A system for real-time assessment of systemic hydration includes a light source configured to operably emit light of first and second wavelengths; means for delivering the emitted light to a target site to excite at least one first spot at the target site, and collecting Raman scattering light scattered from the target site at a plurality of second spots; a detector coupled with said means for obtaining a plurality of spatially offset Raman spectra from the collected Raman scattering light, each spatially offset Raman spectrum corresponding to a respective second spot of the target site and associated with a depth of tissues at which the Raman scattering light is scattered; and a controller configured to process the plurality of spatially offset Raman spectra so as to identify spectral features from the plurality of spatially offset Raman spectra, and assess systemic hydration from the identified spectral features.

An infrared spectrometer for operation in the mid-infrared spectral range is presented, where the spectrometer includes a Bragg-mirror-based spectral filter that is operative for providing an interrogation signal whose spectral content is dispersed along a first direction at a filter aperture. The filter aperture is imaged through a sample by a thermal-imaging camera to create a focused image that is based on the interrogation signal and the absorption characteristics of the sample. As a result, embodiments in accordance with the present disclosure can be smaller, less complex, and less expensive than infrared spectrometers known in the prior art.

A hyperspectral imager (HSI) includes a first thin film filter, the first thin film filter including a first quarter wave mirror, a second quarter wave mirror, and a low-refractive-index wedge between the first quarter wave mirror and the second quarter wave mirror. The low-refractive-index wedge has a height dimension such that a distance between the first quarter wave mirror and the second quarter wave mirror increases linearly along a length of the low-refractive-index wedge.

A spectroscopic unit and spectroscopic device according to the present invention are provided with a filter that is provided with a plurality of optical filter elements disposed in order from the entrance side to the exit side of light under measurement and has different transmission wavelengths corresponding to entrance positions along a first direction. A first optical filter element from among the plurality of optical filter elements is tilted with respect to a second optical filter element disposed adjacently to the first optical filter element as a result of the first optical filter element being rotated by a prescribed angle with a third direction that is perpendicular to both the first direction and s second direction from the entrance side to the exit side as the axis of rotation thereof or being rotated by a prescribed angle with the first direction as the axis of rotation thereof.

A multichannel color measurement instrument for measuring spectral properties of a target comprises pick-up optics to collect measurement light, first and second anamorphic optical paths optically coupled to the pick up optics, a pick-up polarizing element located to polarize measurement light in the second anamorphic optical path, a reference anamorphic optical path including a reference illumination source, and a two-dimensional variable filter sensor having an optically transmissive filter function that varies in a first direction parallel to a surface of the variable filter sensor and is substantially constant in a second direction parallel to a surface of the variable filter sensor and orthogonal to the first direction. The anamorphic optical paths spread the measurement light in the first direction direct it on to different portions of the variable filter sensor.

An optical filter element for devices for converting spectral information into location information, uses a connected detector for detecting signals The element has at least two microresonators, each comprising at least two superposed reflective layer structures of a material layer having a high refractive index and a material layer having a low refractive index in an alternating sequence, and at least one superposed resonance layer arranged between the two superposed reflective layer structures. The filter element comprises at least one transparent plane-parallel substrate for optically decoupling the two microresonators; the first microresonator being located on a first of two opposing surfaces of said substrate, and the second microresonator being located on said substrate on a second surface thereof that lies opposite the first surface. The resonance layer of at least one microresonator, and/or the reflective layer structure that surrounds said resonance layer, has a layer thickness which can vary along a horizontal axis of said filter element.

Apparatus for spectrometrically capturing light includes a wavelength-adjustable filter for converting spectral information into location information and an organic photodiode for converting the location information into electrical signals which can be forwarded, wherein the filter and the organic photodiode form a one-piece monolith, the organic photodiode is connected to the filter or the organic photodiode is integrated in the filter, the filter consists of at least one spectrally resolving element in the form of at least one layer-like photonic crystal which constitutes the monolith and in which two layers of variable thickness D are formed along a direction perpendicular to the incidence of light. A resonant layer is arranged between the two layers. The organic photodiode includes: a photoactive layer, a first electrode, and a second electrode sandwiching the photoactive layer, and one of the electrodes is in contact with the photonic crystal.

A microplate reader includes a pair of linear variable filters (LVFs) that together form a wavelength selector. Movement of one or both of the LVFs enables selection of the desired center wavelength and/or passband used to analyze a sample on a microplate inserted into the microplate reader. The microplate reader may also include a similar second wavelength selector. The LVFs are located on movable frames, with each frame also advantageously including least one of an aperture, a fixed optical filter, and an optical polarization filter. In some cases, different types of measurements may be taken without changing the geometry of the optical path between the wavelength selectors. The microplate reader may additionally use a LVF to form a continuously adjustable dichroic for sample analysis.

An optical assembly is disclosed including two laterally variable bandpass optical filters stacked at a fixed distance from each other, so that the upstream filter functions as a spatial filter for the downstream filter. The lateral displacement may cause a suppression of the oblique beam when transmission passbands at impinging locations of the oblique beam onto the upstream and downstream filters do not overlap. A photodetector array may be disposed downstream of the downstream filter. The optical assembly may be coupled via a variety of optical conduits or optical fibers for spectroscopic measurements of a flowing sample.

A spectrometric method includes illuminating a target object with measurement light from a light source; receiving with a plurality of two-dimensionally-arranged pixels transmitted light or diffused reflected light output from the target object as a result of being irradiated with the measurement light; acquiring spectral data of each of a plurality of unit regions including at least one unit region and a unit region adjacent to the one unit region on the target object; and calculating spectral data of the target object by averaging the spectral data of the plurality of unit regions. Furthermore, a spectrometric device captures an image of the same unit region of the target object a plurality of times (twice or more) and calculates the spectral data of the target object by integrating and averaging a plurality of times' worth of spectral data obtained at each of the image-captured unit regions of the target object.