107results about How to "Large measurement dynamic range" patented technology

The invention relates to an optical spectrometer and a calibration method thereof. The optical spectrometer comprises a monochromator used for dividing the measured light into monochromatic lights, a photomultiplier used for receiving the monochromatic lights; the monochromator and the photomultiplier are optically connected. The photomultiplier is electrically connected with a microcontroller by a signal processing circuit. The optical spectrometer is characterized by further comprising a reference light source used for creating reference light; the reference light source which is alight-emitting diode is connected with the micro-controller. Compared with the prior art, the optical spectrometer and the calibration method thereof have the advantages as follows: 1. reasonable design, simple structure and large measuring dynamic range are ensured; 2. the absolute sensitivity of the photomultiplier is reasonably calibrated, therefore, the response linearity of the optical spectrometer is good; 3. thermostatic control is carried out to a reference detector, the reference light source and the photomultiplier, thus effectively enhancing the work stability of the optical spectrometer; and 4. the performance of the optical spectrometer is substantially enhanced under the condition that a small amount of cost is increased.

The invention discloses a micro-accelerometer and a preparation method thereof, belonging to the technical field of processing micro inertia devices. The micro-accelerometer is arranged on a package substrate which is formed by stacking an upper surface plate, a lower surface plate and a plurality of middle substrates, wherein a signal detection circuit of the micro-accelerometer is attached on the upper surface plate; a sensitive element of the micro-accelerometer is embedded in the middle substrates, i.e. the middle substrates with cavities form a frame of the sensitive element; a flexible hanger and a sensitive mass block of the sensitive element are arranged in the cavities, and one end of the flexible hanger is connected with the sensitive element, while the other end is fixed on the frame; metal electrodes are respectively sputtered on the sensitive mass block and the surface of the frame corresponding to the sensitive mass block so as to form a flat plate sensitive capacitor, or a metal piezoresistive thick-film pattern is deposited at a connecting part of the flexible hanger and the inner side surface of the frame so as to form a metal piezoresistive strain gauge. The micro-accelerometer has high sensitivity and high-temperature resistance and can be fused into a whole with a system level package substrate, thus the micro-accelerometer has low processing difficulty and cost.

The invention provides a fiber F-P sensor cavity length wavelet phase extraction demodulation method. At first, the interference spectrum is calculated by means of a fast fourier transform algorithm to obtain a cavity length value to be a cavity length rough measuring value; the searching scope of a scale factor is determined by taking the 2-3 times of the precision of the fast fourier transform algorithm as the radius, and the phase information corresponding to each point in the interference spectrum is solved by continuous complex wavelet transform; and the cavity length value of the fiber F-P sensor is calculated by the linear gradient obtained by the linear fitting phase and wavenumber to be the final cavity length value. The absolute measurement of the F-P sensor cavity length can be achieved, so that the high-precision and high-resolution measurement of physical quantity can be achieved.

In the present invention, a small section of polarization preserving fiber transducing head is added into closed light path of total polarization SAGNAC interferometer applying Y waveguide modulator and wide spectrum light source to create condition for generating polarization nonreciprocal after certain process is applied, generated polarization nonreciprocal phase-shift and temperature acted on transducing head is presented in linear ratio relationship when light path is in operation so phase shift can be measured accurately by utilizing circuit the same as used in close ring optical fibre gyro detection and furthermore temperature measurement is realized.

The invention provides a laser far field focal spot measurement method based on orthogonal light wedge dichroism and a focal spot reconstruction algorithm. A measurement apparatus used in the method comprises a pair of orthogonal light wedges, a focusing lens, a CCD imaging device and a computer system. Beam splitting is performed to an incident laser beam through two light wedge device whose wedge angle directs to a mutually orthogonal direction and the incident laser beam is converged through the focusing lens. After that, the incident laser beam forms sub-spot array with successively damped peak strength on a CCD photosensitive surface in a lens plane. An effective method is used to carry out splicing fusion on each of the measured sub-spot. And finally, complete laser far field focal spot intensity distribution can be obtained through reconstruction. According to the invention, CCD dynamic measurement range can be greatly developed; a lot of high-frequency side-lobe information of the actual focal spot can be extracted from CCD background noise so that accurate measurement and light beam quality evaluation can be possibly achieved.

