114results about How to "High measurement sensitivity" patented technology

The embodiment of the invention provides a differential Hall current sensor and a manufacturing method thereof, and belongs to the technical field of semiconductors. The differential Hall current sensor comprises a current bar; the insulating layer is bonded on the upper surface of the current bar; the at least two Hall elements are symmetrically arranged on the two sides of the upper surface of the insulating layer in the current direction; and the at least one deflection magnetism gathering block is attached to the magnetic induction surfaces of the at least two Hall elements and is used for deflecting a magnetic field component of the current magnetic field in the direction parallel to the magnetic induction surfaces of the Hall elements into a magnetic field component in the direction perpendicular to the magnetic induction surfaces of the Hall elements. According to the differential Hall current sensor, the current magnetic field is gathered through the deflection magnetism gathering block to form a conduction magnetic circuit, the directions of the magnetic field components are changed, the Hall element obtains the magnetic field intensity formed by superposing the magnetic field components in the two directions, and the measurement sensitivity is improved.

The embodiment of the invention provides a differential Hall current sensor and a manufacturing method thereof, and belongs to the technical field of semiconductors. The differential Hall current sensor includes: a substrate; the magnet yoke is provided with a semi-enclosed structure formed by a bottom surface and two side surfaces positioned on the same side of the bottom surface, and the bottom surface is bonded on the substrate; the current bar is placed in the cavity of the semi-surrounding structure and allows two end parts of the current bar to extend out of the semi-surrounding structure; the insulating layer is arranged on the upper surface of the current bar and located in the cavity; the at least two Hall elements are symmetrically arranged on the two sides of the upper surface of the insulating layer in the current direction; the at least two groups of magnetism gathering blocks are attached to the magnetic induction surfaces of the at least two Hall elements; at least two groups of magnetism gathering blocks and the magnet yoke form a conducting magnetic circuit, and the magnetic field component of the current magnetic field in the parallel direction of the magnetic induction surface is deflected into the magnetic field component in the vertical direction. According to the differential Hall current sensor, the Hall perceptible magnetic field intensity is enhanced through the conduction magnetic circuit of the gathered current magnetic field, and the measurement sensitivity is improved.

The invention discloses a Rydberg atom microwave measurement sensitivity improving method based on atom velocity selection, and relates to the field of Rydberg atom microwave measurement, and the method comprises the steps: moving the frequency of probe light to an energy level resonance transition position of cesium atoms from a ground state to an excited state, scanning the frequency of the coupled light within a Rydberg state energy level preset range, and observing an EIT signal; the frequency of the detection light is changed, the detuning amount of the detection light is selected to enable the EIT signal to reach the maximum, and the frequency of the detection light is locked to the frequency corresponding to the maximum position of the EIT signal; meanwhile, a local oscillation field signal generator in the Rydberg atomic microwave sensitivity measurement device is turned on, and corresponding EIT-AT splitting is generated; the frequency of the coupling light is locked to the coupling light laser frequency corresponding to the lowest point of EIT-AT splitting, and the Rydberg atom microwave measurement sensitivity reaches the maximum. The cesium atom speed is screened and controlled, and the signal-to-noise ratio of the measurement signal is improved, so that the measurement sensitivity is improved.

According to the SERF inertial measurement device electron longitudinal polarizability online measurement and closed-loop method, pumping light can be modulated through an electro-optical modulator to be rapidly switched between a left-hand circular polarization state and a right-hand circular polarization state, the electron spinning direction is overturned accordingly, and the longitudinal polarizability is changed accordingly. The light absorption of the pumping light changes along with the change of the electron spinning longitudinal polarizability, so that the change of the light intensity of the pumping light out of the cylinder reflects the change condition of the electron longitudinal polarizability. And the peak value of the light intensity of the pumping light out of the cylinder under the pulse modulation frequency is demodulated through the lock-in amplifier, so that the on-line measurement of the electron longitudinal polarizability of the SERF inertial measurement device is realized. The light intensity of pumping light entering a cylinder is adjusted by controlling the phase delay amount of the liquid crystal phase delayer LCVR, and the peak voltage of the light intensity of pumping light exiting the cylinder obtained by demodulation of the lock-in amplifier is controlled to remain unchanged, so that the real-time in-situ closed-loop control of the electron longitudinal polarizability of the SERF inertial measurement device is realized.

