60 results about "Wavelength filter" patented technology

A miniaturized interferometric integrated photonic gyroscope structure with top silicon oxide, middle silicon oxide and bottom silicon oxide deposited on a silicon substrate comprises broadband optical source or a semiconductor optical amplifier with silicon nitride ring resonator wavelength filter, connected with a thin film lithium niobate or piezoelectrically actuated silicon nitride phase modulator vertically coupled with a silicon nitride waveguide spiral loop. The silicon nitride waveguide spiral loop is patterned on thin bottom oxide layer with air trenches below it and connected with a germanium detector either through photonic wire bonding or vertically integrated through reflecting mirror embedded into silicon wafer. Various methods of coupling alternative materials are described and the potential of connecting several spiral waveguides for enhanced sensitivity in a gyroscope application.

The invention provides a refrigerant gas leakage type detection method and device, electronic equipment and a storage medium. The method comprises the steps that leaked refrigerant gas to be detected is collected; an infrared light source is controlled to emit infrared light, and the infrared light passes through the leaked refrigerant gas and then enters a double-channel optical filter; obtaining first infrared light which is filtered by the dual-channel optical filter, is used for detecting the type of the refrigerant gas and has a first wavelength, and second infrared light which is used for eliminating environmental influence and has a second wavelength; calculating a carbon-hydrogen bond equivalent concentration matching value of the leaked refrigerant gas according to the first infrared light and the second infrared light; the heat conductivity of the leaked refrigerant gas is obtained; calculating a heat conductivity matching value of the leaked refrigerant gas according to the heat conductivity and the standard heat conductivity of the standard refrigerant gas; and determining the gas type of the leaked refrigerant gas according to the carbon-hydrogen bond equivalent concentration matching value and the thermal conductivity matching value. According to the invention, the leakage refrigerant gas type can be automatically identified, and the identification accuracy is high.

The invention discloses a sulfur hexafluoride non-dispersive infrared spectrum detection device which comprises a shell, a sample gas chamber is arranged in the shell, an infrared source is arranged on one side of the sample gas chamber, light holes are formed in the two sides of the sample gas chamber at equal intervals, and infrared detectors are arranged on the side, away from the infrared source, of the sample gas chamber at equal intervals. The invention relates to the technical field of gas detection, through the cooperation of the shell, the sample gas chamber, the infrared source, the light hole, the wavelength filter, the infrared detector, the gas guide structure, the sealing structure and the gas supply monitoring assembly, the sealing structure is used for sealing the light hole of the sample gas chamber and filtering the sample gas, so that dust and other impurities are prevented from being sucked into the sample gas chamber, and the detection efficiency is improved. The sulfur hexafluoride detection device has the advantages that the sample gas is collected, the conveying state of the sample gas is monitored, the stable conveying of the sample gas is ensured, the accuracy and stability of a detection result are improved, the service life of the detection device is prolonged, the interference of an external environment on the detection result is effectively avoided, and the sulfur hexafluoride detection device has wide applicability in a severe environment.

The invention relates to an inverse wavelength filter and a use method thereof. The inverse wavelength filter comprises a Lyot filter and a variable stress controller, wherein the Lyot filter consists of a polarization maintaining optical fiber with the length of 0.25 m and a polarizer with a high extinction ratio; the variable stress controller is connected with a section of polarization-maintaining tail fiber with the length of 0.05 m at the tail end of the polarization-maintaining optical fiber through a holder; the variable stress controller is used for continuously twisting and bending the polarization maintaining optical fiber; the distortion angle and the bending angle of the polarization-maintaining optical fiber are used for respectively controlling the central wavelength and the waveform left-right symmetry degree of an optical path passing through the polarization-maintaining optical fiber; the distortion angle and the bending angle of the polarization maintaining optical fiber are in linear relation with the driving current of the variable stress controller. According to the invention, spectral shape online correction of other optical paths such as fiber-optic gyroscopes can be realized.

The invention discloses an integrated pixel-level composite metasurface device for multiband imaging. The integrated pixel-level composite metasurface device comprises a substrate, a metasurface band-pass filter and a metasurface lens which are sequentially arranged in the direction of an optical path. According to the invention, based on the composite metasurface design of filtering and wavefront shaping, the incident light with different wavelengths filtered by the metasurface band-pass filter is focused to the corresponding pixel active area through the metasurface lens, the efficiency reduction caused by insufficient fill factors is avoided, and the technical characteristics of low crosstalk and high efficiency are realized. The micro-lens array is compatible with a semiconductor process, avoids the tedious steps of separate design and processing of a conventional filter and a micro-lens array, and can realize pixel-level alignment mounting or monolithic integration with an imaging device.

