379 results about "Broadband light source" patented technology

The invention provides a multi-layer optical film detection method, device and equipment and a storage medium, and the method comprises the steps: obtaining a polarization phase difference signal of transmission light and reflected light through multi-angle incidence irradiation of a multi-band programmable laser source, and recording the polarization ellipticity parameter change; then combining confocal microscopic interference and polarization analysis to determine a space coordinate and a stress distribution diagram of a stress abnormal region; continuously irradiating in a photo-thermal coupling environment through a broadband light source, and monitoring interference signals, polarization states and temperature changes to obtain dynamic evolution characteristics; and finally, performing a simulation test on the multi-layer optical film in a system environment with preset optical axis arrangement and light beam energy distribution, obtaining an in-situ polarization state and interference pattern data, and evaluating the optical performance of the film layer. According to the invention, potential defects can be positioned under high resolution, and the reliability and imaging quality of the film layer under complex application conditions can be accurately evaluated.

The invention provides a wavelength division multiplexing-fused multi-core optical fiber temperature detection method and system. Wherein the broadband light source is divided into multiple wavelength channels through wavelength division multiplexing, and a wavelength-fiber core mapping relation is established, so that each fiber core of the multi-core optical fiber transmits a single-wavelength optical signal. An optical fiber is integrated to the surface of an object according to a three-dimensional path, each fiber core covers a plurality of sensing sub-areas, the wavelength drift amount caused by temperature is extracted by detecting the attenuation characteristic of an optical signal at a bending position, the wavelength drift amount is converted into a temperature value in combination with a calibration curve, and a temperature gradient model bound with the fiber core position is constructed. And further performing spatial solution by using fiber core spacing, wavelength mapping and transmission time delay parameters, establishing a corresponding relationship between the coordinates of the sensing sub-regions and the temperature, and finally reconstructing three-dimensional temperature field distribution. According to the technical scheme provided by the invention, high-resolution dynamic reconstruction and gradient analysis of a three-dimensional temperature field on a complex surface are realized through wavelength-space two-dimensional decoupling.

The invention relates to the cross technical field of atmospheric science and communication technology, in particular to an atmospheric refraction and waveguide environmental parameter detection and prediction method and device, and the method comprises the following steps: carrying out the power distribution of a light beam of a broadband light source through employing a light splitting element based on the emission of the broadband light source, and forming a detection light beam and a reference light beam, and guiding the detection light beam to pass through a preset open atmosphere optical path, and guiding the reference light beam to pass through a known refractive index stabilizing medium or a vacuum pipeline. The detection light beam and the reference light beam are formed through light splitting of the broadband light source, the detection light beam penetrates through the open atmosphere path, the reference light beam passes through the stable medium, Fourier transform is carried out on interference signals of the two light beams to extract wavelength phase difference mapping data, and tiny optical path change caused by atmospheric refractive index disturbance can be captured. Compared with the traditional single-point or single-path measurement, the sensing sensitivity and the measurement dimension of the atmospheric refractive index spatial nonuniformity are improved by using the broadband spectral information.

The invention discloses a calibration device with a spectrum self-calibration function and a high-resolution spectrum calibration method thereof. The device comprises a narrow-band light source, a broadband light source, an optical fiber isolator, a coupler, an interference system, a multi-way switch, an FP (Fabry-Perot) cavity, a collimator, an orthogonal dispersion system and a computer, wherein the orthogonal dispersion system consists of a cylindrical lens, a reflector, a virtual phase array, a grating, a focusing lens and an industrial camera; according to the device, different light source paths are gated, FP cavity modulation and orthogonal dispersion system light splitting are utilized, and an industrial camera is combined to receive light signals. According to the method, the mapping relation between pixels and wavelengths can be established, the two-dimensional spectrum is compressed into the one-dimensional calibration spectrum through light intensity modulation and normalization processing, the calibration process of the orthogonal dispersion system is simplified, and the measurement precision is improved; and system drift can be compensated in real time through self-checking calibration, and the reliability of a measurement result is ensured, so that accurate calibration and measurement of a high-resolution spectrum can be realized.

