Magnetic Resonance-Compatible Tactile Force Sensor Using Fiber Optics and Vision Sensor

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53 Citations (Scopus)

Abstract

This paper presents a fiber optic based tactile array sensor that can be employed in magnetic resonance environments. In contrast to conventional sensing approaches, such as resistive or capacitive-based sensing methods, which strongly rely on the generation and transmission of electronics signals, here electromagnetically isolated optical fibers were utilized to develop the tactile array sensor. The individual sensing elements of the proposed sensor detect normal forces; fusing the information from the individual elements allows the perception of the shape of probed objects. Applied forces deform a micro-flexure inside each sensor tactel, displacing a miniature mirror which, in turn, modulates the light intensity introduced by a transmitting fiber connected to a light source at its proximal end. For each tactel, the light intensity is read by a receiving fiber connected directly to a 2-D vision sensor. Computer software, such as MATLAB, is used to process the images received by the vision sensor. The calibration process was conducted by relating the applied forces to the number of activated pixels for each image received from a receiving fiber. The proposed approach allows the concurrent acquisition of data from multiple tactile sensor elements using a vision sensor such as a standard video camera. Test results of force responses and shape detection have proven the viability of this sensing concept.

Original languageEnglish
Pages (from-to)829-838
Number of pages10
JournalIEEE SENSORS JOURNAL
Volume14
Issue number3
DOIs
Publication statusPublished - Mar 2014

Keywords

  • Tactile array sensor
  • fiber optics
  • vision sensor
  • MINIMALLY INVASIVE SURGERY
  • DESIGN
  • ROBOT
  • TECHNOLOGY

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