Abstract:
The invention relates to a spectrometry device that comprises: a lighting device for generating a light beam covering a wavelength band, a probe (PRB) arranged so that the light beam from the lighting device interacts with a fluid to be analysed (20), and a spectral analysis device arranged for receiving the light beam after interaction with the fluid to be analysed, and for providing light intensity measures for different wavelength ranges, wherein the probe (PRB) includes a reflector (13) of the back-reflecting type towards the light source, that is arranged so as to receive the light beam from the lighting device through the fluid to be analysed and to reflect it in a substantially opposite direction while slightly spreading the same towards a collecting light guide (12) associated with the reflector and the spectral analysis device in order to at least partially collect the light beam having crossed the fluid to be analysed and to transmit the same to the spectral analysis device.
Abstract:
Thermally tunable optical sensors are used in sampling tools for analysis of samples from a wellbore. The thermally tunable optical sensors generate a series passbands of wavelength emissions and detect attenuation in a signal thereof. The attenuation detected is processed and used to determine aspects of the samples. Analysis may be completed remotely (outside of the wellbore), within the wellbore (during drilling or otherwise), or as a part of another process such as fluid management, transport and refinement.
Abstract:
A tunable radiation emitting structure comprising a discontinuous conducting interface having periodic or quasi-periodic features, wherein the structure emits narrowband terahertz radiation when heated is disclosed.
Abstract:
A method and apparatus are described for driving a modulated radiation source (which can be, for example, an infrared light source). The method affects the power driving a light source in such as way so as to minimize the warm-up time of the source. The apparatus permits feedback control of a light source to specified powers or temperatures. Disclosed embodiments can improve source performance and lifetime and decrease the operating costs of the source.
Abstract:
An infrared light source which is simple in structure and emits infrared rays with specific wavelengths. The infrared light source comprises a heat emitting element (107) and a plurality of lattices respectively corresponding to a plurality of specific wavelengths. The plurality of lattices respectively consist of dielectric elements (105) and metal elements (103) formed alternately in a specified direction and at a specified cycle. When one of the plurality of specific wavelengths is ?, the cycle P of a lattice corresponding to it, the width T of the dielectric element and the depth D of the lattice are selected so that the intensity peak wavelength of an infrared ray emitted from that lattice agrees with the ?. P and T are selected to satisfy the following relational expressions. 0
Abstract:
A method for the measurement and determination of the concentration of a certain component within a mixed medium by the absorption of infrared light, comprises the steps of - generating a modulated beam of infrared light; - passing said modulated beam of infrared light through the mixed medium; - receiving said modulated beam after having passed though said mixed medium by means of an infrared detector (17); and - receiving and processing electrical signals of said infrared detector (17), said signals being characteristic of the received modulated infrared beam. The measurement is substantially improved and simplified when - the modulated beam of infrared light is generated by means of a modulated broad band infrared light source; - the modulated beam is sent through a wavelength-selective device (16) after having passed through said mixed medium, and before being received by said infrared detector (17); and - a multi-channel detector array (17) is used as said infrared detector.
Abstract:
An infrared spectral system (10) for identifying target mineral grain particles within a group of mineral grains (12) is disclosed. In an example embodiment, the system (10) comprises a conveyor belt (20) for carrying the group of mineral grains (12), at least one infrared excitation module (16) that includes means (40) for providing infrared radiation to the group of mineral grains (12) on the conveyor belt (20), at least one infrared collection module (32) for collecting the reflected infrared radiation from the group of mineral grains (12) on the conveyor belt (20), processing means (72) for determining the location of target mineral grain particles on the conveyor belt (20), and target particle extraction means for picking the target particles based on the processing means' determined location of target particles. In an example embodiment, the means (40) for providing infrared radiation to the particles on the conveyor belt includes a heater element (46) located within a heater holder (42). In a second example embodiment, particles are presented as a batch to a spectral imaging system (100), and target particles are picked by a robotic system.
Abstract:
An optical mode noise averaging device (300) including a multimode optical fiber (302) and means (308) for averaging a modal noise induced signal level variation of light propagating within the multimode optical fiber (302). The device may average modal noise induced signal level variations by cyclically varying an index of refraction of the multimode optical fiber (302) over a select period of time, scrambling a light distribution within the multimode optical fiber (302), or both. The index of refraction of the multimode optical fiber may be cyclically varied by cyclically varying the temperature of the multimode optical fiber (302). Alternatively, the index for refraction may be varied or the light distribution within the multimode optical fiber may be scrambled by cyclically manipulating the multimode optical fiber (302).
Abstract:
A compact interferometer and a moving means and a light emitter for an interferometer. The compact interferometer has increased light throughput and may be provided in a single block of e.g. metal in order to be easier to manufacture, set up, align and in which the atmosphere is more easily controlled. The moving means has a rigid magnet part travelling within a coil part, increasing the stiffness and controllability of the system. The light emitter is a filament having a bifilar coil where no part of the filament extends within the coil.
Abstract:
A thin film infrared emitter comprises electrically conducting diamond-like carbon in a freely suspended membrane or deposited on a substrate with low thermal capacity and diffusivity. On applying an electric current through the film, the latter is heated and emits infrared radiation. Topographic microstructures in the surface of the film influences the intensity of the radiation, its spectral characteristics and its polarisation state. The film is formed by deposition from gas or vapour phase on a substrate which in advance has been provided with embedded electric feed conductors. In embodiments of the invention with a self-supporting membrane the feed conductors also act as a support for the membrane after removing the substrate material by means of physical or chemical processes.