The invention discloses a laser triangular displacement measuring method and device adopting a multi-view metasurface. Firstly, a transmitting mirror group, a receiving mirror group and an optical filter in a traditional laser triangular displacement sensor are integrated into an integrated multi-view metasurface module based on the metasurface technology, and the module can simultaneously achieve the effects of collimation of emergent laser, imaging of scattered light spots on a target measured object and filtering of stray light of non-working wavelength in the environment; the system has extremely high function integration level, and meanwhile, the complexity of the system is also reduced. A target measured object is scanned by building a displacement calibration experiment platform, the mapping relation between the displacement of the target measured object and the position of an equivalent light spot is obtained, and laser triangular displacement measurement is achieved. The laser triangular displacement measuring device is simple in system composition, easy to assemble and compact and small in whole, can be easily integrated on a moving device to achieve high-precision scanning, and is not prone to mechanical interference.

The invention belongs to the related technical field of flexible electronic devices, and discloses a flexible stretchable electronic device and a preparation method and application thereof based on laser surface treatment.The method comprises the following steps that firstly, arrangement patterns of micro-grooves are set according to performance requirements of the flexible stretchable electronic device to be prepared; secondly, the surface of the substrate is ablated through picosecond ultraviolet laser to form the micro-gullies, and the geometrical characteristics of the micro-gullies are adjusted by adjusting parameters of the picosecond ultraviolet laser; step 3, sputtering a functional layer on the surface of the micro-gully; and 4, macroscopically patterning the functional layer to obtain the flexible stretchable electronic device. The method is simple in technological process, suitable for various elastic-plastic substrates, suitable for various functional materials and convenient to use in a large area, can be combined with other macrostructure / material design, and meanwhile is suitable for further enhancing performance.

The invention belongs to the technical field of fluorescent protein detection, and relates to a single particle counting fluorescent protein detection method based on solid-phase signal amplification, which comprises the following steps: S1, preparing a magnetic bead immune complex; s2, amplifying in-situ fluorescence signals on the surfaces of the magnetic beads; s3, uniformly dispersing the magnetic bead immune complex; s4, calculating an AMB value corresponding to the magnetic bead immune complex loaded with the signal molecules; s5, changing the concentration of the antigen protein to obtain AMB values corresponding to different concentrations, and obtaining a standard regression equation; and S6, taking a to-be-detected antigen protein solution to obtain an AMB value, and substituting the AMB value into the standard regression equation to obtain the concentration of the to-be-detected antigen protein. The method provided by the invention realizes signal amplification of a solid phase interface, simplifies the detection process, improves the detection sensitivity, reduces the detection cost, and realizes ultra-sensitive detection of the antigen protein.

The invention relates to a broadband electromagnetic current transformer suitable for a 10kV power distribution network intelligent fusion complete switch and a performance detection method of the broadband electromagnetic current transformer. The broadband electromagnetic current transformer comprises a primary side current transformer and a secondary side current transformer, the primary side current transformer comprises a shielding shell, an outgoing line and a magnetic core arranged in the shielding shell; the magnetic core comprises a framework, a metal ring belt and an enameled wire; an annular groove is formed in the shielding shell, and an annular cutting gap communicated with the annular groove is formed in the circumferential wall of the inner ring of the shielding shell; the secondary side current transformer comprises a first reference layer, a second signal layer, a third signal layer and a fourth reference layer; high-frequency transient information generated in the fault process can be effectively collected, the bandwidth range, the measurement precision and the sensitivity of the transformer are improved, the secondary side current transformer adopts a four-layer PCB design, and double constraints of high-frequency signal transmission on a winding in a traditional Rogowski coil are overcome. According to the performance detection method, any field actual waveform can be simulated and output for sensor performance test so as to control the factory performance of a switch.

