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32 results about "Electron resonance" patented technology

Method for measuring atomic transverse relaxation time based on electron resonance phase frequency analysis

InactiveCN106597338ASuppression of the effects of common coefficient fluctuationsExact transverse relaxation timeMeasurements using electron paramagnetic resonanceAnalysis using electron paramagnetic resonanaceFrequency spectrumTransverse magnetic field
The invention discloses a method for measuring atomic transverse relaxation time based on an electron resonance phase frequency analysis. In a strong-background magnetic field with almost neglected residual magnetization in a magnetic shielding barrel, a swept-frequency signal that has a bandwidth covering a resonance curve and has an amplitude enabling the resonance curve to have a clear curve under low polarizability is applied in a horizontal direction; an optical swing angle signal of a magnetometer is detected and a spectral analysis is carried out on an outputted signal in a polar coordinate system to obtain a phase frequency response function of the magnetometer; the phase frequency response function is fitted to a corresponding theoretical phase frequency curve of the magnetometer to obtain atomic spinning transverse relaxation time. Because the phase angle is a result obtained by quotient processing of a spinning transverse component, the influence of common coefficient fluctuation is suppressed, so that the phase frequency signal expression is more stable by being compared with amplitude-frequency signal expression. Besides, the theoretical phase frequency curve is not affected by the magnetic induction intensity of the transverse magnetic field and the atomic spinning longitudinal relaxation time, so that complexity of data processing can be reduced. Moreover, a lorenz curve widening risk caused by the transverse magnetic field can be eliminated.
Owner:BEIHANG UNIV

Closed-loop control method for nuclear-spin self-compensation point of SERF atomic-spin top

ActiveCN109373989AHigh precisionImprove Scale Factor LinearityTurn-sensitive devicesGyroscopeClosed loop
The invention discloses a closed-loop control method for a nuclear-spin self-compensation point of an SERF atomic-spin top. According to the method, an amplitude-frequency characteristic curve and a phase-frequency characteristic which respond to an alternating current magnetic field of a gyroscope are firstly measured, the resonant frequency and the resonant frequency phase position correspondingto an alkali metal electron resonance peak are found out, a longitudinal compensation offset magnetic field is dynamically adjusted in a frequency closed-loop manner or a phase position closed-loop manner, and the alkali metal electron resonance peak is controlled to be unchanged in real time, so that the longitudinal magnetic field sensed by alkali metal electrons is constant, and the closed-loop control of the nuclear-spin self-compensation point is realized. According to the method, the influence caused by the fluctuation of a longitudinal environmental magnetic field and an inert gas nucleon longitudinal magnetic field to the alkali metal electrons can be reduced, signal fluctuation and coupling errors during the measurement of double-shaft angular rate of the SERF atomic-spin top arerestrained, and the linearity degrees of precision and calibration factors of the gyroscope are increased.
Owner:BEIHANG UNIV

Method for measuring residual magnetism in shielding barrel based on in-situ magnetometer

The invention discloses a method for measuring residual magnetism in a shielding barrel based on an in-situ magnetometer, and is suitable for testing the residual magnetism in the shielding barrel of an atomic sensor. The method comprises the steps of firstly, applying a static magnetic field, a modulation magnetic field, pumping light and detection light to enable an atom magnetometer to work in a magnetic resonance state; demodulating a magnetometer signal, extracting a direct-current component of the magnetometer signal by using a low-pass filter to obtain the residual magnetism in the transverse direction, namely the direction perpendicular to a static magnetic field, and applying a direct-current compensation magnetic field in the transverse direction to compensate the residual magnetism to zero; and carrying out residual magnetism measurement and compensation under different detection light intensities, so that it is found that the output value of a compensation magnetic field linearly changes along with the detection light intensities, and the intercept of a straight line on a longitudinal axis is the value of the transverse actual residual magnetism after light frequency shift is eliminated. The electronic resonance frequency is measured by using a magnetic field frequency sweeping method, and the change of the resonance frequency after the static magnetic field direction and the left and right rotation of the pumping light are turned at the same time is measured, and the longitudinal actual residual magnetism can be obtained by dividing the change by two times of the alkali metal gyromagnetic ratio. According to the present invention, an external sensor is not needed, and the design of the atom sensor is greatly facilitated.
Owner:BEIHANG UNIV

Magnetic field sensor based on photonic crystal fiber and optical grating and measurement method

The invention provides a magnetic field sensor based on a photonic crystal fiber and an optical grating and a measurement method. The magnetic field sensor consists of the D-shaped photonic crystal fiber, a nanogold layer, the nano optical grating and magnetofluid film, wherein the nanogold layer is coupled to the axially extending smooth surface of the D-shaped photonic crystal fiber, the nano optical grating is inscribed on the nanogold layer, the magnetofluid film covers the nano optical grating, and the structures of the D-shaped photonic crystal fiber and the nano optical grating improvethe intensity of evanescent waves. The refractive index of a magnetofluid changes with the change of magnetic field intensity, free electrons on the surface of the nanogold layer produce absorbing peaks through resonance, their resonant wavelengths offset, magnetic field sensing measurement is achieved by observing the offset process of the resonant wavelengths, a surface plasmon resonance principle is adopted, and the problem of poor linearity of an optical fiber magnetic field sensor prepared by utilizing magnetofluid refraction index characteristics is solved only analyzing the resonance relation of the magnetofluid and the nanogold layer and the more obvious linear relation between the absorbing peaks and magnetic fields.
Owner:SHENYANG JIANZHU UNIVERSITY

