Magnetostriction Induced Fiberoptic Metal Profile Detector
This paper describes the design and construction of a magnetostrictive composite-fiber-optic Mach-Zehnder interferometer capable of magnetic field and metal profile measurement. Unlike previous metal detectors, the sensor makes use of the magnetostriction effect on a fiber-optic interferometer to detect metallic objects. The metal detector overcomes many difficulties existing in conventional metal detectors. Aside from offering relatively high sensitivity (sensitivity of about 70.7 × 10−3 rad/gauss), the optical detection provides resistance to RF interference which is common in typical electromagnetic type metal detectors. The magnetostrictive sensor is also relatively compact and able to achieve a minimum spatial resolution of 1 cm2 for metal profile detection.
KeywordsFiberoptic sensor Metal detector Metal profile detector Magnetostriction Magnetostrictive polymer
This work is supported in part by NIH grant R01 EB007636-01A4.
- 1.Sharawi MS, Sharawi MI (2007) Design and implement of a low cost VLF metal detector with metal-type discrimination capabilities. In: Proceedings of IEEE international conference on signal processing and communications, Dubai, United Arab Emirates, 24–27 Nov 2007Google Scholar
- 2.Payne GC (1985) Metal detector system for identifying targets in mineralized ground. US Patent 4,507,612, Mar 26 1985Google Scholar
- 3.Hua WS, Hooks J, Wu WJ, Wang WC (2010) Development of a novel polymeric fiber-optic magnetostrictive metal detector. SPIE health monitoring of structural and biological systems, San Diego, CA, 7–10 Apr 2010, SSN10-82Google Scholar
- 4.Joule JP (1842) On the new class of magnetic force. Ann Electr Magn Chem 8:219–224Google Scholar
- 5.Joule JP (1847) On the effect of magnetism upon the dimension of iron and steel bars. Phil Mag 30:76–92Google Scholar
- 6.Hua WS, Hooks J, Wu WJ, Wang WC (2010) Development of a polymer based fiberoptic magnetostrictive metal detector system. In: Proceedings of international symposium on optomechatronic technologies (ISOT 2010), Toronto, Ontario, Canada, 25–27 Oct 2010Google Scholar
- 7.Hua WS, Wang WC (2011) Development of a ferromagnetic polymeric metal detector system. SPIE health monitoring of structural and biological systems, San Diego, CA, Mar 6–10 2011Google Scholar
- 8.Hua WS, Hooks J, Wu WJ, Wang WC (2011) A polymeric fiberoptic metal sensor capable of profile detection (ICAST 2011), 10–12 Oct 2011 at Imperial Hotel, Corfu, GreeceGoogle Scholar