Abstract:
Imaging spectrometers can be used to generate hyperspectral images for medical diagnoses, contaminant detection, and food safety inspections, among other applications. An exemplary imaging spectrometer includes an integrated position sensing array that measures the relative positions of the interferometer components based on an interference pattern generated by illuminating the interferometer with a reference beam. Such an imaging spectrometer includes a processor that controls the interferometer component position by actuating a voice coil and several piezo-electric elements to align the components with respect to each other and to provide a desired optical path length mismatch between the interferometer arms. In some cases, the processor may use feedback and feed forward control, possibly based on the actuators transfer functions, for more precise positioning. The processor may also implement adaptive and recursive spectral sampling to reduce the image acquisition period.
Abstract:
Disclosed are systems and methods for actively controlling the temperature of an integrated computational element used in an optical computing device in order to affect its performance. One method includes providing an integrated computational element configured detect a characteristic of a substance and provide a transmission profile via a detector corresponding to the characteristic, and controlling a temperature of the integrated computational element in order to maintain the transmission profile within an optimal operating range.
Abstract:
An optical pressure sensor is disclosed having a pressure sensing optical cavity. A temperature sensing optical cavity at the sensor head is used by an interrogator to correct a pressure signal for effects of temperature. The optical cavities may be, for example, Fabry Perot cavities in the sensor head.
Abstract:
A Raman head is provided capable of operating at high surrounding pressures. The Raman head has housing having a first, sealed chamber filled with an incompressible liquid and a second chamber that is open to the surrounding environment. At least one bellows can be used to equalize pressure between the first sealed chamber and the surrounding environment. A planar side of a pair of plano-concave lens is positioned within the first chamber and the concave side of each plano¬ concave lens is positioned within the second chamber of the Raman head. Light emitted as a result of a laser beam in communication with the pair of plano-concave lens can be analyzed by a Raman analyzer.
Abstract:
Devices, methods and systems for making optical measurements of a fluid at elevated pressures and temperatures are disclosed. A cell is designed for the optical spectroscopic measurements of fluids or gas using light from ultra violet (UV) to far infrared wavelengths, among other wavelengths. A cell is described that is well suited for applications using very small fluid volumes, on the order of micro liters, such as microfluidic systems. Some described embodiments are suited for very high pressure and temperature environments (for example, 20kpsi or greater at 175 degree C or greater). Such conditions, for example, may be found in oilfield downhole environments. Some embodiments provide are inexpensive, and make use of replaceable lenses that are used as a pressure barrier and for collimation of the optical beam path for spectroscopic measurements.
Abstract:
Die Erfindung betrifft eine Vorrichtung zur extrakorporalen Blutbehandlung mit einem Dialysator (10), der durch eine semipermeable Membran (11) in eine erste und zweite Kammer geteilt ist, wobei die erste Kammer (12) in einem Dialysierflüssigkeitsweg angeordnet ist und die zweite Kammer (13) mittels einer Blutzuführleitung (14) und einer Blutabführleitung (15) mit dem Blutkreislauf eines Patienten (1) verbindbar ist, einem Zulauf (20) für frische Dialysierflüssigkeit, einem Ablauf (30) für verbrauchte Dialysierflüssigkeit, einer in dem Ablauf (30) angeordneten Messeinrichtung (40) zur Bestimmung der Absorption der durch den Ablauf (30) fließenden verbrauchten Dialysierflüssigkeit, wobei die Messeinrichtung (40) wenigstens eine Strahlungsquelle (41) für im Wesentlichen monochromatische elektromagnetische Strahlung sowie ein Detektorsystem (42) zur Detektion der Intensität der elektromagnetischen Strahlung aufweist, wobei Mittel (50) vorgesehen sind, um auftretende Änderungen der Intensität der elektromagnetischen Strahlung der Strahlungsquelle (41) und/oder der Empfindlichkeit des Detektorsystems (42) zu kompensieren.