Abstract:
A monolithic Offner spectrometer is described herein as are various components like a diffraction grating and a slit all of which are manufactured by using a state-of-the-art diamond machining process. In one embodiment, a monolithic Offner spectrometer is directly manufactured by using a diamond machining process. In another embodiment, a monolithic Offner spectrometer is manufactured by using molds which are made by a diamond machining process. In yet another embodiment, a diffraction grating is directly manufactured by using a diamond machining process. In still yet another embodiment, a diffraction grating is manufactured by using a mold which is made by a diamond machining process. In yet another embodiment, a slit is directly manufactured by using a diamond machining process.
Abstract:
The invention concerns a Raman spectrometry apparatus comprising an excitation source (14), excitation optical means (16) directing an excitation beam (15) derived from said source on the sample (17), means for collecting (18) energy diffused by the sample (17) including an entrance slit (19) for the diffusion, a spectral dispersion system (20), means for selecting Raman effect energy (23), a sensor (22), optical means (21) for sensing energy directing the collected and selected Raman effect energy towards the sensor (22). The invention is characterized in that the excitation optical means (16) cause the excitation beam (14) to be dispersed by the dispersion system (20), said excitation optical means (16) comprising an entrance slit (24) and an exit slit formed by the diffusion entrance slit (19) and selecting the excitation wavelength.
Abstract:
A light amount is increased and an analyzing accuracy can be increased in accordance with an enlargement of a load angle.. However, scattered light tends to be loaded into a light receiving element in an analysis accompanied by scattered light, and the dynamic range of a concentration which can be measured becomes narrow. In the invention, light is dispersed by a light dispersing portion (20), a load angle of the received light is changed per wavelength, the load angle is made larger for light of a wavelength having a small light amount, and the load angle is made smaller for light of a wavelength having a large light amount and used for an analysis accompanied by scattered light. Accordingly, it is possible to gain a dynamic range of a concentration which can be measured in the analysis accompanied by scattered light, while increasing the light amount and maintaining the analyzing accuracy.
Abstract:
Noxious emissions present in the exhaust gases of an internal-combustion engine of a motor vehicle are controlled by making use of an IR spectrophotometer provided on board the motor vehicle, for the purpose of obtaining an analysis of all the main components of the exhaust gases of the engine. The IR spectrophotometer is of the type with electrostatic micro-shutters so as to present overall dimensions designed to enable its use on board the motor vehicle.
Abstract:
The invention relates to a highly sensitive spectrometer assembly, in which a slit array consisting of parallel individual slits is reproduced on a corresponding detector array with the aid of an optical unit that disperses light in a horizontal direction, splitting it into wavelengths, whereby signals from said detector array are fed to an evaluation device. Characteristic parameters can be determined in a highly precise manner by using fixed slit patterns. To achieve this, the slit array comprises at least one fixed, application-related pattern containing at least two slits that are offset in the dispersion direction by specific values, the spectral images of said slits overlapping on the detector array to form a cumulative spectrum, from which the evaluation device directly extracts the parameters that are to be determined for the application.
Abstract:
Noxious emissions present in the exhaust gases of an internal-combustion engine of a motor vehicle are controlled by making use of an IR spectrophotometer provided on board the motor vehicle, for the purpose of obtaining an analysis of all the main components of the exhaust gases of the engine. The IR spectrophotometer is of the type with electrostatic micro-shutters so as to present overall dimensions designed to enable its use on board the motor vehicle.
Abstract:
An ultraviolet/visible/infrared spectrophotometer, with a pulsed light source (10), has a monochromator with variable slit width to provide variable spectral resolution. The dynamic range at the detectors (24, 28) is reduced by varying the pulse energy emitted by the light source (10) in accordance with the wavelength and slit width settings (34, 36), and/or by varying the slit height in accordance with the slit width. The ligth source (10) may be a xenon flash lamp.