Spacecraft structural health-monitoring applications are pushed forward by increased constraints in the cost of launching payloads into orbit that dictates major reduction in structural weight only attained through the use of advanced materials and innovative manufacturing methods. On the other hand, the reduction in structural weight must be tempered against the increased demands on performance, damage tolerance, and lifetime durability . The present paper introduces a demonstrator that shall perform temperature measurements by means of Fiber Bragg Grating (FBG) optic sensors. The aim of the work being undertaken is, on one side, to demonstrate the advantages of using this technology with respect to present temperature monitoring techniques in both telecom satellite and launcher applications, and on the other side to reach the TRL-5 Technology Maturity for Crisa and FiberSensing.
This article describes the setup developments and some of the results obtained for the temperature characterization from -190ºC to more than +300ºC of passive components normally used for space missions, but with a standard operating temperature range in most of the cases. One of the setups used is based on direct contact with Kelvin probes with a multiplexed solution to allow the characterization up to 150 samples in the same thermal cycle. A second measurements setup is used for measurements at higher temperatures based in not standard soldering and the use of a ceramic custom made climatic chamber door.
ASER diodes are increasingly used for space applications, either to pump solid state lasers, in photonic payloads, or as sources for LIDAR or spectrometric applications. In space applications reliability issues are a primary concern and among them, radiation hardness is one of the most distinctive with respect to terrestrial applications. A good deal of effort has been devoted to study specifically the effect of radiation on the performance of the most common visible and near infrared emitting GaAs- and InPbased diode lasers [1-5, and references herein]. Johnston and Miyahira  studied the effect of proton radiation on different types of low power commercial laser diodes with emission wavelengths between 660 and 1550 nm.
Semiconductor lasers (or laser diodes) operating in the wavelength region of 1.8 µm to 3 µm are attractive light sources for applications including remote sensing, laser spectroscopy or pollutant detection. Highly strained InGaAs Quantum Wells (QW) grown on InP substrates can operate up to wavelengths slightly higher than 2 µm. GaInAsSb active layers on GaSb substrates have potential emission in the 1.7-3.5 µm range. GaSb based DFB lasers emitting at 2 µm were reported for the first time by the University of Würzburg in 2001 . They achieved room temperature emission with output powers up to 10 mW and Side Mode Suppression Ratio (SMSR) of 31 dB. DFB laser diodes can additionally be tuned by changing the operation temperature and
Objectives of the project: Identify, review and evaluate the current status of programmable optoelectronic adaptive elements (POE), design and manufacture a POE produced to an agreed specification (Laser steering POE), test and characterize the produced POE. A particularly important aspect of this contract is to further understanding of how the materials and technologies involved in POE structures react to environmental conditions experienced in space activities, produce a technology roadmap that identifies the main areas of application for POE technologies and the developments necessary to achieve maximal performance and durability.
Reliability Assessment of Medium / Large Area PIN SI Photodiodes for Optical Wireless links for Intra – Spacecraft Communications
The Reliability Assessment of Area PIN SI Photodiodes was a exhibition theme in the First International Symposium on Reliability of Optoelectronics for Space that took place in Cagliari Italy , between May 11 – 14, 2009. INTA, the Instituto nacional de Técnica Aeroespacial in collaboration with Alter Technology Spain, exposed in this Symposium themes related to COTS in Space, Proton Radiation Tests and Reliability Assessment Tests giving general conclusions about Radiation and Reliability Assessment.
This paper describes the activities and results of an ESA-funded project concerned with the assessment of optical amplifier technologies and products for applications in fiber optic subsystems of future satellite payloads. On-board applications are briefly introduced, together with associated system-level requirements. Optical amplifier technologies, research achievements and products are reviewed. They are compared in terms of current performance, perspectives and suitability for the target space applications. Optical fibre amplifiers, not limited to Erbium-doped amplifiers, Erbium-doped waveguide amplifiers and Semiconductor Optical Amplifiers are covered
A dedicated evaluation and qualification campaign has been performed on several optical COTS components in order to use them on ESA’s SMOS mission. The evaluation phase consisted of a set of critical tests and analyses and led to the selection of the flight lot component. After selection of the components, one lot of each component has been qualified for the SMOS mission.