159 results about "Broadband light source" patented technology

The present invention relates to the technical field of optical fiber sensing. Disclosed are a multi-core grating sensor and a manufacturing method therefor, and a permafrost monitoring method. The multi-core grating sensor comprises a multi-core optical fiber grating, a strain gauge structure, and a demodulator, and the multi-core optical fiber grating comprises four uniformly and symmetrically distributed single-mode optical fibers, a cladding layer wrapping the four single-mode optical fibers, and a coating layer located between the single-mode optical fibers and the cladding layer; the strain gauge structure is attached to the outside of the multi-core optical fiber grating by means of glue bonding; and the demodulator is used for monitoring the dynamic change of the wavelength of the multi-core optical fiber grating, the demodulator comprises a broadband light source and a spectrum analyzer, an incident end of the multi-core optical fiber grating is connected to the broadband light source by means of the single-mode optical fibers, and an exit end thereof is connected to the spectrum analyzer by means of the single-mode optical fibers. Also disclosed in the present invention is a permafrost monitoring method. By means of comprehensive analysis and demodulation of fiber core wavelength variation amounts of a plurality of single-mode optical fibers on a single multi-core optical fiber grating, simultaneous measurement of multiple parameters is achieved, and the permafrost monitoring accuracy is improved.

A method and a system have been developed to calibrate the total spectral radiance factor (TSRF) obtained from different instruments. A broad-band light source covering the whole visible range as well as the fluorescence excitation wavelengths is used to measure the TSRF, and one or more narrow-band light sources outside of the fluorescent band is used to measure fluorescent spectral radiance factor (FSRF) separately. After that, the TSRF is adjusted by the FSRF, and a calibrated TSRF can be obtained. This can be applied to characterize Optical Brightening Agents (OBAs) as well as other fluorescent materials without requiring any moving part of the instrument to do the calibration.

The invention discloses a multi-area real-time end point detection system and method for cleaning a semiconductor chamber, and relates to the field of semiconductor gas detection, a gas path unit is provided with a main gas inlet, a first branch, a second branch and a valve module used for connecting or disconnecting the first branch or the second branch; a first broadband light source and a first multi-channel photoelectric detector are oppositely arranged on the two sides of the first cavity, and optical filters with different central wavelengths are arranged in multiple channels of the first multi-channel photoelectric detector respectively; a plurality of second photoelectric detectors, a plurality of target light sources and a displacement platform are oppositely arranged on the two sides of the second cavity, and the target light sources are installed on the displacement platform and can move relative to the second photoelectric detectors; and the control module is in signal connection with the valve module, the first multi-channel photoelectric detector, the displacement platform and each target light source. By adopting the scheme, the detection efficiency is considered while the detection precision is ensured, and more reliable real-time end point judgment can be realized in a complex gas flow field environment.

The invention discloses a temperature and hydrogen concentration dual-parameter synchronous detection system and method, and the system comprises an ASE broadband light source, the output of the ASE broadband light source is divided into two paths through a coupler, one path enters a first circulator, the other path enters a second circulator, the output of the first circulator enters a first FBG sensor, the output of the second circulator enters a second FBG sensor, and the output of the first FBG sensor enters a second FBG sensor. The two FBG sensors are arranged in the gas chamber, the first FBG sensor and the second FBG sensor are provided with FBG topological optical fiber structures with different working wavelengths and have temperature sensitivity and gas selective response, and reflected signals of the two FBG sensors are coupled to one path through the dual-channel wavelength division multiplexer and are sent to the spectrum analyzer for wavelength demodulation. The temperature sensitivity and the gas selective response are integrated in the same sensing unit by utilizing the wavelength coding characteristic of the fiber bragg grating, so that precise decoupling and real-time output of double parameters are realized, and the detection efficiency and the data consistency are improved.

An LSP broadband light source is disclosed. The light source may include a gas containment structure. The light source may include a plurality of jet nozzles, wherein the jet nozzles are configured to generate a supersonic gas jet and direct the supersonic gas jet to collide within the gas containment structure to form a localized high pressure region at a point of collision. The light source may include a primary laser pump source, wherein the primary laser pump source is configured to direct a primary pump beam to a localized high pressure region formed at the point of impact. The light source may include a pulsed assist laser source, wherein the pulsed assist laser source is configured to direct a pulsed assist beam to the localized high voltage region at the point of impact. The light source may include a light collector element configured to collect broadband light emitted from a plasma.

