18 results about "Absorbed power" patented technology

The invention discloses an infrared film absorptivity prediction method and system based on machine learning, and relates to the technical field of optical film design and performance prediction.The infrared film absorptivity prediction method comprises the following steps that feature data of a to-be-measured film material and incident light are obtained, electromagnetic field distribution and local absorption power density are output, and according to power integration and boundary conditions, an infrared film absorptivity prediction result is obtained; obtaining initial absorptivity distribution; performing modal analysis on the initial absorptivity distribution, constructing a low-dimensional absorptivity response model, and outputting absorptivity response data after dimension reduction; constructing a physical constraint neural network by taking energy conservation and Fresnel boundary conditions as constraints; on the basis of a physical constraint neural network, absorptivity prediction is carried out on the infrared thin film under different conditions, thin film structure data are optimized through a multi-objective optimization algorithm, and an optimal structure parameter combination of the infrared thin film is obtained; according to the invention, through multi-physics field modeling and the physical constraint neural network, the problems of low infrared film absorptivity prediction precision and poor optimization efficiency are solved.

The invention relates to the field of information security, and discloses a laser eavesdropping defense and alarm system and method. The system comprises a wave-absorbing power generation layer and a laser eavesdropping defense circuit. The wave-absorbing power generation layer comprises a substrate and a wave-absorbing power generation material at least partially covering the substrate, the wave-absorbing power generation layer is configured to absorb light waves of infrared light and / or near-infrared light and convert the light waves of infrared light and / or near-infrared light into electric signals, and the wave-absorbing power generation layer is evenly divided into n areas. The laser eavesdropping defense circuit is coupled to the wave-absorbing power generation layer, the laser eavesdropping defense circuit is configured to judge whether the wave-absorbing power generation layer is irradiated by laser according to the electric signal emitted by the wave-absorbing power generation layer, and the laser eavesdropping defense circuit detects the voltage change of each area of the wave-absorbing power generation layer. By means of the system, whether laser irradiation exists or not can be accurately judged, and laser eavesdropping is effectively prevented.

The application discloses a high-power micro-ring special model signal processing method and device for photoelectric fusion, and belongs to the technical field of micro-ring modeling. The method comprises the following steps: S1, generating an input optical signal; S2, acquiring input optical power of the input optical signal, inputting the input optical power into a nonlinear effect module to obtain a refractive index variation, an electro-optical bandwidth variation and a loss coefficient variation; S3, updating a refractive index initial value, an electro-optical bandwidth initial value and a loss coefficient initial value based on the refractive index variation, the electro-optical bandwidth variation and the loss coefficient variation to obtain a refractive index real value, an electro-optical bandwidth real value and a loss coefficient real value; S4, performing complex form operation on the input optical signal based on the refractive index real value, the electro-optical bandwidth real value and the loss coefficient real value to obtain an output optical signal; and S5, sending total absorption power of the output optical signal to a plasma dispersion effect submodule and a self-heating effect submodule for feedback. The method improves the accuracy of high-power micro-ring device modeling.

The present application provides a thermoelectric conversion module for calorimetric power measurement and a power measurement method, the thermoelectric conversion module for calorimetric power measurement comprising: a calorimetric body for absorbing power and converting the absorbed power into heat energy; the temperature measuring circuit is used for outputting a corresponding voltage value based on the heat energy, and the voltage value is used for determining the size of the power; the temperature measuring circuit comprises a bridge and three operational amplifiers; the electric bridge comprises a temperature measuring resistor, the temperature measuring resistor is in contact with the calorimetric body, and the resistance value of the temperature measuring resistor is correspondingly changed based on the magnitude of the heat energy; the bridge is used for outputting corresponding differential signals before and after calorimetric power measurement in response to the change of the resistance value of the temperature measurement resistor, and the three operational amplifiers are used for amplifying the differential signals so as to output the voltage value, so that the power measurement efficiency can be improved.