An optical transmitter that multiplexes wavelength channels includes: a first light source; one or more second light source each having a different wavelength; collimator lenses coupled to respective outputs of the first and second light sources; an optical multiplexer that causes an output light beam from the first light source to be transmitted from a first end surface to a second end surface, causes the output light beam from the first light source to be reflected by a reflecting mirror, causes an output light beam from the second light source to pass through a wavelength filter, causes the output light beam from the second light source to be reflected by the reflecting mirror, and causes output light beams of the respective wavelength channels, to sequentially multiplex the output light beams of the respective wavelength channels; and beam splitters respectively inserted between the collimator lenses and the first end surface.

An input device assesses an object in a field of view using multi-wavelength reflectance spectroscopy to determine if the object is an actual user or an artifact. Light sources are operated to illuminate an object. For example, the object may be illuminated with white, violet, and infrared light simultaneously. A spectrometer comprising a plurality of detectors, each with associated wavelength filters determines intensity data indicative of intensity of light of these different colors as reflected from the object. The intensity data is processed to determine whether the object is part of a user or is an artifact. For example, if the object is deemed to be a user, biometric input may be acquired. The biometric input may then be processed to identify the user. The input device may be used at various locations, such as at an entry portal, point of sale, under direct solar illumination, and so forth.

The application discloses an AOI equipment light intensity curve generation method, system and device and a storage medium, relates to the technical field of light intensity curve generation, and comprises the following steps: in the optical scene of the randomly selected wavelength filter, the optical attenuating sheet placed in the first gear and the second gear and the illumination light source output power increased in the first preset step, the first reference curve and the second reference curve are determined based on the light power value under different illumination light source output powers; the target reference curve is determined according to the first reference curve and the second reference curve; in the optical scene of the reference wafer, the optical attenuating sheet placed in the first gear or the second gear and the illumination light source output power increased in the second preset step under different preset target objectives and the corresponding target wavelength filter, the light intensity curve vertex value is determined based on the reference wafer image gray value, the target reference curve and the preset coefficient; and the target light intensity curve is determined according to the light intensity curve vertex value and the target reference curve. The application can efficiently generate the light intensity curve with strong universality.

Provided is an ophthalmological lens configured to provide a near-sightedness progression suppression effect using a monochromatic aberration of a pencil that is a bundle of rays passing through the ophthalmological lens and passing through a pupil, the ophthalmological lens including a wavelength filter for attenuating light of a long wavelength longer than a set dominant wavelength, and technology related thereto.

A wavelength-tunable laser includes a substrate, a waveguide layer over the substrate, and a cladding over the waveguide layer. The wavelength-tunable laser further includes an active layer in a part of the waveguide layer, and a tunable wavelength filter in at least one end region of the waveguide layer in a direction along which light is to be guided.

A frequency-chirped integrated silicon-photonic laser may be provided with separate gain and phase-tuning sections in the laser cavity, one or two wavelength filters forming part of the reflective structures defining the cavity, and electro-optic and optionally thermo-optic intra-cavity and filter phase tuners. The electro-optic phase tuners may be driven with synchronized voltage waveforms, at amplitudes determined, based on measurements of the laser output power and chirp, to achieve mode-hop-free frequency chirping with a target chirp amplitude. The waveforms may be predistorted to improve chirp linearity.

According to an aspect there is provided an apparatus for Raman light detection, said apparatus comprising: an illumination unit, configured to provide a wavelength modulation for generating and outputting wavelength modulated laser light towards a sample for inducing generation of Raman scattered light from the sample; a wavelength filter for filtering the Raman scattered light; and a light detector, configured to receive the Raman scattered light filtered by the wavelength filter and to provide an instantaneous response signal dependent on an intensity of the received Raman scattered light.

[Problem] To suppress deterioration in optical performance corresponding to the insertion / removal and type of a wavelength filter. [Solution] An optical device (200) is provided with: a processing means (203, 208) that performs processing pertaining to imaging when a wavelength filter (201) that controls the wavelength of imaging light incident on an image sensor (202) can be inserted or removed, said wavelength filter (201) being configured so that the wavelength of the imaging light incident on the image sensor (202) is smaller than the wavelength of the imaging light incident on the image sensor (202) and the wavelength of the imaging light incident on the image sensor (202) is smaller than the wavelength of the imaging light incident on the image sensor (202); the image sensor (202) is configured to capture a subject image formed by the optical system (101). And an acquisition section (208) configured to acquire optical information on the optical system for the processing, the optical information corresponding to a wavelength of imaging light corresponding to at least one of insertion / removal and type of the wavelength filter.

