774results about "Spectrum generation using multiple reflection" patented technology

One embodiment provides a compressive hyperspectral imaging system. The compressive hyperspectral imaging system can include a coded aperture configured to spatially encode an optical signal associated with a scene, an integrated photonic device configured to disperse the spatially encoded optical signal, and an array of photo detectors configured to detect the dispersed and spatially encoded optical signal. The output of the array of photo detectors is used for reconstruction of a hyperspectral image corresponding to the scene.

A device including a stack of silicon meta-optical layers forming a meta-material comprising an input surface for receiving terahertz electromagnetic radiation, an output surface for outputting a plurality of beams of the electromagnetic radiation; and a spatially varying permittivity varying with sub-wavelength precision across a volume of the stack, wherein the spatially varying permittivity is configured to focus different spectral bands of the electromagnetic radiation into different spatially separated electromagnetic modes.

A multipass cell (300) comprising: a first reflector arrangement (305A, 305B); and a second reflector arrangement (307), the first (305A, 305B) and second (307) reflector arrangements defining an optical cavity (315) therebetween and the cell; wherein the first reflector arrangement (305A, 305B) is configured such that light incident on the first reflector arrangement (305A, 305B) is at least partially retroreflected towards the second reflector arrangement (307), wherein the second reflector (307) arrangement comprises a concave surface that is reflective, wherein at least one of the first (305A, 305B) and second (307) reflector arrangements comprises an aperture (306) for allowing light to enter and / or exit the optical cavity (315).

The invention discloses a multi-component gas detection device and method based on a metasurface quasi-continuous domain bound state. The advanced nanometer manufacturing technology and the deep learning algorithm are adopted, and high-precision, high-sensitivity and high-selectivity gas detection is achieved. According to the invention, the metasurface array with specific design is utilized, and the quasi-continuous domain bound state in the middle-infrared band is realized by accurately regulating and controlling the geometric parameters and material characteristics of the microstructure, so that excellent optical response is obtained. In combination with a deep learning algorithm, complex spectral information is converted into accurate gas composition and concentration information, and a reliable solution is provided for the fields of environmental monitoring, industrial production, safety monitoring and the like.

Provided are a method and a device for characterizing a resonator element, a method and a device for providing an optical frequency reference, a LIDAR system and a gas sensing system. The method includes coupling a laser light into the resonator element, the resonator element having multiple carrier resonances for the carrier frequency of the laser light.

The invention discloses a reconstruction spectral imaging system based on an electromagnetic drive Fabry-Perot resonant cavity, and belongs to the field of spectral imaging. The system comprises an optical lens group, an electromagnetic driving device, a Fabry-Perot resonant cavity, a photoelectric detection array and a calculation unit, the cavity length of the Fabry-Perot resonant cavity can be adjusted through the electromagnetic driving device. The optical lens group receives light reflected or emitted by an external to-be-measured target scene and carries out collimation processing, and then the light enters the Fabry-Perot resonant cavity. The Fabry-Perot resonant cavity screens the incident light based on the resonance condition of the cavity length of the Fabry-Perot resonant cavity, and the screened light is emitted to the photoelectric detection array; the photoelectric detection array converts the incident light intensity into an electric signal and outputs the electric signal to the calculation unit; and a spectrum reconstruction model is built in the calculation unit, and a hyperspectral image of the to-be-measured target scene is obtained by using the spectrum reconstruction model based on the electric signal. The working range and the spectral imaging precision of the spectral imaging system based on the Fabry-Perot resonator are improved, the technological requirements are reduced, and the engineering applicability of the spectral imaging system based on the Fabry-Perot resonator is improved.

A light detection device includes a filter array including filters including first and second filters and an image sensor that includes pixels and detects light transmitted through the filter array. A first transmission spectrum of the first filter having local maxima differs from a second transmission spectrum of the second filter having local maxima. The filters are arranged in a matrix pattern along first and second directions crossing each other. The pixels are arranged in a matrix pattern along third and fourth directions crossing each other. At least one of Rp1 or Rp2 differs from 1. The Rp1 is a quotient obtained by dividing a pitch of the filters in the first direction by a pitch of the pixels in the third direction. The Rp2 is a quotient obtained by dividing a pitch of the filters in the second direction by a pitch of the pixels in the fourth direction.

A system and method of instantaneously acquiring a spatio-spectral cube image from a sample material, using a perturbative mosaic array element, configured in correspondence with a photo-detecting pixel array sensor.

