An optical coherence tomography (OCT) apparatus includes a light source unit to generate light, a coupler unit to generate coupled light using reference light and measurement light generated by splitting the light, split the coupled light into n coupled and split lights and irradiate the n coupled and split lights, wherein n is a natural number greater than or equal to 2, a detection unit to irradiate the incident n coupled and split lights to n spectroscopes respectively and sequentially scan each light separated from each of the spectroscopes by wavelength range, and an image generation unit to generate a 2-dimensional single image using a result of the scanning by the detection unit. Accordingly, it is possible to improve the OCT image acquisition rate by distributing the scan time for a plurality of split lights using a plurality of array detectors.

Disclosed are methods of fabricating an integrated computational element for use in an optical computing device. One method includes providing a substrate that has a first surface and a second surface substantially opposite the first surface, depositing multiple optical thin films on the first and second surfaces of the substrate via a thin film deposition process, and thereby generating a multilayer film stack device, cleaving the substrate to produce at least two optical thin film stacks, and securing one or more of the at least two optical thin film stacks to a secondary optical element for use as an integrated computational element (ICE).

A system includes a computational system to receive a design of an integrated computational element (ICE) including specification of substrate and layers. Additionally, the system includes a deposition source to provide a deposition plume having a plume spatial profile, and a support having a cylindrical surface. The cylindrical surface of the support is spaced apart from the deposition source and has a shape that corresponds to the plume spatial profile in a particular cross-section orthogonal to a longitudinal axis of the cylindrical surface of the support, such that, when the substrate support, with the supported instances of the substrate distributed over the cylindrical surface of the substrate support, is translated relative to the deposition plume along the longitudinal axis of the cylindrical surface of the substrate support, thicknesses of instances of each of the deposited layers are substantially uniform across the plurality of instances of the ICE.

A gas sensor for measuring concentration of a predetermined gas includes a light source (2) arranged to emit pulses of light, a measurement volume (10), a detector (4) arranged to receive light that has passed through the measurement volume (10), and an adaptable filter (6) disposed between the light source (2) and the detector (4). The gas sensor has a measurement state in which it passes at least one wavelength band which is absorbed by the gas and a reference state in which said wavelength band is attenuated relative to the measurement state. A controller is connected to each of the light source, the detector and the adaptable filter to change the adaptable filter between one of said measurement state and said reference state to the other at least once during a gas sensor operation period.

A gas sensor comprises a chamber configured to receive a gas; a light source configured to emit a light wave propagating through the chamber in an emission cone; a measurement photodetector and a reference photodetector, each configured to detect a light wave emitted by the light source and having passed through the chamber. The chamber extends between two transverse walls, arranged opposite one another and connected to one another by a peripheral wall extending therebetween, about a longitudinal axis (Z), and comprising a first reflective segment configured to receive a first portion of the emission cone to reflect it toward the measurement photodetector, thus forming a measurement cone converging toward the measurement photodetector. A second reflective segment of the peripheral wall is configured to receive a second portion of the emission cone to reflect it toward the reference photodetector, thus forming a reference cone converging toward the reference photodetector.

A gas sensor comprises a chamber configured to receive a gas; a light source configured to emit a light wave propagating through the chamber in an emission cone; a measurement photodetector and a reference photodetector, each configured to detect a light wave emitted by the light source and having passed through the chamber. The chamber extends between two transverse walls, arranged opposite one another and connected to one another by a peripheral wall extending therebetween, about a longitudinal axis (Z), and comprising a first reflective segment configured to receive a first portion of the emission cone to reflect it toward the measurement photodetector, thus forming a measurement cone converging toward the measurement photodetector. A second reflective segment of the peripheral wall is configured to receive a second portion of the emission cone to reflect it toward the reference photodetector, thus forming a reference cone converging toward the reference photodetector.

Various embodiments may relate to an optical device. The device may include an elongate substrate, an emitter portion at a distal end portion of the elongate substrate, the emitter portion configured to emit light, and an actuator portion at a proximal end portion of the elongate substrate opposite the distal end portion of the elongate substrate. The emitter portion may include a first electrode, a second electrode, and an active layer between the first electrode and the second electrode so that the light is emitted due to an increase in a temperature of the active layer upon application of a first potential difference between the first electrode and the second electrode. The active layer may be patterned to form a photonic crystal layer for enhancing directionality of the emitted light.

A time-resolved hyper-spectral imaging system for imaging a sample, includes a radiation source suitable for illuminating the sample repeatably, a first optical system configured to form an image I of the sample on a spatial light modulator forming a transmission or reflection mask P, a processor connected to the spatial light modulator and configured to make the transmission or reflection mask P vary for each repetition of the illumination, a second optical system suitable for focusing the radiation transmitted or reflected by the spatial light modulator so as to form, in its image focal plane, a partial image S=P.I, the imaging system being wherein it comprises: a dispersive device comprising a slit placed in the image focal plane of the second optical system, the dispersive device being suitable for spatially splitting the various wavelengths of the radiation transmitted or reflected by the spatial light modulator; a streak camera arranged so as to be illuminated by the radiation issuing from the dispersive device and configured to acquire a plurality of time-resolved partial images of the sample, the images being associated with respective and different transmission or reflection masks P, the streak camera being connected to the processor and the processor also being configured to combine the partial images of the sample so as to construct a 4D image cube I.sub.tot forming an image resolved in time and in wavelength of the sample; and corresponding time-resolved hyper-spectral imaging method for imaging a sample.

A crop growth monitoring device based on multi-rotor unmanned aerial vehicle platform includes a multi-rotor unmanned aerial vehicle, a payload and a ground receiver; the payload part includes a multispectral crop growth sensor module, a signal amplification module, a controller module, a wireless data transmission module, and a power module for power supply and a power supply control module, which are connected in sequence; further comprising a gimbal. The crop growth monitoring device based on the multi-rotor unmanned aerial vehicle platform overcomes the influence on measurement caused by the down-wash flow field of the unmanned aerial vehicle, and can transmit the measured data to the ground receiver in real time for online analysis and processing, realizing continuous, real-time, convenient and large-scope acquisition of crop growth information.

Methods, devices and systems provide improved spectral imaging and detection and can be implemented as compact, light-weight and low-cost devices. An example device includes a mask that includes a plurality of apertures and positioned to receive light from an object of interest. A first lenslet array is positioned to receive light that passes through the plurality of apertures. Each lenslet of the first lenslet array receives the light from a corresponding aperture and produces collimated light that is incident on a dispersive element, such as a diffraction grating or a prism, which produces a plurality of spectrally separated components. A second lenslet array receives the spectrally separated components and focuses each of the spectrally separated components onto an image plane, where a sensor is located. The information obtained from the sensor can be used to determine or analyze spectral characteristics of the object, which can be in gaseous form.