43 results about "Absorption band" patented technology

The invention belongs to the technical field of water pollutant identification, and particularly relates to a water pollutant distinguishing method and system based on multi-source spectrum fusion. According to the method, ultraviolet visible spectrum data and three-dimensional fluorescence spectrum data are effectively integrated in a multi-source spectrum data fusion mode, so that the characteristic information of water pollutants is captured, stably appearing characteristic absorption wavebands can be positioned by utilizing the ultraviolet visible spectrum data, and the water pollutants can be accurately detected. The method comprises the following steps: identifying a characteristic sub-region capable of representing the fluorescence response characteristic of a pollutant through three-dimensional fluorescence spectrum data, in a characteristic extraction stage, performing first-order derivative operation on an ultraviolet visible spectrum to position an absorption peak position, calculating curvature distribution of a three-dimensional fluorescence spectrum to identify the characteristic sub-region, and when a fusion characteristic is generated, performing first-order derivative operation on the three-dimensional fluorescence spectrum to identify the characteristic sub-region; according to the method, the key operation parameters are subjected to grid search optimization, and the optimal key operation parameter combination is screened out by performing multiple rounds of iterative training and evaluation on a preset training set and a verification set, so that the recognition performance of the real-time collected water sample is improved.

The invention relates to a PVB (polyvinyl butyral) composite film as well as a preparation method and application thereof. The PVB composite film is prepared from the following raw materials in parts by weight: 100 parts of PVB resin, 1-10 parts of nano praseodymium oxide, 1-10 parts of a dispersing agent, 0.01-1 part of a coupling agent and 20-50 parts of a plasticizer. The nano praseodymium oxide is added into the PVB resin, and the infrared absorption band of the PVB composite film is optimized by utilizing the infrared absorption performance, chemical stability and heat-resistant stability of the nano praseodymium oxide, so that infrared radiation can be efficiently blocked, and the excellent heat insulation effect and long-term use stability of the PVB composite film are realized. Furthermore, the nano praseodymium oxide is modified by a coupling agent, so that the dispersion uniformity of the nano praseodymium oxide in the PVB resin and the interface bonding force of the nano praseodymium oxide and the PVB resin are improved, the light transmittance loss of the PVB composite film is reduced, and the mechanical property and the heat insulation property of the composite film are improved.

Provided is a light-emitting element which includes a light-emitting layer containing a phosphorescent compound, a first organic compound, and a second organic compound between a pair of electrodes. A combination of the first organic compound and the second organic compound forms an exciplex (excited complex). An emission spectrum of the exciplex overlaps with an absorption band located on the longest wavelength side of an absorption spectrum of the phosphorescent compound. A peak wavelength of the emission spectrum of the exciplex is longer than or equal to a peak wavelength of the absorption band located on the longest wavelength side of the absorp-tion spectrum of the phosphorescent compound.

Light-emitting element comprising: a first electrode (103); a light-emitting layer (703) above the first electrode (103), wherein the light-emitting layer (703) comprises a guest material and a host material; and a second electrode (108) above the light-emitting layer (703), where a fluorescence spectrum of the host material and a phosphorescence spectrum of the host material overlap the absorption band on the longest wavelength side (the side of lowest energy) in the absorption spectrum of the guest material, wherein the difference between the energy value of the maximum of the fluorescence spectrum of the host material and the energy value of the maximum of the absorption band on the side of the lowest energy in the absorption spectrum of the guest material, wherein this maximum has an absorption wavelength corresponding to a direct transition from the singlet ground state to the lowest excited triplet state of the guest material, is 0.2 eV or less, wherein the host material is a mixture of a heterocyclic compound and an aromatic amine compound or carbazole compound, and where the level of a triplet excitation energy of the host material is higher than the level of a triplet excitation energy of the guest material.

The invention relates to the field of luminescent materials, and particularly discloses near ultraviolet excited blue fluorescent powder and application thereof, the molecular formula of the fluorescent powder material is Ca3Lu2Si3O12: xCe < 3 + >, x is the molar doping amount of Ce < 3 + >, 0 lt; and x is less than or equal to 0.10. The preparation method of the series of blue fluorescent powder adopts a high-temperature solid-phase method for synthesis, is mature in process and has large-scale production potential. The fluorescent powder shows nearly 100% internal quantum efficiency, the value of the internal quantum efficiency is as high as 99%, the fluorescent powder has broadband emission in the range of 350-600nm and has high matching degree with a blue light absorption band of a plant photosynthetic pigment, and a blue light LED device with high brightness and good matching with plant pigment absorption can be obtained by assembling the blue light material and a 365nm purple light chip.

