Abstract:
A reflectometer (10) for measuring absorption of light in selected regions of the light spectrum by a diffuse reflector. The reflectometer (10) is adapted to precisely measure absorption resulting from the constituents present in body fluids. The sample (30) to be measured is illuminated by a focused light source (120) at an angle of 45° to its surface. The light diffusely reflected about the normal to the sample (30) falls on a small round bundle (200), the fibers are arranged into a narrow rectangle. This rectangle forms the entrance slit (230) for a concave holographic diffraction grating (230) spectrally separated over a flat field suitable for recording the spectrum on film or on an array of discrete detectors.
Abstract:
Ein Meßkopf, insbesondere für ein Handgerät zur Erfassung von photometrischen Daten, verfügt über eine Beleuchtungsoptik mit einer Asphäre, die eine ringförmig um die Symmetrieachse des Meßkopfes laufende Mulde aufweist, welche im Querschnitt die Gestalt eines Ellipsensegments hat. Die Meßoptik (116) zum Erfassen des vom Meßfleck (57) remittierten Lichtes bildet einen runden Meßfleck (57) auf eine Ellipse am Eintrittsspalt (59) des Monochromators (55) ab, wozu eine sphärisch/zylindrische Linse (132) sowie ein erster Glasstab (148) und ein Glasstab (149) verwendet werden, die jeweils zylindrische Flächen (154, 155, 156, 157) aufweisen, deren zugeordnete Zylinderachsen gekreuzt sind.
Abstract:
A system for rapid-scan spectral analysis comprising a concave holographic diffraction grating (18) continuously rotated at a substantially constant angular velocity to provide a rapid scanning monochromator (a monochromator is used to transfer nominal regions of wavelengths out of the continuous light source). The unique sampling circuitry uses an optical shaft encoder (42). The angular velocity and angular acceleration of the grating (18) are calculated from time measurements, just before the first wavelength of interest falls on the detector. This information is used to control the Analog to Digital converter sampling rate across the region of interest. The samples as a function of time are stored in a memory buffer (58) so that each data point corresponds to a wavelength.
Abstract:
An absorbance, turbidimetric, fluorescence, and nephelometric photometer is constructed by providing a sample cell having a rectangular absorbance/turbidimetric cross-section for radiation. The cells exit aperture is positioned to be the entrance aperture for a grating which separates the light according to wavelength and impingement on an array detector.
Abstract:
An absorbance, turbidimetric, fluorescence, and nephelometric photometer is constructed by providing a sample cell having a rectangular absorbance/turbidimetric cross-section for radiation. The cells exit aperture is positioned to be the entrance aperture for a grating which separates the light according to wavelength and impingement on an array detector.
Abstract:
An improved color sensor is provided having two sources of illumination, one source being modulated on and off while the other source remains on. Data taken while the modulated source is on is compared with data taken while the modulated source is off to compute the effective fluorescence of the sample. A corrected color spectrum can then be determined for a defined source.
Abstract:
A spectrometer 1A includes spectroscopic units 2A, 2B, and 2C. A light passing part 21A, a reflection part 11A, a common reflection part 12, a dispersive part 40A, and a light detection part 22A included in the spectroscopic unit 2A are arranged along a reference line RL1 when viewed in a Z-axis direction. A light passing part 21B, a reflection part 11B, the common reflection part 12, a dispersive part 40B, and a light detection part 22B included in the spectroscopic unit 2B are arranged along a reference line RL2 when viewed in the Z-axis direction. A light passing part 21C, a reflection part 11C, the common reflection part 12, a dispersive part 40C, and a light detection part 22C included in the spectroscopic unit 2C are arranged along a reference line RL3 when viewed in the Z-axis direction. The reference line RL1, the reference line RL2, and the reference line RL3 intersect with one another.
Abstract:
An apparatus includes a substrate transmissive of electromagnetic energy of at least a plurality of wavelengths, having a first end, a second end, a first major face, a second major face, at least one edge, a length, a width, and a thickness, at least a first nanostructure that selectively extracts electromagnetic energy of a first set of wavelengths from the substrate; and an input optic oriented and positioned to provide electromagnetic energy into the substrate via at least one of the first or the second major face of the substrate. Nanostructures can take the form of photonic crystal arrays, a plasmonic structure arrays, or holographic diffraction gratings. The apparatus may be part of a spectrometer.
Abstract:
A device for use with a smart phone or tablet, the device comprising: a measurement device including a light source comprising a plurality of light emitting diodes for measuring one or more physiological parameters, the measurement device configured to generate an input optical beam with one or more optical wavelengths, wherein at least a portion of the one or more optical wavelengths is a near-infrared wavelength between 500 nanometres and 2500 nanometres; the measurement device comprising one or more lenses configured to receive and to deliver a portion of the input optical beam to a sample, wherein the sample reflects at least a portion of the input optical beam delivered to the sample; the measurement device further comprising a receiver to receive at least a portion of the input optical beam reflected from the sample; the light source configured to increase a signal-to-noise ratio of the input optical beam reflected from the sample, wherein the increased signal-to-noise ratio results from an increase to the light intensity from at least one of the plurality of light emitting diodes and from modulation of at least one of the plurality of light emitting diodes; and the measurement device configured to generate an output signal; the device configured to communicate with the smart phone or tablet, the smart phone or tablet comprising a wireless receiver, a wireless transmitter, a display, a voice input module, a speaker, and a touch screen, the smart phone or tablet configured to receive and to process at least a portion of the output signal, wherein the smart phone or tablet is configured to store and display the processed output signal, wherein at least a portion of the processed output signal is configured to be transmitted over a wireless transmission link.