A miniature biochemical analyzer using dual-spectrum detection is composed of the first optical channel consisting of adaptive regulatable light source, optical attenuator, the first specimen chamber, the first integrated spectrometer and the first A / D converter, the second optical channel consisting to the second specimen chamber, the second integrated spectrometer and the second A / D converter, and the computer data processing system. Its advantages include wide dynamic range and more functions of adaptive dynamic regulation, self scaling, and real-time error correction.

The invention relates to a charge measuring circuit, which comprises an IV conversion circuit, a plurality of voltage following circuits, a plurality of voltage-to-charge circuits and an ASIC circuit,and is characterized in that the IV conversion circuit is used for converting detected charge pulse signals into voltage pulse signals; the voltage following circuits are used for performing voltagefollowing on the voltage pulse signals to generate following voltage pulse signals and performing buffer isolation on front and back circuits; the plurality of voltage-to-charge circuits are identicalto the plurality of voltage following circuits in number, arranged at the rear ends of the voltage following circuits in a one-to-one correspondence manner and used for converting the voltage pulse signals outputted by the voltage following circuits into charge pulse signals, and capacitor with different capacitance are connected to the voltage-to-charge circuits respectively so as to expand themeasurement dynamic range; and the ASIC circuit is used for measuring the charge pulse signals outputted by the plurality of voltage-to-charge circuits respectively. The charge measuring circuit has high measurement accuracy, large dynamic range and good linearity.

The invention belongs to the field of non-contact optical measurement of geometrical quantities, and particularly relates to a non-contact measurement method for geometric parameters of an optical part and a measuring device thereof. The invention aims to overcome the defects of low speed, small dynamic range for measurement, high cost and inapplicability to on-line quick measurement in the priorart. In order to overcome the defects, the technical scheme provided by the invention is a non-contact measurement method for geometric parameters of an optical part, which comprises the following steps: modulating the collimated light by using an electric scanning optical switch to form annular collimated light, converging the collimated light through an axicon lens (Fresnel lens) to realize convergent points at different distances, collimating by utilizing the convergent points and identifying the surface of the optical part, thereby measuring the geometrical thickness and motion distance of the optical part and the center height of the optical lens. The invention has the advantages of low cost, high stability, simple instrument structure and easy processing, is suitable for quick on-line measurement, and can realize wider dynamic measurement range compared with spectral scanning instruments.

The digitalized electronic meter system with each voltage current mutual-inductor output connect with the corresponding electronic meter module and linking with the input end of the electro-optical conversion module, whose output links an optical fiber, all of which are combined and through an optical cable connected with the electro-optical conversion and signal treatment module, with the electro-optical and signal treatment module converting the optical signal into the digital electro signal, and its output end connects with the digitalized centralized electro-optical meter system. The optical cable replaces the electric cable as the secondary signal transmission circuit, realizes the digitalized accuracy meter of the high pressure electric energy, effectively solves the current complex error big difficulty, greatly simplifies the secondary signal transmission circuit and greatly alleviates the on-site construction working load.

The present invention discloses a pentaprism scanning detection method for an aspheric reflector. The method comprises: 1) arranging a device required for detection; 2) performing scanning detection of a single bus; 3) performing scanning detection of the next bus of the rotation angle a of the aspheric reflector after the scanning of the single bus is completed; and 4) performing detection data processing and fitting. All the angle differences are transited to the slope values of the corresponding positions of the reflective surface of the aspheric reflector, the slope values are fitted with the Zernike gradient polynomial, and the low-order surface-shaped error parameters of the aspheric reflector are obtained. The high-precision low-order surface-shaped error parameters of the aspheric reflector can be obtained.

The invention relates to a common-optical path polarization point diffraction phase-shift interference wavefront sensor, which comprises a polaroid, a first double refraction lens, a second double refraction lens, a phase-shift interference system, a CCD (Charge Coupled Device) sensor and a computer, as well as a polarization PDI (Point-diffraction Interferometer) mask plate provided with a needle hole and additionally arranged at a confocal plane of the first and second double refraction lenses, wherein a linearly polarized light beam to be detected is divided into two beams by the first double refraction lens, E light is converged at the needle hole of the polarization PDI mask plate to be subjected to small hole diffraction so as to serve as reference light, and O light passes through the polarization PDI mask plate nearly without decrement to serve as testing light; the reference light and the testing light pass through the phase shift interference system to form a four-frame time or space phase shift interference figure; streak contrast gradient is adjusted through rotating the polaroid; and then a phase shift algorithm is adopted to re-establish a phase position of a wavefront to be detected. According to the invention, the wavefront sensor adopts a common-optical path, dispenses with special reference light, is strong in system stability and adjustable in streak contrast gradient, and is suitable for high-precision detection for dynamic and static stage of various wavefront phase positions.