The application discloses a kind of quasi-terahertz wave full absorption metasurface absorber and preparation method thereof, the structure of absorber includes: the design of silica layer, graphene multilayer structure and metal base;The structural design of top silica four pyramid;The structural design of multilayer graphene electric control simultaneously.The application uses multilayer graphene to enhance terahertz wave absorption, through the control of external bias voltage, can control the absorption intensity of low-frequency absorption band, realize certain degree of tunability.In terahertz wave band, the metasurface absorber proposed in the application can reach 96.33% average absorption in 0.5-10.0THz band.The application can effectively solve the problem that current absorber can only absorb part of terahertz wave band, open a new road for high performance of terahertz wave absorption field device.

This invention relates to the fields of atmospheric physics and remote sensing, and particularly to a method and system for obtaining upward atmospheric transmittance in the infrared absorption band. The method includes: directly measuring solar spectral data from the ground; simultaneously measuring atmospheric composition profiles in the directions of the sun and satellite; calculating the downlink measured transmittance based on the measured data; calculating the downlink and uplink theoretical transmittance based on the profiles using a radiative transfer model; comparing the downlink measured and theoretical transmittance to verify errors; calculating a correction coefficient based on the uplink and downlink theoretical transmittance; and using this correction coefficient to correct the downlink measured transmittance to obtain the final uplink atmospheric transmittance. The system includes spectral measurement, profile measurement, and data processing units for implementing the above method. This invention combines the high precision of direct measurement with the physical extrapolation capability of theoretical models, solving the problem of obtaining high-precision uplink atmospheric transmittance and providing a reliable technical solution for satellite remote sensing calibration.

Light-emitting element, comprising: a pair of electrodes; and a first light-emitting layer and a second light-emitting layer between the pair of electrodes, where the second light-emitting layer is in contact with the first light-emitting layer, wherein the first light-emitting layer comprises a first phosphorescent compound, a first organic compound and a second organic compound, wherein the second light-emitting layer comprises a second phosphorescent compound, the first organic compound and the second organic compound, wherein the first organic compound and the second organic compound form an exciplex, the first organic compound is a nitrogen-containing heteroaromatic compound, where the second organic compound is a π-electron-rich heteroaromatic compound or an aromatic amine compound, where a peak of an emission spectrum of the first phosphorescent compound has a shorter wavelength than a peak of an emission spectrum of the second phosphorescent compound, and where the difference between the energy of a peak in an emission spectrum of the exciplex and the energy of a peak in an absorption band on the longest wavelength side in an absorption spectrum of the first phosphorescent compound is 0.2 eV or less.

The application discloses a kind of perfect cutoff absorber of metasurface based on nano round structure, adopt nanometer cylinder and ring array grown on silicon dioxide, two groups of ring structure are respectively selected using dielectric material gallium arsenide and silicon.Optimizing structure parameter, wavelength from ultraviolet to mid-infrared, 0.913 average absorption is realized in absorption band 100-710nm, and average absorption is only 0.02 in non-absorption band 1260nm-20μm wave band.ER is 9.6dB, ED is 0.81, and CS is 0.0015nm ‑1 The perfect cutoff absorber provided by the application has exactly this spectral selectivity, which provides an effective method for designing ideal solar heat absorber, which has important application in the field of renewable energy, such as solar thermal photovoltaic and solar thermal energy application.

The invention belongs to the field of blood glucose detection, and relates to a high-sensitivity blood glucose noninvasive detection method and system based on polarized terahertz photoacoustic, which combines the advantages of terahertz wave band detection and photoacoustic detection, fully utilizes the chiral characteristics of glucose molecules, and adopts polarized terahertz photoacoustic to detect the blood glucose concentration. Polarization optical rotation change information is extracted through the time domain photoacoustic signal; by selecting the characteristic absorption wave band of glucose and utilizing the difference between glucose and other blood components in chiral characteristics, the influence of water and other high-concentration ions on terahertz signals is remarkably reduced, so that the selectivity and the anti-interference capability of blood glucose detection are effectively improved; terahertz non-ionizing radiation is adopted as an excitation source, no ionizing injury risk is caused to a human body, and the device is suitable for long-term repeated detection and is expected to be popularized and applied in wearable or bedside monitoring equipment.