This invention discloses a multi-channel programmable miniaturized high-speed FBG demodulation system and method based on an AWG (Optical Fiber Optic Generator), belonging to the field of fiber optic sensing technology. The AWG-based multi-channel programmable miniaturized high-speed FBG demodulation system includes a high-stability broadband light source module, a low-loss isolation module, a miniaturized programmable fiber optic amplifier, a circulator, a two-stage miniaturized high-speed optical switch, a high-crosstalk AWG module, a photoelectric conversion module, a programmable A / D conversion module, and a core control module. The AWG-based multi-channel programmable miniaturized high-speed FBG demodulation method involves the optical signal entering an FBG sensor array, the FBG sensor reflecting the optical signal, the reflected optical signal entering the AWG module, and the output light undergoing photoelectric conversion to calculate the center wavelength of the FBG sensor. This invention, based on an AWG, improves demodulation accuracy while ensuring the demodulation range, achieving continuous wavelength demodulation within the AWG wavelength range.

A calibration light source includes: a broad band light source emitting light in a broad spectral range; and a filter receiving light emitted by the broad band light source and providing structured light by imposing an attenuation pattern exhibiting pattern features at multiple spectral reference lines on the received light such that an emission spectrum of the structured light emitted by the calibration light source exhibits distinct, identifiable emission spectrum features corresponding to the pattern features at the multiple spectral reference lines. A method of calibrating at least one spectrometer using the calibration light source is further disclosed.

A system may include a broadband light source emitting polarized light that is polarized to two orthogonal polarization states, multiple beam splitters for combining and splitting the polarization states, and interferometric cell for creation of interference patterns with respect to a sample surface, lenses of appropriate design that focus the polarized light at predefined locations, and sensors that analyze the polarized light as a function of angle and wavelength. The system may also include a controller configured to modulate the reference arm through operation of an optical chopper and allow for different data analysis modes to be used on the system produced data.

The invention discloses a method for measuring a residual birefringence difference value of a transparent ferroelectric electro-optical material based on a Fabry-Perot resonant cavity. The method comprises the following steps: constructing a Fabry-Perot resonant cavity measuring light path consisting of a broadband light source, a polarization control assembly and a sample to be measured; the polarization state of incident light is accurately controlled through a magnetic control Faraday rotating mirror, and transmission spectrums in the o-light direction and the e-light direction are obtained respectively; a high-precision spectrum acquisition module is adopted to record transmission spectrum characteristics; based on an original spectrum processing algorithm, the residual birefringence difference value of the to-be-detected material is calculated by analyzing the resonant wavelength offset and the free spectrum range change of the o-light and e-light transmission spectrums. The method solves the problem that the weak birefringence detection capability of the existing measurement technology is insufficient, has the advantages of high measurement precision, strong anti-interference capability and the like, and is suitable for performance evaluation, process optimization and device performance improvement of the transparent ferroelectric electro-optical material.

There is described a system and method for measuring properties of water, such as surface water at site. That site may be in an agricultural setting. The properties of water, such as surface water may include nitrates and / or dissolved organic carbons. An example system may comprise a light source configured to emit a broadband source signal comprising a particular bandwidth for use in measuring a range of particular properties of water as well as an optical device configure to split the source signal into a measurement signal, and a corresponding reference signal. The system may also comprise a sensor unit configured to communicate a measurement signal through water at the sensor unit (e.g., when located in a stream), and a spectrometer configured to receive both a measurement signal having been communicated through water at the sensor unit and a reference signal from the optical device. Such a spectrometer may be configured to separate received measurement signals and reference signals into common component wavelengths, those common component wavelengths being associated with expected properties of water; and the system may be further configured to use respective component wavelengths of a measurement signal together with those of a reference signal to determine one or more particular properties of measured water.

