Abstract:
The invention relates to a method for determining the temperature of an infrared-active gas by means of infrared spectroscopy, the method comprising: radiating infrared light in a spectral range of 700 cm -1 to 5000 cm -1 originating from an infrared light source onto the gas; obtaining a first absorption-related parameter originating from measuring a first infrared absorption band of the gas, wherein the first infrared absorption band is a hot band being caused by thermal population of at least one vibrational mode of the gas; obtaining a second absorption-related parameter originating from measuring a second infrared absorption band of the gas, and calculating a ratio between the first absorption-related parameter and the second absorption- related parameter. The method is characterized in that the ratio is used to determine the temperature of the gas, wherein the ratio has a relative change of at least 0.5 % per Kelvin temperature difference of the gas.
Abstract:
A method for measuring the profile of the content of a gas compound from a gas mixture. The method comprises generating a light beam (170) and guiding at least part of the light beam (170) to a first optical path (160) such that at least part of the photons of the light beam (170) travel the first optical path (160) in a first direction. The method further comprises generating at least a last light pulse (710, 710a); transforming, using at least the last light pulse (710, 710a), at least part of the gas compound (510) atoms, molecules, ions, or radicals, to at least a first part (520); selecting wavelength of the light beam (170) such that is corresponds to an absorption profile of the first part (520); guiding at least part of the a light pulse (710, 710a, 710, 710a, 710b, 710c) to the first optical path (160), such that the photons (515, 515b) of the guided part of the light pulse travel in a second direction, wherein the second direction is reverse to the first direction; detecting a first profile (I k (t)) indicative of the intensity of the attenuated light beam (175) as function of time; and determining, using the first profile (I k (t)) indicative of the intensity of the attenuated light beam (175) as function of time, the profile (ξG(x)) of content of the gas compound on the first optical path (160). In addition, a device arranged to perform the method.
Abstract:
A simple and compact apparatus, and a method, for determining the characteristics of a number of fluids used in the truck and automotive industries including coolant, bio- diesel, gas-ethanol and diesel engine fluid (DEF). The apparatus includes a sample container (26) providing optical paths of different lengths for making measurements on a sample. The dual path length design allows the apparatus to capture both NIR and UV spectral ranges. The qualitative and quantitative properties of the fluid under test are compared to test results under normal conditions or to the properties of unused fluid. Two light sources (64, 67) are used within a spectrometer with each source being associated with a different optical path length.
Abstract:
A system and process are disclosed that provide high accuracy and high precision destructive analysis measurements for isotope ratio determination of relative isotope abundance distributions in liquids, solids, and particulate samples. The invention utilizes a collinear probe beam to interrogate a laser ablated plume. This invention provides enhanced single-shot detection sensitivity approaching the femtogram range, and isotope ratios and particle assays that can be determined with relative precision better than about 2%.
Abstract:
Die Erfindung betrifft eine Messvorrichtung, eine Anordnung und ein Verfahren zur Messung eines Gehaltes an mindestens einer Komponente in einem flüssigen Kraftstoff. Der erfindungsgemäße Messvorrichtung weist auf: einen Gassensor (3) zur Ermittlung des Anteils einer gasförmigen Komponente in einer Gasphase (5) des Kraftstoffs (2) und Ausgabe eines ersten Messsignals (S1), und eine Auswerteeinheit (10) zur Aufnahme des ersten Messsignals (S1) und Ermittlung des Gehaltes der Komponente in dem flüssigen Kraftstoff (2). Ergänzend können der Druck und die Temperatur der Gasphase (5) gemessen werden. Erfindungsgemäß ist ein direkter Kontakt mit dem flüssigen Kraftstoff (2) nicht erforderlich.
Abstract:
An object (206) to be imaged or detected is illuminated by a single broadband light source or multiple light sources emitting light at different wavelengths. The light is detected by a detector (200), which includes a light-detecting sensor (400) covered by a hybrid filter. The hybrid filter includes a multi-band narrowband filter (516) mounted over a patterned filter layer (508). The light strikes the narrowband filter (516), which passes light at or near the multiple wavelengths of interest while blocking light at all other wavelengths. The patterned filter layer (508) alternately passes the light at one particular wavelength while blocking light at the other wavelengths of interest. This allows the sensor (400) to determine either simultaneously or alternately the intensity of the ligth at the wavelengths of interest. Filters (902) may also be mounted over the light at the light sources to narrow the spectra of the light sources.
Abstract:
A chemical sensor, such as a fiber optic chemical sensor, is self-calibrated by measuring two output values which behave differently in response to an analyte, and forming a ratio between the two measured output values to cancel out effects of variations in external factors such as temperature variations differences between coatings, light (illuminator) variations, fouling, bleaching, leaching or the like. An indicator material may be used which produces both fluorescence and phosphorence, both monomer and aggregate emission or absorption bands, emission or absorption bands with or without an isosbestic point, emission peaks at one wavelength at two different excitation bands, or emission peaks at two wavelengths for excitation at two wavelengths.
Abstract:
The present invention relates to a method for monitoring and control of smeltmetallurgical processes, endothermic as well as exothermic ones, preferably pyrometallurgical processes, by means of optical spectrometry, whereby one first determines for each endothermic and exothermic smeltmetallurgical process and/or process step characteristic emissions or absorptions and identifies the atomic or molecular origin of the emissions/absorptions, that one during a running process records changes in the characteristic emissions/absorptions and relates these changes to the condition of the process and with reference hereto controls the process.
Abstract:
This invention concerns the field of sample identification, in particular a method and apparatuses for identifying or discriminating biological species from non biological species, both as individual particles and as components of a composition, by pump-probe fluorescence spectroscopy for time-resolved detection or imaging. The method uses the finding that the UV-induced fluorescence of biological molecules is varied, in particular is depleted, by the addition of visible radiation, whereas this does not occur with non-biological organic molecules. The invention discriminates the fluorescence signals of bio and non-bio particles or species using a differential approach, i.e. the comparison. of the total fluorescence recorded with and without additional visible radiation. This allows to discriminate biological particles comprising aromatic amino-acids (AA), like peptides, proteins, bacteria, viruses, pollens, spores, etc., from non-biological particles, like aromatic (AH) or polyaromatic hydrocarbons (PAH), carbonaceous aerosols, soot, etc.