A thermoplastic composition includes: a) from about 30 wt% to about 85 wt% of a polyamide resin; b) from about 1 wt% to about 25 wt% of a polycarbonate-siloxane copolymer; c) from about 5 wt% to about 40 wt% of a glass fiber; and d) a carbon filler component including d1) from greater than 0.1 wt% to less than 1 wt% carbon fiber, d2) from greater 1 wt% to less than 5 wt% carbon black, or d3) from greater than 1 wt% to less than 5 wt% multi-wall carbon nanotubes (MWCNTs). The composition exhibits a percent Absorbed Power measured in Transmission mode of at least 70% when observed according to a Free Space method at a frequency of 77 GHz. The composition exhibits an ε' of at least 5 and an ε" of no more than 4, wherein ε' and ε" are evaluated according to a Free Space Method.

An overcurrent detection device is provided in which the accuracy of the overcurrent detection is high, even if there is a location where the temperature is unknown due to a large instantaneous current. An overcurrent detection device 11 comprises: an instantaneous current estimation unit 101, which estimates an instantaneous current I at location X, where the temperature is unknown, based on an instantaneous voltage V measured in a conductor 111 and an estimated resistance R at location X; an overcurrent determination unit 102, which determines whether an overcurrent is present based on the estimated instantaneous current I; and a power consumption calculation unit 103, which calculates a power consumption P based on the instantaneous voltage V and the estimated instantaneous current I.a temperature estimation unit 104 that estimates and updates a temperature T at location X, where the temperature is unknown, based on a thermal equivalent circuit Tmodel that takes into account at least a thermal resistance Rth and a thermal capacitance Cth of the conductor 111, the absorbed power P, and a known temperature Ta and Tt at at least one location in the conductor 111; and a resistance estimation unit 105 that updates the estimated resistance R at location X, where the temperature is unknown, based on the updated temperature T.

The present invention discloses a measurement environment device and a measurement system for the directional pattern of a millimeter-wave radar antenna, and relates to the field of millimeter-wave radar. The measurement environment device includes: an antenna to be measured, a plurality of environment antenna modules, and a plurality of microstrip antennas, wherein one environment antenna module is connected to a corresponding microstrip antenna, and the microstrip antenna serves as a matching load for the environment antenna module; the plurality of environment antenna modules and the plurality of microstrip antennas form a measurement channel, and the microstrip antenna serves as a matching load to absorb the power emitted outward by the antenna to be measured, and converts the absorbed power into cross-polarized radiated power. Thus, the power emitted by the antenna to be measured is absorbed by the microstrip antenna, and the absorbed power is converted into cross-polarized radiated power, which can simulate the measurement environment of the radar antenna, so that the main polarization directional pattern of the radar antenna can be accurately measured; and the microstrip antenna can be integrated with the environment antenna as a matching load, resulting in a compact structure and greatly reducing the complexity of the measurement environment device.

The invention discloses a single-core step-down phase shifter based on thyristor control and a winding transformation ratio design and multi-mode control method thereof, and the maximum utilization of the winding capacity of the phase shifter and the minimum adjustment step length in the adjustment process are realized through the transformation ratio design of a secondary winding of the phase shifter; when no fault is detected, the transformation ratio of the winding is controlled through the thyristor valve group so as to execute voltage reduction and phase shift operation, the output voltage amplitude and the phase shift angle are kept at reference values, and the system runs normally; after a fault occurs, impedance is calculated, and the fault position is determined; when an upstream fault occurs, entering a low-voltage protection mode, and limiting a non-fault phase-to-ground voltage through a phase shifter winding; and when a downstream fault occurs, entering a fault current limiting mode, and compensating voltage and absorbing power through a phase shifter winding so as to limit fault phase current and maintain non-fault phase voltage. According to the invention, the functions of voltage stabilization during normal operation of the phase shifter, low-voltage protection during abrupt drop of upstream voltage and current limiting during a downstream short-circuit fault can be realized.