The invention discloses a distributing photometer including two independent bases, a rotary arm which rotates around a horizontal rotary central line arranged on a first base, an ellipse circumrotate plane optical reflector, a first optical detector, a second optical detector and a second laser ejector are arranged on the rotary arm and rotates around the tested lighting source with the rotary arm, the tested lighting source can rotate around the own vertical axis, a vertical round or ellipse plane optical reflector is arranged on the second base; a lighting beam from the tested lighting source is reflected to the vertical optical reflector by rotating the optical reflector, normal incidence of the lighting beam on the first optical detector is reflected by the vertical optical reflector, tests of large and medium lamps and lanterns can be implemented with long distance; the second optical detector aims at the tested lighting source directly, thus implementing tests of small lamps and lanterns of short distance. The testing chamber of the invention occupies less space with high testing precision, no extra calibration or adjusting instrument is needed in implementing tests of diverse testing arm length (testing distance) by adopting different optical detectors.

The invention provides a thunder and lightening detector based on the optics principle. The thunder and lightening detector is formed by an optical link circuit and comprises a detection control center, optical fibers and a sensing probe. The detection control center comprises a laser unit, a photoelectric detector and a digital oscilloscope. Light emitted by the laser unit is transmitted to the sensing probe through the optical fiber. The sensing probe comprises an electric-light / magneto-optical crystal. The light is converted to linearly polarized light and then is propagated through two mutually-perpendicular linearly polarized light waves. The light emitted from the electric-light / magneto-optical crystal is converted from changes of the polarization state to changes of emergent light intensity and then is detected by the photoelectric detector. Signals detected in an electromagnetic field can be observed on the digital oscilloscope. The thunder and lightening detector based on the optics principle has the advantages that the sensing probe or an observation station of the thunder and lightening detector is completely formed by passive optical elements, and the thunder and lightening detector has the advantages of being small in size, light in weight, prompt in response, free from electromagnetic interference, large in measurement dynamic range, free from power supply and a communication system, and the like.

The invention relates to an on-site verification apparatus for an optical fiber current sensor, a usage method of the on-site verification apparatus and application of the on-site verification apparatus. The on-site verification apparatus for the optical fiber current sensor includes an optical fiber current detection sensing module and an optical fiber current detection processing and display module. The optical fiber current detection sensing module is composed of a light source, a linear polariscope, a polarization separator, a modulator, a transmission optical fiber, a 1 / 4 wavelength filter, an optical fiber sensing head, a reflector and a photoelectric detector. Proceeding from installation and debugging of the optical fiber current detection sensing module, the optical fiber current sensor on-site verification apparatus has reasonable control steps, is easy to operate, and can carry out efficient, economic and accurate error detection and quantity transmission on a DC heavy current sensor working on site for a long time; the optical fiber current sensor on-site verification apparatus is suitable for detecting and verifying a current detection sensor working on site for a long time in fields of electrolytic aluminum, electrolytic copper, electric smelting, electroplate and other electrochemical engineering; the on-site verification apparatus for the optical fiber current sensor is good in safety performance, large in measuring dynamic scope, high in frequency response degree, small in size and light in weight; and by adopting the on-site verification apparatus for the optical fiber current sensor, the measuring precision of a current detection apparatus can be raised, and needs of safety and stabilization of a power supply system are met.

The invention discloses a mirror displacement measurement method based on feature pattern reflecting. A feature pattern is displayed on a display screen and projected to a mirror, and after reflected, the feature pattern is photographed with a CCD (charge coupled device) camera. The CCD camera photographs and records the reflected feature pattern, namely the CCD camera photographs and records a virtual image formed by the mirror on the display screen. When the mirror moves, the virtual image photographed by the CCD camera moves meanwhile. Inner and outer parameters of the CCD camera can be calibrated to obtain a displacement distance of the virtual image formed by movement of the mirror; according to the law of light reflection, the displacement distance of the mirror is half of that of the virtual image, and displacement of the mirror is obtained.

