21 results about "Wavelength filter" patented technology

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.

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.

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.

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.

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.

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').

This invention discloses a portable fluorescence detection device, belonging to the field of fluorescence detection technology, suitable for rapid on-site detection of samples such as Helicobacter pylori. The device includes a 480 nm wavelength excitation LED light source, a plano-convex lens, a 480 nm wavelength filter, a 520 nm wavelength filter, a mounting base, a photodetector, a control circuit, and supporting software. The mounting base and internal optical path are made of black matte material to suppress stray light interference. The plano-convex lens and filter are fixed to the corresponding optical axis. The 480 nm wavelength excitation light, after collimation and filtering, is incident on the sample at a 45° angle, and the fluorescence is received by the detector after filtering. The control circuit integrates WIFI / Bluetooth and a serial port, which can acquire network time as a data tag and adjust the excitation light power. The software constructs a neural network detection model based on the sample dataset to achieve qualitative and quantitative detection. This device is compact and portable, with replaceable slides, and provides accurate and efficient detection, suitable for clinical and on-site screening.

The application provides a multi-channel erbium-doped optical fiber ultrasonic detection system and relates to the field of erbium-doped optical fiber ultrasonic detection, and comprises an optical amplifier, a polarizer, a first wavelength division multiplexer, n polarization controllers, n circulators, n F-P ultrasonic sensors, a second wavelength division multiplexer, a coupling unit and a data processing unit. The polarizer, the first wavelength division multiplexer, the polarization controller, the circulator and the F-P ultrasonic sensor are added in the ring erbium-doped optical fiber laser, the polarization hole burning effect is utilized, and the n F-P ultrasonic sensors respectively excite corresponding laser wavelengths. The F-P ultrasonic sensor is used as a multi-wavelength filter, the polarization hole burning effect is utilized to realize the vibration of multiple wavelengths, each wavelength can be used as a channel to perform ultrasonic sensing, the cross talk between the n channels can be eliminated, and the multi-wavelength laser vibration is realized, and the response characteristics of the F-P are utilized to realize the multi-channel ultrasonic detection.

An optical communication device processes a WDM signal in a WDM transmission system that uses a first wavelength band and a second wavelength band. A wavelength filter extracts a first WDM signal allocated in the first wavelength band and a second WDM signal allocated in the second wavelength band from a WDM signal received from first node. An optical signal branched from the first WDM signal is guided to an access network and a remaining optical signal that is not branched from the first WDM signal is guided to second node. An optical signal branched from the second WDM signal is guided to the access network via a wavelength converter and a remaining optical signal that is not branched from the second WDM signal is guided to the second node. The wavelength converter converts wavelengths from the second wavelength band to a third wave length band.

The optical loss of the output light of the first light source transmitted through the optical multiplexer is suppressed. An optical transmitter includes: a first light source; one or more second light sources having mutually different wavelengths and each having a wavelength different from that of the first light source; an optical multiplexer that transmits output light from the first light source from a first end surface to a second end surface facing the first end surface, causes the output light to reflect on a reflecting mirror formed on the second end surface, transmits output light from the second light source through a wavelength filter formed on the first end surface, causes the output light to reflect on the reflecting mirror, and multiplexes the output light; and a first monitor PD for monitoring optical power with a part of the output light from the first light source.

An exemplary optical spectrum control device according to the present disclosure comprises: an optical spectrally tunable circuit that tunes the optical spectrum of input light; an optical switch that selectively outputs the input light or output light of the optical spectrally tunable circuit; an optical monitor that monitors the light selected by the optical switch; and a control circuit that controls the optical spectrally tunable circuit on the basis of a measurement result of the optical monitor. The optical monitor includes: a wavelength filter that selectively outputs the light selected by the optical switch in units of wavelengths; and a light receiver that receives the light of each wavelength selected by the wavelength filter and detects the light intensity. The control circuit controls the selective outputs by the optical switch and the wavelength filter to cause the light receiver to receive light of each wavelength individually, thereby acquiring information about the wavelength distribution of light intensity.