The invention belongs to but not limited to the technical field of surface analysis, and particularly relates to a dielectric material surface charge density and surface potential measurement method and device, and the method comprises the steps: S1, enabling a to-be-measured dielectric material to be subjected to an electrostatic force F through an external electric field, and transmitting the electrostatic force F to a compound pendulum frame through a sample support; s2, the pendulum frame of the compound pendulum rotates by an angle delta theta under the action of the electrostatic force F; s3, the angle delta theta is equal to the displacement x of a middle pole plate of the bottom capacitance displacement detection system; s4, the differential capacitance delta C of the two capacitors of the capacitance displacement detection system is in direct proportion to the rotation angle delta theta; and S5, after modulation and demodulation of the capacitance sensing circuit, the delta C is converted into a voltage output signal VO.

The invention discloses a dispersion optical microcavity angular velocity detection structure based on compression light field enhancement. The dispersion optical microcavity angular velocity detection structure is composed of a compression light source, a coherent light source, an optical beam splitter, a straight waveguide, two annular optical resonant cavities and a photoelectric detector. The two annular resonant cavities form a coupled resonant cavity system, the dispersion in the cavities can be regulated to be normal dispersion or abnormal dispersion by regulating the reflection coefficient of the coupler between the two rings, and whether a compressed light field is coupled into the system or not can be regulated by operating the opening and closing of the optical baffle. Light fields emitted by the compression light source and the coherent light source are coupled by the optical beam splitter and then enter the straight waveguide as input light signals, and then enter the coupling resonant cavity through the two couplers to be transmitted, and then output signal light enters the photoelectric detector through the straight waveguide to be detected. The standard quantum limit sensitivity of the system to angular velocity sensing can be remarkably broken through by a method of coupling the compressed light field in the dispersive optical resonant cavity.

The present invention relates to the field of optical detection, and in particular to a spectral confocal displacement measurement system based on heterodyne interference and a measurement method thereof, wherein a tunable laser emits monochromatic light of different wavelengths, which is divided into two beams of illumination light by a first beam splitter, one beam of illumination light is incident on a beam combiner after being modulated by a first acousto-optic frequency shifter, and the other beam of illumination light is incident on a beam combiner after being modulated by a second acousto-optic frequency shifter, and the two beams of illumination light after being modulated are combined by the beam combiner and incident on a sample through transmission of a second beam splitter and focusing of an objective lens to generate heterodyne interference, forming two light spots with overlapping areas on the sample; the sample reflects the incident light beam, and the reflected light beam is then sequentially transmitted by an objective lens, reflected by a second beam splitter, focused by a third focusing lens, and suppressed by stray light of a third pinhole, and received by a photodetector, and converted into an electrical signal and transmitted to a processor. The present invention can realize the combination of heterodyne interference technology and spectral confocal microscopy technology, and improve the measurement resolution.

This invention discloses an insulating encapsulation structure and connection method for a probe temperature sensor, relating to the field of temperature sensor technology. The insulating connection bracket has an outer insulating and thermally conductive protective layer, and contains insulating adhesive and a temperature-sensing component. The specific implementation is as follows: an insulating layer assembly, a built-in snap-fit ​​structure within the insulating connection bracket, and an eccentric cavity for housing the temperature-sensing component. A thermistor glass body is used as the insulator. In the insulation process, direct contact between the glass body and the inner wall of the bracket reduces one useless insulating layer. The cavity formed by the end of the insulating connection bracket and the insulating layer assembly houses the temperature-sensing component. The cavity contains a clearance structure for the thermistor pins and multiple layers of insulation between the pins and the conductive copper wires. A fluid insulating adhesive is used, and then the insulating connection is cured. Finally, the encapsulation is placed inside a metal shell containing insulating adhesive and cured, thus forming multiple layers of effective insulation and sufficient safe insulation thickness between the thermistor conductive pins and the metal shell.