The invention provides a photoelectric oscillator for measuring a magnetic field and a measuring method thereof. The oscillator comprises a light source, a first optical coupler, an adjustable opticaldelay module, an optical fiber sensing head with a magnetostrictive material, a second optical coupler, an electro-optic modulator, a dispersive element, an optical amplifier, a photodetector, a microwave amplifier and a power splitter; the first optical coupler and the second optical coupler and the optical fiber sensing head with the magnetostrictive material therebetween and the adjustable optical delay module form a Mach-Zehnder interferometer MZI; the optical fiber sensing head with the magnetostrictive material is located in one arm of the MZI for sensing the magnetic field for corresponding telescopic deformation. The oscillator utilizes a microwave photon technology to perceive the magnitude of the magnetic field through the optical fiber, converts the magnetic field change into the change of the frequency of the oscillation signal of the photoelectric oscillator, and solves the problems that a magnetic field measurement demodulation method is complicated, the sensitivity is low and the stability is poor.

The invention discloses a fiber interference technology-based sleep health monitoring system and relates to the technical field of intelligent health monitoring. The fiber interference technology-based sleep health monitoring system is characterized by comprising a flexible structure in contact with human body, a narrow-linewidth semiconductor laser device, a fiber interference system and a signalmodulator, wherein the narrow-linewidth semiconductor laser device, the fiber interference system and the signal modulator are sequentially connected, and the fiber interference system is connected with the flexible structure; the fiber interference system is composed of a 2*2 coupler, a 3*3 coupler, two optical fibers, two reflectors and three photoelectric detectors and is connected in a Michelson mode or a Mach-Zehnder mode. The fiber interference technology-based sleep health monitoring system acquires external disturbance information by collecting and analyzing optical signals from threedifferent phases, analyzes and processes the three acquired optical signals through the signal modulator to acquire information during sleep of a user such as pressure, breath and heartbeat. The fiber interference technology-based sleep health monitoring system has the advantages of being high in sensitivity, resistant to electromagnetic interference, diversified in data acquisition and high in practicality.

A cable-fault on-line detection device based on a wide-band chaotic signal and a detection method thereof are disclosed. An electrical chaotic source, a power divider, a data acquisition card and a computer are included. An output terminal of the electrical chaotic source is connected to an input terminal of the power divider. An output terminal of the power divider comprises a low power signal output terminal and a high power signal output terminal. The low power signal output terminal is connected to an analog quantity input terminal of the data acquisition card. The high power signal output terminal is connected to an input terminal of a T-shaped connector. One output terminal of the T-shaped connector is connected to the analog quantity input terminal of the data acquisition card. The other output terminal of the T-shaped connector is connected to a detected cable and then is connected to the analog quantity input terminal of the data acquisition card. A digital quantity output terminal of the data acquisition card is connected to an input terminal of the computer. The detection device takes a chaotic signal generated by a single-stage Colpitts circuit as a detection signal. A chaotic signal correlation method is used to measure a fault point of the cable so that cable open circuit point positioning is realized.

The invention discloses a two-stage TDC circuit applied to process non-controlled detection. The TDC circuit comprises a first-stage annular delay chain TDC, a time margin selection circuit and a second-stage vernier type TDC. The first-stage annular delay chain TDC performs coarse quantization on input two paths of signals, and meanwhile, the measurement dynamic range is expanded by utilizing anannular structure; the time margin selection circuit transmits the time margin left after coarse quantization is carried out and less than one delay unit to a second stage for fine quantization; the second-stage vernier type TDC performs further fine quantization on the time margin left in a first stage by using two delay chains with different speed, and the measurement resolution can be adjustedthrough the difference value of the delay units on the two delay chains. According to the TDC circuit, the contradiction between the area and the dynamic range and the contradiction between the resolution and the design complexity in a traditional TDC circuit are effectively solved, and various requirements on the TDC circuit of process non-controlled detection of a large-scale digital integratedcircuit based on delay measurement can be met.