Disclosed is a linear array scanning Brillouin scattering elastic imaging device. In the device, a signal generating system consists of a narrow linewidth continuous wave laser, a half-wave plate, a beam expander, a Y-direction scanning galvanometer, a microlens array, a pinhole array filter, a first plano-convex lens, a polarization beam splitter, a quarter-wave plate and a microscope objective. A signal receiving system consists of a microscope objective, a quarter-wave plate, a polarization beam splitter and an eight-channel optical collimator array. Each channel of an eight-channel spectrometer consists of an optical collimator, a convex lens, a scanning Fabry-Perot interferometer, a photomultiplier tube and an eight-channel photon collection card.

A variable optical filter is disclosed including a bandpass filter and a blocking filter. The bandpass filter includes a stack of alternating first and second layers, and the blocking filter includes a stack of alternating third and fourth layers. The first, second and fourth materials each comprise different materials, so that a refractive index of the first material is smaller than a refractive index of the second material, which is smaller than a refractive index of the fourth material; while an absorption coefficient of the second material is smaller than an absorption coefficient of the fourth material. The materials can be selected to ensure high index contrast in the blocking filter and low optical losses in the bandpass filter. The first to fourth layers can be deposited directly on a photodetector array.

The invention discloses a combined optical filter multispectral imaging sensor and method. Relates to the technical field of sensors, in particular to the technical field of combined optical filter multispectral imaging. According to the method, the problem that wide-range and high-precision spectrum adjustment cannot be considered in the prior art is effectively solved, and the precision of multispectral spectrum section selection and weak and small target detection and recognition is improved. The imaging sensor comprises an imaging sensor, an optimized multispectral optical filter array and an optimized liquid crystal tunable optical filter; the imaging method comprises the following steps: a target background image enters the combined optical filter multispectral sensor to obtain narrow-band light of N wavebands and light to be tuned; converting the narrow-band light of the N wavebands and the light to be tuned into image signals; recovering a three-dimensional spectral image, and carrying out rough detection by combining an optical filter multispectral sensor; finely adjusting the combined optical filter multispectral sensor; and spectral imaging.

The invention discloses a cavity enhanced Fabry-Perot interference resonant cavity, and belongs to the technical field of sensing detection. The transduction film is used as a transduction medium, vibration is generated through induction, signals are converted into vibration of the film, optical signals are modulated, and information to be measured can be obtained. According to the invention, the cavity enhancement structure is introduced, the optical fiber collimator and the transduction film jointly form an interference resonant cavity, and the phase sensitization of the optical microcavity is realized by improving the reflectivity of the cavity and prolonging the time of capturing light. Through stable interference of the resonant cavity, strong optical constraint is generated, and interaction between a light beam and a transmission signal is enhanced. In addition to the characteristics of high sensitivity, small loss, small size and high integration, the device has high expandability in the design aspects of bandwidth and sensitivity, and good sensing performance and design flexibility of the device provide a new opportunity for propelling the military and civil fields such as monitoring technology and biomedicine.

The invention belongs to the technical field of optical fiber sensing, and discloses an optical fiber seawater salinity sensor with a temperature self-compensation function, a preparation method and a test system. The sensor is based on a single-mode fiber-hollow fiber-single-mode fiber (SHS) structure partially filled with a temperature-sensitive material, and simultaneously excites Fabry-Perot interference and an anti-resonance effect. The femtosecond laser micromachining technology is adopted for optical fiber microdefect etching, temperature-sensitive material filling and seawater flowing into the SHS structure through the microdefects are facilitated, the problem that the anti-resonance phenomenon cannot be excited under the liquid immersion condition is solved, and high-sensitivity salinity measurement is achieved. The temperature crosstalk in the salinity measurement process is compensated based on the temperature-sensitive material filled Fabry-Perot interferometer, and the measurement error is reduced. The optical fiber sensor is compact in structure, has good stability, repeatability and reproducibility, has wide application potential in the field of microfluidics, and provides technical support for application of optical sensing in the ocean.

