The analysis of the quality of food oils is of paramount importance, because the degradation of oils can lead to formation of harmful substances to the human organism. With the increase of the degradation of oils an increase of its... more
Fluorescence lifetime measurement is used in biological research to enhance the contrast of fluorescence images. The outstanding sensitivity that can be achieved with this method is obtained at the expense of a high data throughput. A... more
Mapping of suspended particulate matter can be achieved through satellite-based optical sensors and has growing applications for understanding sediment transport. A suspended particulate matter algorithm developed by Nechad (2010) for... more
Linear accelerations measurements are needed in many applications, as industry, military, aircrafts, space navigation, robotics and others. Actually, the most usual solutions to measure linear accelerations are three piezoelectric sensors... more
Precise and continuous ethylene detection is needed in various fruit storage applications. The aim of this work is the development of a miniaturised mid-infrared filter spectrometer for ethylene detection at 10.6 µm wavelength. For this... more
We present an optical gas sensor based on the classical nondispersive infrared technique using ultracompact photonic crystal gas cells. The ultracompact device is conceptually based on low group velocities inside a photonic crystal gas... more
This paper presents a method to determine the 2D profile and velocity of an object on a moving conveyor from a lateral optical sensor that consists of an orthogonal pair of line array (LA) scanners. Unlike most LA scanners which are... more
This paper is devoted to the description and characterization of a new electro-optic sensor based on a polarimetric device operating in reflection mode, and on a closed-loop controller. The main features of the proposed sensor are... more
Small size fiber optic devices integrated with chemically sensitive photonic materials are emerging as a new class of high-performance optical chemical sensor that have the potential to meet many analytical challenges in future clean... more
This paper presents the design and implementation of a perceptual system for the mobile robot using modern sensors and multi-point communication channels. The data extracted from the perceptual system is processed by a sensor fusion model... more
Monitoring human pressures is the first step in the management of natural ecosystems, as well as a method to evaluate the effectiveness of the applied conservation measures. In this context, five commercial satellite images (QuickBird... more
Novel nanostructured materials, such as aluminum oxide (AlOOH), silicon oxide (SiO 2 ) or zirconium oxide (ZrO 2 ) embedded into PVA, were investigated as potential matrices to incorporate organometallic compounds (OMCs) for the... more
Novel optical sensing films for oxygen based on highly luminescent iridium (III) and ruthenium (II) complexes have been developed. These demonstrate excellent long-term photostability (several months) when incorporated into polystyrene... more
Novel nanostructured materials, such as aluminum oxide (AlOOH), silicon oxide (SiO 2 ) or zirconium oxide (ZrO 2 ) embedded into PVA, were investigated as potential matrices to incorporate organometallic compounds (OMCs) for the... more
The possibility of the use of the nonlinear Faraday effect for optical limitation of the laser power is investigated in a resonant Faraday medium placed between two crossed polarizers. The results are comparable with those obtained at... more
In this paper, we describe a closed-loop pathological tremor attenuation system using Functional Electrical Stimulation (FES). The proposed strategy, which is based on the modulation of joint impedance using FES, was developed after... more
Type IV Composite overwrapped pressure vessels (COPVs) are commonly used in high-pressure environments such as aerospace, automotive, and industrial sectors. The COPV Type IV vessels are characterized by their nonmetallic liner, which is... more
Vital signal monitoring acts as a highly significant diagnostic method. Continuous monitoring of vital signs like temperature, heart rate, and blood pressure aids in easy and fast disease diagnosis. Existing methods that enable continuous... more
The ESA project GlobSnow develops products and services for snow extent and snow water equivalent. The time series of Snow Extent (SE) products will cover the whole seasonally snow-covered Earth for the years 1995-2010 based on the... more
There is considerable interest in developing chemical sensors for detection of trace explosives. Optical sensors, which rely on the change in optical properties of the material, proved to be very effective. Therefore, there is a need to... more
The potential for buildup .of formaldehyde in closed space environments poses a direct health hazard to personnel. The National Aeronautic Space Agency (NASA) has established a maximum permitted concentration of 0.04 ppm for 7 to 180 days... more
A very sensitive and reversible optical chemical sensor based on dithizone as chromoionophore immobilized within a plasticized carboxylated PVC film for Zn 2+ determination is described. At optimum conditions (i.e. pH 5.0), the proposed... more
Recently proposed new method "Ethanol as Internal Standard" for determination of volatile compounds in alcohol products by gas chromatography is investigated from different sides. Results of experimental study from three different... more
This article reports the synthesis and the properties of 5,11,17,23-tetra(t-butyl)-25,27-bis-(ethoxy-1,8-naphthalimide)-26,28-hidroxy-calix[4]arene and the formation of an inclusion compound in organic medium. This functionalized... more
Flood monitoring was conducted using multi-sensor data from space-borne optical, and microwave sensors; with cross-validation by ground-based rain gauges and streamflow stations along the Indus River; Pakistan. First; the optical imagery... more
In this work, we analyze a remote optical sensor system composed of two Fiber Bragg Gratings (FBGs) and one Long Period Grading (LPG) capable of simultaneously sensing the temperature and the refractive index, separated by 50 km from the... more
Due mainly to the fact that fibre-optic sensors are typically more expensive than conventional electronic sensors, fibre-optic sensing remains a somewhat obscure field. Fibreoptic sensors do have significant advantages such as... more
It is possible to dramatically improve the performance, reliability, and maintainability of vehicles and other similarly complex equipment if improved sensing and diagnostics systems are available. Each year military and commercial... more
California chaparral ecosystems are cxccplionally fire adapted and typically arc subject to wildfire at dccadal to century frequencies. The hot dry Mediterranean climate summers and the chaparral communities of the Santa Monica Mountains... more
The paper discusses an inductive microsensor system for displacement measurement comprising microtransformers. The primary windings of the microtransformers are excited with an AC source with a frequency of several MHz. The... more
We have fabricated a multislotted optical nanoresonator with several spatial field distributions which are all addressable by the wavelength. The reported structure consists in an array of evanescently coupled single mode photonic crystal... more
Due to the remarkable properties of chalcogenide (Chg) glasses, Chg optical waveguides should play a significant role in the development of optical biosensors. This paper describes the fabrication and properties of chalcogenide fibres and... more
Many satellite-borne image data have been acquired in the Arabian Gulf since the mid 80's by different space agencies and have demonstrated oil spill related features at sea. Severe oil spills were caused occasionally by accidental... more
ESA currently builds the airborne hyper-spectral push broom imaging spectrometer APEX (Airborne Prism EXperiment) operating in the spectral range from 380 to 2500 nm. In the scope of the APEX project a large variety of characterization... more
There has been growing interest in the use of terahertz (THz) quantum cascade lasers (QCLs) for sensing applications. However, the lack of compact and sensitive THz detectors has limited the potential for commercial exploitation of... more
We present experimental results on the controlled vertical flight of a flapping-wing flying microrobot, in which for the first time an on-board sensing system is used for measuring the microrobot's altitude for feedback control. Both the... more
The design of autonomous robots involves the development of many complex, interdependent components, including the mechanical body and its associated actuators, sensors, and algorithms to handle sensor processing, control, and high-level... more