In order to solve the technical problems that the existing scheme for measuring the surface shape of the large-aperture planar optical element is easily influenced by air flow disturbance and vibration, the measurement dynamic range is small, the surface shape measurement resolution is not high, the scheme cannot be applied to surface shape measurement of various postures in place, and measurementcannot be performed when Power exists in the surface shape of the large-aperture planar optical element, the invention provides an in-situ surface shape splicing measurement device and method for a large-aperture plane optical element. A laser, a semi-transparent semi-reflective mirror, a collimator objective, a diaphragm, a small-hole diaphragm, a collimator eyepiece, a binary optical device, adetector, an attenuation plate, a far-field detector, a drive controller, an electric control diaphragm, a reflector array, a pyramid prism array and a six-degree-of-freedom motion platform are utilized, the dynamic high-precision surface shape splicing measurement of the measured large-aperture planar optical element under various postures is realized, and the measurement precision is not influenced by the external environment.

The invention relates to a bilateral multi-plane inclined wave surface interferometer. The system comprises a light source module, a first interferometer host, a second interferometer host, a double-sided standard flat plate, a double-sided standard flat plate adjusting frame, a measured non-transparent flat plate element, a single-point thickness measuring sensor and a control processing unit, wherein the first interferometer host and the second interferometer host are both multi-plane inclined wave surface interferometers. The interferometer is advantaged in that parallel measurement light in multiple directions is emitted through a point source array generator to measure the bilateral morphology and thickness of the measured non-transparent flat plate element, and the interferometer hasadvantages of being large in measurement dynamic range, high in measurement precision and efficiency, flexible in phase shift mode and capable of achieving in-situ calibration of system errors.

The invention discloses a thermally induced voltage material and application thereof, belonging to the technical field of transverse thermoelectric materials and devices. A (Ca / Sr) 3Co4O9 or (Ca / Na) xCoO2 (x=0. 52-0.8) thin film is selected as thermally induced voltage material in the present invention. As the thermal field or the thermal fluid induce voltage material of the invention has high signal response rate and does not need to establish heat balance, the response time is fast, and the signal repeatability and the linear relationship are good; the temperature gradient of the thermally induced voltage thin film is converted into a larger thermoelectric voltage signal by directly using heat source or thermal field heating, which has no time term, strong anti-interference ability, no power supply driving, no refrigeration and amplification, and can be used to fabricate some sensitive and fast thermally induced voltage detection devices. The temperature and thermoelectric potentialare perpendicular to each other, and can modulate dimension and direction independently. It is easy to fabricate arrays to detect transient thermal field or heat flux. Compared with the current devices, the material has great breakthrough and advantages, and can be used in the industrial and military fields of pulse or continuous thermal signal detection, transient thermal field and thermal fluiddetection.

Disclosed is a structured light method for small-angle measurement. A measuring system comprises a CCD camera, a display screen and a computer. A feature pattern is displayed on the display screen and projected onto a measured object or a reflector fixed on the object, and the pattern is reflected and then shot by the camera. The reflected feature pattern is shot by the CCD camera, and in other words, a virtual image formed through the reflector on the display screen is shot by the CCD camera. When the object rotates, the virtual image shot by the camera rotates too. The rotating angle of the virtual image can be calculated by analyzing the virtual image before and after rotation. According to the light reflection law, the rotating angle of the object is half of the rotating angle of the virtual image. The measuring system is simple in structure, convenient to use, high in sensitivity, free of special requirements for the environment, and capable of conducting detection in a workshop.

The present invention relates to a precision measurement equipment of altrashort laser pulse time synchronization. It makes special two ultrashort laser pulse which are from different directions and collected at one point pass through a thin reflection-transmission lens and output to form a beam of collinear laser beams, then make it pass through a 1 / 4 wave plate and polaroid and divide it into two beams of laser whose intensities are identical and polarization directions are mutually perpendicular, then makes said two beams of laser income into a nonlinear crystal, and utilizes interaction between pulses in the nonlinear crystal to obtain a series of secondary harmonic pulses, the utilizes a linear array CCD connected with oscilloscope to measure spacial distribution of secondary hoarmonic pulses.

