Abstract:
Systems and methods for operating, particularly in the field, a Raman spectroscopy device that includes a laser, a spectrograph, an intensified charge coupled device (ICCD), and an autofocus subsystem. Before spectral data acquisition commences a series of ancillary data checks is performed to monitor operating conditions of at least the laser, the ICCD, and the autofocus subsystem. Further, after each Raman spectrum acquisition, a series of data quality checks is performed to enhance confidence in the just collected data. Only spectral data that passes the data quality checks are further processed. However, all spectral data are stored in a log file. When the log file reaches a predetermined capacity, the log file is closed, and a new round of ancillary data checks is performed to again monitor the status of the Raman spectroscopy device.
Abstract:
The present invention describes a method for measuring the concentrations of species present at one point of a separation unit functioning in simulated moving bed mode (SMB), using an immersing probe located at one point in the unit or on one of the streams entering or leaving said unit, and a thermocouple located in the vicinity of the immersing probe, in which a Raman spectrum obtained using a laser source functioning at a wavelength of 785 nm is utilized.
Abstract:
A defect inspecting apparatus of the invention solves a problem that in a defect inspecting apparatus, because of improving detection sensitivity of a microscopic defect by reducing a detection pixel size, a focal depth becomes shallow, a height of imaging is varied due to environmental change and the detection sensitivity of a defect becomes unstable. This apparatus comprises an XY stage, which carries a substrate to be inspected and scans in a predetermined direction, and a mechanism having a system of irradiating a defect on the inspected substrate at a slant and detecting the defect by a detection optical system disposed on the upper side, which corrects a height of imaging in real time for change in temperature and barometric pressure in order to keep the imaging in a best condition.
Abstract:
A concentration determination apparatus may determine a concentration of a target component in an arbitrary layer of an observed object including a plurality of light scattering medium layers. The concentration determination apparatus may include an irradiation unit, light scattering medium layer selection unit, a light receiving unit, a light intensity acquisition unit, an optical absorption coefficient calculation unit, and a concentration calculation unit.
Abstract:
The invention relates to an optical probe for measuring absorption in order to produce an absorption value Am, which probe comprises an analysis cell CA, said analysis cell including an emission module LED, F1, HD and a detection module H1, D1 suitable for producing a detection signal DS, the probe also including a monitoring cell CM suitable for producing a monitoring signal MS. The monitoring cell is arranged on the light path connecting the emission module to the detection module.
Abstract:
Apparatus for remote laser-based detection of a analyte in a remote target region; comprising a reference container for housing a reference substance identical with the analyte; a laser unit which constituted to emit a laser beam of a tuneable wavelength towards the target region to be analysed and along a reference path which passes through the reference container for detecting the reference substance; a laser control means constituted to control wavelength of the laser beam during detection periods such that the laser wavelength is changed to allow detection of an optical absorption profile of the analyte during detection periods; an analytical detection unit which detects light from the target region and generates analytical signals during the detection periods, a reference detection unit which detects laser light passed through the reference container and generates reference signals during the detection periods; and an analysing means constituted to analyse the similarity of the analytical and reference signals or of one or more calculated functions respectively calculated from the analytical and reference signals for determining the concentration of the analyte in the target region.
Abstract:
An assembly determines an analyte concentration in a sample of body fluid. The assembly includes a test sensor having a fluid-receiving area for receiving a sample of body fluid, where the fluid-receiving area contains a reagent that produces a measurable reaction with an analyte in the sample. The assembly also includes a meter having a port or opening configured to receive the test sensor; a measurement system configured to determine a measurement of the reaction between the reagent and the analyte; and a temperature-measuring system configured to determine a measurement of the test-sensor temperature when the test sensor is received into the opening. The meter determines a concentration of the analyte in the sample according to the measurement of the reaction and the measurement of the test-sensor temperature.
Abstract:
A turbidity measurement system includes a sample assembly that contains a plurality of samples, a light source that illuminates the sample assembly, and a light detection system that includes a two-dimensional light-sensitive array. The light-sensitive array is simultaneously exposed to light transmitted through each of the samples in the sample assembly. The exposure is analyzed to determine a mean transmitted light intensity for each sample and to calculate a turbidity value for each sample based on its mean transmitted light intensity. Multiple exposures may be taken during a measurement period so as to obtain time-resolved turbidity measurements of the samples. The temperature of the samples may be varied during the measurement period so as to measure turbidity as a function of temperature.
Abstract:
A method and apparatus is provided for concentration determination of at least one component in an acid catalyst for hydrocarbon conversion containing an unknown concentration of an acid, an acid-soluble-oil (ASO), and water. An instrument configured for measuring a property of the acid catalyst, has responsivities to concentrations of one of the acid, ASO, and water, substantially independent of the concentrations of the others of the acid catalyst, ASO, and water. A temperature detector is configured to generate temperature data for the acid catalyst. A processor is configured to capture data generated by the temperature detector and the instrument, and to use the data in combination with a model to determine a temperature compensated concentration of the one of the acid, the ASO, and the water. Optionally, one or more other instruments configured for measuring other properties of the liquid mixture may also be used.