A LSP broadband light source is disclosed. The light source may include a gas containment structure. The light source may include multiple jet nozzles, wherein the jet nozzles are configured to generate supersonic gas jets and direct the supersonic gas jets to collide within the gas containment structure to form a localized high-pressure region at the collision point. 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 collision point. The light source may include a pulsed-assisting laser source, wherein the pulsed-assisting laser source is configured to direct a pulsed-assisting beam to the localized high-pressure region at the collision point. The light source may include a light collector element configured to collect broadband light emitted from the plasma.

The invention relates to the field of optical measurement, in particular to a reflective interference film thickness measurement method and system for eliminating back scattering of a transparent substrate, and the method comprises the following steps: transmitting a light beam through a low-coherence-length broadband light source, and forming linearly polarized light through polarization modulation; focusing the light beam to the surface of the film through a confocal optical system; collecting reflection interference signals of the upper surface and the lower surface of the film; spatial filtering, low-coherence gating and polarization control are used for cooperatively inhibiting back scattering of the substrate. And processing the acquired interference signal, and calculating to obtain film thickness information. According to the invention, triple inhibition mechanisms are adopted for synergistic effect, and the method comprises the following steps: spatial filtering: shielding out-of-focus back reflected light through a confocal small hole; low-coherence gating: using a short coherence length to naturally suppress a reflected signal beyond a coherence range; and polarization control: further weakening stray light interference through polarization state matching, and effectively suppressing back scattering of the substrate.

The invention discloses a rotor and stator axial clearance online measuring device and method based on optical carrier microwave interference. The measuring device comprises a broadband light source, a first polarization maintaining optical fiber, an electro-optical modulator, a second polarization maintaining optical fiber, an optical fiber circulator, a first single-mode optical fiber and a coated optical fiber probe which are connected in sequence, and the coated optical fiber probe directly faces the axial end face to be measured; a first port of the optical fiber circulator is connected with the second polarization maintaining optical fiber, a second port of the optical fiber circulator is connected with the first single-mode optical fiber, and a third port of the optical fiber circulator is sequentially connected with the second single-mode optical fiber, the photoelectric detector, the signal conditioning unit, the signal acquisition unit and the digital processing unit; the signal acquisition unit is connected with the micro-control unit, the micro-control unit is connected with the microwave frequency sweep signal generation unit, and the microwave frequency sweep signal generation unit is connected with the electro-optical modulator. According to the invention, non-contact on-line high-precision measurement of the axial clearance of the rotor and the stator of the aero-engine under the conditions of limited measurement space and complex signal leading-out path can be realized.

The invention relates to a method for calibrating a light source and a spectrometer. A calibration light source includes: a broadband light source that emits light in a broad spectral range; and a filter receiving the light emitted by the broadband light source and providing structured light by applying an attenuation pattern on the received light exhibiting pattern characteristics at a plurality of spectral reference lines, the calibration light source is configured such that the emission spectrum of the structured light emitted by the calibration light source exhibits unique identifiable emission spectrum characteristics corresponding to the mode characteristics at a plurality of spectral reference lines. A method of calibrating at least one spectrometer using the calibration light source is also disclosed.

The invention discloses a vernier effect and Sagnac ring-based dual-parameter optical fiber sensor, which belongs to the technical field of optical fiber sensors and comprises a broadband light source SLED (1), a coupler (2), a sensing structure A (3), a circulator (4), a sensing structure B (5) and a spectrum analyzer (6). The device comprises a first single-mode fiber (301), a polarization-maintaining photonic crystal fiber (302), a few-mode fiber (303), a fiber Bragg grating (304), a second single-mode fiber (501), a first hollow-core fiber (502) and a second hollow-core fiber (503). Parasitic interference is avoided by grinding the end face of the hollow-core optical fiber, and the reliability of the sensor is improved; two transmission peaks appear on the fiber bragg grating inscribed on the few-mode fiber through different mode numbers in the few-mode fiber, and gas concentration and temperature sensitivity of two signals can be calculated by observing drifting of the transmission peaks; an optical vernier effect can be formed through superposition of a Sagnac interferometer formed by polarization-maintaining photonic crystal fibers and an F-P interferometer formed by hollow core dislocation, and the gas concentration and the temperature sensitivity of the sensor are improved. The sensor has the characteristics of high sensitivity, wide measurement range, simple structure, small size and the like.

