摘要:
Device for detection of a light modifying target substance, the device comprising at least one optical fiber (1) with a front surface (4), the front surface (4) comprising a biosensor that is adapted to contact the target substance, and a device for measuring interference signals (6), the device being positioned in the beam reflected by the front surface (4) in order to detect an interference signal modified by the target substance in contact with the biosensor.
摘要:
The present invention relates to the use of reversible dimerization of methylene blue (MB) for sensing humidity. The invention preferably uses titanate nanowires coated with MB. The self-organizational properties of MB on the surface of this nanostructured material studied by spectroscopic means revealed that the light absorption properties of the MB molecules are humidity dependent. Based on the observed humidity dependent metachromasy, we fabricated a humidity sensor using optical fiber technology which is adapted for medical, industrial or environmental applications. The sensor operates with excellent linearity over the relative humidity (RH) levels ranging from 8 to 98%. The response and recovery time can be reduced to 0.5s while the device exhibits excellent reproducibility with low hysteresis. These performances allow the implementation of the sensor in a breathing monitoring system. Furthermore, the metachromasy was observed for other dyes. This calls for a detailed study of molecular configuration on functional surfaces since it can substantially modify the sensitization efficacy of dyes, e.g. in light conversion.
摘要:
A sensor (1) has a light conductor (2) having a grating (FBG), a cavity (5), and a transparent cavity end wall (4), a light emitter for directing light through the conductor, and a light detector for detecting reflected light, and a processor. The processor is adapted to analyse light reflected due to the grating (FBG, 6) to determine an indication of temperature, light reflected from the end (7) of the cavity (5) to determine an indication of pressure, and also light reflected from the outer surface (8) of the cavity wall (4) to determine an indication of refractive index of a medium outside said cavity wall. The processor may use one output to compensate another, for example pressure and temperature may be used to compensate for variation in refractive index.
摘要:
The fiber optic probe (7) comprises: a first optical fiber (9) to convey an electromagnetic radiation towards a measuring area at an exit end of said first optical fiber (9); a second optical fiber (11) to collect an electromagnetic radiation from said measuring area, the second optical fiber comprising an entrance end arranged in the measuring area and adjacent to the exit end of the first optical fiber. The exit end of the first optical fiber and the entrance end of the second optical fiber (11) are treated so that at least part of the electromagnetic radiation conveyed along the first optical fiber exits laterally from the first optical fiber and enters laterally in the second optical fiber. Moreover, in the measuring area an indicating material (15) is arranged, indicating a parameter to be measured with the probe. The radiation exiting from the first optical fiber passes through the indicating material so that the radiation collected by the second optical fiber is modulated by the indicating material (15).
摘要:
Dispositif (100) de conversion non-linéaire d'un premier signal infrarouge en un deuxième signal infrarouge de longueur d'onde inférieure à celle du premier signal infrarouge par mélange à quatre ondes, comportant au moins une portion de SiGe (108) disposée sur au moins une première couche (102) de matériau d'indice de réfraction inférieur à celui du silicium, une concentration en germanium dans la portion de SiGe variant de manière continue entre une première valeur et une deuxième valeur supérieure à la première valeur selon une direction sensiblement perpendiculaire à une face (103) de la première couche sur laquelle la portion de SiGe est disposée, et dans lequel une partie sommitale (112) de la portion de SiGe au niveau de laquelle la concentration en germanium est égale à la deuxième valeur est en contact avec un gaz et/ou un matériau (202) d'indice de réfraction inférieur à celui du silicium.
摘要:
Die Erfindung betrifft eine Messvorrichtung, insbesondere für eine Schlauchbeutelverpackungsmaschine 1, zur Bestimmung der Konzentration zumindest eines Gases innerhalb einer zu verschliessenden Verpackung 2, wobei über eine Gaslanze 3 ein Schutzgas in die zu verschliessende Verpackung 2 einführbar ist. Die Messvorrichtung umfasst einen Indikator 4, einen Lichtleiter 5 und eine Auswerteeinheit 6, wobei der Indikator 4 aus einem fluoreszierenden Material, vorzugsweise einem Polymermaterial besteht und am Ende des Lichtleiters 5 und innerhalb der zu verschliessenden Verpackung 2 angeordnet ist, wobei die Auswerteeinheit 6 zur Bestimmung der Konzentration des zumindest einen Gases ein optisches Signal des Indikators 4 über den Lichtleiter 5 aufnimmt und auswertet.
摘要:
Disclosed herein are methods and devices for detection of bacterial HAI. Disclosed methods may be utilized for continuous in vivo monitoring of a potential bacterial infection site and may be utilized to alert patients and/or health care providers to the presence of pathogenic bacteria at an early stage of infection. Disclosed methods include utilization of recombinant bacteriophage to deliver to pathogenic bacteria a translatable genetic sequence encoding an optically detectable marker or an enzyme capable of producing an optically detectable marker. Upon detection of the optical signal produced by the marker, medical personnel may be alerted to the presence of pathogenic bacteria at the site of inquiry. Any bacterial causative agent of HAI may be detected according to disclosed methods.