The invention discloses a polar plate of a micro-disc type focused logging device. The polar plate comprises the polar plate and polar plate electrodes arranged on the plate surface of the polar plate, wherein the polar plate is in the shape of a rectangle, the two ends of the polar plate are in circular arc-shaped structures, and the polar plate electrodes comprise a main electrode A0 at the center of the plate surface of the polar plate, as well as an annular electrode M0 and an annular electrode A1 which are sequentially distributed on the periphery of the main electrode A0 from inside to outside; and two groups of semi-circular electrodes, namely a monitor electrode M1 and a monitor electrode M1', as well as monitor electrode M2 and a monitor electrode M2', are symmetrically distributed on the two sides of the annular electrode A1, the electrode distances from the monitor electrode M1, the monitor electrode M2', the monitor electrode M2 and the monitor electrode M1' to the main electrode A0 are equal, and after signals acquired by the two groups of the monitor electrodes are synthesized by a transformer, the two groups of the monitor electrodes controls the main current measurement. Since the electrodes of the novel polar plate are the two groups of the semi-circular type electrode structures and the overall dimension and the shape of the polar plate are further changed, the novel polar plate has the advantages of stable electric field, a large measurement dynamic range, high measurement precision, good layering capability and the like.

The present invention relates to a capacitive distance measurement method. The method comprises the steps of using a control unit to determine the time when an excitation unit applies a first excitation signal; using the excitation unit to apply the first excitation signal to a probe; using a capacitance-voltage conversion unit to obtain a first voltage signal corresponding to the capacitance formed between the probe and a measured member; using the control unit to determine the time when a logarithm amplification processing unit carries out the logarithm amplification processing; using the logarithm amplification processing unit to carry out the logarithm amplification processing on the first voltage signal to obtain a second voltage signal; using a data acquisition conversion unit to convert the second voltage signal into a third voltage signal; using the control unit to convert the third voltage signal into a distance value. The present invention also discloses a capacitive distance measurement device and a calibration method thereof.

The invention discloses a device for measuring a lightning current parameter by using an optical fiber. The device comprises an optical transmission module, an optical sensing module, an optical receiving module and a signal processing module. According to the device, a Faraday magneto-optical effect principle is utilized, the optical fiber is taken as a medium, and the magnitude of measured current is calculated reversely by measuring the rotation angle of the polarized plane of light waves passing through a magneto-optic material under the action of the a lightning current magnetic field. The device has high sensitivity and interference resistance, can be arranged on a lightning arrester for monitoring lightning current data, is used for counting and analyzing data of lightning current, and is suitable for measuring lightning current generated by a lightning current simulative generator.

The invention provides an optical fiber vibration sensor, which comprises a narrow linewidth laser, an optical fiber circulator, a single mode fiber, an optical fiber connector, a sleeve and an acquisition and processing module. The optical fiber circulator is connected to the narrow linewidth laser, the first end of the single mode fiber and the acquisition and processing module respectively. Thesecond end of the single mode fiber penetrates through the optical fiber connector. The second end of the optical fiber connector is embedded into the first end of the sleeve. A cantilever beam is arranged on the end face of the second end of the sleeve, and a Fabry-Perot cavity is arranged between the second end of the single mode fiber and the cantilever beam. The cantilever beam senses external force to generate vibration, so that the length of the Fabry-Perot cavity changes. The continuous light output by the narrow linewidth laser enters the Fabry-Perot cavity through the optical fiber circulator and the single mode fiber. The cantilever beam reflects the continuous light and generates reflected light, and the light intensity of the reflected light changes along with the length of the Fabry-Perot cavity. The reflected light is transmitted to the acquisition and processing module through the single mode fiber and the optical fiber connector. The acquisition and processing module acquires the vibration intensity according to the light intensity of the reflected light. The optical fiber vibration sensor is high in measurement precision and simple in preparation process.

The invention discloses a real-time spectrum analysis device and a method of a fiber bragg grating. The device comprises a light source module, a sensing unit, a chromatic dispersion unit, a recording module and a to-be-tested unit. The method comprises the following steps of obtaining a 'frequency-time mapping' relation by using the light source module, the sensing unit, the chromatic dispersion unit and the recording module; replacing the sensing unit with the to-be-tested unit; collecting and obtaining a time-domain impulse signal by adopting the light source module, the to-be-tested unit, the chromatic dispersion unit and the recording module; and converting the time-domain impulse signal into a frequency domain signal by the 'frequency-time mapping' relation, so as to achieve ultra-fast spectrum analysis on the FBG (fiber bragg grating). The speed that an oscilloscope collects the time-domain signal is higher than the speed that a spectrograph is directly adopted for measuring a spectral line, so that rapid analysis on the spectrum can be achieved. Meanwhile, a femtosecond laser pulse is utilized as a light source, so that a large dynamic measurement range can be achieved.