A frequency-chirped integrated silicon-photonic laser may be provided with separate gain and phase-tuning sections in the laser cavity, one or two wavelength filters forming part of the reflective structures defining the cavity, and electro-optic and optionally thermo-optic intra-cavity and filter phase tuners. The electro-optic phase tuners may be driven with synchronized voltage waveforms, at amplitudes determined, based on measurements of the laser output power and chirp, to achieve mode-hop-free frequency chirping with a target chirp amplitude. The waveforms may be predistorted to improve chirp linearity.

The application provides a laser three-dimensional imaging system and method based on receiving and transmitting dual-polarization modulation matching, which comprises the following steps: under the synchronous control of a transmitting unit controller, a single-wavelength linearly polarized pulsed laser is emitted by a pulsed laser, the linearly polarized direction of the laser is continuously rotated during the pulse duration, and finally the polarized modulated laser pulse is emitted to a target via a laser beam expander; in a receiving unit, the laser pulse returned from the target is received by a telescopic optical system, the beam width is narrowed, wavelength selection is performed by a wavelength filter, then the laser pulse is further decomposed into two orthogonal polarization directions by a polarization beam splitter via a receiving unit polarization modulator, and is imaged and received by two groups of imaging objectives and a surface array detector X and a surface array detector Y respectively; finally, the digital signals obtained by the two detectors are processed by a digital signal processor to obtain the distance information of each point on the two-dimensional image plane. The application realizes three-dimensional imaging at a farther distance, higher resolution and faster speed.

In examples, a sensor package comprises a die pad and a semiconductor die on the die pad. The semiconductor die has an active surface. The sensor package includes a light sensor on the active surface of the semiconductor die. The sensor package includes a mold compound covering the die pad, the semiconductor die, and a portion of the active surface. The sensor package includes a light filter covering the light sensor and abutting the mold compound. The light filter includes a combination of silicone, metal particles, and an organic dye. The combination is configured to reject light having a wavelength in a target wavelength range. The light filter has a thickness of at least 0.5 millimeters.

The invention discloses a simultaneous reflective muller matrix imaging system and method based on a color polarization focal plane camera. The system comprises a light source modulation unit, the color polarization focal plane camera and a data processing unit. The light source modulation unit is provided with three independent polarization ends, integrates a collimation system and a polaroid, and generates incident light in the linear polarization states of 0 degree, 45 degrees and 90 degrees, and the wavelength of the light source can rotate independently. The color polarization focal plane camera serves as a polarization detection end, and polarized light intensity information of multiple wavelength dimensions is synchronously collected through a Bayer wavelength filtering channel. The data processing unit can directly calculate a 3 * 3 muller matrix on the basis of a single light intensity graph by adopting a single imaging mode on a wavelength-polarization attribute irrelevant substance according to the attribute of a measured substance; a three-time imaging mode is adopted for wavelength-polarization attribute related substances, and a three-wavelength 3 * 3 muller matrix is calculated through rotation polarization end wavelength combination shooting. According to the invention, the accurate muller matrix of the measured object can be obtained in real time, and high spatial resolution is maintained in wide-field imaging.

This invention discloses a long-wavelength filter support assembly and its implementation method for cryogenic packaging. The long-wavelength filter support assembly for cryogenic packaging of this invention consists of a filter, a filter holder, and a light-blocking ring with anti-stray light. The filter has a reserved uncoated area, and the filter holder is made of molybdenum, which is compatible with germanium at low temperatures. A specific structure is set in the filter holder, and then the filter substrate is bonded to the filter holder to prevent adhesive contamination of the film and reduce stress on the film. In addition, a light-blocking ring is set on the lower surface of the filter facing the detector, so that the filter installation forms a "drawer" structure to prevent stray light from the filter edges and the uncoated areas on the top and bottom surfaces from affecting the detector. This invention is applicable to cryogenic packaging of long-wavelength filters integrated with mercury cadmium telluride, quantum wells, and type-2 superlattices, and is also applicable to other cryogenic cold platform integrated long-wavelength filters.

The application discloses a flame multispectral imaging measurement device, system and method based on an optical fiber image transmission beam, relates to the technical field of radiation imaging measurement, and solves the technical problem that different wavelength images cannot be acquired at the same time.The technical scheme is characterized in that different wavelength filter plates are arranged in front of an objective lens of the optical fiber image transmission beam.Compared with the existing radiation imaging technology, the amount of information acquired in the spectral dimension is increased, so that the accuracy of the to-be-measured field reconstruction is improved.In addition, in order to solve the problem that the traditional multispectral measurement scheme cannot guarantee that the acquired images are consistent in time, the optical fiber image transmission beam system is used for simultaneous acquisition of multispectral images, so that the time resolution and the spatial resolution of the measurement are increased, and the application value of the measurement of the temperature and the soot concentration of the flame at the tail nozzle of an aerospace engine or other jet flames is important.