The invention provides a digital heterodyne interference demodulation technology based on a chaotic signal enhancement array. An all-optical random code optical path module, a heterodyne interference optical path module, a sensing array module and a data processing module are included. The all-optical random code optical path module is composed of a polarization controller (PC), an electro-optical modulator (EOM), an erbium-doped optical fiber amplifier (EDFA), a highly nonlinear optical fiber (HNLF), a band-pass filter (BPF) and a first optical fiber coupler which are sequentially connected through optical fibers, wherein EOM electric control signals are connected through a chaotic entropy source. The heterodyne interference light path module is composed of a single-frequency laser, a second optical fiber coupler, an upper interference arm, a lower interference arm, an optical fiber circulator, an acoustic optical modulator (AOM) and a third optical fiber coupler; the sensor array module is composed of a plurality of optical fiber weak reflection points (FWR) and optical fiber sensors connected between the FWR and the FWR. The data processing module is composed of a photoelectric detector (PD), a plurality of delay units, a plurality of multipliers, a phase demodulator and a computer. The method has the advantages that on the basis of a traditional digital heterodyne interference demodulation method, a chaotic entropy source all-optical true random code is introduced to serve as a digital modulation signal, and the spatial resolution of a demodulation system can be improved to the magnitude of cm as high as 10 Gb / s; the infinite code length effect of the all-optical random code in the chaotic signal enhanced heterodyne interference breaks through the signal-to-noise ratio limit of the traditional digital enhanced heterodyne interference method.

The utility model relates to the technical field of coal slime water treatment, in particular to a coal slime water solid content detection device which comprises a supporting frame, and an ore pulp constant volume device is placed on the supporting frame. Lifting weighing parts are arranged at the bottom of the ore pulp constant volume container at intervals, and the weighing ends of the lifting weighing parts can jack the ore pulp constant volume container away from the supporting frame from bottom to top and weigh the ore pulp constant volume container. According to the utility model, the mass of solid matters in the slime water pulp can be accurately calculated, so that the accuracy of slime water pulp concentration calculation is improved.

The application aims to provide a biaxial anisotropic material dielectric constant temperature variation test system and method, and belongs to the technical field of microwave and millimeter wave test. The system innovatively designs a free space terminal short circuit test system, realizes the acquisition of S21 parameters of microwave materials under high temperature through symmetrically arranging two antennas, and inversely obtains electromagnetic parameters based on the S21 parameters. Meanwhile, the test system can rotate the sample and rotate the antenna by 90 degrees, so as to realize the extraction of electromagnetic parameters of isotropic materials and biaxial anisotropic materials under high temperature in a wide frequency band, and has the advantages of large test range, simple detection mode, high measurement precision and the like.

The present invention provides a detection system for early tumor screening and its application in the preparation of tumor antigen detection products, belonging to the technical field of early tumor screening. The present invention provides the application of a micro-pot array chip combined with micron-sized magnetic beads in the preparation of an ELISA detection product for early tumor screening. The present invention uses micron-sized hydrophilic micro-pots as reaction carriers for ELISA detection, and uses micron-sized magnetic beads to encapsulate capture antibodies used to capture tumor antigens. By limiting the fluorescent groups produced by a single enzyme-catalyzed substrate to an extremely small volume, a high local concentration of fluorescent product molecules is ensured to generate a sufficiently strong optical signal to be detected, thereby realizing the detection of extremely low concentrations of tumor antigens. At the same time, the present invention can reduce the amount of sample collection, such as the amount of blood collection, and the amount of serum required for detection can be achieved by drawing blood from the fingertips, greatly reducing the degree of trauma to the patient.

The invention discloses a micro-spray ionization device, comprising a sealed housing, a sample introduction mechanism, a spray needle, a high voltage connection mechanism and a reflection electron microscope; the sealed housing is sealed and connected to the inlet end of a mass spectrometer and a sealed cavity is formed inside the sealed housing, the sample introduction mechanism is sealed and installed in the sealed housing and one end is connected to a sample input pipeline; the spray needle is installed in the sample introduction mechanism and the angle between the spray needle and the center line of the inlet of the mass spectrometer is between 0 and 90 degrees, the distance between the needle tip of the spray needle and the inlet of the mass spectrometer is 2 to 30 mm, the high voltage connection mechanism is electrically connected to the spray needle and the power supply respectively; the reflection electron microscope is arranged in the sealed cavity and faces the inlet of the mass spectrometer, and the reflection electron microscope is electrically connected to an external adjustable power supply. The atomization efficiency of the micro-spray ionization device is greatly improved, and 100% ion collection can be achieved, and the measurement sensitivity is greatly improved, and it is particularly suitable for micro-sprays with a flow rate of less than 10 microliters / minute.