An absorption sheet for absorbing power from an electromagnetic wave generated by a device under test includes a substrate and an array of absorption elements. Each absorption element includes a conductive portion and a resistive portion. A system for performing a radiation characterization includes the absorption sheet. A method of measuring a radiative near field of a device under test and a method of characterizing a radiative near field of a device under test are also disclosed.

The invention relates to the field of information security, and discloses a system and a method for defending and reversely positioning laser. The device comprises a transparent or semitransparent hard base layer used for transmitting visible light. And the wave-absorbing power generation layer comprises a substrate and a wave-absorbing power generation material which at least partially covers the substrate, and is used for absorbing the light waves to generate power and converting the light waves of the infrared light and / or the near-infrared light into electric signals. The specially-made grating layer is arranged on the outer side and / or the inner side of the wave-absorbing power generation layer in parallel, and scattering or diffraction enhancement is carried out on the infrared light and / or the near-infrared light irradiated on the wave-absorbing power generation layer. The specially-made photosensitive element array comprises a plurality of specially-made photosensitive elements which are arranged on the innermost side and cover the hard base layer, and the specially-made photosensitive elements sense the wavelength of eavesdropping laser. And the signal processing unit is electrically connected with each layer, and the signal processing unit converts the light intensity change into an electric signal. According to the application, the laser eavesdropping signal can be quickly and accurately identified, and the incident angle and the specific point location of the eavesdropping laser can be reversely deduced.

The invention discloses a low earth orbit satellite thermal radiation pressure modeling method based on a heat transfer mechanism. The method comprises the steps that panel optical parameters and thermodynamic parameters are determined; calculating panel radiation absorption power according to the panel optical parameters; determining the initial temperature of the panel according to the optical parameters and the thermodynamic parameters of the panel in combination with the radiation absorption power of the panel; according to the panel initial temperature, the panel temperature of a subsequent epoch is updated through a numerical integration method; and determining the thermal radiation pressure of the low-orbit satellite according to the updated panel temperature. Based on a panel-satellite body heat transfer mechanism, low-orbit satellite thermal radiation pressure modeling including panel initial temperature determination and temperature dynamic updating is realized.

The present invention proposes an implementation device and method for in-situ measurement of multi-parameters in point scanning of an alkali metal atomic gas chamber, and designs a structural device capable of three-dimensionally moving scanning of the laser intersection. The laser, Glan prism, and rear-end optical power meter are fixedly connected and installed in one direction of the three-dimensional scanning device as the measurement direction; the same laser and Glan prism are also installed in the other direction of the three-dimensional scanning device as the auxiliary measurement direction. According to the absorption saturation effect, the power difference of the corresponding light absorption is calculated in two states: only the measurement direction laser is turned on, and the auxiliary measurement direction laser is turned on first and then the measurement direction laser is turned on. The actual light absorption power of the intersection of the two vertically incident light beams can be obtained. Using the principle of the optical depth method, the atomic number density and temperature and other parameters at the intersection of the light beams can be obtained. Combined with the three-dimensional scanning device, parameter testing of any point inside the atomic gas chamber can be achieved.

An apparatus is provided that is configured to supply power to, or absorb power from, a load (1) connected to a power system (2), the load being connected to, or connectable to, a load conductor (3). The apparatus comprises a power supply and / or absorption device (6) configured to selectively supply power to, or absorb power from, the load conductor (3), and a control unit (7) configured to control the power supply and / or absorption device (7). The control unit (7) determines a voltage reference value for the power supply and / or absorption device (6) based on at least one value indicative of the voltage of the load conductor (3) and the virtual impedance of the power supply and / or absorption device (6), and controls the power supply and / or absorption device (6) to supply power to the load (1) by supplying power to the load conductor (3), or absorb power from the load (1) by absorbing power from the load conductor (3), based on the determined voltage reference value.