The present invention is an electrode and method to eliminate electroencephalography (EEG) signal contamination using an additional filtered / neutral common reference electrode. The present invention includes an additional filtered reference electrode for filtering noise contamination from EEG recordings and a method of using the same to improve EEG signals sent, received, and recorded for patient treatment. More particularly, the invention is an apparatus / device for filtering EEG signal contamination using an additional filtered reference electrode with a bandwidth and / or signal wavelength filter incorporated therein. An advantage of the present invention is that it is an apparatus for filtering noise contamination from EEG recordings by using an additional filtered reference electrode with a filter whose limits are set by the signal received which is thus used to improve the quality of EEG recordings and the results read therefore.

Provided is a more accurate biological information measurement device.　According to the present invention, a biological information measurement device that measures biological information comprises a light projection unit that emits light, a light projection light guide unit that projects the light emitted by the light projection unit onto a living body, a light reception light guide unit that receives light that has been scattered inside the living body, a filter unit that has wavelength filters that are struck by light emitted from the light reception light guide unit, and a light detection unit that detects light that has been transmitted by the wavelength filters. The filter unit has a first wavelength filter that transmits light within a first wavelength range but reflects light within a second wavelength range and a second wavelength filter that transmits light within the second wavelength range but reflects light within the first wavelength range, and the light detection unit has a first light reception element that receives light transmitted by the first wavelength filter and a second light reception element that receives light transmitted by the second wavelength filter.

The present invention provides an optical receiving device and an optical receiving module having a tunable wavelength filter. [Solution] The optical receiving device includes a thermoelectric element 320 arranged on a substrate 310, a first tunable wavelength filter 330 with one end positioned on one side of the thermoelectric element and the other end positioned lower and inclined than the plane of the thermoelectric element, which transmits only a first wavelength that varies according to the temperature of the thermoelectric element, a second tunable wavelength filter 350 positioned above the first tunable wavelength filter and spaced apart on one side of the thermoelectric element, which transmits only a second wavelength that varies according to the temperature of the thermoelectric element, a first detector 360 positioned on the substrate at a distance from the thermoelectric element and on the optical axis of the received signal, which detects signals that pass through both the first tunable wavelength filter and the second tunable wavelength filter, and a second detector 370 positioned at a distance from the first detector on the substrate and which detects signals that have passed through the second tunable wavelength filter and are reflected by the first tunable wavelength filter.

Provided is an ophthalmological lens configured to provide a near-sightedness progression suppression effect using a monochromatic aberration of a pencil that is a bundle of rays passing through the ophthalmological lens and passing through a pupil, the ophthalmological lens including a wavelength filter for attenuating light of a long wavelength longer than a set dominant wavelength, and technology related thereto.

The invention belongs to the technical field of optical filter type spectrometers, and relates to an optical filter scanning type spectrometer light splitting system transposition error compensation method, which comprises the steps of optimal zero beat sequence measurement, filter disc zero position searching, transposition signal acquisition and comparison, and optimal zero beat sequence obtaining. Compensating transposition errors, controlling the motor to drive the filter disc to rotate in the scanning direction, searching the zero position of the filter disc, obtaining the current zero position beat sequence, calculating the zero position dislocation step value of the scanning, compensating the transposition step number of the wavelength position, and executing wavelength positioning or measurement scanning. According to the method, the influence of transposition errors can be eliminated; zero judgment and transposition signal acquisition and comparison are carried out before an instrument works, so that the optimal zero beat sequence of the stepping motor is obtained; during working, the zero dislocation step value of current scanning is calculated, and the rotation step number of transposition of each wavelength optical filter is compensated to ensure that all wavelength optical filters are accurately positioned on an optical path; according to the method, transposition errors caused by zero dislocation of the light splitting system are eliminated, and the accuracy of spectral measurement data is improved.

This wavelength filter comprises: an input waveguide into which input light is input; a first ring resonator having a first coupler and a second coupler; an intermediate waveguide connected to the second coupler; a second ring resonator having a third coupler and a fourth coupler; and an output waveguide connected to the fourth coupler. The first ring resonator and the second ring resonator are configured to have a specific wavelength region, which is a wavelength region in which, as the wavelength increases, the transmittance and the half-value width of a transmission peak of the first ring resonator exhibit wavelength dependence in which the transmittance and the half-value width monotonically increase or decrease, while the transmittance and the half-value width of a transmission peak of the second ring resonator exhibit wavelength dependence in which the transmittance and the half-value width monotonically change in a direction opposite to that of the first ring resonator.