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 discloses a Fabry-Perot interference type hydrogen detection device and method. The Fabry-Perot interference type hydrogen detection device comprises a broadband light source, a spectrograph, an optical fiber coupler, a sensing probe, a test gas chamber and a reference probe, the sensing probe and the reference probe are provided with sensor structures based on an optical fiber Fabry-Perot cavity, and the optical fiber coupler outputs input light emitted by the broadband light source to the sensing probe and the reference probe through a port A, a port B and a port C; light reflected by the optical fiber Fabry-Perot cavities of the sensing probe and the reference probe is output to a spectrograph through a D port, so that an interference spectrum is demodulated; hydrogen to be detected is mixed with air, then enters the test gas chamber through the gas flow rate controller, and is discharged from the outlet; the sensing probe adopts an anodic aluminum oxide / palladium film as a terminal reflector of a Fabry-Perot cavity, and an interference spectrum is detected through a spectrograph to obtain hydrogen concentration information in the environment; the reference probe adopts two single-mode optical fiber end faces to align in a sleeve and form an air Fabry-Perot cavity, and the reference probe only provides a stable reference spectrum to realize a vernier effect.

The invention discloses a method for measuring fan blade root stress based on a fiber bragg grating sensor. According to the method, 6-10 key measurement points are selected in a blade root area of a fan blade, a pair of FBG sensors is installed at each measurement point, one FBG sensor is used for stress measurement (affected by strain and temperature at the same time), the other FBG sensor is used for temperature compensation, and decoupling of temperature and strain signals is achieved. The system adopts a single-mode optical fiber, a broadband light source (the wave band is 1525-1565 nm, and the power is 10-20 mW) and a high-resolution spectrum analyzer (the resolution is smaller than or equal to 1 pm, and the sampling rate is larger than or equal to 100 Hz or 1 kHz) to collect optical signals reflected by an FBG sensor in real time, measured wavelength shift is converted into accurate strain data through temperature compensation and a strain calculation formula, and the optical signals are transmitted to the FBG sensor. And calculating a stress value by combining the Young modulus and Poisson's ratio of the material. The method has the advantages of being high in precision, high in real-time performance, resistant to electromagnetic interference and suitable for seaborne, high-altitude and other severe environments, and reliable data support can be provided for dynamic stress monitoring, fatigue life prediction and fault early warning of the fan blade.

The invention relates to an all-silicon metasurface infrared optical filter based on a bound state in a quasi-continuous domain and a manufacturing method of the all-silicon metasurface infrared optical filter. Belongs to the technical field of micro-nano optics, and particularly relates to the technical field of all-silicon metasurface infrared optical filters. The problem that application of the metasurface optical filter under an infrared broadband light source is limited is solved. The all-silicon metasurface infrared optical filter based on the bound state in the quasi-continuous domain comprises a self-supporting silicon frame, a monocrystalline silicon thin film and a nanometer cavity array. The monocrystalline silicon thin film is attached to the self-supporting silicon frame, and a nano cavity array is etched on the surface of the monocrystalline silicon thin film; one surface of the self-supporting silicon frame attached with the monocrystalline silicon film is a light incident surface, and the other surface is a light emergent surface; incident light is irradiated to the nano cavity array on the monocrystalline silicon film in a normal or a certain incident angle to excite a surface resonance mode and a bound state in a quasi-continuous domain, the surface resonance mode and the bound state in the quasi-continuous domain are subjected to interference coupling under the same resonance frequency to form a space overlapping mode, and the incident light is modulated and emitted from the other face of the self-supporting silicon frame.

