Optical fiber specklegram sensor for multi-point curvature measurements

Autor(es)

Fujiwara, Eric ; Cabral, Thiago Destri

• Tipo de documento: Artigo Científico
• Fonte: APPLIED OPTICS; v. 61, n. 23, p. 8-pg., 2022-08-10.

Resumo

We present a multi-point curvature sensor based on optical fiber specklegram measurements. Apart from the current approaches, the proposed system uses an ordinary multimode fiber excited with visible light as a reflection-type probe. Besides, this method discretizes the waveguide into segments connected by joints and assumes sequential bend events, simplifying the specklegram referencing for correlation analyses and avoiding laborious deep learning processing. Sensor characterization yielded a linear response with similar to 1.3 degrees resolution for single curvatures, whereas shape prediction experiments in the plane resulted in maximum errors of similar to 3.5 degrees and similar to 5.4 mm for angular and linear positioning, respectively. Furthermore, exploratory tests indicated errors < 2.3 degrees regarding probe curvatures in the space. This research introduces a feasible, straightforward alternative to the available shape sensors, enabling applications in medical probes and soft robotics. (C) 2022 Optica Publishing Group (AU)

• Processo FAPESP: 17/25666-2 - Desenvolvimento de sensor de fibra óptica para medição de sinais de miografia de força aplicado a interfaces humano-robô
• Beneficiário: Eric Fujiwara
• Modalidade de apoio: Auxílio à Pesquisa - Regular