The application discloses a multi-signal detection device based on quantum entanglement and joint measurement, comprising a laser, an optical parametric amplifier group, a signal loading module group, a beam splitter network group and a balanced homodyne detection device group arranged in sequence along an optical path. The device adopts a modular optical structure design, and through the synergistic effect of compressed light source, entangled state preparation, interference measurement and joint detection, realizes the function of quantum enhanced measurement. The application also discloses a method for multi-signal detection by using the device, and through the introduction of quantum entanglement resources and the combination of joint measurement mechanism, the sensitivity of multi-parameter measurement is significantly improved. The measurement precision of multiple parameters to be estimated can all break through the standard quantum limit, and reach the quantum Cramer-Rao bound of the system; meanwhile, the estimation precision of each parameter presents good consistency.

The present invention provides an electrode and an electrode chip that can improve the measurement sensitivity and reproducibility of electrochemical measurements. The electrode chip (2) comprises: a metal layer (41) formed on an insulating substrate (21); a carbon layer (42) formed on the metal layer (41); and an upper bonding layer (44) formed between the upper surface of the metal layer (41) and the carbon layer (42). The upper bonding layer (44) is formed of silicon. The side surface of the metal layer (41) is covered by an insulating layer (25).

The invention provides a portable material elasticity modulus measuring instrument and a measuring method. The measuring instrument comprises an outer frame; an arch; the shell is arranged in the outer frame and is provided with a first end and a second end; the position of the first end relative to the outer frame is adjusted through a traction rope; the second end is fixed to a support, and the support is in contact and sliding connection with the inner side of the outer frame and is fixed to the inner side of the outer frame when the support is located at the bottom of the outer frame. A detection assembly; the strain sensor comprises a strain piece and a measuring piece, and the strain piece is arranged on the arch crown of the arch piece to collect the arch crown strain force of the arch piece; the measuring piece is electrically connected with the strain piece and displays a strain force value acquired by the strain piece; and the rotating assembly is connected with the arched piece so that the first end can rotate in the thickness direction of the outer frame. According to the method, the elasticity modulus of the material can be calculated according to different materials, and the strength grade of the to-be-tested material is calculated according to the relationship between the elasticity modulus of the different materials and the strength of the material.

The invention relates to the technical field of ship deflection measurement, in particular to a deflection measurement system and method for a semi-submersible barge and the semi-submersible barge, the deflection measurement system is long in service life and more stable in structure by adopting steel cylindrical measurement cylinders, meanwhile, the liquid level value of each measurement cylinder is detected in real time by adopting a magnetostrictive liquid level sensor, and the measurement accuracy is improved. The precision of the sensor is high, so that the measurement precision of the deflection measurement system is further improved; according to the deflection measurement method, liquid level parameters are measured, the method is more sensitive than pressure difference data measurement, and the measurement precision and sensitivity can be further improved; the semi-submersible barge adopts the deflection measuring system and the deflection measuring method, the service life is longer, the measuring precision and the sensitivity are higher, the measuring cylinder is limited to be arranged at the position close to the strong frame, the longitudinal bulkhead and / or the transverse bulkhead, the measuring cylinder is not prone to being influenced by deformation of the barge, the measuring precision is higher, and the measuring accuracy is higher. And the deflection deformation of the semi-submersible barge in the shipping process can be accurately obtained.