An object of the present invention is to provide an optical communication system, an optical node, and an optical power feeding method capable of avoiding a loss of stored energy of each optical node.In an optical communication system 301 according to the present invention, a plurality of optical nodes (1-1, 1-2, 1-3, . . . ) is connected in series by optical fibers 2 in a downstream direction from an upstream controller 13, and the controller 13 performs optical power feed to each of the optical nodes (1-1, 1-2, 1-3, . . . ). The controller 13 inputs, to the optical fiber 2-0, wavelength multiplexed light beam obtained by multiplexing light beams of different wavelengths for each optical node 1. The optical node 1 includes an optical branching unit (wavelength filter 23) that branches and extracts a light beam having a wavelength allocated to the optical node from a wavelength multiplexed light beam from the upstream side, and outputs the wavelength multiplexed light beams including other wavelengths to the downstream side, and a photoelectric conversion unit (photoelectric conversion element 24 or 30) that charges a storage battery (26 or 27) with the light beam of the wavelength branched by the optical branching unit.

The invention relates to the technical field of experimental equipment, in particular to a wheat seedling stage disease resistance induction incubator integrating temperature, humidity and light regulation and control. Multi-factor precise coordinated regulation and control of temperature, humidity and light can be achieved, three regulation and control assemblies are linked through a control center, the temperature regulation and control assembly is matched with multiple sensors to guarantee uniform and precise temperature control, the humidity regulation and control assembly can precisely regulate the humidity in the box, and the light regulation and control assembly is provided with a multi-wavelength optical filter and can be rapidly replaced according to needs to meet different disease resistance induction requirements; the rotatable cultivation chamber is combined with a staggered cultivation box design, and is matched with constant-speed rotation of a turntable, so that the uniformity of a cultivation environment is greatly improved, the growth difference of seedlings is avoided, and the accuracy and repeatability of a disease resistance induction effect are guaranteed; the equipment is reasonable in structural design, the cultivation box and the optical filter are convenient to take, place and replace, a control center display screen can visually monitor and adjust parameters, and the operation difficulty is low; multiple sensors accurately monitor environmental parameters in real time, and data is wirelessly transmitted to a control center to realize automatic regulation and control, so that human intervention is reduced.

A receiver that includes a ball lens, an annular track disposed surrounding a lower portion of the ball lens, and a movable light receiver including a light receiver movably installed in a direction perpendicular to the annular track. The light receiver includes a communication light receiving element, direction detection light receiving elements disposed annularly with the communication light receiving element, a wavelength filter disposed between the communication light receiving element and a ball lens, and between the plurality of direction detection light receiving elements and a ball lens and passes light in a wavelength band of a spatial optical signal to be communicated, and an optical waveguide that is disposed in association with direction detection light receiving elements and guides the optical signal condensed by the ball lens to the direction detection light receiving element.

The invention belongs to the field of photothermoelectric film surface treatment, and particularly relates to a method for enhancing the photothermoelectric response performance of a SnSe film through a laser-induced periodic surface structure. The method comprises the following steps: (1) preparing a flexible polycrystalline SnSe photo-thermoelectric thin film; (2) setting proper laser wavelength, pulse energy and frequency division; (3) setting an interaction mode of the SnSe photo-thermoelectric thin film and laser; and (4) optimizing the position and movement mode of the displacement table relative to the laser. The method is simple in process and multiple in adjustable and controllable parameters, the response performance (such as response voltage, voltage response rate and detection rate) of the thin film to light can be further enhanced through the generated periodic structure, the response to anisotropy of light is increased, and wavelength filtering is expected to be achieved.

The invention relates to an optical filter system (100) for wavelength filtering, in particular for suppressing the hydroxyl (OH) line in received light waves (105), comprising an optical fiber (110) and a fiber holder (120). The optical fiber has a fiber core (114) extending in the direction (112) of the optical fiber with a refractive index n K on, in which a fiber Bragg grating (115) consisting of grating layers (117) repeating in the direction of extension with a refractive index n GThe fiber holder is arranged and configured to pretension the optical fiber with an adjustable holding tension, wherein the fiber holder has at least one cutout window (125) which can be opened for a marking process to inscribe the fiber Bragg grating and closed for wavelength filtering by a cover device (127) of the fiber holder, and wherein the optical fiber is fixed in the fiber holder such that at both ends (118, 118') of the optical fiber a respective free fiber end (119, 119') is provided outside the fiber holder in such a way that the respective free fiber end can be connected to a respective other external optical fiber (130, 130').