NDLI: A micro opto-mechanical displacement sensor based on micro-diffraction gratings: Design and characterization

Content Provider	IEEE Xplore Digital Library
Author	Accoto, D. Schena, E. Cidda, M. Francomano, M. Saccomandi, P. Silvestri, S.
Copyright Year	2013
Description	Author affiliation: Center for Integrated Res., Univ. Campus Bio-Medico di Roma, Rome, Italy (Accoto, D.; Schena, E.; Cidda, M.; Francomano, M.; Saccomandi, P.; Silvestri, S.)
Abstract	A micro opto-mechanical displacement sensor is here presented. It is constituted by a sensing element based on two overlapped micro-diffraction gratings (MDGs). They present a platinum layer (45 nm of thick) on a glass substrate, a period of 525 μm constituted by a width of 150 μm of platinum separated (71.4% duty cycle). The working principle is based on the modulation of light intensity induced by the relative displacement between the MDGs: when a laser light perpendicularly hits the MDGs, the intensity of the transmitted light is a periodic function of the relative displacement between the two MDGs. A fiber optic is used to transport the transmitted light to a photodetector in order to avoid concerns related to the alignment between the optical components. The sensor's output is the ratio between the light intensity measured by the photodetector during the displacement of the MDGs and largest light intensity values measured in the whole range of measurement, therefore, it is lower than 1. The proposed sensor allows to discriminate displacement lower than 10 μm, using a cost effective micro-fabrication process implemented by the technique of Lift-Off. It shows a good linear behaviour in two ranges covering about one half of the MDGs period. Within the linear ranges it shows high sensitivity (about 0.5%/μm) and good accuracy (lower than 4 % in the whole range of calibration); furthermore, the results show that a design with a duty cycle of 50 % overcomes the marked decrease of sensitivity in a range of measurement corresponding to a grating period.
Starting Page	4714
Ending Page	4717
File Size	449885
Page Count	4
File Format	PDF
ISBN	9781457702167
ISSN	1557170X
DOI	10.1109/EMBC.2013.6610600
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-07-03
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Photodetectors Sensitivity Optical variables measurement Biomedical measurement Optical fibers Displacement measurement Transducers
Content Type	Text
Resource Type	Article
Subject	Signal Processing Biomedical Engineering Health Informatics Computer Vision and Pattern Recognition

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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