Abstract:
Es wird ein Messaufbau für die optische Absorptions - Spektroskopie angegeben, bei dem das für die Messung verwendete Licht in Koppelelementen (21, 22) von mehreren cm Länge in ein Behältnis mit heißem Gas hineingeführt wird. Dabei sind Lichtquelle (16) und Fotodetektor (17) luftspaltfrei mit den Koppelelementen verbunden. Eine Heizung (24) hält die Temperatur der Koppelelemente über der umgebenden Temperatur, um Kondensation verschiedener Stoffe zu verhindern.
Abstract:
In accordance with an example embodiment of the present invention, apparatus comprising a waveguide and a spectral dispersion element, the apparatus being configured to be moveably attachable to a portable device, the portable device comprising a radiation sensing element and a radiation source, the apparatus being configured to be moveably attachable to the portable device to provide a first configuration in which the waveguide is positioned to transmit radiation from the radiation source towards an analyte region and/or from the analyte region towards the dispersion element; and such that the dispersion element is positioned to disperse radiation from the analyte region to form a spectrum which is provided towards the radiation sensing element for spectral analysis, and a second configuration in which the radiation sensing element and radiation source are able to capture and illuminate a scene for image capture.
Abstract:
The invention concerns a device (20) for UV-spectrometric analysis of gaseous Compounds, comprising: a measurement Channel (5) to accommodate a flow of sample gas, a window (16) transparent for ultraviolet radiation arranged at a first end (5a) of the measurement Channel (5), a radiation source (11) generating ultraviolet radiation arranged to emit radiation through the window (16) into the measurement Channel (5), and a spectrograph (3) for measuring ultraviolet radiation at a second, opposite, end (5b) of the measurement Channel (5). The invention is characterized in that the spectrograph (3) is provided with an opening (12) wherein the second end (5b) of the measurement Channel (5) is open towards the spectrograph (3) such that an inside of the spectrograph (3) and the measurement Channel (5) are in communication via said opening (12). The spectrograph (3) is filled with a protection gas which is allowed to flow through said opening (12) and into the measurement Channel (5).
Abstract:
This invention discloses an optical spectrometer and a method for enhancing signal intensity for optical spectroscopy. The spectrometer includes: a light source and sampling unit, adapted to emit light and project the light onto a sample; an optical signal pre-processing unit, adapted to receive the light from the sample and output phase-division multiplexed and spatially decoupled optical signals in multi-channels; an optical signal encoder, adapted to allow optical signals of one or more channels among the multi-channels to pass through and reject optical signals of the rest of the multi-channels according to an encoding pattern; and a detection unit, adapted to acquire optical signals from the one or more channels passing through the optical signal encoder. The apparatus and method provided in the present invention can operate effectively with a weak throughput and achieve better operational reliability.
Abstract:
The present invention relates to a spectral detection device (100) for detecting spectral components of received light, wherein the spectral detection device (100) comprises a filtering structure (110) arranged to filter the received light and output light with a wavelength within a predetermined wavelength range; and a light sensor (120) arranged to detect the light output by the filtering structure (110), wherein the filtering structure (110) is variable to allow a variation of the predetermined wavelength range over time. The arrangement enables a compact spectral detection device that may be provided at a low cost.
Abstract:
Apparatus and methods can include an optical waveguide coupled to a photonic crystal comprising a dielectric material, the photonic crystal located on an exterior surface of the optical waveguide and comprising a first surface including a first array of periodic features on or within the dielectric material, the array extending in at least two dimensions and including an effective dielectric permittivity different from the surrounding dielectric material. In an example, the periodic features include a specified lattice constant, the periodic features configured to extract a portion of propagating optical energy from the waveguide through the photonic crystal, the portion determined at least in part by the specified lattice constant.
Abstract:
A dual-mode includes a light source configured to project a structured illumination from which visible light can be filtered. The dual-mode imager also includes a detector configured to capture both the structured illumination and visible light from the scene. A temporal or spatial filter is used to selectively block visible light from one or more portions of the detector while passing the structured illumination to the one or more portions of the detector.
Abstract:
The invention relates to a spectral detector for measuring properties of light over portions of the electromagnetic spectrum including cholesteric liquid crystal material and switching means capable of varying the pitch of the helix of the cholesteric liquid crystal material, so that the position of the transmission wavelength band is adjusted in response to the switching means. The spectral detector may further include at least one light direction selecting structure for selecting light incident on the spectral detector having a certain angle of incidence. This invention also relates to a lighting system including the spectral detector of the invention.
Abstract:
A system for analyzing optical cavity modes of at least one microcavity or at least one cluster of microcavities, comprises, an apparatus for sensing a change in the condition of or for analyzing the optical cavity modes by utilizing an optical interference of the optical cavity modes.
Abstract:
An arrangement for in-situ optical interrogation of plasma emission to quantitatively measure normalized optical emission spectra in a plasma chamber is provided. The arrangement includes a flash lamp and a set of quartz windows. The arrangement also includes a plurality of collimated optical assemblies, which is optically coupled to the set of quartz windows. The arrangement further includes a plurality of fiber optic bundles, which comprises at least an illumination fiber optic bundle, a collection fiber optic bundle, and a reference fiber optic bundle. The arrangement more over includes a multi-channel spectrometer, which is configured with at least a signal channel and a reference channel. The signal channel is optically coupled to at least the flash lamp, the set of quartz windows, the set of collimated optical assemblies, the illuminated fiber optic bundle, and the collection fiber optic bundle to measure a first signal.