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30 results about "Radiation power density" patented technology

The radiation energy density is x 10^ J/m 3. In astronomy and astrophysics texts, the energy density in radiation is typically written.

Uwb short-range radar

A transmitting unit emits a short pulse wave which satisfies a predetermined spectrum mask from an antenna into space. A receiving unit receives a reflected wave produced by an object existing in space of the short pulse wave emitted by the transmitting unit. A signal processing unit analyzes the object based on an output signal from the receiving unit. The transmitting unit has a pulse generator which outputs pulse signals each having a predetermined width at a predetermined frequency, and a burst oscillator which receives the pulse signal output from the pulse generator and performs an oscillation operation for time corresponding to the width of the pulse signal to output the short pulse signal. A width and a cycle of the pulse signal and an oscillation frequency of the burst oscillator are set such that almost an entire main lobe of a spectrum of the short pulse wave falls within a range of 24.0 to 29.0 GHz in the predetermined spectrum mask, and that a radiation power density to an RR radiowave emission prohibited band held by the predetermined spectrum mask is lower than a peak radiation power density of the main lobe by not less than 20 dB.
Owner:ANRITSU CORP

Method for calculating radiation power density of antenna of mobile communication base station

The invention discloses a method for calculating the radiation power density of an antenna of a mobile communication base station. The method comprises the steps that a horizontal plane normalization directivity function and a vertical plane normalization directivity function are established, a measuring point away from a vertical plane by the assigned distance is selected for the antenna, the fitting coefficient of the horizontal plane normalization directivity function of the antenna is obtained by obtaining the antenna radiation power data at the measuring point and performing fitting, the final gain value from the antenna of the mobile communication base station to an antenna panel is determined based on the antenna theoretical gain value of the mobile communication base station, a computing model for the radiation power density of the antenna of the base station is established according to the fitting coefficient of the horizontal plane normalization directivity function of the antenna and the finial gain value from the antenna to the antenna panel, and the antenna radiation power density suitable for any azimuth angle can be worked out. The method has the advantages of being high in accuracy and suitable for any azimuth angle.
Owner:STATE GRID CORP OF CHINA +2

Laser fire initiating explosive device optical window in double-self-focusing lens structure

The invention relates to a laser fire initiating explosive device optical window in a double-self-focusing lens structure and belongs to the optical window design of laser fire initiating explosive devices. The optical window overcomes the technical defects of the traditional laser fire initiating explosive device optical window in the prior art, the reduction of the laser radiation power density can be avoided, the entrance of proportional reflecting light into a detection optical fiber can also be ensured, and the consistency of the reflectivity of each fire initiating explosive device is improved. The window comprises a laser device, an ignition optical fiber, a detector, a detection optical fiber, a first self-focusing lens and a second self-focusing lens, wherein the laser device is connected with the first self-focusing lens through the ignition optical fiber, the detector is connected with the first self-focusing lens through the detection optical fiber, the first self-focusing lens and the second self-focusing lens are in parallel arrangement, and in addition, optical axes are coaxial. The laser fire initiating explosive device optical window has the advantages that the ignition laser power density is kept, the ignition reliability margin is ensured, in addition, the reflectivity randomness of the optical window is effectively reduced, the quantitative detection of the reflecting light is favorably realized, and the validity of the continuous detection of the optical path is further improved.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI

Device and method for enhancing read-write capacity of RFID tag and intelligent checking device

The invention relates to a device and method for enhancing the read-write capacity of an RFID tag and an intelligent checking device. The problem that an existing RFID tag is poor in read-write capability is solved. The device enhancing the read-write capacity of the RFID tag comprises at least one RFID reader-writer antenna and at least one RFID read-written tag which are arranged between two mutually parallel reflection plates respectively; the radiation beam direction of the RFID reader-writer antenna is perpendicular to any reflection plate, and the RFID read-written tag is not close to the RFID reader-writer antenna or any reflection plate. The device has the advantages that total reflection is approximatively formed because radiation waves of the read-write antenna are approximatively perpendicular to a metal conductor plate; reflection waves and incident waves are superposed in the forward direction to achieve the enhancing effect, the electromagnetic wave radiation power density is multiplied, the field intensity difference is small, and therefore the tag is easy to read and write; batch dense tags which are close to one another are also successful and fast read and written, and the stability of system acquisition data is improved.
Owner:李卫星