The invention discloses an in-situ ultraviolet hot-wet flue gas monitoring device, relates to the technical field of flue gas monitoring, and solves the problem that the original spectral analysis mode is not thorough due to the fact that characteristic analysis is not carried out aiming at an absorption peak and the characteristics are prominent. By combining length screening of the front characteristic wave band and the rear characteristic wave band of the absorption wave band, abnormal fluctuation caused by real absorption peaks of gas molecules, dust scattering and external interference can be effectively distinguished; when dust exists in flue gas, a trend peak can be identified as non-gas absorption interference through a verification value Ji after temperature regulation, a temperature verification interval is generated in real time through a temperature regulation and control end, the flue gas temperature is gradually regulated, characteristic absorption changes of gas molecules at different temperatures can be dynamically captured, absorption spectral line deviation caused by temperature fluctuation is eliminated, and the smoke quality is improved. And the amplitude error of the absorption peak is reduced to be within + / -5%.

The invention provides a hydrocarbon pollution detection method and device by coupling spectrum subtraction and characteristic T detection, and belongs to the technical field of environmental monitoring. The method comprises the following steps: acquiring target near infrared spectrum data of a to-be-detected area, determining corresponding background near infrared spectrum data according to the ground feature type of the to-be-detected area, and determining the target near infrared spectrum data according to the background near infrared spectrum data; the background near infrared spectrum data is reference spectrum data which is the same ground object as the to-be-detected target and is not polluted by hydrocarbons; performing subtraction processing on the target near infrared spectrum data and the background near infrared spectrum data to generate a difference spectrum; selecting a hydrocarbon characteristic absorption wave band and a reference wave band, and carrying out independent sample T inspection on the spectral value of the difference spectrum in the hydrocarbon characteristic absorption wave band and the spectral value of the difference spectrum in the reference wave band; and determining a hydrocarbon pollution detection result of the to-be-detected area based on the detection result. According to the method, background interference is eliminated through spectrum subtraction, an objective judgment standard is established by utilizing T test, and the scientificity and applicability of hydrocarbon pollution detection are improved.

The invention discloses a cobalt ore prospecting method and system based on spectral absorption depth, and belongs to the new technical field of spectral prospecting methods and mineral product prediction. The method comprises the following steps: acquiring short-wave infrared hyperspectral data of a to-be-detected area to-be-selected research object through an image sensor and an intelligent sensing system, performing continuous spectrum removal processing, and extracting mechanism sensitive wave band absorption band depth parameters; constructing a cobalt ore spectrum diagnosis index based on the parameters, and performing inversion on the cobalt element enrichment intensity to form a continuous response field; introducing the response field into a space potential field model to carry out gradient analysis, and revealing enrichment abnormal space convergence characteristics; according to the method, multi-source response information is fused in combination with local space continuity constraints, intelligent identification, prediction, accurate positioning and quantitative exploration of cobalt mineralization abnormity under a complex geological background are realized, and the problem that a traditional remote sensing method is insufficient in ability of identifying concomitant class isomorphic hidden mineralization is solved; the method has the advantages of high recognition degree, accurate positioning prediction, accurate quantitative prediction, wide applicability and the like.

Concentrations of individual hydrocarbons in a gas mixture are determined by measuring absorbance of mid-infrared radiation at specific wavelengths. Computation enables determination of concentrations of individual hydrocarbons despite overlaps of absorption bands.

The invention relates to a pyroelectric anti-interference detection method and a pyroelectric anti-interference detection device for characteristic decomposition products of mixed gas, and belongs to the field of insulating gas detection. Comprising the following steps: feeding sample gas into a chromatographic tower through carrier gas; the first product gas flows into a detection cavity through a buffer tank, the first concentration of the first product gas is obtained through carrier gas flushing, the second concentration of the first product gas is obtained through vacuumizing the detection cavity, and the third concentration of the first product gas is obtained through further carrier gas flushing; similarly, first to third concentrations of the second product gas and the third product gas are obtained; and respectively obtaining the final concentrations based on the first to third concentrations of the product gases. According to the method, different characteristic product gases are output to corresponding buffer tanks at different time intervals through chromatography, then sample gas is conveyed through carrier gas, and detection is performed through corresponding pyroelectric detectors, so that the problem that cross interference exists between the characteristic product gases and infrared absorption bands between the characteristic product gases and background gas when the characteristic product gases are directly detected by using a spectrum method is solved.