The application relates to the technical field of micro-nano optics and high-precision thin film thickness measurement, and discloses a resolution-optimized thin film thickness measurement method and system based on a metasurface, to solve the problem that the existing thin film thickness measurement method cannot realize non-contact and high resolution. The system comprises a broadband light source, a composite metasurface measurement probe, a spectrometer and a data processing unit. The composite metasurface measurement probe comprises a composite metasurface, the composite metasurface comprises a multilayer step flat lens and a single-layer metasurface, the single-layer metasurface is composed of a transparent glass substrate and a micro-nano structure array constructed above the transparent glass substrate, and the flat lens is connected with the transparent glass substrate of the single-layer metasurface. The composite metasurface is used for receiving and phase-controlling incident light of different wavelengths. The spectrometer is used for recording the light intensity distribution of reflected light changing with wavelengths, and obtaining a reflected spectrum signal. The data processing unit is used for calculating the thin film thickness according to the reflected spectrum signal. The system can improve the precision of thin film thickness measurement.

The application provides a visible light band optical fiber SPR liquid refractive index linear measurement device and method, the device comprises a broadband light source, a first lens and a second lens, a polarizer, a third lens and a fourth lens, a pinhole, a fifth lens, an optical fiber SPR, a sixth lens, a diffraction grating, a concave mirror, a linear array CCD and a data processing unit; the data processing unit is used for extracting the resonance wavelength corresponding to the normalized light intensity minimum value from the wavelength-intensity spectrum curve, and calculating the refractive index of the liquid medium to be measured according to the linear relationship between the refractive index and the resonance wavelength which is calibrated in advance. The device is not only intuitive in optical path debugging and easy to operate, but also has a rigorous theoretical model and high measurement precision, and is very suitable for rapid and accurate refractive index screening and analysis of a large number of low-concentration liquid samples, and has wide application prospect and industrial value.

The application discloses a kind of induction logging instrument systems and acquisition method based on plasma optical fiber sensor, including ground current emission source and at least one well in current emission source and well in receiving acquisition device, the well in receiving acquisition device is connected with the optical system of induction signal detection being arranged on ground, the optical system is composed of sequentially connected broadband light source, polarizer, polarization controller, fiber optic circulator and spectrum analyzer, the fiber optic circulator is connected with well in receiving acquisition device and spectrum analyzer respectively, at least two plasma resonance optical fiber sensing probes are arranged in the well in receiving acquisition device. There is no mutual interference or crosstalk between plasma resonance optical fiber sensor, optical fiber sensor and emission power supply and antenna, and it is not easy to be disturbed by environmental electromagnetic noise, and multi-channel large data high-speed real-time transmission can be realized by using armored photoelectric composite cable connected with each well in receiving acquisition device.

The application discloses a Fourier photoacoustic gas detection device and method, and belongs to the technical field of gas detection. In view of the limited anti-interference ability of a sound signal and the low detection sensitivity of an existing Fourier transform photoacoustic spectrum, a Fourier photoacoustic gas detection device is designed. A supercontinuum broadband light source is used as an excitation light source of a photoacoustic effect, the broadband light source is subjected to unified intensity modulation through an intensity modulation assembly and phase modulation through an interferometer assembly. After the broadband interference light emitted through double modulation interacts with gas molecules, wide-spectrum mixed sound waves are generated, a quartz tuning fork sound measurement assembly extracts resonance components and converts the resonance components into electrical signals. The generated electrical signals are sequentially subjected to processing through a signal amplification assembly, a phase-sensitive demodulation assembly and a Fourier transform assembly, and the processed signals are used for component discrimination and concentration inversion of a target gas.

The application discloses a kind of multi-zone real-time endpoint detection system and method for semiconductor chamber cleaning, it is related to semiconductor gas detection field, gas path unit, with total gas inlet, first branch, second branch and for the valve module of the first branch or second branch is opened or closed;First chamber, opposite first broadband light source and first multi-channel photoelectric detector are arranged on two sides, and the filter of different center wavelength is configured in multiple channels of first multi-channel photoelectric detector;Multiple second photoelectric detectors, multiple target light sources and displacement platform are oppositely arranged on two sides of second chamber, and multiple target light sources are installed on displacement platform and can be moved relative to second photoelectric detector;Control module is signal connected with valve module, first multi-channel photoelectric detector, displacement platform and each target light source.Using the above scheme, while ensuring the detection accuracy, detection efficiency is also considered, and more reliable real-time endpoint determination can be realized in complex gas flow field environment.