Method for improving photo-thermal excitation micro-cantilever beam vibration energy conversion efficiency by using local plasmon structure

A method for improving photo-thermal excitation micro-cantilever beam vibration energy conversion efficiency by using a local plasmon structure comprises steps of: preparing the local plasmon structure on the micro-cantilever beam and acquiring a vibration signal emitted by photo-excited micro-cantilever beam vibration. The metal nanoparticles convert the absorbed light energy into the kinetic energy of electron resonance, and further convert the kinetic energy into the vibration energy of the lattices by means of the scattering of the lattices on electrons. The metal nanoparticles can also increase the effective mass of the micro-cantilever beam so as to increase the quality factor of the micro-cantilever beam, thereby improving the detection accuracy and the resolution of a micro-cantilever beam sensor. In addition, the micro-cantilever beam combining the plasmon can also be used as an optical power meter with excellent performance to achieve a limit of detection up to pm/nW. The method solves the low vibration efficiency of the photo-excited micro-cantilever beam, is simple and convenient, and has a great practical value to the development and application of the photo-excited micro-cantilever beam vibration.
Owner:SHANDONG UNIV

Microwave ultraviolet lamp based on electron cyclotron resonance principle

InactiveCN104576296ASolve the problem of poor UV curing effectImprove luminous efficiencyGas discharge lamp detailsResonant cavityStart time
The invention relates to a microwave ultraviolet lamp based on an electron cyclotron resonance principle, and belongs to the field of microwave electrodeless lightening technology. The microwave ultraviolet lamp based on the electron cyclotron resonance principle is used for solving the problems in the prior art that the starting time of the middle portion of a microwave ultraviolet lamp is long and the luminous efficiency is low. According to the microwave ultraviolet lamp based on the electron cyclotron resonance principle, a modulator tube ia arranged on a microwave resonant cavity which is formed by a reflector and a metal shielding net, a permanent magnet is arranged on the outside surface of the reflector, and the permanent magnet and the modulator tube are arranged on the same straight line. A feed inlet is formed in the reflector, the microwave emanated from a magnetron enters the reflector through an incentive cavity of the magnetron and the feed inlet, a constant magnetic field is generated around the modulator tube by the permanent magnet when the microwave enters the reflector, the coupling of the constant magnetic field and the microwave entering the reflector enables the middle portion inside the modulator tube to generate an electronic resonant acceleration, so that the middle portion of the modulator tube can be started in a relatively short time, and the problems that the starting time of the middle portion of the microwave ultraviolet lamp is long and the luminous efficiency is low and the like are solved. The microwave ultraviolet lamp based on the electron cyclotron resonance principle can be utilized in the fields of the ultraviolet sterilization, the fluorescence excitation, and the relevant ultraviolet curing and the like.
Owner:HARBIN UNIV OF SCI & TECH +1

D-type double-core photonic crystal fiber double-parameter plasma sensor

The invention provides a D-type double-core photonic crystal fiber double-parameter plasma sensor. An optical fiber SPR sensor comprises a D-type photonic crystal optical fiber with an open annular channel and a curved side wall; a fiber core, an air hole, a metal film, a TiO2 layer, a temperature-sensitive medium, a liquid analyte and a perfect matching layer are comprised. The photonic crystal fiber is formed by arranging a fiber core of the photonic crystal fiber and air holes with the same size, a substrate material is quartz, one air hole in the middle of the fiber core is filled with a temperature-sensitive medium PDMS, and the outer ring thereof is coated with a metal film; and the metal film and the TiO2 layer are arranged on an open annular plane. The refractive index of the temperature-sensitive medium changes along with the change of the temperature, meanwhile, free electrons on the surface of a nanogold layer resonate to generate an absorption peak, the resonant wavelength of the absorption peak deviates, the temperature sensing measurement is realized by observing the deviation process of the resonant wavelength, and the surface plasmon resonance principle is adopted. The sensor is high in sensitivity, wide in detection range and high in corrosion resistance.
Owner:GUILIN UNIV OF ELECTRONIC TECH

A method for measuring residual magnetism in shielded barrels based on in-situ magnetometer

A method for measuring residual magnetism in shielded barrels based on an in-situ magnetometer is suitable for testing the residual magnetism in shielded barrels of atomic sensors. First, apply a static magnetic field, modulate the magnetic field, pump light, and detect light to make the atomic magnetometer work in the magnetic resonance state; demodulate the magnetometer signal, extract its DC component with a low-pass filter, and obtain the horizontal or vertical static For the remanence in the magnetic field direction, apply a DC compensation magnetic field in the transverse direction to compensate the remanence to zero; carry out the remanence measurement and compensation under different detection light intensities, and find that the output value of the compensation magnetic field changes linearly with the detection light intensity, and the straight line is on the vertical axis. The intercept above is the value of the actual lateral remanence after excluding the optical frequency shift; the electronic resonance frequency is measured by the method of magnetic field sweep, and the change of the resonance frequency after the direction of the static magnetic field and the left-right rotation of the pump light are simultaneously reversed, divided by Twice the alkali metal gyromagnetic ratio can get the actual longitudinal remanence. The invention does not need to use an external sensor, which greatly facilitates the design of the atomic sensor.
Owner:BEIHANG UNIV
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