The present invention relates to a VPO catalyst in the form of a shaped body for the oxidation of hydrocarbons with molecular oxygen, in particular for the oxidation of butane to maleic anhydride with molecular oxygen, wherein the VPO catalyst contains 0.05 wt.-% to 7.0 wt.-% of Zn present as ZnO and which has a first absorption band in the transmission infrared spectrum with a maximum at 790 cm ‑1 to 810 cm ‑1 and possibly a second absorption band with a maximum at 820 cm ‑1 to 840 cm ‑1 and is characterized by the presence of only the first absorption band or by the intensity of the first absorption band being greater than the intensity of the second absorption band. The present invention also relates to a process for the preparation of the VPO catalyst of the present invention comprising the steps of a) preparing a catalyst precursor containing vanadyl hydrogen phosphate, b) forming the catalyst precursor into a shaped body, c) activating the shaped body to form the VPO phase, characterized in that after step a) ZnO is mixed with the catalyst precursor.

The invention belongs to the technical field of electrochemical recognition, and particularly relates to an electrochemical modified electrode for light-enhanced chiral recognition as well as preparation and application of the electrochemical modified electrode. In order to improve the sensitivity of electrochemical chiral recognition and recognizable molecule types, tetrabutyl titanate is used as a raw material, a photonic crystal with a TiO2 inverse opal structure is prepared on a polystyrene opal template, R-type or S-type 1, 1 '-co-2-naphthol chiral modification molecules are modified on the inverse opal structure, and the photonic crystal with the TiO2 inverse opal structure is obtained. And preparing the light-enhanced chiral recognition electrochemical modified electrode. The electrochemical modified electrode has a recognition effect on aromatic chiral molecules and aliphatic chiral molecules, and the recognition effect on the chiral molecules is enhanced under wavelength illumination of an absorption sideband of the photonic crystal.

This disclosure provides a quantum storage device for the field of quantum information technology, comprising: a light generation unit for generating pump light required for an integrable storage unit, and for preparing polarized qubit photons to be stored, and outputting the pump light and polarized qubit photons to the integrable storage unit; an electrical generation unit for generating electrical pulse signals required for the integrable storage unit, and outputting the electrical pulse signals to the integrable storage unit; an integrable storage unit, fabricated on a rare-earth ion-doped crystal, for preparing a specific absorption band using pump light according to a specified storage scheme, and for realizing on-demand reading of polarized qubit photons according to the electrical pulse signals; and a polarization detection unit for detecting the polarization state of the photon echo generated by the stored polarized qubit photons.

The invention discloses a fluorescence lifetime measuring device and method for a rare earth material. The device comprises an optical flat plate, an adjustable sample table, an optical fiber tail end focuser, an optical fiber tail end recoverer, a laser, a signal generator, an oscilloscope and a photoelectric detector. The device has the advantages that accurate focusing of exciting light and efficient collection of fluorescence can be achieved, and signal loss is reduced; interference of front and back excitation signals is avoided; the whole fluorescence attenuation process can be accurately captured, and the measurement error is small. The structure is designed in a modular mode, and all parts are convenient to install and adjust; the measurement method has clear steps. The output wavelength of the laser can be flexibly replaced according to the characteristic absorption band of a material to be measured, the wavelength response range of the photoelectric detector covers the characteristic fluorescence wavelength of a mainstream rare earth material, and the photoelectric detector can be adapted to measurement of rare earth materials with nanosecond-level to millisecond-level fluorescence lifetime, including various samples such as rare earth simple substances, rare earth oxides, rare earth doped fluorescent powder and the like. The measurement process does not need a complex data analysis algorithm, and is suitable for rapid detection of batch samples.

This invention provides a method for determining peak temperature and duration based on the blue shift of the absorption band edge of silicon carbide under neutron irradiation. The method includes the following steps: S1, selecting and processing a silicon carbide crystal, specifically including irradiation, slicing, annealing, and polishing; S2, determining the absorption band edge of the silicon carbide; S3, determining the relationship between the annealing temperature and the absorption band edge; S4, establishing a duration evaluation model; S5, measuring the peak temperature and the duration of the peak temperature using the silicon carbide crystal. This invention utilizes the blue shift of the absorption band edge to evaluate the peak temperature and its duration, filling the gap in existing technologies that cannot measure the duration of peak temperature. Furthermore, the temperature sensing crystal exhibits stable physicochemical properties, is not prone to chemical reactions at high temperatures, has a stable phase, and provides accurate measurement results, making it suitable for temperature testing in various high-temperature scenarios.