An OCT system includes a broadband light source, and a beam splitter that splits the broadband light into a reference beam and an illumination beam. A reference mirror reflects the reference beam. Illumination optics passes the illumination beam and has a reflective surface with an optical power. Collection optics has a transparent region and a reflective surface with an optical power. The collection optics is configured so that the illumination beam is reflected from the reflective surface of the collection optics to the reflective surface of the illumination optics such that the illumination beam is redirected to a surface of a sample at an angle that results in scattering from within the sample that forms a sample beam propagating normal to a surface of the sample and through the transparent region of collection optics and through the transparent region of the illumination optics. An interferometric combiner is configured to interferometrically combine light from the sample beam and the reference beam. A spectrometer is configured to receive the interferometrically combined light from the sample beam and the reference beam and to generate spectral interferometric information. A processor processes the spectral interferometric information to determine information about the sample.

A diaphragm-type optical fiber micro-vibration measurement apparatus and method based on a single-pass band microwave photonic filter. The apparatus comprises a broadband light source module (1), a three-port circulator (2), an AU diaphragm optical fiber micro-vibration sensor (3), an erbium-doped optical fiber amplifier (4), a polarization controller (5), an electro-optical modulator (6), a power supply module (7), a radio-frequency source module (8), a dispersion compensation optical fiber (9), a photoelectric detector (10), a data acquisition card (11) and a computer (12), wherein the broadband light source module (1) is connected to one port of the three-port circulator (2) by means of an optical fiber connection line.

A multi-mirror laser sustained plasma broadband light source is disclosed.SOLUTION: The light source may include a gas containment structure for containing a gas. The light source includes a pump source 202 configured to generate pump illumination 204 and a first reflector element 206 configured to direct a portion of the pump illumination 204 into a gas to sustain a plasma. The first reflector is configured to collect a portion of the broadband light emitted from the plasma. The light source also includes one or more additional reflector elements 214 disposed opposite the first reflector. The one or more additional reflector elements 214 are configured to reflect unabsorbed pump illumination 204 and broadband light not collected by the first reflector element 206 back to the plasma.SELECTED DRAWING: Figure 2A

The broadband light source includes a confocal sensor assembly configured to measure a surface of a rotatable drum covered with a plasma formation target material. The broadband light source includes a laser source configured to direct pulsed illumination at the rotatable drum to excite the plasma formation target material and emit broadband light as the drum is angularly rotated and axially translated. The broadband light source includes a controller configured to direct the confocal sensor assembly to transmit a confocal light signal to the rotatable drum, record a calibrated measurement of the distance from the confocal sensor assembly to the rotatable drum, direct a cryogenic cooling subsystem to cryogenically cool the rotatable drum, record one or more distance measurements from the sensor head to the rotatable drum, convert the distance measurements to temperature values, and determine whether a target process condition temperature has been achieved.

The optical interferometer comprises: a broadband light source that outputs a first light in a given frequency domain with suppressed relative intensity noise (RIN); a wavelength divider that divides the first light into a first component and a second component with a center wavelength different from the first component and outputs the second component; a first optical path that propagates the first component output from the wavelength divider; a second optical path that propagates the second component output from the wavelength divider; and a wavelength synthesizer that combines the first component propagating in the first optical path and the second component propagating in the second optical path as a second light output.

The application discloses a kind of molecular imprinting micro-nano fiber interference type plasticizer sensor, sensing method and manufacturing method, and the sensor includes broadband light source, incident optical fiber, polydopamine molecular imprinting film layer coated micro-nano fiber cascade interferometer, outgoing optical fiber and spectrum analyzer;Broadband light source is connected with the left end of incident optical fiber, the right end center of incident optical fiber is connected with the left end of micro-nano fiber cascade interferometer, the right end of micro-nano fiber cascade interferometer is connected with the left end of outgoing optical fiber, and the right end of outgoing optical fiber is connected with spectrum analyzer;Micro-nano fiber cascade interferometer is used as the sensing probe for measuring plasticizer concentration.The plasticizer sensor of the application is simple to manufacture, compact structure, has greater advantage in sensitivity in the field of biochemical sensing, and different sensitivity refractive index sensors can be obtained by controlling the diameter of multi-core optical fiber.