Optical window based on double-self-focusing lens structure

The invention belongs to the field of laser initiating explosive devices, and particularly relates to an optical window based on a double-self-focusing lens structure. The optical window comprises anignition laser, a detection laser, an optical switch, a photoelectric detector, a first self-focusing lens, a second self-focusing lens and a sapphire transparent window, wherein the ignition laser isconnected to the optical switch through an ignition input fiber and a detection input fiber correspondingly, the optical switch is connected with the first self-focusing lens through the ignition optical fiber, the photoelectric detector is connected with the first self-focusing lens through the detection optical fiber, the second self-focusing lens and the sapphire transparent window are sequentially placed behind the first self-focusing lens, and optical axes of the first self-focusing lens, the second self-focusing lens and the sapphire transparent window are coaxial. According to the optical window, the technical defects of an existing laser initiating explosive device optical window are overcome, the laser radiation power density is avoided, a certain proportion of detection light isguaranteed to enter the detection optical fiber, the consistency of the reflectivity of the initiating explosive devices is improved, and the capability of the chamber pressure resistance of the optical window is improved.
Owner:NANJING UNIV OF SCI & TECH

Residual passive intermodulation test method

The present invention provides a residual passive intermodulation test method. The residual passive intermodulation test method comprises: performing self calibration of the system for testing so as to satisfy a presetting test requirement; scanning the background in a testing place so as to check and remove other interferences; performing calibration of the radiation power density of the system for testing according to the max radiation power density of the position where a satellite to be measured is located so as to allow the radiation power density of the system for testing to reach the level of the max radiation power density; and sampling and obtaining the max radiation power density of the satellite to be measured at different positions relative to the different positions in the testing field, and correspondingly obtaining different radiation power densities of the system for testing so as to obtain relatively stable radiation power density reading. According to the invention, an appropriate wireless test system is built and is calibrated so as to ensure that the passive intermodulation index of the satellite test environment reaches the requirement of the satellite passive intermodulation test, and therefore, the test result authenticity is ensured and the test error influence is decreased.
Owner:CHINA ACADEMY OF SPACE TECHNOLOGY

Calculation Method of Radiated Power Density of Mobile Communication Base Station Antenna

The invention discloses a method for calculating the radiation power density of an antenna of a mobile communication base station. The method comprises the steps that a horizontal plane normalization directivity function and a vertical plane normalization directivity function are established, a measuring point away from a vertical plane by the assigned distance is selected for the antenna, the fitting coefficient of the horizontal plane normalization directivity function of the antenna is obtained by obtaining the antenna radiation power data at the measuring point and performing fitting, the final gain value from the antenna of the mobile communication base station to an antenna panel is determined based on the antenna theoretical gain value of the mobile communication base station, a computing model for the radiation power density of the antenna of the base station is established according to the fitting coefficient of the horizontal plane normalization directivity function of the antenna and the finial gain value from the antenna to the antenna panel, and the antenna radiation power density suitable for any azimuth angle can be worked out. The method has the advantages of being high in accuracy and suitable for any azimuth angle.
Owner:STATE GRID CORP OF CHINA +2

Visual Simulation Prediction Method of Base Station Electromagnetic Radiation Based on Simplified Directional Function

The invention discloses a base station electromagnetic radiation visualization simulation prediction method based on a simplified directional function, the steps of which are as follows: through mathematical simplification of the antenna directional attenuation function, the practical simplified calculation of any point in space is realized; each equivalent position curve of the antenna space limit is predicted, Realize the prediction of the three-dimensional visualization isosurface of a single antenna; at the same time, realize the prediction of the visualization curve of the space electromagnetic radiation power density in the vertical direction, and the prediction of the visualization curve of the 1.7m high electromagnetic radiation power density on the ground. Through the open design and conventional multi-parameter adjustment, the prediction model established by the present invention can accurately calculate and visualize the maximum electromagnetic radiation intensity at a certain position of a single base station, which is useful for rapid site selection of base stations, visual evaluation of electromagnetic radiation environmental impact, and visualization of environmental protection. Great reference value, with certain social benefits.
Owner:福建省厦门环境监测中心站

Residual passive intermodulation test method

The present invention provides a residual passive intermodulation test method. The residual passive intermodulation test method comprises: performing self calibration of the system for testing so as to satisfy a presetting test requirement; scanning the background in a testing place so as to check and remove other interferences; performing calibration of the radiation power density of the system for testing according to the max radiation power density of the position where a satellite to be measured is located so as to allow the radiation power density of the system for testing to reach the level of the max radiation power density; and sampling and obtaining the max radiation power density of the satellite to be measured at different positions relative to the different positions in the testing field, and correspondingly obtaining different radiation power densities of the system for testing so as to obtain relatively stable radiation power density reading. According to the invention, an appropriate wireless test system is built and is calibrated so as to ensure that the passive intermodulation index of the satellite test environment reaches the requirement of the satellite passive intermodulation test, and therefore, the test result authenticity is ensured and the test error influence is decreased.
Owner:CHINA ACADEMY OF SPACE TECHNOLOGY
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