The application discloses a kind of geological sample component identification and abnormal detection system based on machine learning, it is related to geological sample component identification and detection technical field, first by the ratio of Compton and Rayleigh scattering intensity calculated by ray fluorescence energy spectrum, obtain effective atomic number and its uncertainty;Again, the continuum of short-wave infrared spectrum is removed, the depth of aluminum hydroxyl absorption band and band shape asymmetry are extracted, and the slope is used to represent the granularity, and the monotone spline is trained to obtain the clay proportion estimation;According to the end member set and atomic number table, the theoretical atomic number and uncertainty are obtained, and the measurement side is integrated into a unified scale to obtain the cross-modal inconsistency index.The state variable and the index are used as the target to adaptively optimize the collection and retest, and the consistency constraint is executed to solve the mixture and abnormality determination.The application can carry out high-precision identification and abnormality determination under complex working conditions.

The invention provides a large-size monodisperse mid-infrared absorption PbSe quantum dot and a preparation method thereof, the mid-infrared absorption specifically means that an absorption wave band covers a mid-infrared short wave interval of 2500-3300 nm, the quantum dot comprises a PbSe core and an in-situ coated PbS shell layer, a passivation layer is arranged outside the PbS shell layer, the particle size is 6-15 nm, and the relative standard deviation RSD is less than or equal to 5%. According to the preparation method, a differential injection technology is adopted, controllable nucleation is realized by rapidly injecting a precursor, then the precursor is slowly injected to complete crystal growth, and the size and monodispersity of the quantum dots are accurately regulated and controlled; then, a shell passivation precursor solution is slowly injected, a PbS shell is formed on the surface of the PbSe quantum dot in situ, a semi-in-situ passivator is injected at low temperature for surface passivation, and synthesis-passivation synergistically improves the stability of the quantum dot and the solubility of the quantum dot in a non-polar solvent.

A system and a method for spectroscopic sensing are provided for chemical and molecular species detections and trace concentration measurements as a standalone unit. The system may include a laser module configured for producing a laser beam capable of creating a plasma plume of a sample, the laser module comprising a Nd:YAG rod and diode lasers that are placed radially surrounding the Nd:YAG rod, wherein the diode lasers are configured to generate light having a spectral band width that overlaps absorption bands of Nd; a detector module configured for identifying elemental and trace chemicals from the plasma plume; and a computing module configured to acquire, store, and / or output data from the detector module. The disclosed system may be tightly sealed in a metal housing suitable for field applications in harsh environments for long durations, such as in subsurface conditions, in a high pressure and high temperature, or underwater.

The invention discloses dynamic noninvasive blood glucose monitoring equipment based on fusion of multi-wavelength PPG and body temperature sensing, and relates to the technical field of noninvasive blood glucose monitoring, the equipment comprises an equipment shell, and a multi-wavelength PPG signal acquisition module, a body temperature sensing module, a signal processing module and a power management module which are arranged on the equipment shell, the multi-wavelength PPG signal acquisition module adopts at least three light sources with specific wavelengths which respectively correspond to characteristic absorption wavebands of an epidermal layer, a dermal papilla layer and a dermal reticular layer, and the layered blood volume contribution factor calculation unit quantifies contribution degrees of capillary networks of different skin layers to the total blood volume; a dynamic adaptive weight distribution unit dynamically distributes fusion weights for PPG signals of all wavelengths; the blood glucose calculation unit calculates the blood glucose concentration based on the fusion signal through a multi-branch CNN-BiLSTM mixed neural network, the equipment can overcome physiological interference such as body temperature fluctuation and movement, the precision and continuity of noninvasive blood glucose monitoring are improved, and the equipment is suitable for dynamic blood glucose monitoring of diabetic patients.

Provided is a light-emitting element which includes a light-emitting layer containing a phosphorescent compound, a first organic compound, and a second organic compound between a pair of electrodes. A combination of the first organic compound and the second organic compound forms an exciplex (excited complex). An emission spectrum of the exciplex overlaps with an absorption band located on the longest wavelength side of an absorption spectrum of the phosphorescent compound. A peak wavelength of the emission spectrum of the exciplex is longer than or equal to a peak wavelength of the absorption band located on the longest wavelength side of the absorption spectrum of the phosphorescent compound.

