Disclosed is a sample analyzer that includes: a measurement unit configured to apply light to a measurement specimen containing a plurality of kinds of target substances each labeled with fluorescence, and detect a plurality of kinds of fluorescences having different wavelengths; and a processing unit configured to analyze the plurality of kinds of target substances based on a detection result from the measurement unit, and information, on a color of fluorescence, which is set to be variable so as to correspond to the plurality of kinds of target substances.

In a method and apparatus, a property of an optically diffuse medium including a first optical absorber having a first concentration and a second optical absorber having a second concentration is determined. A surface area of the medium is imaged at multiple wavelengths around an isosbestic wavelength of the first absorber and the second absorber. A reflectance spectrum of the medium at the surface area at the multiple wavelengths is determined. A derivative of the determined reflectance spectrum around the isosbestic wavelength is determined. From the derivative, a concentration ratio of the first concentration and the second concentration is estimated.

Technologies are generally described for determination and analysis of an optical profile of a liquid-based material to implement real-time monitoring of a composition of the liquid-based material for quality control. An imaging sub-system may include a plurality of illumination sources configured to illuminate the liquid-based material with light, and one or more detectors. The detectors may be configured to detect light reflected from a first surface of the liquid-based material, light reflected from a second surface of the liquid-based material, and/or light transmitted through the first surface and the second surface of the liquid-based material in response to the illumination. An analytics sub-system coupled to the imaging sub-system may be configured to analyze the detected light to determine an optical profile of the liquid-based material, and monitor the optical profile in real-time to detect changes in the optical profile indicative of corresponding changes to a composition of the liquid-based material.

A blood coagulation analyzer and analyzing method perform following: (a) preparing a measurement specimen by dispensing a blood specimen and a reagent into a reaction container; (b) emitting light of a plurality of wavelengths to the measurement specimen in the reaction container, the wavelengths comprising a first wavelength for use in a measurement by a blood coagulation time method, and at least one of a second wavelength for use in a measurement by a synthetic substrate method and a third wavelength for use in a measurement by an immunoturbidimetric method; (c) detecting light of a plurality of wavelengths corresponding to the light emitted in (b), from the measurement specimen, by a light receiving element, and acquiring data corresponding to each wavelength; and (d) conducting an analysis based on the data corresponding to one of the wavelengths among the acquired data, and acquiring a result of the analysis.

Systems and methods for detecting trace gases utilize a resonance optical cavity and one, two or more coherent light sources coupled to the cavity through one or more cavity coupling mirrors, whereby two or more optical cavities may share the same gas volume.

A method of performing spectroscopic measurements provides an optical frequency comb, and directs the comb through or at a sample. The optical frequency comb is generated by gain switching a laser diode constructed from Gallium Nitride and related materials. Various techniques are described for manipulating the comb source to achieve desired benefits for spectroscopy.

Disclosed are methods of fabricating an integrated computational element for use in an optical computing device. One method includes providing a substrate that has a first surface and a second surface substantially opposite the first surface, depositing multiple optical thin films on the first and second surfaces of the substrate via a thin film deposition process, and thereby generating a multilayer film stack device, cleaving the substrate to produce at least two optical thin film stacks, and securing one or more of the at least two optical thin film stacks to a secondary optical element for use as an integrated computational element (ICE).

A spectroscopic analysis apparatus comprises a multi-chamber cuvette for fluid or gas analysis, wherein the multi-chamber cuvette comprises at least two measurement chambers into which fluid or gas can be introduced for analysis, wherein the at least two measurement chambers are optically separated from one another, wherein an illumination device is provided to generate light and to couple the light into the at least one first and second measurement chamber, and wherein a detection device is provided to measure an intensity of the light radiated by the fluid or gas in the first measurement chamber for a first wavelength and to generate a first measurement result and to measure an intensity of the light radiated by the fluid or gas in the second measurement chamber for a second wavelength and to generate a second measurement result, wherein the first wavelength and the second wavelength are different.

The invention relates to an assembly for a multispectral light emission, comprising at least one wide-band light source (1), a filter array (4) of multiple spectral filters, and an optical switch device (2) for controlling the passage of the light emitted from the light source (1) through the filter array (4). In one embodiment, the optical switch device (2) is made of an array of micromirrors (16) or micro-diaphragms and is designed and arranged such that the optical switch can guide light emitted from the light source (1) only through one or more arbitrarily specifiable spectral filters of the filter array (4) in a controlled manner. The invention also relates to a multispectral sensor comprising such an assembly for a multispectral light emission. The assembly allows a multispectral sensor to be provided inexpensively in a miniaturized design with a plurality of spectral channels.

A method and an apparatus are presented for monitoring a concentration of a specific halogen in a body of water such as a spa or bathing unit for example. The apparatus comprises a housing in which is positioned an optical absorption analyzer for making first and second measurement of transmission of ultraviolet light from a light source emitting light at a specific wavelength. The second and first measurements are taken respectively before and after the ultraviolet light has travelled through a sample of water and are used to derive a concentration of the specific halogen. The derived concentration may then be communicated to a user using a display device and/or may be used to control operational components of a bathing unit for adjusting the concentration of halogen in the water. In some practical implementations, the apparatus may be embodied as a standalone device, which may be configured to float on the water of the bathing unit or, alternatively, may be configured for being installed in-line in a water circulation path of the bathing input by connecting the housing to circulation piping.