In a wavelength filter (13) according to the present invention, a single waveguide is connected to one end surface, a plurality of waveguides are connected to the other end surface, the plurality of waveguides respectively input light having a plurality of wavelengths, and light in which the light having a plurality of wavelengths has been multiplexed is output by the single waveguide. The wavelength filter comprises a first substance (131), a second substance (132) that has a lower refractive index than the first substance, and a plurality of aggregates in which the first substance is contiguous in an irregular shape within the second substance. One portion of the aggregates among the plurality of aggregates is disposed so as to be contiguous between the single waveguide and each of the plurality of waveguides. Another portion of the aggregates among the plurality of aggregates is not contiguous with the one portion of aggregates and is disposed surrounding the one portion of aggregates. Input light is multi-scattered, undergoes interference, and is output by the plurality of aggregates.　Thus, the present invention can provide a compact wavelength filter with an excellent modulation characteristic.

A wavelength control unit performs wavelength filtering on input light guided by a first optical waveguide and outputs output light. An output light intensity monitoring unit monitors an intensity of the output light guided by a second optical waveguide. A third optical waveguide is spaced apart from and parallel to the first optical waveguide in a first direction. A fourth optical waveguide is spaced apart from and parallel to the second optical waveguide in a second direction. First and second reference light intensity monitoring units monitor intensities of first and second reference lights input to the third and fourth optical waveguides. End faces of the first and third optical waveguides belong to a first surface. End faces of the second and fourth optical waveguides belong to a second surface.

The present invention provides a wavelength filter that can suitably secure a wavelength tuning range. [Solution] The wavelength filter 10 is an input light L in The system comprises an input waveguide 20 into which the signal is input, a first ring resonator 30 having a first coupler 31 and a second coupler 32, an intermediate waveguide 60 connected to the second coupler 32, a second ring resonator 40 having a third coupler 41 and a fourth coupler 42, and an output waveguide 50 connected to the fourth coupler 42. The first ring resonator 30 and the second ring resonator 40 are configured to have a specific wavelength range in which the transmittance and full width at half maximum of the transmission peak of the first ring resonator 30 exhibit a wavelength dependence in which the transmittance and full width at half maximum of the transmission peak of the second ring resonator 40 exhibit a wavelength dependence in which the transmittance and full width at half maximum of the transmission peak change monotonically in the opposite direction to that of the first ring resonator 30.

The invention provides an illumination optical system for wafer bonding and a wafer bonding alignment system, and relates to the technical field of semiconductor processing, the illumination optical system comprises a first near-infrared light source, a second near-infrared light source, a third near-infrared light source and a fourth near-infrared light source, the light outlet of each near-infrared light source is provided with an optical filter; a light outlet of the first near-infrared light source and a light outlet of the second near-infrared light source are coupled through a two-in-one optical fiber and then connected to the lighting system, and a light outlet of the third near-infrared light source and a light outlet of the fourth near-infrared light source are coupled through a two-in-one optical fiber and then connected to the lighting system. And four beams of monochromatic light with set wavelengths, which are obtained after being filtered by the optical filter, are connected into an illumination system, and two pairs of parallel light beams with corresponding angles are generated and are incident into an entrance pupil of the large-view-field near-infrared dispersion microscope objective. According to the invention, the light spots can be formed only in the shooting area, the energy utilization rate of the light source is greatly improved, and the illumination requirement of high-precision bonding of the chip and the wafer is ensured.

The invention relates to the technical field of optics, and provides a carrier suppression optical beam forming device and method based on an optical comb and periodic filtering, an optical frequency comb generates a composite optical signal containing M comb teeth, and the composite optical signal is divided into M paths of single-wavelength optical carriers after being subjected to wavelength filtering by an M-wavelength wavelength division demultiplexer; m electro-optical modulators modulate M paths of single-wavelength optical carriers into optical carriers for modulation, formed M paths of microwave photon signals are combined into one path of optical carrier signals with M wavelengths through an M-wavelength wavelength division multiplexer, intensity suppression is carried out through a periodic filter, power compensation is carried out through an optical amplifier, and dispersion delay is carried out through a delay unit; and the photoelectric detector converts the optical carrier signals of the M wavelengths after dispersion delay into microwave signals to form final beam output. The problem that a large amount of optical power is wasted on optical carriers in a traditional optical beam forming framework can be solved, the link gain is greatly improved, the noise coefficient of the system is reduced, and therefore the dynamic range of the system is widened.