To provide a light measuring device and a method for measuring light which can suppress increase of measurement errors and enlarge a dynamic range by inserting an optical attenuation member into an optical path for measurement target light or removing the optical attenuation member from the optical path for measurement target light.SOLUTION: The light measuring device includes: a division optical system for dividing a measurement target light from a measurement target object into plural measurement target lights; a wavelength selection filter which the measurement target lights formed by division by the division optical system enter; and a color measurement optical system having a light reception sensor for receiving the measurement target light having passed through the wavelength selection filter. The light measuring device further includes a light attenuation member which can be inserted into an optical path for measurement target light or can be removed from the optical path for measurement target light, and the light attenuation member is arranged ahead of the division optical system.SELECTED DRAWING: Figure 1

A filter device that enables highly sensitive and highly accurate detection is provided. [Solution] The filter device includes a package (2) having a window (15), a bandpass filter (14) disposed on the inner surface of the package (2), and a Fabry-Perot interference filter (10A) disposed within the package (2). When viewed from the direction of light incidence, the outer edge of the bandpass filter (14) is located outside the outer edge of the Fabry-Perot interference filter (10A). The Fabry-Perot interference filter (10A) includes a substrate, a first layer structure disposed on a first surface of the substrate facing the window (15), and a lens portion integrally provided on a second surface of the substrate opposite the window (15). The first layer structure includes a first laminate including a first mirror portion, an intermediate layer forming a gap, and a second laminate including a second mirror portion. When viewed from the direction of light incidence, the lens portion is located inside the gap.

A composite optical filter may include a substrate, a communal optical filter, one or more first optical filters, and one or more second optical filters. The communal optical filter may be formed on a first surface of the substrate. The one or more first optical filters may be formed on one or more first portions of a second surface of the substrate and may be configured to pass light associated with a first wavelength. The one or more second optical filters may be formed on one or more second portions of the second surface of the substrate and may be configured to pass light associated with a second wavelength.

To increase variable speeds in a wavelength variable bass-pass filter of SBS type.SOLUTION: Provided is a wavelength variable band-pass filter using Simulated Brillouin Scattering (SBS), comprising: a light source for outputting SBS pump light based on a set wavelength; an SBS medium which the SBS pump light and the signal light to be filtered are inputted to, and which outputs part of SBS-amplified signal light; and a path control unit located between the light source and the SBS medium, for forwarding input from the SBS medium to an output terminal while outputting input from the light source to the SBS medium. The light source is a Dispersion-Tuned Mode-Locked Laser (DTMLL).SELECTED DRAWING: Figure 6

An apparatus (500) for spectral measurements comprises: - an illuminating unit (110) to form narrowband light pulses (B2t1, B2t2) at different wavelengths (λ1,λ2) for illuminating an object (OBJ1) with the narrowband light pulses (B2t1, B2t2) - a sensor (SEN1) to detect light (B3) received from the object (OBJ1), - a control unit (CNT1) to control operation of the sensor (SEN1), wherein the illuminating unit (110) comprises: - a broadband light source (LS1) to generate broadband light pulses (B1), - a Fabry-Perot interferometer (FPI1) to form narrowband light pulses (B2) by filtering the broadband light pulses (B1), wherein the broadband light source (LS1) is arranged to generate a first broadband light pulse (B1t1) at a first trigger time (t1), and to generate a second broadband light pulse (B1t2) at a second trigger time (t2), wherein the Fabry-Perot interferometer (FPI1) is tunable by moving a mirror (M2) of the Fabry-Perot interferometer (FPI1), wherein the illuminating unit (110) is arranged to operate such that a movement of the mirror (M2) is not stopped between the first trigger time (t1) and the second trigger time (t2), wherein a start time (tA1) of a first exposure time (ΔtEX1) of the sensor (SEN1), and a duration of the first exposure time (ΔtEX1) are controlled such that the illuminating unit (110) forms the first broadband light pulse (B1t1) and the second broadband light pulse (B1t2) during the first exposure time (ΔtEX1).

A light detection device of the present invention includes: a wiring board; a first support part disposed on a mounting surface of the wiring board; a Fabry-Perot interference filter having a first mirror part and a second mirror part between which a distance is variable and having an outer edge portion disposed in a first support region of the first support part; a light detector disposed on the mounting surface to face the first mirror part and the second mirror part on one side of the first support part; and a temperature detector disposed on the mounting surface, wherein the temperature detector is disposed on the mounting surface such that at least a part of the temperature detector overlaps a part of the Fabry-Perot interference filter when seen in a first direction perpendicular to the mounting surface and such that at least a part of the temperature detector overlaps a part of the first support part when seen in a second direction in which the first support part and the light detector are aligned with each other, and wherein a first distance between the temperature detector and the first support part in the second direction is smaller than a first width of the first support region in the second direction.

The invention discloses a DNA biosensor based on a reflection interference spectrum, a preparation method and application of the DNA biosensor to detection of doxorubicin. The DNA biosensor is characterized in that uniformly distributed nanopores are processed in the upper surface of an anodic aluminum oxide substrate, a copper layer is arranged on the upper surface of the anodic aluminum oxide substrate outside the nanopores, probe ssDNA is connected to the walls of the nanopores through Schiff base bonds, and target ssDNA is connected to the probe ssDNA. According to the present invention, the optical signal change during the process of filling the drug molecules into the DNA molecules can be monitored in real time through the reflection interference spectrum technology, the long-time incubation and washing steps are not required, the detection time is substantially shortened, the rapid detection requirement is met, and the timely detection result is provided especially for the doxorubicin detection application.

