Abstract:
A control apparatus includes a data acquiring unit configured to acquire a measured signal obtained by measuring light emitted from a test object onto which light is irradiated, a processing unit configured to calculate an objective function that varies in accordance with a statistical value obtained by statistically processing the measured signal, and a controller configured to control a modulation amount of a wavefront of the light irradiated onto the test object so as to minimize the objective function.
Abstract:
The disclosure relates to a system and method for analyzing a gaseous sample extracted from a drilling fluid coming from a wellbore. The system comprises a surface assembly, situated outside of the wellbore and including: an extractor for extracting a gaseous sample from the drilling fluid, a quantification device connected to the extractor for quantifying at least a gaseous constituent contained the gaseous sample. The quantification device comprises at least a photoacoustic cell in fluid communication with the extractor, at least a light source for emitting a light beam at a predetermined emission spectrum in the photoacoustic cell, at least an acoustic detector positioned in the photoacoustic cell and a processor for calculating a parameter relative to the quantity of the gaseous constituent on the basis of a signal obtained from the detector.
Abstract:
A method for identifying a target polymer (20) comprises translocating a target polymer (20) having detectable elements (22), such as fluorophores (22), through an analysing device (24) comprising a nanopore (28) having a detection window (40), wherein the analysing device (24) is capable of plasmon resonance to produce a localised electromagnetic field which defines the detection window (40) detecting the detectable elements (22) as they pass through the detection window (40) to produce a distribution profile of the detectable elements (22) along the target polymer (20) and identifying the target polymer (20) by comparing the distribution profile to a reference set of distribution profiles for known polymers. In a preferred embodiment the target polymer (20) is a nucleic acid and the detectable elements (22) are oligonucleotides complimentary to at least two adjacent nucleotides therein. Exemplified is the use of 6-mer oligonucleotides.
Abstract:
A device for determining the composition of a mixture of fluids by spectral absorption, comprises: a radiation source; a detector for detecting radiation that has been attenuated by the mixture; and a device for separating the radiation into a wavelength band corresponding to an absorption band of one of the fluids, a wavelength band corresponding to an absorption band of another of the fluids, and at least one reference wavelength band substantially adjacent to each of the absorption bands, and especially adjacent to each side of the absorption band or group of absorption bands. The device may be used to determine the composition of mixtures of oil, water and gaseous hydrocarbons in oil wells where there is a very large degree of time varying scattering e.g. Rayleigh and Mie scattering due to turbulence.
Abstract:
A gas concentration-measuring device makes it possible to measure gas components in a gas sample. An interferometer, based on a dual-band Fabry-Perot interferometer (1), is provided with a transmission spectrum that can be set by a control voltage (38). The control voltage (38) of the dual-band Fabry-Perot interferometer (1) is synchronized over the course of time with the activation and deactivation of the radiation sources (11, 12).
Abstract:
In a coated or uncoated film, variations in thickness as well as all possible casting errors may be dependably determined and evaluated, in that two light sources transmit modulated IR light wherein the modulation frequencies are different, wherein one light source transilluminates the film, while the other light source is arranged on the other side of the coating carrier, illuminates the latter obliquely and both the transilluminating and the reflected light bundles are conducted to a photo-receiver. The current signal arising in the photo-receiver is transformed into a current signal, amplified and feeds two electronic filters circuited in parallel, which free the signals from their modulation frequency, after which both signals are separately rectified. Subsequently the signal originating from the transmitted light portion is delogarithmized and forms a statement concerning the thickness of coating, while the light originating from the reflected portion evaluates surface errors. In this manner a separate evaluation of both kinds of error is possible.
Abstract:
This disclosure relates to a method for measuring the concentrations of sugars in liquids by the use of near infrared as well as an apparatus for practicing said method.The method comprises a step wherein the absorption spectrum of the sugar under investigation existing at a first depth relatively close to the surface in a sample is computed by using relatively weak power of near infrared, a step wherein the absorption spectrum of the sugar under investigation existing at a relatively deep second depth in the sample is computed by using relatively strong power of infrared, and a step wherein the concentration of the sugar under investigation in the sample is determined by computing the absorption spectrum of the sugar at a different depth between said first and second depths on the basis of the results of measurement in said first and second steps. The wavelengths for the use for said absorption spectrum are selected from anyone of wavelength bands of 950-1,150 nm, 1,150-1,300 nm, and 1,300-1,450 nm.Since, according to this method, wavelengths which are shorter and closer to the visible region than in the prior art are used, the method enables the measuring light beams to penetrate deeper in a living tissue and makes it possible to measure the concentrations of sugars existing in a deeper region non-invasively.
Abstract:
A device and method for measuring blood characteristics and parameters, especially arterial, venous, or differential blood oxygen saturation levels uses one or two probes containing a unique configuration of light emitters of two different wavelengths, and sensors which alternately illuminate and read reflected light from blood passing through a specially-designed cuvette. Electronic comparison of reflected radiation received by the probes produces a voltage which is linearly related to blood oxygen saturation level. An opto-electronic feedback network compensates for differences in blood optical density.
Abstract:
A device for determining the composition of a mixture of fluids that flow along a pipe, which comprises: a radiation source for illuminating the mixture with radiation; a detector for detecting radiation that has been attenuated by the mixture; a device for monitoring the flow rate of fluid along the pipe and outputting a signal indicative of the flow rate. The device includes a device for adjusting the intensity of radiation emitted by the radiation source in response to the signal indicative of the flow rate so that the intensity of the radiation source is reduced if the flow rate reduces.