Design and fabrication of a fiber-optic interferometric accelerometer system
Chipkevich, Mary Beth A.
Gardner, David L.
Brown, David A.
MetadataShow full item record
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.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Olcott, Joanne E. (Monterey, California. Naval Postgraduate School, 1991);The fabrication and calibration of a fiber-optic flexural disk accelerometer is discussed in this thesis. The accelerometer is comprised of a cylindrical body with thin, flexible end plates (or disks) and an interior ...
On the design of a MEMS piezoelectric accelerometer coupled to the middle ear as an implantable sensor for hearing devices Gesing, A.L.; Alves, F.D.P.; Paul, S.; Cordioli, J.A. (2018);The presence of external elements is a major limitation of current hearing aids and cochlear implants, as they lead to discomfort and inconvenience. Totally implantable hearing devices have been proposed as a solution to ...
Gardner, D.L.; Hofler, T.; Baker, S.R.; Yarber, R.K.; Garrett, S.L. (1987-07);A fiber-optic interferometric sensor has been developed which consists of a seismic mass of 520 gm supported by two rubber mandrels, each wound with a single layer of single-mode optical fiber 6.5 m long. One end of ...