Abstract:
L'invention concerne une sonde optique, comportant une fibre optique (51) associée à une pointe conique (7), en saphir ou en diamant, de base (71) circulaire et comportant, entre la base et l'extrémité, une rainure annulaire (73) à fond (731) courbe ou au moins un épaulement de révolution. L'invention concerne également un procédé et un système de détermination de grandeurs caractéristiques d'un écoulement biphasique utilisant une telle sonde.
Abstract:
Techniques and apparatus inhibit, limit, or remove biofouling and certain inorganic accumulations, to increase the longevity of accurate in-situ oceanographic and other underwater measurements. The invention deters formation of an initial bacterial layer and other precipitation, without harming the environment. The invention integrates an ultrasonic source into a sensor or other device, or its supporting structures. The ultrasonic source vibrates one or more critical surfaces of the device at a frequency and amplitude that dislodge early accumulations, thus preventing the rest of the fouling sequence. The ultrasonic driver is activated for short periods and low duty cycles, and in some cases preferably while the device is not operating.
Abstract:
A multichannel fluorosensor includes an optical module and an electronic module combined in a watertight housing with an underwater connector. The fluorosensor has an integral calibrator for periodical sensitivity validation of the fluorosensor. The optical module has one or several excitation channels and one or several emission channels that use a mutual focusing system. To increase efficiency, the excitation and emission channels each have a micro-collimator made with one or more ball lenses. Each excitation channel has a light emitting diode and an optical filter. Each emission channel has a photodiode with a preamplifier and an optical filter. The electronic module connects directly to the optical module and includes a lock-in amplifier, a power supply and a controller with an A/D converter and a connector. The calibrator provides a response proportional to the excitation intensity, and matches with spectral parameter of fluorescence for the analyzed fluorescent substance.
Abstract:
Fluorimètre (10) submersible comprenant : - un module d'excitation (40) adapté pour exciter le fluorophore; et - un module de détection (42) adapté pour détecter de la lumière émise par le fluorophore excité, caractérisé en ce que le module d'excitation (40) comprend une première source de lumière (44) possédant une première LED UV et présentant une première longueur d'onde inférieure à 300 nm, et que le module d'excitation (40) comporte une deuxième source de lumière (46) possédant une deuxième LED UV et présentant une deuxième longueur d'onde inférieure à 300 nm, les première et deuxième longueurs d'onde étant différentes l'une de l'autre, et que le fluorimètre comporte un circuit électronique comportant une pluralité de circuits imprimés positionnés les uns en dessous des autres.
Abstract:
Die Erfindung bezieht sich auf ein Prozess-Analysegerät (10) zur Bestimmung eines Analyten in einer Analyseflüssigkeit (11). Das Analysegerät (10) besteht aus einem Basismodul (12) und einem austauschbaren Kartuschenmodul (14), wobei das Kartuschenmodul (14) aufweist: eine Probengewinnungsvorrichtung (16) mit einer Membran (18), zur Gewinnung eines Dialysats (20) aus der Analyseflüssigkeit (11), eine erste Pumpmimik (22) zum Pumpen einer Trägerflüssigkeit (24) von einem Trägerflüssigkeits-Vorratstank (26) zu der Dialysevorrichtung (16), eine zweite Pumpmimik (28) zum Einleiten eines Reagenzes (30) in die Probe (20), eine Messstrecke (32) zur quantitativen Bestimmung des Analyts in der Probe (20), eine Entgasungsvorrichtung (40) zum Entgasen der Probe (20), wobei die Entgasungsvorrichtung (40) hinter den beiden Pumpmimiken (22, 28) angeordnet ist.
Abstract:
Techniques and apparatus inhibit, limit, or remove biofouling and certain inorganic accumulations, to increase the longevity of accurate in-situ oceanographic and other underwater measurements. The invention deters formation of an initial bacterial layer and other precipitation, without harming the environment. The invention integrates an ultrasonic source (24) into a sensor or other device, or its supporting structures. The ultrasonic source vibrates one or more critical surfaces (12) of the device at a frequency and amplitude that dislodge early accumulations, thus preventing the rest of the fouling sequence. The ultrasonic driver is activated for short periods and low duty cycles, and in some cases preferably while the device is not operating.
Abstract:
An apparatus for performing real-time analysis of a subterranean formation fluid includes a light source configured to transmit at least a sample signal through a sample of the subterranean formation fluid and a reference signal, at least one photodetector configured to continuously detect the sample and reference signals, and an electronics assembly configured to compensate for drift in the detected sample signal in real-time based on the value of the detected reference signal.
Abstract:
A device is developed that is capable of automatically and continuously extracting fluid from a polymer-containing vessel and mixing this with a solvent such that the final fluid is dilute enough that single particle light scattering, spectrophotometric and other measurements can be made on it. Whereas many sampling and dilution devices exist, the novelty of this invention consists in its ability to deal with very high viscosities, including those laden with bubbles, and to introduce only a short delay time between sampling and measurement. The device is ideally suited for situations where the viscosity of the polymer-containing vessel changes over a wide range during the course of a reaction; e.g. polymerization, polymer degradation, aggregation, and others. Furthermore, provision is made for modular conditioning stages, such as changing solvent conditions, evaporating monomer, filtering, etc. The amount of sample actually withdrawn for measurement is very low, normally on the order of 0.25ml to 5ml per hour. The device can also vary the dilution factor either automatically or manually during operation.
Abstract:
In this way, plumes of oil and gas in the oceanic water column can be detected from a substantial distance using a highly sensitive sensor (2) and then characterized thoroughly using a less sensitive sensor (3).
Abstract:
A method and apparatus for characterising individual particles in an aquatic mass (24) is disclosed. According to a first aspect of the invention, an interference pattern (22) is generated in the aquatic mass (24) by overlapping two beams (10, 12) of electromagnetic radiation. The region of overlap defines a probe volume (14) such that the interference pattern (22) is generated in the probe volume (14). A single particle (26) in the probe volume is illuminated with the interference pattern (22), causing said single particle (26) to emit radiation. The radiation emitted by the single particle (26) is detected, and spectral data derived from the detected radiation is used to determine a property of the single particle. The emitted radiation may be fluorescence. According to a further aspect of the invention, a similar arrangement is used to illuminate a single particle so that the particle scatters radiation via Raman scattering. The Raman-scattered radiation is detected and used to determine a property of the single particle (26).