Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1991-11-04
1993-05-04
Myracle, Jerry W.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73 1205, G01N 310
Patent
active
052071065
ABSTRACT:
An optical fiber (22) is tested for payout properties by supporting it on a payout support (24 ), preferably in the form of a hollow frustum of a cone, and attaching an unsupported end (26 ) of the optical fiber (22) to a projectile (42) that is thereafter propelled rapidly by expanding gas. The expanding gas is preferably generated explosively or by pressurizing the rearward end of the stationary projectile (42) and then releasing the projectile (42). A pneumatic gun (40) suitable for such testing has a barrel (44) sufficiently large to receive the projectile (42), a latching mechanism (60) that releasably engages the projectile (42), a closure (50) at the rearward end of the barrel (44) with a bore (58) therethrough concentric with the axis of the barrel (44) through which the optical fiber (22) passes and is drawn. The pneumatic gun (40) further includes a gas reservoir (48) that supplies a pressurized gas to the back side of the projectile (42). In operation of the pneumatic gun (40), the gas pressure is raised to a desired level with the projectile (42) latched, and then the latching mechanism (60) is released to permit the projectile (42), and attached optical fiber (22), to move rapidly forward as the gas expands.
REFERENCES:
patent: 229058 (1880-06-01), Spencer
patent: 4077349 (1978-03-01), Paul
patent: 5103678 (1992-04-01), Covino-Hrbacek et al.
Schwider Alfred M.
Wysocki Joseph A.
Brown C. D.
Denson-Low W. K.
Heald R. M.
Hughes Aircraft Company
Myracle Jerry W.
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