The invention provides a substrate deformation measurement system based on a fiber bragg grating (FBG) and a self-adaptive layout method thereof. The substrate deformation measurement system comprises an FBG sensor network, a data acquisition module, a signal preprocessing and data analysis processing module and a visual interface, the FBG sensor network comprises a measured substrate and a fiber grating string; the data acquisition module comprises a tunable broadband light source, an optical isolator, an optical circulator, a signal transmission optical fiber, a spectrum analyzer and a corresponding demodulation algorithm; the signal preprocessing and data analysis processing module comprises hardware equipment and computer software; and the visual interface uses Labview to write a front-end interface, and is used for performing three-dimensional real-time display on a substrate shape reconstruction result and realizing an alarm function for special situations. According to the invention, through fusion of real-time data and a prior model, focusing monitoring and resource optimization configuration of a key area are realized, and the problems of high calculation complexity, low data processing efficiency and the like in a traditional distributed fiber grating morphology sensing technology are solved.

The application provides a kind of sub-aperture mosaic spectral calibration detection device and its detection method, wherein the detection device includes: broadband light source, wavelength division multiplexing device, coupler, integrating sphere and spectrometer;Detection device is used to detect large aperture telescope system, and telescope system includes primary mirror and secondary mirror;Broadband light source is used to emit broadband light beam to wavelength division multiplexing device, and wavelength division multiplexing device is used to select the frequency band of broadband light beam, and the incident light beam is transmitted to the pupil of telescope system through coupler, and is incident to focal plane after being reflected twice in primary mirror and secondary mirror of telescope system, and integrating sphere is arranged at the focal plane of telescope system, and the outgoing light beam is transmitted to spectrometer by multimode optical fiber to obtain the actual measured spectral data T (i). The application selects spectrum by wavelength division multiplexing device, and the response generated by different spectrum, finally realizes the splicing detection of system through the cooperation of three domains of space domain, time domain and frequency domain.

The invention discloses an optical fiber-based IgG protein concentration detection method. A used device comprises a broadband light source, a single-mode optical fiber, a polarization controller, a flow cell, a TFBG-SPR sensor and a spectrum analyzer. Firstly, light with the wavelength range of 1420-1620 nm is emitted by a broadband light source, the polarization state of the light is adjusted to a P state through a polarization controller, then the light is input into an AuNPs / 11-MAA / rabbit anti-human IgG modified sensing probe, and finally a spectrum is displayed on a spectrum analyzer. Rabbit anti-human IgG on the surface of the TFBG can be combined with human IgG to cause change of the refractive index, drifting of a transmission spectrum is shown on a spectrum analyzer, and rapid, accurate and trace detection of the IgG concentration is realized by comparing the relationship between the concentrations of different IgG solutions and the drifting of the transmission spectrum. The invention provides a novel method which is simple in structure, high in accuracy and quick in response for measuring the concentration of IgG, and has great application potential.

The invention provides an exosome quantitative detection method based on TFBG-SPR (Total Fiber Bragg Grating-Surface Plasmon Resonance). The detection device is composed of a broadband light source, a single mode fiber, a polarization controller, a TFBG-SPR exosome sensor, a detection sample pool and a spectrum analyzer. The detection principle can be summarized as follows: light emitted by the broadband light source is transmitted to the polarization controller through the single-mode optical fiber, incident light is modulated to be in a P polarization state at the position of the polarization controller, P-state light is transmitted to the TFBG-SPR exosome sensor, the sensor is fixed in the detection sample pool, and finally an output light signal is presented on the spectrum analyzer in a transmission spectrum mode. In the detection process, an exosome is selectively captured by a CD63 antibody layer on the surface of the TFBG-SPR exosome sensor, so that the refractive index of the surface of the TFBG-SPR exosome sensor is changed, and an output transmission spectrum drifts. By comparing the relationship between the concentrations of different exosome solutions and the transmission spectrum drift amount, the portable, rapid and high-sensitivity quantitative detection of the exosome is realized. And meanwhile, directional measurement of different types of exosomes can be realized by changing the types of detection antibodies on the surface of the sensor. The invention provides a novel method which is high in sensitivity, simple to operate and rapid for quantitative detection of the exosome, and has wide application value in the aspects of cancer prediction, diagnosis and prognosis and other biomedical detection.