An absorption sheet for absorbing power from an electromagnetic wave generated by a device under test includes a substrate and an array of absorption elements. Each absorption element includes a conductive portion and a resistive portion. A system for performing a radiation characterization includes the absorption sheet. A method of measuring a radiative near field of a device under test and a method of characterizing a radiative near field of a device under test are also disclosed.

The application relates to a metal 3D printing system and printing method for reducing metal splashing, and belongs to the technical field of 3D printing. The system comprises a laser, an imaging module arranged on the light path of the laser beam emitted by the laser, a vibrating mirror module and a printing work surface. An optical path shaping module is arranged between the laser and the vibrating mirror unit. The optical path shaping module comprises an angle adjusting ring, a first collimating lens, a first Powell prism and a second collimating lens which are sequentially arranged in the light path direction and are installed in the angle adjusting ring. The first Powell prism is eccentric, the laser beam is diffused in one direction, and the energy of the diffused laser beam is gradually weakened from one end to the other end of the diffusion direction. During printing, the direction of the diffused laser beam of the first Powell prism is adjusted by the angle adjusting ring, so that the end with the same scanning direction and higher energy is located at the front end of the scanning direction, the absorption power of the liquid metal to the laser is reduced, and the splashing of the metal liquid drops is reduced.

The present application discloses a disc structure of a hole disc type hydraulic dynamometer and its design method, which relates to the field of hydraulic dynamometers. The design method determines the reference rectangles corresponding to the respective circular holes formed in the disc body of the original disc of the hole disc type hydraulic dynamometer, constructs two semi-elliptical arcs with the same curve shape and bending direction based on the reference rectangles, and obtains the improved holes at the reference rectangles from the closed hole profile line obtained based on the two semi-elliptical arcs, the third baseline and the fourth baseline. The improved disc obtained by this improved design includes the improved holes at the respective reference rectangles of the disc body. The improved disc designed in this way can be directly used to replace the original disc, and can increase the absorption power of the hole disc type hydraulic dynamometer without changing the overall structure of the unit, increasing the overall weight of the unit, and affecting the rotor moment of inertia, and optimizing the performance of the hole disc type hydraulic dynamometer.

The utility model discloses a graded water-cooling high-energy laser total absorption device which comprises an absorption barrel and a water-cooling module. The water cooling module comprises a first-stage cooling water tank, a second-stage cooling water tank and a third-stage cooling box; a water circulation channel is provided between the absorption barrel and the primary cooling water tank by a first water inlet pipe and a first water return pipe; the first-stage cooling water tank and the second-stage cooling water tank are blocked by a graded water partition plate, and a water circulation channel is provided by a communicating water pipe and a water partition plate communicating hole in the graded water partition plate; a water circulation channel is provided between the second-stage cooling water tank and the third-stage cooling tank through a second water inlet pipe and a second water return pipe. According to the utility model, water is used as a direct absorber, the absorption of continuous high-energy laser in a million-watt-level power range is realized, the power level coverage range is wide, and the applicability is wide; aiming at absorption and full-automatic graded water cooling of lasers with different power grades, the laser water cooling device avoids insufficient or excessive flowing of cooling water, ensures the water cooling effect and has high reliability.

Thermoplastic compositions include: a thermoplastic polymer component including a polyester; and from greater than 0.10 wt % to about 1.95 wt % of a carbon nanotube (CNT) fdler. A 6 in×8 in×⅛ in molded sample of the composition has a percent Absorbed Power measured in Transmission mode of at least 60% when observed at a 77 GHz frequency according to a Free Space method. In some aspects the polyester includes polybutylene terephthalate (PBT). Further aspects include articles (e.g., a radar sensor, a camera, an electronic control unit, etc.) including a molded part including a microwave absorbing material (absorber). The article may have at least two openings to allow the transmission of microwave radiation between a transmitting antenna and a receiving antenna located in / on the printed circuit board of the sensor.