed of an elastomeric material so that there is a gradually increasing area of contact between the two members and a more gradual change in appearance from bright to dark.
REFERENCES:
patent: 2437555 (1948-03-01), Rees
patent: 3799108 (1974-03-01), Mosow
patent: 3817204 (1974-06-01), Schittek
Myracle Jerry W.
Neilan George J.
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