Opti-mechanical displacement indicator with high sensitivity

Details Opti-mechanical displacement indicator with high sensitivity Opti-mechanical displacement indicator with high sensitivity

G - Physics

01

B

G01B 5/14 (2006.01) F16B 31/02 (2006.01) G01B 11/14 (2006.01) G01D 5/32 (2006.01) G01L 5/24 (2006.01)

Patent

CA 2048667

In an indicator for visually displaying extremely small displacements between two points within a structure, a change of color visible through an indicator window (26) occurs during a preselected portion of a predetermined displacement within the structure. The color change occurs due to an increase in thickness of a light- absorbing fluid (42) in the central area of a clear, flexible indicator means separating a colored portion from the indicator window. Substantially no light-absorbing fluid is permitted to enter the central area until a preselected displacement has occurred since the colored portion is firmly, resiliently biased against the indicator window until that amount of displacement has occurred. Thereafter, light-absorbing fluid is permitted to enter the central area. This device concentrates visual indications of displacements into limited segments of an overall displacement,

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