Abstract:
The present invention is directed toward the early detection of harmful algal blooms. The system employs the ability of whole cell non-contact micro Raman spectroscopy to detect cell pigmentation in such a way that distinct patterns or fingerprints can be assembled. Light field microscopy will provide a fundamentally innovative increase in image and sample volume. Furthermore, darkfield microscopy is employed to capture high-resolution, color images of the detected plankton to increase the accuracy of species identification and classification. Together, this new instrument will provide a powerful yet elegantly simple solution to detection of HAB cells and characterization of environmental conditions.
Abstract:
The invention is directed to a method for determining in situ and in real time at least one suspended sediment property in a medium, said suspended sediment comprising a mineral and an organic fraction. Said method comprises the steps of (a) measuring light absorbance with a submersible ultraviolet-visible spectrometer, said ultraviolet-visible spectrometer being configured to analyse to analyse light absorbance at wavelengths which are comprised between 220 nm and 730 nm and of (b) correlating the light absorbance to the properties of said suspended sediment, preferentially by using the Beer-Lambert's law. Said method is remarkable in that said step (b) is performed by using one model calibrated for deriving said properties of said suspended sediment from said light absorbance.
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 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:
A circularizated semiconductor laser diode (CSLD), such as for example a vertical cavity surface emitting laser (VCSEL) may be used for optical measurements. The CSLD may be used in a cell density probe to perform cell density determination and/or turbidity determination, such as in a biotech, fermentation, or other optical absorbance application. The cell density probe may comprise a probe tip section made from a polytetrafluoroethylene material, which provides sealability, ease of manufacture, durability, cleanability, optical semi-transparency at visible and near infrared wavelengths, and other advantages. The probe tip advantageously provides an optical gap that allows for in situ measurements of optical measurements including but not limited to absorbance, scattering, and fluorescence.
Abstract:
Die Erfindung betrifft einen Sensorkopf für ein Unterwasserfahrzeug mit einer Probenkammer, mit einer der Probenkammer zugeordneten Lichtquelle und einem der Probenkammer zugeordnetem Spektrometer und einer zugeordneten Optik, sodass ein Spektrum, insbesondere Raman-Spektrum und/oder IR-Spektrum, einer Probe im Probenraum ermittelbar ist, wobei der Probenraum eine Zuführeinrichtung aufweist, wobei die Zuführeinrichtung ein Probennahmeelement und eine Probenzuleitung aufweist.
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:
Ringleuchten werden als Objektbeleuchtung zur gleichmäßigen, schattenfreien und intensiven Ausleuchtung beispielsweise an Kameras und Mikroskopen eingesetzt. Ringleuchten mit nach innen abstrahlenden Lichtquellen als ringförmige Leuchtstofflampen und ringförmig angeordnete Leuchtdioden sind bekannt. Das Licht wird jedoch nicht auf ein scharf begrenztes Volumen fokussiert. Die erfindungsgemäße Ringleuchte (RL) erzeugt eine in allen drei Dimensionen scharf begrenzte Lichtscheibe (LS), indem sie das Licht (LL) der Lichtquelle (LQ) mit Hilfe einer zylinderförmigen Fresnellinse (FL) gleicher Länge exakt in Richtung ihrer Radialebene (RE) fokussiert. Eine ringförmige Aperturblende (AB) im Strahlengang unterstützt diese Begrenzung. Die Lichtquelle (LQ) kann von einem druckfesten Gehäuse (DG) umgeben und so zum Unterwassereinsatz in der Anwendung in einem Partikel-Detektionssystem geeignet sein, wobei das Gehäuse gleichzeitig Lichtstreuung in die Umgebung der Lichtscheibe (LS) vermeidet. Die Dicke der Lichtscheibe (LS) ist nur von der Länge der Abstrahlfläche (AF) der Lichtquelle (LQ) und der Fresnellinse (FL) abhängig und kann für die genaue Abbildung von Partikeln sehr dünn, d.h. im Bereich der Dicke der größten zu erwartenden Partikel gehalten werden.
Abstract:
In-situ technique for automatically verifying proper operation of a photometric device, such as a cell density probe (CDP). In one embodiment, the CDP comprises a first detector and a second detector. The first detector (226) senses light transmitted from a light source of the CDP. The second detector (210) senses light passed through an optical gap (106) at a tip of the CDP, wherein the sensed light has been reduced in intensity due to light absorption. Electrical current provided to the light source is reduced, and the resultant values of a light characteristic (such as intensity) at the first and second detectors are sensed. Values from the detectors are compared against one or more predicted values. For proper CDP operation, the detector values are consistent with the predicted values. If there is a malfunction in the CDP, the detector values are inconsistent with the predicted values.