Abstract:
PROBLEM TO BE SOLVED: To provide a system minimizing influence of an external environment such as the outdoors and improving durability, in a detection/analysis system for a volatile substance contained in a breath sample of a subject. SOLUTION: The system includes at least one measurement cell 17, which is constructed to receive/discard the breath sample for exposing the breath sample to infrared beams, and at least one electronic signal processor 12. The measurement cell 17 includes at least one infrared light source 2 adjusted to a wavelength range of a specific absorption peak of the volatile substance, a plurality of reflection faces 4 for infrared collimation, at least one or more detectors 8 and 9 providing a plurality of electric output signals corresponding to infrared transmitted beams at a wavelength interval equivalent to an absorption peak, mechanical support structures 6 and 7 defining positions of the infrared light source, the reflection faces, and the detectors. The electronic signal processor 12 can analyze the electric output signal according to previously programmed information about the infrared absorption spectrum of the volatile substance. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
A light source and a method for its use in an optical sensor are provided, the light source including a resistively heated element. The light source includes a power circuit configured to provide a pulse width modulated voltage to the resistively heated element, the pulse width modulated voltage including: a duty cycle with a first voltage; and a pulse period including a period with a second voltage, wherein: the duty cycle, the first voltage, and the pulse period are selected so that the resistively heated element is heated to a first temperature; and the first temperature is selected to emit black body radiation in a continuum spectral range. Also provided is an optical sensor for determining a chemical composition including a light source as above.
Abstract:
Un analyseur compact de biochimie sèche sur échantillons sanguins intègre sur un même châssis (11): - une chambre de mesure (20) adaptée à recevoir un rotor consommable (13) comportant des micro-cuves (13A, 13B) contenant des réactifs secs, - un module de dilution numérique (21) à un ratio fixe ou variable défini en fonction de l'espèce de l'échantillon à analyser, - un module de centrifugation d'échantillon (12) adapté à assurer, à l'intérieur de la chambre de mesure, la centrifugation de ce rotor et son positionnement angulaire, - un module optique adapté à appliquer des faisceaux de lumière à des micro-cuves du rotor, ce module optique comportant une source lumineuse (14) du type flash-lamp et un capteur de lumière de référence (16), - un système électronique de traitement et de commande (23, 24, 25) comportant un lecteur de mémoire externe (26) adapté à lire une mémoire externe transportable (27) contenant au moins des informations caractéristiques d'au moins le rotor consommable en cours d'utilisation.
Abstract:
A radiation arrangement suitable for emitting IR radiation has a flat radiation source (2), the radiation emitted from which is deflected in at least one predetermined direction by a reflector (4); said reflector consists of a body, the circumference of which becomes smaller towards the beam outlet and the reflective surface of which is substantially surrounded by the radiation source; in an axisymmetrical arrangement, the distance between the radiation source and the axis of the reflected beam is greater than the radius of the reflector component arranged symmetrically in rotation along the optical axis. The radiation body may consist thereby of a resistive coating (2) on an electrically insulating substrate (3) or a self-supporting resistive strip or wire. An essential advantage here is that there is a relatively large area for the generation of IR radiation which can be bunched into a high-intensity beam by the reflector arrangement, as is necessary in measuring instruments, e.g. gas analysers.
Abstract:
An electrically modulated light source is provided. The electrically modulated light source comprises a carbon nanotube film structure. The electrically modulated light source heats up to a highest temperature and emits thermal radiation in less than 10 milliseconds after a voltage is applied, and the electrically modulated light source cools down to an initial temperature of the electrically modulated light source in less than 10 milliseconds after the voltage is removed. An modulation frequency of the electrically modulated light source is greater than or equal to 150 KHz. A non-dispersive infrared spectrum detection system used the electrically modulated light source, and a method for detecting gas used the electrically modulated light source are also provided.