A system and method are provided for spectral shaping of light from a broadband source including multiple wavelengths. The system includes a beam splitter (BS) to receive and transmit an input beam, a dispersive element to disperse the input beam into dispersed beams separated by wavelength, and optic-elements to direct the dispersed beams onto a spatial light modulator (SLM). The SLM selectively modulates the dispersed beams reflected from the SLM, and the optic elements transmit a 0th-order of the reflected light through the dispersive element, which recombines the beams to form a reflected beam directed toward the BS. The BS separates the reflected beam from the input beam and directs it to an optical output of the system. The SLM includes multiple electrostatically deflectable reflective ribbons suspended over a reflective surface of a substrate, wherein the ribbons are separated by a distance equal to a width of the ribbons.

The invention discloses a trace lead ion concentration detection method based on a TFBG-SPR integrated MXene film. A used device comprises a broadband light source, a single-mode fiber, a polarization controller, a flow cell, a TFBG-SPR sensor and a spectrum analyzer. Firstly, a broadband light source emits light with the wavelength range of 1420-1620 nm, the polarization state of the light is adjusted to a P state through a polarization controller, an MXene functional film is deposited on the surface of a TFBG-SPR sensor and used for being combined with lead ions in a solution to be detected, and finally a spectrum is formed on a spectrum analyzer; the MXene functional film on the surface of the TFBG can be combined with the lead ions to cause the change of the refractive index, the change shows the drifting of the transmission spectrum on a spectrum analyzer, and the rapid, accurate and trace detection of the concentration of the lead ions in the water environment is realized by comparing the relationship between the concentrations of different lead ion solutions and the drifting of the transmission spectrum. The invention provides a novel method which is simple in structure, high in accuracy and quick in response for measuring the concentration of the lead ions, and has great application potential.

An ellipsometer is provided that uses a broadband light source and a Fresnel cone to produce a simultaneous broadband polarization state generator without moving parts. The detector of the ellipsometer includes a diffractive element to spatially separate the wavelengths of light from the sample. The wavelengths can be sufficiently separated in space so that there is no overlap of wavelength bands when imaged by a two-dimensional sensor, or can be separated in time. In addition, the detector separates and simultaneously analyzes the polarization state of the light from the sample so that there is no overlap of polarization states when imaged by a two-dimensional sensor, and no moving parts are used. The resulting image with separated wavelengths and polarization states can be used to determine at least part of the Mueller matrix of the sample.

Multilayer articles are provided, including an absorbent layer and an ultraviolet mirror containing at least a plurality of alternating first and second optical layers. The absorbent layer absorbs ultraviolet light having a wavelength between at least 230 nanometers (nm) and 400 nm. The ultraviolet mirror reflects ultraviolet light in a wavelength range from 190 nm to 240 nm. Systems are also provided including a broadband UVC light source and a multilayer article. Devices are provided including a chamber, a broadband UVC light source located within the chamber, an absorbent layer in the chamber, and an ultraviolet mirror between the light source and absorbent layer. Methods of disinfecting a material are further provided, including obtaining a system or device, directing UVC light at the ultraviolet mirror, and exposing the material to ultraviolet light in a wavelength range from 190 nm to 240 nm, reflected by the ultraviolet mirror towards the material.

A non-invasive device for detecting Alzheimer's Disease-associated pathologies, comprising a fundus camera comprising a spectral reflectance imaging unit that includes a broadband light source and a light sensor and a lens assembly to focus light from the broadband light source onto a fundus of an eye, and one or more processors to detect reflected and / or backscattered light from the eye, illuminated by the broadband light source, using the light sensor for determining spectral reflectance information, generate a plurality of spectral reflectance maps comprising counts of reflected and / or backscattered light at a different wavelength or a different range of wavelengths, assign a weight to each of the spectral reflectance maps, and determine one or more regions of interest from the weighted spectral reflectance maps as being a potential Alzheimer's Disease-associated pathology based on a detection of one or more biomarkers indicative of Tauopathy.