The present disclosure provides a mode control system and method for controlling an output mode of a broadband light source including a photonic crystal fiber (PCF). The mode control system includes: at least one detection unit configured to measure one or more parameters of radiation emitted from a broadband light source to generate measurement data; and a processing unit configured to evaluate the mode purity of the radiation emitted from the broadband light source from the measurement data. Based on the evaluation, the mode control system is configured to generate a control signal for optimizing one or more pump coupling conditions of the broadband light source. The pump coupling condition relates to the coupling of a pump laser beam with respect to an optical fiber core of the photonic crystal fiber.

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.

This invention relates to the field of optical imaging and detection technology, specifically providing a broadband snapshot-type polarization interferometry imaging detection system and method for breast tumors. A broadband light source illuminates a breast tumor tissue sample. The reflected signal light is collected and collimated by a pre-optical system, then sequentially passes through a first and a second ray shaping unit for two shearing and two polarization state transformations, resulting in two beams of linearly polarized light and two beams of circularly polarized light. These beams are imaged by an imaging lens to an area array detector to obtain a polarization interferogram, which is then demodulated to obtain all Stokes parameters of the breast tumor tissue sample. This invention achieves broadband snapshot imaging of breast tumors with all Stokes parameters without using an analyzer, doubling the light throughput compared to traditional polarization imaging instruments using analyzers. Furthermore, this invention has advantages such as compact structure, no moving parts, easy assembly and adjustment, and no need for image registration.

The invention relates to the technical field of spacecraft structure micro stress detection, in particular to a spacecraft structure micro stress detection device and a use method thereof, and the spacecraft structure micro stress detection device comprises a displacement amplification structure, a single mode fiber, a reflector, a broadband light source and a spectrum analyzer. An optical resonant cavity formed by an optical fiber end face and a lens is combined with a displacement amplification structure, when stress acts on a spacecraft structure, the cavity length of the Fabry-Perot resonant cavity changes, so that phase movement of light is caused, and accurate measurement of the stress can be achieved by detecting the phase movement. The antenna has extremely high anti-electromagnetic interference capability, and can work stably in a complex space environment. Even under the condition of violent temperature change, high measurement accuracy can be kept, and detection of tiny stress can be achieved through the amplification effect of the displacement amplification structure. And the stress characteristic signal and the background noise can be effectively separated, so that the detection reliability is remarkably improved.

The invention provides an integrated sensor for vibration, temperature and strain monitoring and a demodulation method thereof, and belongs to the technical field of optical measurement. Comprising an optical fiber, the optical fiber is arranged on a measured object, and three Bragg gratings are connected in series on the optical fiber; the broadband light source emitter is connected with the optical fiber which is connected with the demodulation device. The broadband light source emitter emits light signals to irradiate the three Bragg gratings on the optical fiber, vibration, temperature and strain signals of a measured object are measured in real time, and the three Bragg gratings carry measured signal spectrums and reflect the measured signal spectrums back to the demodulation device for demodulation. The three key parameters of vibration, temperature and strain of the measured object are measured at the same time, and the actual state of the monitored object can be reflected more comprehensively compared with an existing single-parameter or multi-independent-sensor respective measurement mode. The problem of misjudgment of the health condition of the structure caused by insufficient monitoring of a single parameter is avoided, and richer and more accurate data support is provided for accurately evaluating the safety, reliability and residual life of the structure.

