摘要:
Described herein are devices, systems, and methods for determining the composition of liquids, including the identity of one or more drugs in the liquid, the concentration of the drug, and the type of diluent using immittance spectroscopy. These devices, systems and methods are particularly useful for describing the identity and, in some variations, concentration of one or more components of a medical liquid such as intravenous fluid. In particular, described herein are devices, systems and methods that may operate in low ionic strength diluents. Also described are methods of recognizing complex immittance spectrograph patterns to determine the composition of a liquid by pattern recognition.
摘要:
La présente invention concerne, de façon générale, le domaine de l'analyse par exemple l'analyse biologique. Plus spécifiquement, la présente invention concerne une procédé détection, d'au moins un microorganisme présent dans un échantillon placé dans un conteneur fermé, ladite méthode comprenant essentiellement les étapes suivantes; a) Mettre en contact dans le conteneur, ledit échantillon, un milieu de culture et un support apte à capturer le ou les microorganismes à détecter, b) Fermer le conteneur, c) Placer le conteneur dans des conditions aptes à permettre la croissance du ou des microorganisme(s), d) Détecter à l'intérieur dudit conteneur fermé, à l'aide d'un moyen de détection, la présence du ou des microorganisme(s) fïxé(s) sur le support de capture.
摘要:
A method for determining a concentration of at least one component of milk includes measuring impedance values between two electrodes associated with a cell containing a milk sample at each of at least three frequencies, and estimating a concentration of the at least one component from a polynomial expression in which the impedance values at the at least three frequencies are variables. A system for determining a concentration of at least one component of milk includes a sampling cell including a milk sample, electrodes operative to electrify the milk sample with excitation signals at a plurality of frequencies including at least three frequencies, a signal generator for generating the excitation signals, circuitry for determining a relationship between an amplitude and phase of reflected and incident signals obtained from the signal generator, and a processor that receives the relative amplitude and phase and estimates a concentration of at least one component of milk based on a polynomial expression relating measured impedance values at a plurality of frequencies to concentrations of at least one component of milk.
摘要:
Described herein are devices, systems, and methods for determining the composition of fluids, and particularly for describing the identity and concentration of one or more components of a medical fluid such as intravenous fluid. These devices, systems and methods take multiple complex admittance measurements from a fluid sample in order to identify the identity and the concentration of components of the fluid. The identity and concentration of all of the components of the solution may be simultaneously and rapidly determined. In some variations, additional measurement or sensing modalities may be used in addition to admittance spectroscopy, including optical, thermal, chemical, etc.
摘要:
Apparatus, systems and methods related to monitoring intravenous fluids during administration to a subject are disclosed. These apparatus, systems and methods provide near real-time monitoring of the identity of one or more components of an intravenous fluid.
摘要:
The present invention relates to methods and systems or apparatuses for analyzing fluids. More particularly the present invention relates to apparatuses and methods that employ impedance spectroscopy (IS) for analyzing fuels. Fuels of interest include biofuel, particularly biodiesel. Hand-held and "in-line" IS apparatuses are disclosed.
摘要:
The present invention relates to methods and systems or apparatuses for analyzing fluids. More particularly the present invention relates to apparatuses and methods that employ impedance spectroscopy (IS) for analyzing fuels. Fuels of interest include biofuel, particularly biodiesel. Hand-held and "in-line" IS apparatuses are disclosed.
摘要:
A method and apparatus evaluating and improving the properties of fluid formulations is disclosed. The method and apparatus employ impedance spectroscopy (IS) measurements and data analyses to determine IS parameters for fluids representative of fluid formulation. Correlations are determined between the IS parameters and the properties of the fluids, and a modified or new fluid formulation is produced based on these correlations. IS measurements at three or more frequencies are made using probe electrodes in contact with fluids representative of a fluid formulation. The IS data are analyzed uring statistical techniques, equivalent circuit modeling techniques, or a combination thereof. The data analysis provides at least one IS parameter indicative of at least one fluid property for the fluids. At least one correlation is determined between one or more IS parameters and one or more properties of the fluids. A new fluid formulation is developed, responsive to correlations between the IS parameters and the properties of the fluids.
摘要:
1. A method of monitoring fluid condition in situ comprising: (a) measuring and recording the temperature T o of the fluid; (b) disposing electrodes (11,12) in the fluid (16) and exciting one electrode (11) with an alternating current voltage (20) and sweeping the frequency (39) thereof over a certain range. (c) measuring the current (40) in a second electrode (13) and computing the reactance (Z') and resistance (E) (42) at a plurality of predetermined intervals of frequency in the range; (d) determining the frequency (F r um ) (48) in said range associated with the minimum value of reactance; (e) repeating steps a - d for a predetermined number of temperature intervals over a selected range of temperatures (50) and compiling a database of values of F F r ., (52) for each temperature interval in the range; (f) measuring the fluid temperature (T 1 ) and determining F F L, J by interpolation from the database (54); (g) exciting one electrode with an alternating current voltage at a frequency less than F T C (56) and measuring the current in a second electrode and computing the electrode interfacial impedance Z, (59) and computing the impedance difference (AZ a Z S - Z w o (60); and, (h) determining the fluid condition by interpolation from a database of values of known fluid condition Y' versus AZ (66).
摘要:
Impedance spectroscopy is used to determine values associated with properties of a substance such as a fluid. In some embodiments, the present invention is applied to engine lubricants. A spectral matrix is constructed that comprises data taken from spectral plots. Also constructed is a result matrix comprising known quantities of a plurality of fluid constituents. A known analytic technique is performed on the spectral matrix to identify at least one principal component having significant influence on the spectral matrix. A reduced spectral matrix, wherein each column in the reduced spectral matrix is associated with a principal component having significant influence on the spectral matrix, is next created. A statistical technique uses the reduced spectral matrix and the result matrix to create at least one prediction equation. The prediction equation is used to predict at least one property in a second substance in situ.