In a method aspect, a method of manufacturing an optical fiber sensor is provided. The method includes providing a structure-forming fiber having a central portion etchable at a first rate when exposed to an etching medium, a inner cladding portion surrounding the central portion having a second etching rate that is greater than the etching rate of the central portion when exposed to the etching medium, and an annular outer cladding portion surrounding the inner cladding portion having a third etching rate that is less than the etching rate of both the central portion and the inner cladding portion when exposed to the etching medium; and exposing an end of the structure-forming fiber to the etching medium for a sufficient time to produce an outer dimension Do, a pedestal, and a gutter surrounding the pedestal having a gutter depth defining an active region of length, L, wherein L/Do ≥ 0.5.
F.32 International patent
COBISS.SI-ID: 18957334In 2015 Denis Đonlagić accepted the role of a sectoral editor of the journal Applied Optics, namely in the field of optical sensors and optical fibers. Applied Optics is one of the major journals in the field of optics (pubished 36x per year) and published by the OSA (Optical Society of America). It is the leading scientific journal in the field of applied optics and photonics with more than 50 years of tradition.
C.04 Editorial board of an international magazine
The patent application represents basis for manufacturing of next generation of strain sensors. The present invention relates to optical sensors, and more particularly to optical fiber sensors and systems including them. The optical fiber sensor whit long active length is composed of a lead-in fiber that also forms the first FP semi-reflective surface, an outer (semi-conical) wall, a second FP semi-reflective surface, a gutter that surrounds the second FP semi-reflective surface, pedestal and a second lead-in fiber. The active length of fiber sensor is defined by gutter depth. The strain measurement system includes an optical fiber sensor adapted to be coupled to an object undergoing strain, the optical fiber sensor including a lead-in optical fiber and an optical element coupled thereto including a signal processor coupled to the optical fiber sensor. Signal processor is operable to generate and pass a light signal into the lead-in optical fiber, receive a light signal reflected from at least the retracted surface of the optical element, and determine a strain applied to the object. The main advantage of the proposed sensor system is that cavity length and active length are separated by the gutter length in order to improve sensitivity. Method of manufacturing an optical fiber sensor includes a few possibilities to providing a structure-forming fiber; and micromachining the structure-forming fiber to produce an outer dimension, a pedestal, and a gutter surrounding the pedestal having a gutter depth defining an active region of length. The present invention also relates to measuring system in order to define signal interrogation technique in manner of coupling signal into in-line fiber and receiving of a reflected light signal, all that to determine strain applied to the object.
F.32 International patent
COBISS.SI-ID: 17639190Together with Optacore technology to produce compacts preforms that allow centro-asymmetric construction of the phosphorus-doped core was developed. This type of technology has enabled the manufacturing of fibers, which in further process of micromachining led to the production of important micro-structures which have been used in the development of the two parametric sensor for the simultaneous measurement of the refractive index and the temperature with ultra-high resolution.
F.09 Development of a new technological process or technology
Micromachining of all-fiber photonics’ structures, based on the selective etching of structure forming optical fibers (SFF) is presented. A maskless micromachining process can reform or reshape a section of an optical fiber into a complex 3D photonic microstructure. This proposed micromachining process is based on the introduction of phosphorus pentoxide (P2O5) into silica glass through standard fiber manufacturing technology. Micro-machining is presented as a highly effective tool for the realization of new solutions in the design of optical sensors and microfluidic devices.
B.04 Guest lecture
COBISS.SI-ID: 19708182