The invention belongs to the technical field of photoelectric detection, and relates to a battery functional damage detection method and device based on semiconductor multi-junction spectral response characteristics. The detection method comprises the following steps: selecting a detection light source and a detection light filter with suitable wavelengths based on the spectral response range of each junction sub-cell in the semiconductor cell, and obtaining suitable detection light sources with different wavelengths by using a simulated solar light source and a multi-wavelength light filtering device, and exciting the multi-junction solar cell and each junction sub-cell. And detecting the performance of each junction battery in the battery. The functional damage detection of the multi-junction solar cell is realized by measuring the working characteristics of the multi-junction solar cell before and after the action of the external factors, and the scheme of the invention is simple to realize and is beneficial to engineering realization and experimental verification.

The invention discloses an AOI equipment light intensity curve generation method, system and equipment and a storage medium, and relates to the technical field of light intensity curve generation, and the method comprises the steps: selecting a randomly selected wavelength optical filter, optical attenuation sheets disposed at a first gear and a second gear, and an optical scene with the output power of an illumination light source increased at a first preset step length; determining a first reference curve and a second reference curve based on the optical power values under different illumination light source output powers; determining a target reference curve according to the first reference curve and the second reference curve; determining a peak value of a light intensity curve based on an image gray value of the reference silicon wafer, the target reference curve and a preset coefficient on the reference silicon wafer under different preset target objective lenses and corresponding target wavelength optical filters, an optical attenuation sheet arranged at a first gear or a second gear and an optical scene of the output power of the illumination light source increased by a second preset step length; and determining a target light intensity curve according to the light intensity curve vertex value and the target reference curve. According to the method, the light intensity curve with high universality can be efficiently generated.

The invention belongs to the technical field of laser, and discloses a feedback type multi-wavelength space laser shaping and amplifying structure based on a layered frequency doubling crystal, which is characterized in that a laser source unit comprises one or more lasers, and a selective frequency doubling unit comprises a 50 / 50 space optical beam splitter, a non-frequency doubling optical path, a frequency doubling optical path and a space optical coupler. The non-frequency doubling light path only passes through one optical switch, the frequency doubling light path passes through one optical switch, one layered frequency doubling crystal module and one multi-wavelength filter, and the feedback laser shaping unit comprises a three-port one-way transmission device, a multi-wavelength waveform shaping device and a total reflection mirror device. The multi-wavelength gain amplification unit comprises a gain amplifier based on a layered gain medium module and a multi-wavelength filter, and the output end of the laser source unit is in butt joint with the input end of the selective frequency doubling unit. The device is simple in structure, high in expansibility, suitable for being used in a space laser application system, and capable of modulating laser frequency, improving multi-wavelength laser waveforms and improving multi-wavelength laser output energy.

The invention provides a gas detection device capable of detecting trace gas components with a simple structure. The gas detection device is provided with at least an acoustic wave generation / detection unit (11), and the acoustic wave generation / detection unit (11) has: a first light source housing chamber (16A) having a first light source (17A) and a first optical wavelength filter (18A); a second light source housing chamber (16B) having a second light source (17B) and a second optical wavelength filter (18B); a detection chamber (19) into which light from the first light wavelength filter (18A) and light from the second light wavelength filter (18B) are incident; and a detector (20) that measures the intensity of the acoustic wave generated in the detection chamber (19), sets the second transmission band of the second optical wavelength filter (18B) to a transmission band narrower than the first transmission band of the first optical wavelength filter (18A), and sets the first transmission band of the first optical wavelength filter (18A) to a transmission band including the second transmission band.