Abstract:
Gas measurement detectector configured to monitor a level of a gaseous molecular species within a flow path (18) of a flow of breathable gas that communicates with an airway of a subject is performed by infrared spectroscopy. Rather than using an individual source (20) to generate electromagnetic radiation at reference and measurement wavelengths, a near-infrared electromagnetic radiation source (22) is used to generate reference electromagnetic radiation. The detector comprising: a first source (20) configured to emit mid-infrared electromagnetic radiation; a second source (22) configured to emit near-infrared electromagnetic radiation; source optics (24) configured to combine mid-infrared and near-infrared electromagnetic radiation emitted by the first and second source into a coaxial beam, and to direct the coaxial beam across the flow path (18); sensor optics (38) configured to receive electromagnetic radiation in the coaxial beam that has traversed the flow path (18), and to divide the received electromagnetic radiation into first radiation that includes mid-infrared electromagnetic radiation and second radiation that includes near-infrared electromagnetic radiation; a first radiation sensor (40) configured to receive the first radiation, and to generate output signals conveying information related to a parameter of the mid-infrared electromagnetic radiation in the first radiation; a second radiation sensor (42) configured to receive the second radiation, and to generate output signals conveying information related to a parameter of the near-infrared electromagnetic radiation in the second radiation; and a processor (36) configured to determine a level of a gaseous molecular species within the flow of breathable gas in the flow path based on the output signals generated by the first radiation sensor (40) and the second radiation sensor (42) such that the output signals generated by the second radiation sensor (42) are implemented to compensate optical loss through the flow path. Preferably fluctuations in irradiance of the source (20) generating the electromagnetic radiation at the measurement wavelength is compensated for based on a measurement of resistance through the source (20).
Abstract:
The present disclosure provides a method of providing a hyperspectral image of a scene comprising a point (p). The method comprises providing an imaging device (10, 10') comprising a two-dimensional image sensing unit (12, 13, 14) having a spectral characteristic, which varies along at least one direction in a plane parallel with an image sensor (13), acquiring a first two-dimensional image (11) of the scene, the first image comprising the point (p), wherein the spectral content of the scene varies along the direction as a consequence of the varying spectral characteristic of the image sensing unit (12, 13, 14), moving the imaging device (10, 10') and the scene relative to each other, acquiring a second two-dimensional image (I2) of the scene, the second image comprising the point (p), wherein the spectral content of the scene varies along the direction as a consequence of the varying spectral characteristic of the image sensing unit (12, 13, 14), identifying the point (p) in the second image (I2) as a second pixel at a position (x2, y2) depicting the point (p), providing a spectral vector (S(p)) of the point, and providing an updated spectral vector (S'(p)) of the point based on an applicability vector (A(p)) of the point (p), the spectral vector (S(p)) of the point, a spectral value (z2(p)) of the second pixel and an applicability vector (B(p)) of the second pixel.
Abstract:
Provided is an image processing apparatus, an image processing method, and a program capable of correcting variations in spectral sensitivity of a plurality of pixels constituting an image sensor. The image processing apparatus 40 includes: a second external I/F unit 41 configured to obtain image data and a correction coefficient from an imaging apparatus 10; a correction amount calculation unit 441 configured to calculate an estimation value of a color component as a correction target in a pixel-of-interest using a pixel value of a surrounding pixel of a same color, that is, a pixel having the same color as the color of the color filter of the pixel-of-interest surrounding the pixel-of-interest and using the correction coefficient obtained by the second external I/F unit 41, and configured to calculate the correction amount of the pixel value of the pixel-of-interest based on the estimation value and the correction coefficient of the pixel-of-interest; and a pixel value correction unit 442 configured to correct the pixel value of the pixel-of-interest based on the correction amount calculated by the correction amount calculation unit 441.
Abstract:
A frequency registration deviation is quantified for a field spectrum collected during analysis by a spectroscopic analysis system of a sample fluid when the spectroscopic analysis system has deviated from a standard calibration state. The field spectrum is corrected based on the frequency registration deviation using at least one spectral shift technique, and a concentration is calculated for at least one analyte represented by the field spectrum using the corrected field spectrum. Related systems, methods, and articles are described.
