Abstract:
Disclosed herein is a spectrophotometer at least including: an optical waveguide; a light entrance slit provided at an end face on the inner side of the optical waveguide, for bringing an incident light into the optical waveguide; an optical element provided at an end face on the inner side of the optical waveguide or at an interior of the optical waveguide, for separating the incident light brought in the optical waveguide into a spectrum; and a photoelectric conversion device provided at an end face on the inner side of the optical waveguide, for detecting the incident light separated into the spectrum at the optical element; wherein the optical waveguide, the light entrance slit, and the optical element being integrally formed on an optical waveguide board, and a photoelectric conversion device substrate having the photoelectric conversion device formed thereon being mounted on the optical waveguide board.
Abstract:
An integrated optical multiplexer and/or demultiplexer is provided for on-chip optical interconnection between electronic components on an integrated circuit chip and between chips, and for high density telecommunications. The multiplexer and/or demultiplexer includes an integrated circuit substrate formed with an array of photo detectors (for the demultiplexer) or photo emitters (for the multiplexer). Conditioning electronics is formed on the substrate and is coupled to the photo elements for conditioning electronic data for optical transmission in the case of the multiplexer or for conditioning optical signals into electronic data in the case of the demultiplexer. A first layer of optically transparent material is formed on the substrate overlying the detectors and/or emitters and a second layer of optically transparent material is formed on the first layer and functions as an optical waveguide. A binary blazed grating is formed at the interface of the first and second layers of optically transparent material. In use, discrete wavelength optical signals are modulated with data and emitted by the photo emitters. The discrete wavelengths are intercepted by the binary blazed grating overlying the emitters and multiplexed into a polychromatic beam for transmission through the waveguide. At the demultiplexer, the discrete wavelengths are separated by the binary blazed grating and directed to corresponding ones of the photo detectors. The conditioning electronics coupled to the photo detectors receives the output of the photo detectors, demodulates the output to extract the data, and formats the data for communication with electronic components on the integrated circuit.
Abstract:
A color measuring sensor assembly includes an optical filter such as a linear variable filter, an optical detector array positioned directly opposite from the optical filter a predetermined distance, and a coherent fiber faceplate having a plurality of optical fibers interposed between the optical filter and the detector array. A light beam propagating through the fiber faceplate from the optical filter to the detector array projects an upright, noninverted image of the optical filter onto a photosensitive surface of the detector array. Each optical fiber in the fiber faceplate is of limited aperture to control the tendency of light to diverge and to increase the resolution capabilities of the sensor assembly. The color measuring sensor assembly can be incorporated with other components into a spectrometer device such as a portable calorimeter having a compact and rugged construction.
Abstract:
A spectrometer fitted with a thin light guide layer in a stratification manufactured by thin-film technology, said light guide being sandwiched between two cover layers of lower index of refraction, said layer light guide's end face comprising a grating which is illuminated with the light to be analyzed and passing through the said light guide layer, the spectrometer furthermore comprising a line sensor onto which is imaged the spectrum, the staircase echelon grating being fitted with transparent step surfaces and with step edges perpendicular to said layer's plane, a second medium forming an interface with the grating's step surfaces and having an index of refraction less than that of the light guide layer, characterized in that the height and the width of the grating continuously change in the staircase direction in such manner that for two selected wavelengths the particular total optical paths through the light guide layer and the second medium as far as a focal point pertaining the particular wavelength shall differ by the same multiple of the particular wavelength.
Abstract:
Optical characteristic measuring systems and methods such as for determining the color or other optical characteristics of teeth are disclosed. Perimeter receiver fiber optics preferably are spaced apart from a source fiber optic and receive light from the surface of the object/tooth being measured. Light from the perimeter fiber optics pass to a variety of filters. The system utilizes the perimeter receiver fiber optics to determine information regarding the height and angle of the probe with respect to the object/tooth being measured. Under processor control, the optical characteristics measurement may be made at a predetermined height and angle. Various color spectral photometer arrangements are disclosed. Translucency, fluorescence, gloss and/or surface texture data also may be obtained. Audio feedback may be provided to guide operator use of the system. The probe may have a removable or shielded tip for contamination prevention. A method of producing dental prostheses based on measured data also is disclosed. Measured data also may be stored and/or organized as part of a patient data base. Such methods and implements may be desirably utilized for purposes of detecting and preventing counterfeiting or the like. Preferably, a two stage spectral separation is utilized, preferably utilizing a diffraction grating and interference filters.
Abstract:
A spectrometer system comprises (i) a slab waveguide characterized as an index of refraction higher than a surrounding medium, and having front surface and a rear surface opposite thereto, the front surface including a input portion for accepting optical radiation, a diffractor portion and an exit portion, (ii) a diffraction grating disposed on said diffractor portion of said front surface, (iii) a detector array aligned adjacent to the exit portion, and (iv) a mirror coated on the rear surface of the waveguide. Radiation transmitted within the waveguide from the input portion is reflected and collimated by the mirror to the granting. Light diffracted from the grating is dispersed to the mirror and reflected toward and through the exit portion and onto the array.
Abstract:
A device for compensating the temperature sensitivity normally associated with an integrated optical waveguide grating device has a temperature compensating slab waveguide region. This compensating region is provided within the slab waveguide region normally present in the grating device by modifying a sub-region of a predetermined shape and dimension to change its temperature coefficient of refractive index. This method and device can be applied to reflective and transmissive diffraction gratings and to phased array waveguide gratings.
Abstract:
A miniaturized spectrometer is adapted for placement within a body near tissue to be characterized. The spectrometer includes a light source and a plurality of light detectors. The light source generates light to illuminate the tissue. The detectors detect optical signals from the illuminated tissue and convert these optical signals to electrical signals. The miniaturized spectrometer can be disposed at the distal end of an interventional device. Optical conduits, such as fiber optic cables or strands, extending the length of the interventional device are not required when the miniature spectrometer is employed.
Abstract:
A spectroanalytical system includes entrance aperture defining structure for receiving radiation to be analyzed along a first path; dispersion structure in the first path for spatially dispersing the radiation as a function of wavelength; exit aperture structure defining a non-elongate aperture for receiving radiation from the dispersion structure; detector aperture structure coupled to the exit aperture structure for detecting selected wavelengths of the dispersion radiation; and wedge-like conditioner structure disposed between the first path and between the dispersion structure and the entrance and exit aperture structures.
Abstract:
A method and device for wavelength locking is provided, wherein an element having a wavelength dependent characteristic such as a Fabry Perot etalon is used to provide an output signal having an intensity that varies with wavelength. The intensity of a reference signal derived from an input signal is compared with an output from the Fabry Perot etalon to provide a feedback signal that corresponds to the frequency of the input signal. The system is calibrated before wavelength locking is performed to determine a ratio of intensities that determines a locked state or condition.