PHOSFOS: Difference between revisions

Revision as of 04:58, 21 August 2022

Revision as of 22:24, 7 December 2023

Line 35:

The key areas where significant progress has been made are listed below:<ref>{{Cite web |url=http://www.phosfos.eu/eng/Phosfos/Facts-Results |title=Facts & Results / Phosfos / Home - PHOSFOS - Photonic Skins for Optical Sensing |access-date=2011-08-14 |archive-url=https://web.archive.org/web/20111126031453/http://www.phosfos.eu/eng/Phosfos/Facts-Results |archive-date=2011-11-26 |url-status=dead }}</ref>

* Silica [[microstructured fiber]]s for temperature-insensitive optical sensors - a new pressure-sensitive and temperature-insensitive optical fibre sensor has been developed. The sensor uses a [[fiber Bragg grating]] written into a [[microstructured fiber]]. The pressure sensitivity exceeds the state-of-the-art with a factor of 20, whilst the sensor is truly temperature-insensitive. The sensor is based on a novel design of a highly birefringent (10⁻³) microstructured optical fibre sensor that is designed to have a high pressure sensitivity (3.3 pm/bar), whilst at the same time exhibit negligible temperature sensitivity (10⁻² pm/K). The fabrication method is compatible with conventional ultraviolet grating inscription setups for [[fiber Bragg grating]] manufacture. The temperature insensitivity was achieved by tailoring the design of the doped region in the core of the [[microstructured fiber]] via a series of design iterations.<ref>{{Cite web |url=http://www.phosfos.eu/eng/Phosfos/Facts-Results/Fact-sheet-01-Silica-Microstructured-Optical-Fibre-Sensor |title=Fact sheet 01: Silica Microstructured Optical Fibre Sensor / Facts & Results / Phosfos / Home - PHOSFOS - Photonic Skins for Optical Sensing |access-date=2011-08-14 |archive-url=https://web.archive.org/web/20111126051342/http://www.phosfos.eu/eng/Phosfos/Facts-Results/Fact-sheet-01-Silica-Microstructured-Optical-Fibre-Sensor |archive-date=2011-11-26 |url-status=dead }}</ref>

* Embedded optoelectronic devices - the possibility to integrate optical sources and photodetectors, compatible with the optical fibre sensors has been developed within the PHOSFOS project. The optoelectronic components are thinned down by polishing until they are only 20 μm thick so that they become flexible themselves without compromising functionality. Thin optical sources and detectors are then embedded in optical clear polymers, and electrically contacted using well-established micro- via, metallization and patterning technologies.<ref>{{Cite web |url=http://www.phosfos.eu/eng/Phosfos/Facts-Results/Fact-Sheet-02-Embedded-Opto-electronic-Chips |title=Fact Sheet 02 - Embedded Opto-electronic Chips / Facts & Results / Phosfos / Home - PHOSFOS - Photonic Skins for Optical Sensing |access-date=2011-08-14 |archive-url=https://web.archive.org/web/20111127063559/http://www.phosfos.eu/eng/Phosfos/Facts-Results/Fact-Sheet-02-Embedded-Opto-electronic-Chips |archive-date=2011-11-27 |url-status=dead }}</ref>

* Integrated sensors and optoelectronics - several different approaches for embedding optical fibre sensors in a flexible and stretchable host material, including injection molding, laser structuring, and soft lithography were considered. The influence of the embedding process was studied for silica and polymer [[fiber Bragg gratings]]. Temperature, humidity, strain, curvature and pressure sensitivities were fully characterized for different flexible host materials. An approach in which the embedded optoelectronic chips can be efficiently coupled towards the optical fiber sensors, using dedicated coupling structures, incorporating a 45˚ micromirror, as well as a fiber alignment groove was proposed. This allowed low cost components to be used in combination with well-established fabrication technologies, to demonstrate a truly low cost fully integrated sensing foil for biomedical applications.<ref>{{Cite web |url=http://www.phosfos.eu/eng/Phosfos/Facts-Results/Fact-Sheet-03-Integrating-Sensors-and-Opto-electronics-in-Flexible-Materials |title=Fact Sheet 03 - Integrating Sensors and Opto-electronics in Flexible Materials / Facts & Results / Phosfos / Home - PHOSFOS - Photonic Skins for Optical Sensing |access-date=2011-08-14 |archive-url=https://web.archive.org/web/20111127063605/http://www.phosfos.eu/eng/Phosfos/Facts-Results/Fact-Sheet-03-Integrating-Sensors-and-Opto-electronics-in-Flexible-Materials |archive-date=2011-11-27 |url-status=dead }}</ref>

Line 41:

The PHOSFOS consortium has developed a means for reliably splicing POF to silica fibre and produced the first gratings in the 800&nbsp;nm spectral region where losses are almost 2 orders of magnitude less than at 1550&nbsp;nm. These developments have allowed POF grating sensors to be used outside the laboratory for the first time.<ref>{{Cite web |url=http://www.phosfos.eu/eng/Phosfos/Facts-Results/Fact-Sheet-04-Polymer-Fibre-Bragg-Gratings |title=Fact Sheet 04 - Polymer Fibre Bragg Gratings / Facts & Results / Phosfos / Home - PHOSFOS - Photonic Skins for Optical Sensing |access-date=2011-08-14 |archive-url=https://web.archive.org/web/20111127063610/http://www.phosfos.eu/eng/Phosfos/Facts-Results/Fact-Sheet-04-Polymer-Fibre-Bragg-Gratings |archive-date=2011-11-27 |url-status=dead }}</ref>

* Wavelength multiplexed polymer fiber Bragg gratings - once the fiber connection issue was solved it was possible to fabricated the first ever wavelength division multiplexed (WDM) Bragg grating sensors in polymer optical fibre (POF). Moreover, by characterizing and using the thermal annealing properties of the fibre it was possible to shift the reflecting wavelength of a grating by over 20&nbsp;nm, to enable multiple WDM sensors to be recorded with a single phase mask.

<ref>{{Cite web |url=http://www.phosfos.eu/eng/Phosfos/Facts-Results/Fact-Sheet-05-Wavelength-Multiplexed |title=Fact Sheet 05 - Wavelength Multiplexed / Facts & Results / Phosfos / Home - PHOSFOS - Photonic Skins for Optical Sensing |access-date=2011-08-14 |archive-url=https://web.archive.org/web/20111127063615/http://www.phosfos.eu/eng/Phosfos/Facts-Results/Fact-Sheet-05-Wavelength-Multiplexed |archive-date=2011-11-27 |url-status=dead }}</ref>