Abstract:
The invention relates to a method for determining concentrations of absorber gases by means of a spectroscopic measuring device (1), wherein wavelength-dependent measured values are determined for a light intensity, and a wavelength-dependent measured value function is represented therefrom. A wavelength-dependent theoretical function is defined, which includes a calibration parameter as well as the concentrations as parameters. The calibration parameter is defined as a function of a device parameter and a correction factor, which depends on the concentrations. A cycle comprising a sequence of steps is consecutively carried out several times, wherein; in a first step, a numerical value for the correction factor is calculated from defined assumed values of the concentrations; in a second step, the theoretical function is determined via the calculated numerical value; in a third step, concentration values are determined by a compensation calculus between the theoretical function determined in the first step and the measured value function, and established as new assumed values. The assumed values determined in the third step of the last cycle are output as measured values.
Abstract:
The invention pertains to a method for transforming a set of spectral images, the method comprising: dividing the images in said set in identically arranged areas; for each of said areas, calculating a predetermined characteristic across said set of images; and, for each of said images, renormalizing intensity values in each of said areas in function of said predetermined characteristic of said area. The invention also pertains to a corresponding computer program product and a corresponding image processing system.
Abstract:
A measurement system for measuring blood characteristics includes a controller, an emitter, a sensor, a reference photo sensor, and a mask. The emitter emits light at a plurality of wavelengths from a first side of a blood flow channel to a second side of the blood flow channel. The sensor is provided on the second side of the blood flow channel. The reference photo sensor is provided on the first side of the blood flow channel. The mask is provided on the first side blocking reflected light other than from the light from the emitter to enter the reference photo sensor. The controller compensates measurements from the sensor based upon measurements from the reference photo sensor.
Abstract:
Method of determining a chemical composition of a slag portion (5), the method comprising the steps of: - providing the slag portion, the slag portion having a surface (S), - collecting light (L) reflected from the surface using an optical system (10), - obtaining a data set from the collected light, the data set at least defining a matrix containing values representative of an intensity of a part (L M,l ) of the collected light, each part being respectively collected from one of a plurality of points (M) at one of a plurality of wavelengths, the matrix being indexed at least by: - a plurality of space coordinates of the plurality of points, and - a plurality of spectral parameters representative of the plurality of wavelengths, - conditioning the matrix in order to obtain a reduced set of values, and - performing a mathematical algorithm using the reduced set of values in order to obtain the chemical composition. Corresponding installation.
Abstract:
The claimed invention refers to analytical systems of automatic measurement of mercury concentration and can be used to monitor industrial and sewage water and combustion gases. The task of the proposed invention is improvement of consumer characteristics of the monitor, increase in unattended operating time of the monitor and ensuring long functioning of the monitor. The set task is achieved by the mercury monitor including the input sample unit, the thermal atomizer, the analytical cell capable of being heated, the gas collector unit, and the sucking out pump, at that the analytical cell contains two windows being? transparent for resonant radiation of mercury, through one of which (at least) it is optically coupled with the atomic-absorption spectrometer; at least, one input gas port is located in its central part and, at least, two output gas ports, each of which is located between input gas port and the corresponding window, wherein the sample input unit is coupled with injecting pump capable of introducing the sample analyzed into the thermal atomizer, and the analytical cell has openings located in its both ends between the window and the nearest output gas port through which possibility of gas supply is realized.
Abstract:
A multispectral imaging color measurement system, comprising a dark room (6), a sample platform and an imaging system (1) for photographing objects to be measured; also comprising a controllable illumination system, a filter wheel system, an imaging signal processing system and an electronic control system. The controllable illumination system provides a high spatially-homogeneous illuminated environment for the imaging system (1). The filter wheel system filters the reflected light emitted by the controllable illumination system and reflected by the sample to be measured, and provides a light band with a proper wave length for the imaging system (1) to image. The imaging signal processing system calibrates and performs reflective reconstruction for the image taken by the imaging system (1). The electronic control system controls the operation of each part of the multispectral imaging color measurement system. A method for processing imaging signals of the multispectral imaging color measurement is also proposed. The multispectral imaging color measurement system and the method for processing imaging signals thereof can overcome the defect of inaccuracy of traditional chroma imaging systems and spectrophotometer systems, and provide users in the textile industry with the basic functions of highly accurate color measurement and evaluation.