Fiberoptic metal detector capable of profile detection

Hua, Wei; Hooks, Joshua; Erwin, Nicholas A.; Wu, Wen-Jong; Wang, Wei Chih

doi:10.1117/12.880661

Cited by 3 publications

(10 citation statements)

References 3 publications

(11 reference statements)

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“…The wooden cart was moved back and forth by hand when the sensor is detecting metal, striving for a constant speed. Based on previous experimental results [4][5][6], we summarized our results. First of all, our metal sensor allowed for detecting the presence of metal objects, but these methods were incapable of mapping its shape [4].…”

Section: Metal Detection Systemmentioning

confidence: 92%

“…Previous studies of our magnetostrictive material (WC-WSJOSH-2) coated on to fibers proves this concept is successful for high permeability metal detection [5]. Also, our previous experimental results show that our metal detector can identify the general geometrical shape of a rod, rectangular bar, wrench and steel plate with two holes [6,7]. This paper discusses the measurement of irregular clamp metal and the results will be compared with the actual geometry of the metal objects.…”

mentioning

confidence: 85%

“…First of all, our metal sensor allowed for detecting the presence of metal objects, but these methods were incapable of mapping its shape [4]. Second, the metal sensor could detect one trial per moving path [5][6]. Therefore, for improving sensing area, the wooden cart with clamp metal was being shifted toward right direction with 1cm by each measurement, then we should be able to achieve metal's profile mapping function.…”

Section: Metal Detection Systemmentioning

confidence: 98%

“…Measurement of the intensity of the resulting strain on the magnetostrictive material is based on the magnetic field induced phase shift in the interferometer given by [8]. In this paper, we use the different layout and geometry that we reported previously [6][7]. In this case, the sensing fiber is bent into a circle shape in order to reduce the detector size (30cm long and 1.5mm thick, see Figure 2) and the magnetostrictive material is manipulated during fabrication by inserting a piece of metal into the middle of senor to increase its sensitivity.…”

Section: Ferromagnetic Polymer Devicementioning

confidence: 99%

“…In previous publications [5][6][7], the different metal objects were placed under the cart or rotator, parallel to the metal detector. For example we have tested steel rods, rectangular bars, wrenches and a steel plate with two holes.…”

Section: Metal Detection Systemmentioning

confidence: 99%

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2D metal profile detector using a polymeric fiber optic sensor

et al. 2012

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As sensors become integrated in more applications, interest in magnetostrictive sensor technology has blossomed. Magnetostrictive materials have many advantages and useful applications in daily life, such as high efficient coupling between elastic and polymer material, large displacement, magnetic field sensors, micro actuator and motion motor, etc. The purpose of this paper is to develop a metal sensor which is capable of detecting different geometries and shapes of metal objects. The main configuration is using a Mach-Zehnder fiber-optic interferometer coated with magnetostrictive material. The metal detector system is a novel design of metal detector, easy to fabricate and capable of high sensitivity. In our design, metal detection is made possible by disrupting the magnetic flux density that encompasses the magnetostriction sensor. In this paper, experimental setups are described and metal sensing results are presented. The results of detecting complex metal's geometry and metal's mapping results are discussed.Keywords: fiber-optic sensor, metal detector, polymeric magnetostrictive material; ferromagnetic polymer, MachZehnder interferometer. INTRODUCTIONThe last twenty years have seen an explosion in metal sensor technology. Currently metal detectors can be categorized into three basic technologies: very low frequency (VLF), pulse induction (PI), and beat-frequency oscillation (BFO) [1][2][3]. In general, metal detector technology is a huge part of our daily lives, with a range of uses which spans from leisure to work to safety. They are commonplace in libraries, airports security, historical sites, prisons, stores, armed forces, shops and government buildings. These conventional metal detector systems share common shortcomings, such as not being able to detect the profile of a metal object, being resistant to RF interference caused by the surrounding electronics devices, and being relatively bulky in size. As we known, the recent increased interest in magnetostrictive sensor technology results from improvement in magnetostrictive material performance. In this paper, our research will concentrate on developing a novel compact metal detector system that overcomes aforementioned shortcomings. As we have previously published [4], our metal detector system is integrated Mach-Zehnder fiber-optic interferometer with the novel magnetostrictive material. The main concept of our metal detector is using a simple DC magnetic field scheme with the magnetostrictive material as the sensing device. The overall main configuration consists of fiber-optic MachZehnder interferometers, DC magnetic autotransformer, magnetostrictive sensor, and Hall Effect sensor as the reference. For our detector, a fiber-optic magnetic field sensor uses the change in length of a magnetostrictive element in the presence of a magnetic field to change the optical path length of a fiber optic magnetic sensor. Therefore, our metal detection is made possible by monitoring strain-induced optical path length change in the interferometer which stems from...

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Section: Metal Detection Systemmentioning

confidence: 92%

mentioning

confidence: 85%

Section: Metal Detection Systemmentioning

confidence: 98%

Section: Ferromagnetic Polymer Devicementioning

confidence: 99%

Section: Metal Detection Systemmentioning

confidence: 99%

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2D metal profile detector using a polymeric fiber optic sensor

et al. 2012

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Magnetostriction Induced Fiberoptic Metal Profile Detector

Wang

Estroff

Hua

2014

Progress in Optomechatronic Technologies

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A polymeric fiber-optic metal profile detector

Hua

Hooks

Erwin

et al. 2012

Journal of Intelligent Material Systems and Structures

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This is a feasibility study of the design and construction of a metal detector system using a fiber-optic Mach-Zehnder interferometer and a sensor employing a novel polymeric magnetostrictive material. This ferromagnetic polymeric metal detector system is small and easy to fabricate, offering relatively high sensitivity and resistance to the radio frequency interference common in most electromagnetic metal detectors. The metal detection is achieved by disrupting the magnetic flux density that encompasses the magnetostrictive sensor. This article discusses the magnetic properties of the ferromagnetic polymers and the results of detecting metal objects of different shapes and geometries.

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Fiberoptic metal detector capable of profile detection

Cited by 3 publications

References 3 publications

2D metal profile detector using a polymeric fiber optic sensor

2D metal profile detector using a polymeric fiber optic sensor

Magnetostriction Induced Fiberoptic Metal Profile Detector

A polymeric fiber-optic metal profile detector

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