Showing papers by "José A. Ferrari published in 1996"
TL;DR: An all-fiber vibration sensor based on step interferometry in which the ends of the reference and signal arms are assembled and fixed together to produce regular distributed interference fringes is described.
Abstract: An all-fiber vibration sensor based on step interferometry is described. The sensor consists of a modified Michelson interferometer in which the ends of the reference and signal arms are assembled and fixed together to produce regular distributed interference fringes. Five photodetectors with relative phase shifts of π/2 placed on the fringes acquire five intensity patterns simultaneously. One reconstructs the vibration amplitude by using the well-known five-step algorithm. A vibration sensor with these characteristics was constructed, and its performance was investigated.
12 citations
TL;DR: In this article, a simple method for measuring the outer diameter of an optical fiber is presented based on observing the interference of light reflected in the fiber-air interfaces of a fiber side illuminated by a laser beam at oblique incidence.
Abstract: A simple method for measuring the outer diameter of an optical fiber is presented. The method is based on observing the interference of light reflected in the fiber–air interfaces of a fiber side illuminated by a laser beam at oblique incidence. This technique is easy to implement and could be used for real-time monitoring of fiber diameter during fiber drawing.
2 citations
TL;DR: A gravity referenced optical inclinometer which uses a transparent fluid as angle-sensor element is described, and its principle of operation is based on light refraction at a free surface of the fluid.
Abstract: A gravity referenced optical inclinometer which uses a transparent fluid as angle-sensor element is described. Its principle of operation is based on light refraction at a free surface of the fluid. Measurements were carried out in an optical inclinometer built by the authors, and a resolution of 0.007° was obtained. The inclinometer permits real-time angle determinations along two perpendicular axis.