Abstract:
L'invention concerne un appareil de spectrométrie Raman comportant une source d'excitation (14), des moyens optiques (16) d'excitation dirigeant un faisceau d'excitation (15) issue de cette source sur l'échantillon (17), des moyens de collecte (18) de l'énergie diffusée par l'échantillon (17) comportant une fente d'entrée (19) de diffusion, un système de dispersion spectrale (20), des moyens de sélection de l'énergie Raman (23), un détecteur (22), des moyens optiques (21) de détection dirigeant l'énergie Raman collectée et sélectionnée vers le détecteur (22). Selon l'invention, les moyens optiques (16) d'excitation font disperser le faisceau d'excitation (15) par le système de dispersion (20), lesdits moyens optiques (16) d'excitation comportant une fente d'entrée (24) et une fente de sortie d'excitation constituée par la fente d'entrée (19) de diffusion et sélectionnant la longueur d'onde d'excitation.
Abstract:
There is presented a multipoint measurement system comprising light sources (1, 2) ; a plurality of illuminating fibers (5, 6) for transmitting light from the light sources to a sample so as to illuminate a plurality of points of the sample (A, B) ; a plurality of receiving fibers (8, 9) for collecting light beams including transmitted, reflected, scattered light beams at the plurality of points; a beam selector (10) which comprises a rotatable disk (12) having an aperture for transmitting a light beam collected by one of the plurality of receiving fibers (8, 9) through the receiving fiber (11) ; and an MCPD (4) . When the rotatable disk (12) is rotated so that the aperture is displaced to and stops at a position at which light at the desired channel passes through, it is possible to perform measurement only on the light passing through the corresponding receiving fiber (8, 9, 11) . Light at any other channel may be measured by rotating the rotatable disk (12) by a predetermined angle.
Abstract:
Disclosed herein is a method of analyzing spectrum using multi-slit member and multi-channel spectrograph using the method. The multi-channel spectrograph includes a focusing lens (12a) for focusing the focus of an objective light (2) generated in a light source (4) and passed through a specimen (3). A slit unit passes the objective light focused by the focusing lens (12a) through at least one slit formed therein. A concave grating (16) diffracts the objective light (2) passed through the slit unit. A detector unit detects the objective light diffracted by the concave grating (16). The slit unit is a multi-slit member (14) with a plurality of slits (14a). The objective light (2) diffracted by the concave grating (16) and directed toward the detector unit is moved by the movement of the multi-slit member (14).
Abstract:
A spectroscopy system having enhanced noise reduction that comprises (i) an arc lamp light source (20) of emitted light, which emitted light is projected as an image (A') of the light source; (ii) a slit aperture (22) trough which the emitted light is projected; and (iii) a detector (23) operably associated with the slit aperture (22) for detecting the emitted light. The slit aperture (22), the arc lamp (20), and the image of the arc lamp (A') each have a major axis. The major axis of the slit aperture (22) is oriented essentially orthogonally to the major axis of the image of the arc lamp (A'), so that the signal-to-noise ratio of the spectroscopy system is improved as compared to the signal-to-noise ratio of the spectroscopy system when the major axis of the slit aperture is oriented essentially parallel to the major axis of the image of the arc lamp.
Abstract:
The invention relates to a controllable microcode line for spectrometers which in a first part (B1) is divided into n identical partial areas (21, 22). Depending on the radiation used in the spectrometer the partial areas are provided with a transparent or reflecting and a non-transparent or absorbent optical power in accordance with the code sequence in the first line of a defined diagonal matrix. At least one second area (B1) is provided for directly adjacent to the first area which has the same number n of partial areas as said first area. These partial areas have the same optical power as the partial areas of the first area and a fixed aperture stop (3) is positioned ahead of these areas and assigned to them. The microcode line can be displaced in relation to the fixed aperture stop (3) in (n-1) discrete steps in such a way that in each case a complete number n of partial areas is detected through the opening (Sp).
Abstract:
A method and apparatus for in-process transient spectroscopic analysis of a molten metal, wherein a probe (10) containing a pulsed high-power laser (14) producing a pulsed laser beam having a substantially triangular pulse waveshape is immersed in the molten metal and irradiates a representative quantity of the molten metal. The pulsed laser beam vaporizes a portion of the molten metal to produce a plasma plume having an elemental composition representative of the elemental composition of the molten metal. Before the plasma plume reaches thermal equilibrium shortly after termination of the laser pulse, a spectroscopic detector (241) in the probe (10) detects spectral line reversals, during a short first time window. Thereafter, when the afterglow plasma is in thermal equilibrium, a second spectroscopic detector (242) also in the probe (10) performs a second short time duration spectroscopic measurement. A rangefinder (22) measures and controls the distance between the molten metal surface and the pulsed laser (14).
Abstract:
An automated chemistry-testing system for analyzing serum samples in which a controlled, constant intensity, monochromatic light beam of substantially any desired wavelength can be selectively directed through any one of a plurality of test solutions in a spectrophotometer. The system comprises a monosource (11) to provide substantially monochromatic light of different wavelengths, an intensity monitor (12) to monitor the light intensity at each wavelength, a variable aperture system (82) that is adjusted in real-time to control the intensity of monochromatic light exiting the monosource (11), a wavelength calibrator (13) to insure that the selected wavelength of light will be produced when it is desired and fiber-optical pathways (21-24) to direct the light beam from the monosource (11) to each of a plurality of flow cells (97) containing test solutions to be evaluated. The system operates at very high speed, permitting serum tests solutions to be scanned with a multiplicity of wavelengths of light to provide extensive data on the characteristics of the serum. The invention also provides substantial flexibility and permits a wide variety of tests to be more reliably performed.
Abstract:
A transmissive sampling module is provided, which is adapted to a spectrometer main body. The transmissive sampling module includes a light source assembly and a support base. The light source assembly is directly connected to the support base. The support base includes a tube body and at least one fixing member. The tube body surrounds an accommodating groove, and an extending direction of the tube body is not parallel to an optical path of the light source assembly, and the tube body includes a transparent portion, and the optical path of the light source assembly passes through the transparent portion and the accommodating groove. The at least one fixing member is disposed on the tube body and is adjustably protruded out of an inner surface of the tube body. A transmissive spectrometer is also provided.
Abstract:
A Compact and Athermal VNIR/SWIR Spectrometer utilizes a slit, a Mangin lens, a pupil lens adjacent to the diffraction grating, corrector lenses, a beam splitter, field lenses and SWIR and VNIR FPAs. In examples, two corrector lenses are used. Some examples do not utilize field lenses and beam splitter, some examples utilize only the SWIR radiation spectrum. By balancing the powers of the optical elements and Abbe numbers of glasses as well as usage of aspheric surfaces combinations, a monochromatic and polychromatic aberrational correction is achieved; by balancing optical elements refractive indices change with temperature an athermalization is achieved. The overall length of the spectrometer does not exceed 4 inches, and in some examples it is 2.5 inches. A wide field of view and a low F number are obtained with an operating wavelength range from approximately 400 to 2350 nm. The spectrometer is particularly suited to airborne applications.
Abstract:
An optical slit device that combines microelectromechanical design techniques, semiconductor laser technology, and micro-optics to provide a spectrometer entrance slit on a semiconductor substrate with integrated calibration light sources, which integrated light enters the entrance slit and is transmitted down the same optical path as a light source under test and by which the spectrometer can be wavelength calibrated in situ is disclosed.