The invention aims to provide a dual-channel Fabry-Perot cavity optical fiber pressure sensor with high reliability and high precision and a preparation method thereof, the dual-channel Fabry-Perot cavity optical fiber pressure sensor comprises a base, a pressure-sensitive diaphragm and an optical fiber, the pressure-sensitive diaphragm is hydrogel based on a PVA-boric acid complex structure, a carbon dot fluorescent nano-material is doped in the hydrogel, and the optical fiber is doped in the carbon dot fluorescent nano-material. The dual-channel optical system comprises a pressure sensing channel for detecting the change of a Fabry-Perot cavity interference spectrum by adopting a broadband light source, and a damage monitoring channel for exciting carbon dot fluorescence by adopting an excitation light source and judging diaphragm damage through the change of fluorescence signal intensity. The pressure-sensitive diaphragm based on a PVA-boric acid complex structure has a self-repairing function and can drift for a long time; 0.5% F.S. / month, the service life of the sensor is prolonged, and the accuracy of pressure acquisition is improved; meanwhile, a carbon dot fluorescent nano-material with excellent biocompatibility is doped into the pressure-sensitive diaphragm, so that real-time self-monitoring of optical damage is realized, and the carbon dot fluorescent nano-material is used as an auxiliary function to improve the reliability of pressure acquisition of the sensor.

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.

The invention provides a probe type optical fiber SPR (Surface Plasmon Resonance) sensor system based on a microsphere structure. The probe type optical fiber SPR sensor is characterized in that the probe type optical fiber SPR sensor is composed of a broadband light source, a spectrograph, a broadband circulator and a microballoon structure probe type optical fiber SPR sensor, the microballoon structure probe type optical fiber SPR sensor is formed by welding a multimode optical fiber with a section of single-mode optical fiber, and the single-mode optical fiber at the welding position of the multimode optical fiber and the single-mode optical fiber is prepared into the microballoon structure; the nano-silver film is deposited on the surface of the single-mode optical fiber, the polydimethylsiloxane film and the polyvinyl alcohol film are coated section by section along the outer surface of the nano-silver film, and the nano-gold film is plated on the end face of the tail end, so that the temperature parameter and the humidity parameter can be simultaneously measured in various sensing application scenes. The device is simple in structure, flexible and compact, and can be widely applied to the optical fiber sensing application fields of chemistry, biology, medicine, life science and the like.

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).

The invention provides an optical fiber sensor design based on an optical fiber Mach-Zehnder interferometer (MZI), and particularly relates to an in-fiber ladder-shaped special structure, which is particularly suitable for online monitoring of a reaction process in a microfluidic system and can measure refractive indexes of three points in the reaction process at the same time. The optical fiber sensor is formed by welding a common single-mode optical fiber, a coreless optical fiber and a stepped single-mode optical fiber. The broadband light source emits an optical signal through the single-mode optical fiber, a high-order mode excited in the coreless optical fiber enters a cladding of the single-mode optical fiber to be transmitted, due to the effect of an evanescent field and the influence of the environment refractive index and the temperature, the signal excites multiple modes in the optical fiber through the cascaded coreless optical fiber, and the high-order mode is transmitted in the cladding of the single-mode optical fiber. And an optical path difference is introduced through a step structure positioned between the two coreless optical fibers. When a solution to be detected is immersed into the stepped groove, the structure can generate refractive index change, and the propagation path of light can be adjusted by finely adjusting different sizes of the stepped groove to generate different phase differences, so that the light is coupled back into a fiber core of the single-mode fiber at the other end in the coreless fiber cascaded at the other end; and due to the special step-shaped structure, the refractive index values at three positions of the central step can be measured at the same time. According to the design, the structure of a traditional Mach-Zehnder interferometer is optimized, the number of elements is reduced, the stability and reliability of the system are improved, and the Mach-Zehnder interferometer is suitable for the fields of precision measurement, environment sensing, optical fiber communication and the like.

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 provides a photoacoustic sensor and a sensing system for trace C4F7N gas detection, and relates to the technical field of C4F7N gas detection. The system comprises a broadband light source used for generating wide-spectrum infrared light; the modulation unit is used for carrying out intensity modulation on the wide-spectrum infrared light; the photoacoustic cell is used for receiving the modulated light beam and exciting C4F7N gas to generate a photoacoustic signal; the sound detector is used for detecting a photoacoustic signal; the signal processing unit is used for processing the photoacoustic signal to obtain the C4F7N gas concentration; the broadband light source is a blackbody radiation source; the photoacoustic cell is a spherical Helmholtz resonant cavity, is of a differential structure and comprises two spherical resonant cavities; and the two sound detectors are symmetrically arranged on the cavity walls of the two spherical resonant cavities. The black-body radiation source is used as a broadband light source, and the differential spherical Helmholtz photoacoustic cell is coupled with the black-body radiation source, so that the system cost and the integration complexity are remarkably reduced on the premise of keeping the advantage of high sensitivity.

