A measurement system of photoluminescence properties of a sample, comprises a radiation source module configured to generate a first radiation, an excitation optical path coupled to the radiation source module, a support structured to support a sample to be optically coupled to excitation optical path and adapted to provide a photoluminescence radiation, and collection path coupled to the sample and configured to propagate the photoluminescence radiation. The system also includes an analysis device configured to receive the photoluminescence radiation and provide data/information on photoluminescence properties of sample. At least one path between the excitation path and the collection path comprises a respective adjustable birefringent common-path interferometer module configured to produce first and second radiations adapted to interfere with each other.

An optical module includes a mirror unit and a beam splitter unit. The mirror unit includes a base with a main surface, a movable mirror, a first fixed mirror, and a drive unit. The beam splitter unit constitutes a first interference optical system for measurement light along with the movable mirror and the first fixed mirror. A mirror surface of the movable mirror and a mirror surface of the first fixed mirror follow a plane parallel to the main surface and face one side in a first direction perpendicular to the main surface. The movable mirror, the drive unit, and at least a part of an optical path between the beam splitter unit and the first fixed mirror are disposed in an airtight space.

A spectrometer is disclosed, comprising: a light source configured to receive light from a scene; a diffraction grating configured to receive a light beam from the light source and to disperse the light beam to form a dispersed light beam, the diffraction grating comprising an axis of normal incidence and a plurality of grooves, these defining a plane that includes the axis of normal incidence and which is normal to the grooves; a detector configured to detect the dispersed light beam; wherein the angle of incidence, between the light beam and the axis of normal incidence in the plane, is 5 to 8 degrees, and the out-of-plane angle, between the light beam and the axis of normal incidence outside the plane is 1.5 to 4 degrees. A correcting lens may be provided, disposed between the diffraction grating and the detector.

The absorbance of a mixed sample at multiple wavelengths is determined and the concentrations of the sample constituents deduced from the observed absorbances. Assuming the sample constituents are known, these wavelengths correspond to peak absorption wavelengths for the constituents. Rather than attempt to generate an analytical relationship among absorbance levels and constituent concentrations, a database of absorbance values for each wavelength, spanning the range of possible analyte concentrations, is employed instead. In general, the wavelengths utilized correspond to peak absorption wavelengths for each of the analytes.

Color information obtained by an optical sensor of a stylus can be displayed at a pen tip of the stylus with good visibility, and visual feedback is provided as a suitable user interface when the color information is transmitted from the stylus to an electronic apparatus. A stylus includes: a trigger signal generating circuit; an optical sensor that detects incident light; a memory circuit that stores color information of the incident light detected by the optical sensor; a color presenting circuit which is disposed at a pen tip of the stylus and which presents a color corresponding to the color information; and a control circuit. The control circuit presents the color information detected by the optical sensor using the color presenting circuit at the pen tip, and controls the color presenting circuit in response to a trigger signal from the trigger signal generating circuit when transmitting the color information to the electronic apparatus.

Systems and methods for filtering an optical beam are described. In one implementation, a system for filtering an input optical beam includes a first beamsplitter, a first spectral slicing module, a second spectral slicing module, and a second beamsplitter. The first beamsplitter is configured to split the input optical beam into a first optical beam and a second optical beam. The first spectral slicing module has a first passband and is configured to filter the first optical beam. The second spectral slicing module has a second passband and is configured to filter the second optical beam. The second beamsplitter is configured to combine the first optical beam and the second optical beam into an output optical beam. The first and second spectral slicing modules may each comprise a longpass filter and a shortpass filter aligned along its optical axis, and the longpass filter and/or the shortpass filter are rotatable relative to the optical axis. Advantageously, the optical system allows for tunable spectral filtering of the input optical beam suitable for 2-D imaging systems.

A light detection device includes a package including a window, a Fabry-Perot interference filter for transmitting light incident from the window in the package, and a light detector for detecting the light transmitted by the Fabry-Perot interference filter in the package. The Fabry-Perot interference filter includes: a substrate having a first surface on the window side and a second surface on the light detector side; a first layer structure arranged on the first surface, the first layer structure having a first mirror and a second mirror, and a lens unit integrally formed on the second surface side, the lens unit for condensing the light transmitted by the first mirror and the second mirror onto the light detector.

System and method for performance characterization of multi configuration near eye displays includes: a mirror; a lamp; a beamsplitter; a collimating and reflective lens for collimating light reflected from the beamsplitter and reflecting it back towards an image sensor having a view finder; a field-of-view (FOV) aperture to project light from the lamp onto the DUT through the objective lens; a video viewfinder digital camera for capturing an virtual image of the DUT; a spectroradiometers for performing spectroradiometric measurements on a captured image of the defined measurement area to characterize the performance of the DUT; and a controller circuit for characterizing performance of the DUT based on the spectroradiometric measurements.

A device comprising a circuitry configured to obtain a sequence of digital images from an image sensor; select a region of interest within a digital image of the sequence of digital images; perform motion compensation on the region of interest to obtain a motion compensated region of interest based on motion information obtained from the sequence of digital images and a predefined accumulated time interval; define a mask pattern based on the compensated region of interest; apply the mask pattern to an electronic light valve.

A mirror unit 2 includes a mirror device 20 including a base 21 and a movable mirror 22, an optical function member 13, and a fixed mirror 16 that is disposed on a side opposite to the mirror device 20 with respect to the optical function member 13. The mirror device 20 is provided with a light passage portion 24 that constitutes a first portion of an optical path between the beam splitter unit 3 and the fixed mirror 16. The optical function member 13 is provided with a light transmitting portion 14 that constitutes a second portion of the optical path between the beam splitter unit 3 and the fixed mirror 16. A second surface 21b of the base 21 and a third surface 13a of the optical function member 13 are joined to each other.