Design and fabrication of a fiber-optic interferometric accelerometer system
Chipkevich, Mary Beth A.
Gardner, David L.
Brown, David A.
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Two fiber-optic accelerometer designs are presented. The first accelerometer was constructed using two flexural disks between which is a center spindle. Six uniformly spaced screws fasten the disk assembly to a circular, hollow base housing fiber-optic couplers and splices and providing fiber access. The disk edge is elastically restrained. A flat spirally wound coil of optical fiber is bonded to on surface of each disk. Disk surface strains, caused by acceleration, are detected in a push-pull fashion by fiber coils comprising the legs of a Mach-Zender optical interferometer. This sensor demonstrated an acceleration sensitivity og 2.3 +/- 0.1.rad g over a bandwidth of 150-475 Hz. The resonance frequency was q.22 +/- 0.05 kHz. The second accelerometer design described exploits the benefits of using a disk material having a significantly slower sound speed that aluminum, in general, a slower sound speed increases the acceleration sensitivity and decrease the resonance frequency. One polycarbonate disk with a simply supported edge condition is fastened between an aluminum cap and an aluminum housing base secured with six uniformly spaced screws. On flat fiber coil in each Mach-Zender interferometer leg was bonded to each disk surface. This sensor demonstrated an accelerometer sensitivity of 56.0 +/- 4.0 rad/g over a bandwidth of 30-950 Hz. The resonance frequency was 1.7 +/- 0.05 kHz. Both sensors are compatible with the symmetric #x# demodulator developed at the Naval Postgraduate School. The second sensor and demodulator have been integrated and constitute a sensor system, but testing has not been completed.
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