The application discloses a kind of high-sensitivity magnetic field detection device and method, device includes sequentially arranged in light propagation direction narrow line width tunable light source, polarized light formation module, first convex lens, second convex lens, Fabry-Perot cavity and detection calculation module, the Fabry-Perot cavity is equipped with the magneto-optical crystal that circled magnetic field coil, wherein, narrow line width tunable light source emits elliptically polarized signal light, polarized light formation module is formed into linearly polarized light of preset angle by signal light, Fabry-Perot cavity is formed with the linearly polarized light of resonance by injection, and linearly polarized light is shot from the cavity after being incident with two modes of light beam after magneto-optical crystal, detection calculation module includes connected detection unit and calculation unit, detection unit receives two modes of light beam, and calculation unit calculates the magnetic field applied to magneto-optical crystal according to the frequency difference of two modes.The application simple structure, simple operation, wide use, high sensitivity.

The present invention discloses a milling temperature measuring tool and a preparation method thereof, belonging to the technical field of cutting tool preparation. A milling temperature measuring tool comprises a tool cutting body and an annular temperature measuring module embedded in the tool cutting body, wherein the annular temperature measuring module is a thermosensitive ceramic, and the inner diameter of the annular temperature measuring module is 6 to 8 mm, the outer diameter is 10 to 12 mm, and the height is 3 to 5 mm. Compared with traditional milling tools, the milling temperature measuring tool of the present invention has a wide temperature measurement range and high sensitivity to temperature changes, and overcomes the problem that the preparation process of the thin film thermocouple sensor temperature measuring tool is complicated and difficult to mass produce.

The invention relates to the technical field of micro electro mechanical systems, in particular to an MEMS pressure sensor chip capable of working in an extreme environment and a manufacturing method of the MEMS pressure sensor chip. The pressure sensor comprises an SOI silicon-on-insulator substrate, a piezoresistive resistor, a middle silicon nitride insulation isolation layer, a through hole layer, an organic epoxy insulation packaging layer, a sensor film layer and a conductive material assembly used for connection. Four piezoresistive resistors are formed by ion implantation and are symmetrically distributed on the thin film layer to form a Wheatstone bridge structure. The sensor film layer is square, the size of the sensor film layer is smaller than that of the substrate, the sensor film layer is I-shaped, the thermal stress concentration effect is reduced, cracks or deformation is avoided, the sensor film layer and the substrate jointly form a vacuum cavity, and high structural stability is kept. The insulating packaging layer is connected with the through hole layer, and the through holes are connected with the insulating layer through the conductive material of the opening of the insulating layer. The sensor provided by the invention can keep higher measurement precision and sensitivity in an extreme temperature environment.

The invention discloses a strong pumping bilateral resonance modulation-demodulation magnetic sensitivity enhancement method of a quantum magnetic compass. The method comprises the following steps: constructing a quantum magnetic compass platform comprising a sensing unit and external optical and microelectronic devices; quantum state enhanced reading containing magnetic vector information is realized by using a pumping enhancement mode; a standard diamond is used, the thermal conductivity and the light transmission of the diamond are utilized, the initialization of a quantum state is realized by using near-saturation external pump light, the line width is narrowed, and the magnetic measurement sensitivity is improved; noise in the environment is filtered out in a modulation and demodulation mode, and high-robustness extraction of quantum information is achieved. By enhancing the laser pumping power, the emission speed of the solid-state quantum color center ensemble fluorescence photons is increased, the full width at half maximum of a magnetic resonance curve is compressed, and the measuring capacity of the solid-state quantum color center to a magnetic field is improved; accurate measurement of external magnetic field signals through the solid quantum color center in the diamond is realized.

The present application relates to shear stress detection technical field, especially to a kind of stress detection device, comprising: first mechanical arm, second mechanical arm, detection component and power component, its first mechanical arm and second mechanical arm are respectively with same rotational speed along opposite rotating directions movement, to the part to be measured is applied a pair of equal, opposite force moment, to twist the part to be measured;Detection component is used to detect the torque generated by the part to be measured twisted by first mechanical arm and second mechanical arm.This application is by first mechanical arm and second mechanical arm with same rotational speed, opposite direction to part exert torque load, while with the flexible detection band and the strain matrix on it that adhere to the surface of part, real-time acquisition and processing the multidimensional torsional stress generated by part surface in the process of twisting, realize the directional, real-time detection of torsional stress.

