Abstract:
A system and method are provided for detecting one or more substances. An optical path switch divides sample path radiation into a time of alternating first and second polarized components. The first polarized components are transmitted along a first optical path and the second polarized components along a second optical path. A first gasless optical filter train filters the first polarized components to isolate at least a first wavelength band thereby generating first filtered radiation. A second gasless optical filter train filters the second polarized components to isolate at least a second wavelength band thereby generating second filter radiation. Spectral absorption of a substance of interest is different at the first wavelength band as compared to the second wavelength band. A beam combiner combines the first and the second filtered radiation to form a combined beam of radiation. A detector is disposed to monitor magnitude of at least a portion of the combined beam alternately at the first wavelength band and the second wavelength band as an indication of the concentration of the substance in the sample path.
Abstract:
A method (500) for monitoring and/or controlling a pharmaceutical process includes obtaining (502) one-dimensional spectral data generated by a spectroscopy system (e.g., a Raman spectroscopy system), converting (508) the one-dimensional spectral data to a two-dimensional spectral data matrix, and applying the two-dimensional spectral data matrix to an input layer of a deep learning model (e.g., a convolutional neural network). The deep learning model predicts (410) a parameter (e.g., metabolite level) based on the two-dimensional spectral data matrix, e.g., in order to monitor and/or control a pharmaceutical process.
Abstract:
The invention relates to a photometer (30) for analysing the composition of a sample gas. The photometer comprises an infra-red (IR) source (20) configured to direct a first plurality of pulses (40) of IR radiation through the sample gas to an IR detector (26), at least two of the first plurality of pulses being of different wavelength. The photometer further comprises an ultraviolet (UV) source (32) configured to generate a second plurality of pulses (38) of UV radiation for conveyance to a UV detector (36), at least two of the second plurality of pulses being of different wavelength. A path selection arrangement (22, 42-50) is configured to selectively convey different ones of the second plurality of pulses (38) to one of the sample gas and the UV detector (36). The photometer further comprises processing circuitry coupled to the IR source (20), the UV source (32), the IR detector (26), the UV detector (36) and the path selection arrangement (22, 42-50). The processing circuitry is configured to (i) select the wavelength to be used for a given UV pulse of the second plurality of pulses (38), (ii) receive a plurality of detection signals from each of the IR detector (26) and the UV detector (36) and (iii) based on the detection signals, determine a concentration of at least one component of the sample gas. A method for analysing the composition of a sample gas is also disclosed.
Abstract:
Die vorliegende Erfindung betrifft eine Raman—Mikrospektrometer-Anordnung (100) umfassend eine Auflichteinrichtung (10), welche dazu ausgebildet ist, in aufrechtstehender Konfiguration oder in inverser Konfiguration im Betrieb der Raman—Mikrospektrometer-Anordnung verwendet zu werden und während einer Messung der Raman—Mikrospektrometer- Anordnung zwischen der aufrechtstehenden Konfiguration und der inversen Konfiguration umgeschaltet zu werden; und eine Gitterkomponenteneinrichtung (20), welche planare digitale Strukturen aufweist und welche dazu ausgebildet ist, als eine abbildende optische Komponente und/oder als eine dispergierende optische Komponente im Betrieb der Raman— Mikrospektrometer-Anordnung verwendet zu werden.
Abstract:
A shutter assembly for use with a spectrometer having at least one source of optical radiation such as at least one laser capable of generating an excitation light beam having an illumination path. The shutter assembly includes a shutter having at least one of (i) at least one calibration material capable of generating a consistent spectrum within wavelengths utilizable by the spectrometer and (ii) a mirror capable of diverting at least one of the illumination path and a collection path relative to a calibration standard capable of generating a consistent spectrum within wavelengths utilizable by the spectrometer. The shutter assembly further includes a mechanism capable of moving the shutter into at least a first position in the path of the light beam and a second position out of the path of the light beam to enable a sample to be analyzed. When the shutter is moved into the first position, at least one of (a) the light beam strikes the calibration material as desired yet remains blocked from further travel, (b) the light beam is diverted by the mirror to the calibration standard, and (c) the collection path is diverted by the mirror to communicate with the calibration standard while the illumination path is blocked.
Abstract:
Methods and designs for providing reduced sensitivity to mirror tilt in Fourier transform spectrometers are disclosed. According to an embodiment for two-directional tilt compensation, the FT spectrometer can include a beam splitter positioned to receive an incoming beam from a light source and split the incoming beam into a first sub-beam and a second sub-beam, a comer-cube retroreflector positioned to receive the first sub-beam from the beam splitter, a dual reflective mirror positioned to receive the first sub-beam from the corner-cube retroreflector at one surface and the second sub-beam at the other surface. An optical path delay can be created using a set of mirrors, tilting the beam splitter and/or a glass cube.
Abstract:
A system for predicting blood constituent values in a patient includes a remote wireless noninvasive spectral device (2) for generating a spectral scan of a body part of the patient. The system also includes a remote invasive device (1) and a central processing device (3). The remote invasive device (1) generates a constituent value for the patient, which the central processing device (3) predicts a blood constituent value of the patient based upon the spectral scan and the constituent value.
Abstract:
A boron carbide solid state neutron detector (10) includes a layer (12) of boron carbide wherein the boron carbide layer is an electrically active part of the detector. A sensing mechanism which may be inherent to the boron carbide layer detects changes in the boron carbide layer caused by the interception of neutrons. In a method of using the detector (10) a monitoring device coupled to the sensing mechanism records the detected changes.
Abstract:
Spectroscopic apparatus for sequentially detecting the presence of a plurality of elements in a sample. The apparatus includes a plurality of lamps (1a-1e) each of which is for detecting the presence of a respective at least one predetermined element in a plurality of elements. A beam selector (13) which may be a mirror, is operative to direct a beam of light (7) from any one of lamps (1a-1e) to an analysis zone (8). The apparatus includes a monochromator (15), the drive (24) of which is under the control of a controller (25) with a memory device (26) linked thereto. Predetermined settings for the monochromator corresponding to the peak settings for each wavelength of interest can be stored in memory (26) for subsequently driving the monochromator to those settings without the need to undertake a peaking routine for each elemental analysis, thereby saving analyses time. The lamp and beam selector arrangement of the apparatus substantially reduces the time required to change from one lamp to another thereby facilitating sequential spectroscopic multi-element analyses of samples. Apparatus which uses a flame for atomising a sample includes valves (19 and 20) for controlling the flow of oxidant (17) and fuel (18) gases to a spray chamber (23) and then analysis zone (8), the oxidant (17) being supplied via a nebuliser (22). The valves (19 and 20) are preferably high speed oscillating valves having an adjustable on to off time ratio under the control of a microprocessor (21). The oscillating valves (19 and 20) allow rapid changes to be made to the oxidant and fuel gas flows, thereby also saving analysis time.