Method for calibrating a spectral imaging device comprises forming first calibration light by illuminating a first calibration region of a calibration sample with illuminating light, forming second calibration light by illuminating a second calibration region of the calibration sample with the illuminating light, measuring a first spectrum of the first calibration light by using the spectral imaging device, measuring a second spectrum of the second calibration light by using the spectral imaging device, and determining or verifying a spectral calibration function of the spectral imaging device by comparing the measured spectra with reference spectra. The spectral calibration function specifies a relation, which associates values of a control parameter with actual spectral positions. The first calibration light has a first spectral peak at a first peak wavelength, and the second calibration light has a second spectral peak at a second peak wavelength.

An optical filter may include: an interference filter that allows at least two channels associated with at least two transmission peaks to pass through; and a plurality of blockers, wherein each of the plurality of blockers allows a corresponding channel associated with a corresponding transmission peak among the at least two transmission peaks to pass through, and blocks one or more channels other than the corresponding channel associated with the corresponding transmission peak.

A photodetection device includes: a filter array including a plurality of filters arranged in a two-dimensional array, the plurality of filters including a first filter and a second filter, the first filter and the second filter each including a first reflective layer, a second reflective layer, and an intermediate layer between the first reflective layer and the second reflective layer and having a resonant structure having a plurality of resonant modes differing in order from each other, at least one selected from the group consisting of a refractive index and a thickness of the intermediate layer of the first filter being different from the at least one selected from the group consisting of a refractive index and a thickness of the intermediate layer of the second filter; and an image sensor disposed at a position where the image senor receives light having passed through the filter array.

Refractory anchoring devices include a main body and a mounting feature for mounting to a thermal vessel. The main body has the shape of two end-to-end Y's forming a central segment, branch segments extending from ends of the central segment, and extension segments extending from the branch segments, to collectively form four unenclosed cell openings that are semi-hexagonally shaped. Some embodiments include reinforcement segments extending into respective cell openings, voids extending through respective adjacent branch and extension segments, an underbody gap under the central segment, a single stud-welding stud for the mounting feature, and / or a collar-and-stud connection between the anchor main body and a stud-welding stud of the mounting feature. Refractory anchoring systems and methods include an array of the refractory anchoring devices arranged and mounted so that the unenclosed semi-hexagonal cell openings of adjacent anchoring devices cooperatively form substantially hexagonal cells.

To provide a spectroscopic unit and spectroscopic module that can perform measurements with high precision. [Solution] The spectroscopic unit 110 includes a Fabry-Perot interference filter 10 having a pair of mirrors whose distance from each other is variable, an optical system 50 having a first lens 51 that focuses light from an object M onto the Fabry-Perot interference filter 10, and a photodetector 8 that detects light transmitted through the Fabry-Perot interference filter 10. When the distance D1 from the first lens 51 to the object M is 5 cm, and a circular area on the surface of the object M with a diameter D2 of 1 cm is defined as the field of view region A, the optical system 50 is configured to allow light with a divergence angle of 1 degree or less to enter the light transmission region of the Fabry-Perot interference filter 10, while preventing light with a divergence angle greater than 1 degree from entering the light transmission region of the Fabry-Perot interference filter 10 from entering the light transmission region.

A light detection device includes: a Fabry-Perot interference filter provided with a light transmission region; a light detector configured to detect light transmitted through the light transmission region; a package having an opening and accommodating the Fabry-Perot interference filter and the light detector; and a light transmitting unit arranged on an inner surface of the package so as to close an opening, the light transmitting unit including a band pass filter configured to transmit light incident on the light transmission region. When viewed from a direction parallel to the line, an outer edge of the Fabry-Perot interference filter is positioned outside an outer edge of the opening, and an outer edge of the light transmitting unit is positioned outside the outer edge of the Fabry-Perot interference filter.

A method for calibrating the driving parameters of an optical component within its operating wavelength range. The method includes placing a material layer in an optical path, the material layer being substantially planar and substantially transparent, and having a thickness on the order of wavelengths within the range; operating the component to change the driving parameters while detecting light transmitted through the material layer to obtain driving parameter and light intensity data. The obtained data is then compared with previously derived characterization data for the material layer to calibrate the driving parameters.