The invention discloses an optical detection system and method, and belongs to the technical field of optical non-contact measurement. According to the invention, a low-coherence wide-spectrum light source is adopted, a dispersion element and an array detector are combined to separate a wide spectrum in space so as to construct a plurality of parallel independent wavelength measurement channels, and meanwhile, an envelope extraction algorithm based on empirical mode decomposition, Hilbert transform and window length adaptive Savitzky-Golay filtering is integrated; real-time quality evaluation and dynamic weighted fusion are carried out on each channel signal, vibration measurement continuity and stability in a severe speckle environment are remarkably improved, high-dimension wavelength diversity is realized at low cost, real-time quality evaluation and weighted fusion are carried out through a self-adaptive envelope extraction algorithm, and the accuracy of vibration measurement is improved. And finally, a vibration measurement value of which the signal-to-noise ratio and the measurement precision are remarkably improved is output.

The invention provides an optical fiber defect detection system and method, and the system comprises an optical fiber fixing groove which is used for fixing the two ends of a to-be-detected optical fiber after the to-be-detected optical fiber passes through refractive index matching oil in an optical amplification device; the broadband light source is arranged on the light inlet side of the optical amplification device and is used for emitting detection light to the optical amplification device; the visible light source is connected with one end of the to-be-measured fiber and used for emitting visible light to the to-be-measured fiber; the optical amplification device is used for moving along the axis direction of the optical fiber to be detected and amplifying the detection light; after the detection light passes through the refractive index matching oil in the optical amplification device, the detection light is emitted to the optical imaging device from the light emitting side of the optical amplification device; and the optical imaging device is used for generating a corresponding optical imaging result according to the detection light emitted by the light emitting side of the optical amplification device and the visible light passing through the to-be-detected optical fiber so as to obtain defect detection information of the to-be-detected optical fiber. According to the invention, the accuracy and efficiency of optical fiber defect detection are improved.

The invention provides an exhaled gas synchronous detection device and method based on an aliasing spectrum model, and relates to the technical field of exhaled gas detection. The device comprises an LED broadband light source, a band-pass filter, a collimating lens combination, an optical resonant cavity, a converging lens, an optical fiber, a grating spectrometer, a detector and an upper computer. Infrared light emitted by the LED broadband light source sequentially passes through the band-pass filter, the collimating lens combination, the optical resonant cavity, the converging lens, the optical fiber and the grating spectrometer to form a composite light signal, the detector converts the composite light signal into an aliasing spectrum signal, and an exhaled gas synchronous detection method based on an aliasing spectrum model is integrated in the upper computer. The aliasing spectrum model carries out decoupling analysis on aliasing spectrum signals. According to the technical scheme, the problems that in the prior art, when ethyl alcohol and n-pentane are synchronously detected, aliasing interference of adjacent spectral lines is likely to happen, and the detection cost is high are solved.

A calibration light source includes: a broadband light source that emits light in a broad spectral range; and a filter that receives light emitted by the broadband light source and provides structured light by imparting an attenuation pattern to the received light that has pattern features at a plurality of spectral reference lines, such that an emission spectrum of the structured light emitted by the calibration light source has identifiable emission spectrum features that correspond to the pattern features at the plurality of spectral reference lines. Furthermore, a method for calibrating at least one spectrometer using the calibration light source is disclosed.

A silicon-based atomic clock for use in an electronic device structured to employ spin-dependent recombination in the silicon crystal. In at last one implementation, a source of energy configured to excite the impurity atoms within the silicon crystal includes a source of thermal energy but not a source of light or a source of broadband light that is not matched to said energy level transition of the impurity atoms.