Abstract:
The present invention refers to an arrangement ("C") adapted to evaluate the spectral intensity of and/or a changing in the spectral intensity of an electro-magnetic beam (1) or a bundle of beams (2), whereby said bundle of beams is directed towards and received by a lens element (3a) and where said lens element (3a) is adapted to direct said bundle of beams towards a multitude of electro-magnetic beam to an electric signal transforming means (4), named as an opto-electric transforming means, said means adapted to generate an electric signal (5) representative to said spectral intensity of or said changing in said spectral intensity of said beam (1, 2). The invention suggests that a multitude of lens elements (3, 3a) shall expose dimensions adapted within a sub-micron scale (10 -6 m) and that at least one of said opto-electric transforming means (4), preferably a multitude of said means (4), is arranged adjacent to said lens element (3a).
Abstract:
A spectrometer 1A is made up of : an optical body 10 within which a light separation path is set along which an object light to be separated propagates; a light entry slit 16 through which the object light enters; a diffraction grating 17 for spectrally separating the incident object light; and a photodiode array 18 for detecting the object light separated by the diffraction grating 17. As an optical member for optically interconnecting the optical body 10 and the photodiode array 18, an optical connection member 20 is provided, with its light entry surface 21 for the separated object light in contact with the upper surface 11 of the optical body 10, with its light exit surface 22 in contact with the photodiode array 18, with the light exit surface 22 tilted by a specified angle relative to the light entry surface 21. Thus, the spectromoter capable of bringing about sufficient accuracy of placing optical elements in a simple constitution while bringing down cost is realized.
Abstract:
An apparatus for monitoring spectral information of an optical transmission system; said apparatus comprising a monolithic spectrometer and at least one transmission signal detecting means for producing output signals of separated transmission signal components and optical noise.
Abstract:
A monolithic spectrometer system providing vibration immunity and thermal stability, designed for infrared gas detection and chemical identification in the field or on the loading dock. One embodiment of the invention includes a spectrometer system (10) with the following elements: a silicon block waveguide (12); a cylindrical mirror (14); a diffraction grating (16); and a linear detector array (18). Electronics (20) can couple to the array (18) so as to collect electronic data representative of the spectral characteristics of the light (22) entering the system (10). Control of the system (10) is obtained through user interface (24). A battery (26) can be used to power the system (10).
Abstract:
A device for simultaneously determining the direction and wavelength of an incident light beam. The device includes a transparent block (12) and a diffraction grating (16) for diffracting the incident light beam (22) to produce a number of diffracted beams (24, 26) within the transparent block. The device further includes a detector array (20) generating an output indicative of positions of intersection of the diffracted beams. Finally, the device includes a processor (28) for processing the output to determine the direction and wavelength of the incident beam.
Abstract:
An ultra violet radiation detector comprises a slice of silica (10) having an entrance slit (18) from which radiation diverges to a curved reflective face (20, 22) which reflects it to a planar diffraction grating (28) as a convergent beam. The grating focuses a required spectral order on an array of UV detectors (24). Usually the first order spectrum is focused. The detector may be hand held.
Abstract:
A spectrometer (10) for analyzing a sample of material (22) utilizing a broad band source of electromagnetic radiation (28) and a detector (36). The spectrometer (10) employs a waveguide (12) possessing an entry (14) and an exit (16) for the electromagnetic radiation emanating from the source (28). The waveguide (12) further includes a surface (20) between the entry and exit portions which permits interaction between the electromagnetic radiation passing through the waveguide (12) and a sample material (22). A tapered portion (24) forms a part of the entry (14) of the waveguide and couples the electromagnetic radiation emanating from the source (28) to the waveguide (12). The electromagnetic radiation passing from the exit (16) of the waveguide is captured and directed to a detector (36) for analysis.
Abstract:
A spectrometer wavelength selection arrangement is formed by a prism (20) having a face (22) which is arranged with respect to the incoming light beam to be analyzed such that there is a total internal reflection. Exteriorly of the surface (22) but in optical contact there is provided a waveguide structure (17) which has an effective refractive index to allow evanescent coupling of at least one wavelength from the prism (20) into the structure (17). Provision is made to vary the parameters at the surface (22) so that selected wavelengths are evanescently coupled across for detection by a photo-diode (26) associated with the structure (17). Parameter variation may be electro-optic when a component of the waveguide structure (17) is an electro-optic material.
Abstract:
A spectrograph usable as a demutiplexer/detector in a wavelength division multiplexing optical system. The spectrograph comprises a planar waveguide (50) and a detector array (52). The planar waveguide (50) has a dispersive edge (56) having an inwardly concave shape, an input edge (62), and a straight output edge (64). The dispersive edge (56) has a reflective diffraction grating (60) formed on it, the grating (60) having a variable line spacing. An optical input signal comprising a plurality of different wavelength ranges enters the waveguide at the input edge (62), and travels through the waveguide and strikes the grating (60). The grating (60) focuses the optical energy in each of the wavelength ranges at a focal spot at the output edge (64), the position of each focal spot being a function of wavelength. The detector array (52) comprises a plurality of photodetectors positioned along a straight line, such that the photodetectors are positioned at the focal spots. Each photodetector therefore detects the optical energy in one of the input ranges. A stack of such planar waveguides may be assembled to form a multi-channel spectrograph.
Abstract:
An optical spectral analyzer (10) for receiving an input beam (30) through a multi-mode optic fiber (28). The input or beam (30) has a predetermined spectral bandwidth. The random individual spectral components of the beam (30) are dispersed by a grating (40) to generate a spectrum (42, 42'...42N). A detector (52) senses the magnitude of the elements in a reflected focused spectrum (50, 50'...50N) to recover the information placed on the optic fiber (28) at a remote location by a spectrum encoding device.