Abstract:
Aspects of a tandem dispersive range monochromator are described herein. In one embodiment, the monochromator includes a light source that provides broadband light, a tandem diffraction grating including a first diffraction grating and a second diffraction grating, a grating drive motor that rotates the tandem diffraction grating to provide dispersed wavelengths of light, a detector that detects a portion of the dispersed wavelengths of light, and processing circuitry that controls a grating drive motor to regulate an angular velocity of the tandem grating based on an angular orientation of the tandem diffraction grating. By using a tandem diffraction grating having different dispersive surfaces, measurements of relatively high precision and quality may be taken throughout a wider spectral range. In another aspect, the processing circuitry controls a sample drive motor to vary an angle of incidence of the dispersed wavelengths of light onto a sample for evaluation.
Abstract:
Photoluminescence quantum yield (PLQY) testing of quantum dots is described. In one embodiment, a method involves heating a sample including quantum dots and illuminating the sample with a light source. The method involves measuring spectra of luminescence from the illuminated quantum dots of the sample at each of a plurality of temperatures. The method involves measuring each of the plurality of temperatures with a temperature sensor. The PLQY at each of the plurality of temperatures is computed based on the measured spectra. The method further involves computing a relationship between QD emission wavelength of the measured spectra and the plurality of temperatures measured with the temperature sensor. The relationship is used to determine the QD temperature corresponding to each of the PLQY computations. In one embodiment, an integrating sphere moves on a gantry over the samples.
Abstract:
A device for measuring calories of food items includes a food item holding unit on which an inspection-target food item including a plurality of food materials is placed, a light source for radiating near-infrared rays at a specific wavelength region to the food item, and a light reception unit that receives light emitted from the light source and then reflected from the food item. The light receiving device receives light reflected from the food item when the near-infrared rays at the specific wavelength are radiated to the food item. A control unit calculates calories of the food item in accordance with measurement values of absorbances of the near-infrared rays at the specific wavelength region which are received by the light reception unit.
Abstract:
Embodiments of the present disclosure include an optical probe capable of communicating identification information to a patient monitor in addition to signals indicative of intensities of light after attenuation by body tissue. The identification information may indicate operating wavelengths of light sources, indicate a type of probe, such as, for example, that the probe is an adult probe, a pediatric probe, a neonatal probe, a disposable probe, a reusable probe, or the like. The information could also be utilized for security purposes, such as, for example, to ensure that the probe is configured properly for the oximeter, to indicate that the probe is from an authorized supplier, or the like.
Abstract:
Aspects of the subject technology relate to methods and systems for identifying a target material. The system includes a tunable laser, an imaging device, and a signal processor. The tunable laser is configured to intermittently direct electromagnetic radiation of at least one selected wavelength at a surface of a target material. The imaging device is configured to capture at least one “on” image of the surface when the electromagnetic radiation of the at least one selected wavelength is directed at the surface and capture at least one “off” image of the surface when electromagnetic radiation of the at least one selected wavelength is not directed at the surface. The signal processor is configured to compare, for each selected wavelength, the “on” image(s) corresponding to the selected wavelength with the “off” image(s) corresponding to the selected wavelength and identify the target material based on the comparison.
Abstract:
A displacement sensor includes a light source unit configured to apply light with different plural wavelengths in a direction oblique to a measurement region of a planar measured object, a spectroscope configured to measure spectral distribution of light reflected by the measurement region, a feature amount extracting module configured to extract a feature amount of the spectral distribution, and a displacement calculating module configured to calculate displacement of the measurement region based on the extracted feature amount and a relation between displacement and a feature amount acquired previously.
Abstract:
A method for reducing dimensionality of hyperspectral images includes receiving a hyperspectral image having a plurality of pixels. The method may further include establishing an orthonormal basis vector set comprising a plurality of mutually orthogonal normalized members. Each of the mutually orthogonal normalized members may be associated with one of the plurality of pixels of the hyperspectral image. The method may further include decomposing the hyperspectral image into a reduced dimensionality image, utilizing calculations performed while establishing said orthonormal basis vector set. A system configured to perform the method may also be provided.
Abstract:
An image forming apparatus includes an image forming unit configured to form a measurement image on a sheet, a measurement unit configured to radiate light on the measurement image via a transparent window, and measure the light reflected from the measurement image, a white reference plate of which a white level is measured by the measurement unit, a black member of which a black level is measured by the measurement unit, and a determination unit configured to determine, based on a change in a measurement result of the white reference plate and a change in a measurement result of the black member measured by the measurement unit, whether the white reference plate, the black member, or the window is soiled.
Abstract:
An automated adaptive optics and laser projection system is described. The automated adaptive optics and laser projection system includes an adaptive optics system and a compact laser projection system with related laser guidance programming used to correct atmospheric distortion induced on light received by a telescope. Control of the automated adaptive optics and laser projection system is designed in a modular manner in order to facilitate replication of the system to be used with a variety of different telescopes. Related methods are also described.
Abstract:
A component analyzer includes a casing, a light source unit, a light incident unit guiding light from a test object into the casing, a tunable interference filter extracting light having a predetermined wavelength from the incident light, an imaging unit receiving the extracted light and taking a spectroscopic image, a control unit performing a component analysis of the test object based on the spectroscopic images, and a display displaying a component analysis result. The light incident unit, the imaging unit, and the control unit are provided within the casing. The tunable interference filter includes a fixed substrate having a fixed reflection film and a movable substrate provided to face the fixed substrate and having a movable reflection film opposed to the fixed reflection film across a gap between reflection films, and an electrostatic actuator changing the gap between reflection films.