This invention provides an IGBT device. A temperature sensor is integrated on one side of the cell region within the IGBT device to monitor the device's actual temperature in real time. Multiple diodes are connected in series within the temperature sensor to amplify the temperature sensing signal, improving measurement accuracy and sensitivity, and enhancing the anti-interference capability of the temperature sensing. Each diode is located on the field oxide layer to achieve electrical isolation. Furthermore, the field oxide layer has a specific size to prevent high-voltage breakdown and enhance device reliability. Each diode also has an N-type doped region and a P-type doped region; the N-type and P-type doped regions are respectively connected to metal plugs for electrode leads. Furthermore, the metal plugs are of a specific size to reduce contact resistance and further enhance device performance.

The application discloses a device and method for measuring fluorescence quantum yield of two-dimensional transition metal chalcogenide compound material, and belongs to the technical field of optical measurement and material characterization. The method comprises the following steps: calibrating a system response function about wavelength; measuring the absorption rate of the two-dimensional transition metal chalcogenide compound material to incident laser; measuring the photoluminescence spectrum of the two-dimensional transition metal chalcogenide compound material; measuring the integral intensity of the diffuse reflection spectrum under the same condition by using a diffuse reflection mirror; and calculating the fluorescence quantum yield of the two-dimensional transition metal chalcogenide compound material according to the system response function, the absorption rate of the two-dimensional transition metal chalcogenide compound material to incident laser, the photoluminescence spectrum of the two-dimensional transition metal chalcogenide compound material and the integral intensity of the diffuse reflection spectrum. The fluorescence quantum yield of the two-dimensional transition metal chalcogenide compound material can be accurately measured, so that the quantitative, rapid and non-destructive characterization of the light-emitting efficiency of the two-dimensional transition metal chalcogenide compound material is realized.

The invention relates to the field of optical detection, in particular to a spectrum confocal displacement measurement system and method based on heterodyne interference, a tunable laser emits monochromatic light with different wavelengths, the monochromatic light is divided into two beams of illumination light through a first beam splitter, one beam of illumination light enters a beam combiner after being subjected to frequency modulation of a first acousto-optic frequency shifter, and the other beam of illumination light enters a second acousto-optic frequency shifter; the other beam of illumination light is subjected to frequency modulation of a second acousto-optic frequency shifter and then enters a beam combiner, the two beams of illumination light subjected to frequency modulation are combined by the beam combiner and then are subjected to transmission of a second beam splitter and focusing of an objective lens and then enter a sample to generate heterodyne interference, and two light spots with overlapped areas are formed on the sample; the sample reflects an incident light beam, and the reflected light beam is received by the photoelectric detector through transmission of the objective lens, reflection of the second beam splitter, focusing of the third focusing lens and stray light suppression of the third pinhole in sequence, and is converted into an electric signal to be transmitted to the processor. According to the invention, combination of a heterodyne interference technology and a spectrum confocal microscopy technology can be realized, and the measurement resolution is improved.

The present application proposes a wide-band phase object, a 4f optical nonlinear measurement system and a measurement method. The phase object uses two glass slides to overlap to produce a gap to meet the basic requirements for making a phase object, and is made into an ordinary phase object and an absorptive phase object, which is placed on a rotating platform. The thickness of the phase object is controlled by adjusting the rotation angle of the rotating platform to achieve the control of the phase of the phase object. When the phase produced by the phase object is an integer multiple of π / 2, complete interference bright or dark lines will appear on the central liquid film or film, and the nonlinear refraction phenomenon of the sample to be measured can be clearly observed, and the optimal sensitivity can be achieved at this time. Another use of fixing the phase object on the rotating platform is that the thickness of the phase object can be freely and accurately controlled. Under continuous wavelength waves, the appropriate thickness at the corresponding wavelength can be found by adjusting the rotation angle of the rotating platform to achieve the optimal measurement sensitivity.