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Vol. 184, Issue 1, January 2015, pp. 19-25




Sensitivity of Miniaturized Photo-elastic Transducer for Small Force Sensing

1 Naceur-Eddine KHELIFA, 2 Marc HIMBERT

1 Laboratoire Commun de Métrologie LNE-Cnam, 1 rue Gaston Boissier, F75724 Paris, France
2 Laboratoire Commun de Métrologie LNE-Cnam, 61 rue du Landy, La plaine, 93210, France
1 Tel.: +33 (0) 40 43 37 78, fax: +33 (0) 1 40 43 37 37

1 E-mail: naceur.khelifa@cnam.fr


Received: 14 November 2014 /Accepted: 15 December 2014 /Published: 31 January 2015

Digital Sensors and Sensor Sysstems


Abstract: The sensitivity of a force sensor based on photo-elastic effect in a monolithic Nd- YAG laser depends strongly on the geometrical shape and dimensions of the laser medium. The theoretical predictions of sensitivity are in good agreement with first results obtained with a plano- concave cylindrical crystal of (4´4) mm and some values reported by other groups. However, for small size of the laser sensor, the developed model predicts sensitivity, about 30 % higher than the values given by available experiments. In this paper, we present experimental results obtained with a force sensor using a miniaturized monolithic cylindrical Nd-YAG laser of dimensions (2´3) mm with suitable optical coatings on its plane end faces. The new result of measurement concerning the sensitivity has allowed us to refine the theoretical model to treat photo-elastic force sensors with small dimensions.


Keywords: Stress birefringence, Solid-state laser, Photo-elastic effect, Small force sensor, Beat frequency, Sensitivity.


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