The present invention relates to the measurement of dissolved oxygen using optical radiation to induce luminescence, providing a method and apparatus for analyzing the optical measurement to determine whether the liquid includes dissolved oxygen, to determine a predicted concentration of dissolved oxygen in the liquid, and / or to determine additional or alternative characteristics related to dissolved oxygen in the liquid. A light source can be controlled to emit optical radiation into a container containing a liquid. The light source can be located outside the container, and the optical radiation includes, for example without limitation, radiation conforming to the dissolved oxygen absorption band. The optical radiation can be pulsed, or can be periodically intensity modulated. A light detector located outside the container but in optical communication with the interior of the container can produce an optical measurement for analysis.

Fluid is sampled from a subterranean formation with a downhole tool from inside a wellbore intersecting the formation. The fluid is analyzed by a spectrometer inside the downhole tool. A light source in the spectrometer is pressure tuned to compensate for a change in wavelength of the output light due to a temperature change in the wellbore, and overlap with a compound of interest or analyte absorption band. The light source is in a fluid filled chamber, and a piezoelectric stack is in a cylinder that has an open end connected to the chamber. The fluid and the light source are selectively pressurized by expanding the piezoelectric stack at frequencies ranging up to at least around 1000 hertz. When pressurized, the output light wavelength is shifted to a range that coincides with a spectral response of a particular compound or compounds. The piezoelectric stack expands in response to electricity.

This invention discloses a real-time oil water content monitoring system based on near-infrared optics, comprising: a light source module that generates near-infrared light containing the characteristic absorption band of water; an optical modulation module that modulates the near-infrared light to generate a measurement beam and a reference beam; a sensing probe module that guides the measurement beam to the oil to be tested and collects the emitted beam after being acted upon by the oil; a photoelectric detection module that converts the emitted beam into a first electrical signal; a reference compensation module that receives the reference beam and generates a second electrical signal; a signal processing and calculation module that compensates the first electrical signal based on the second electrical signal and calculates the water content value based on the compensated signal; and an automatic calibration module that periodically introduces a standard sample into the measurement optical path of the sensing probe module and updates the compensation parameters or calculation model of the signal processing and calculation module based on the measurement results. This invention improves the repeatability and stability of online oil water detection, meeting the requirements for long-term reliable operation.

This invention provides a quantum storage device and a quantum storage method based on an optical resonant cavity. The quantum storage device includes: a light generation module that emits pump light and an optical signal; an electrical pulse generation module that generates an electrical pulse signal corresponding to the optical signal according to a preset storage method; the storage module includes a rare-earth-doped crystal, wherein a first reflective film on a first surface and a second reflective film on a second surface of the rare-earth-doped crystal constitute an optical resonant cavity, with the first and second surfaces forming a preset angle to change the resonant frequency of the optical resonant cavity; an optical waveguide array disposed inside a third surface of the rare-earth-doped crystal; an electrical waveguide array disposed on the third surface and electrically connected to the electrical pulse generation module, and changing the absorption band structure of rare-earth ions through the electrical pulse signal; the optical signal is coupled into the optical resonant cavity through the optical waveguide array, interacts with rare-earth ions within the optical resonant cavity, and excites the population of rare-earth ions to the upper optical energy level to store the optical signal.

The invention relates to a Fraunhofer spectral line benchmark-based generation and calibration method and system and a medium, and the method comprises the steps: measuring direct solar radiation spectrums at different solar zenith angles through a foundation spectrum instrument, and calculating the atmosphere quality of each spectrum measurement moment in each direct solar radiation spectrum; calculating solar spectral irradiance at the top of the earth atmosphere; selecting a non-absorption wave band which is not interfered by the atmosphere according to the atmosphere transmittance; and searching a Fraunhofer line in a non-absorption wave band, and carrying out spectrum calibration on a foundation spectrum instrument. According to the invention, the calibration does not need a laboratory standard lamp, and the problems of standard lamp attenuation and transmission errors are avoided; according to the method, areas which are not affected by the atmosphere in the spectrum can be distinguished and utilized, the method is not affected by the atmosphere, the method has good precision and long-term stability, the Fraunhofer line area AM0 spectrum extrapolation precision is improved, and the foundation spectrum instrument is calibrated by using the stable Fraunhofer line.