70 results about "Radiated field" patented technology

An electric field emitted by an electronic equipment is measured by producing at least one radiation measurement in the radiating field of the equipment. Several sets of simultaneous near-field measurements, within a measuring surface located at a short distance from the equipment, are performed. The sets of performed measurements are processed by estimating the statistical properties of the radiated field at any point outside the measuring surface.

The invention relates to an electric equipment shielding effectiveness test system and method. The electric equipment shielding effectiveness test system comprises a radio frequency signal source, a power amplifier, an emission antenna, a receiving antenna, a spectrum analyzer or receiver and a control computer; one end of the radio frequency signal source is connected with one end of the power amplifier; the other end of the power amplifier is connected with the emission antenna mounted on a height-adjustable emission antenna support; during calibration, the receiving antenna is mounted on a receiving antenna support; during measurement, the receiving antenna is fixed in a shielding chamber of an object to be tested; the spectrum analyzer or the receiver is used for receiving the radio frequency signal measured by the receiving antenna; the output end of the spectrum analyzer or the receiver is connected with the control computer. The electric equipment shielding effectiveness test system and method effectively solve the technical problems of damage to sensitive equipment and instability of the existing shielding effectiveness test method, and can be applied to the radiation sensitivity test of the electric equipment under an HIRF (high intensity radiated field) environment.

Leaky wave antennas that can be reconfigured in pattern and / or polarization by exploiting the characteristic of metamaterial structures loaded with variable capacitor and inductors employ a Composite Right Left Handed (CRLH) unit cell with two independent DC biases used to actively change the group delay of the transmission line and the polarization of the radiated field while preserving good impedance matching. Different degrees of pattern and polarization reconfigurability are achieved by cascading multiple of these unit cells along a straight line, a circular line or a zigzag line while preserving high gain for all the antenna configurations and good impedance matching.

A low-loss, low-profile dual-polarization slotted waveguide antenna includes one or more waveguides having a characteristic wavelength. Radiation apertures comprised of a waveguide slot pairs are formed in each or the waveguides of the antenna. Each waveguide slot pair includes a first waveguide slot and a second waveguide slot which are configured for inducing a circularly polarized (CP) radiated field in the waveguide. The waveguide slots of each waveguide slot pair may be generally crescent-shaped and spaced a distance of at least approximately one-fourth of the characteristic wavelength from each other. The waveguide slots may further be positioned for allowing the antenna to receive and / or radiate both left-hand and right-hand circularly polarized fields (LHCP and RHCP) and for providing control of the sense of a circularly polarized (CP) field radiated by the antenna by changing the direction of incidence of an electromagnetic source wave propagated in the waveguide.

A hybrid method is presented by which Monte Carlo techniques are combined with iterative relaxation techniques to solve the Radiative Transfer Equation in arbitrary one-, two- or three-dimensional optical environments. The optical environments are first divided into contiguous regions, or elements, with Monte Carlo techniques then being employed to determine the optical response function of each type of element. The elements are combined, and the iterative relaxation techniques are used to determine simultaneously the radiance field on the boundary and throughout the interior of the modeled environment. This hybrid model is capable of providing estimates of the under-water light field needed to expedite inspection of ship hulls and port facilities. It is also capable of providing estimates of the subaerial light field for structured, absorbing or non-absorbing environments such as shadows of mountain ranges within and without absorption spectral bands such as water vapor or CO2 bands.

An antenna system that allows increasing the reading reliability of RFId systems by dynamically changing the shape or the polarization of the electromagnetic field radiated by the RPId reader. The system includes at least one reconfigurable antenna, a variable DC bias unit and a methodology to efficiently use the system in RFId applications. The system allows changing the direction in which the energy is radiated or the polarization of the radiated field in order to “move” the electromagnetic field and to also read RFid tags that receive faint signals with standard RFid systems. Polarization alignment between the reader's antenna and the transponder allows for maximum power transfer, while changing the direction of radiation allows concentrating the electromagnetic field towards the transponder.

The present invention is a detection device, system and method for detecting an external electromagnetic event such as lightning or a high intensity radiated field. In an exemplary embodiment, the detection device includes a free space capacitive sensor and a protected amplifier circuit coupled with the free space capacitive sensor. The free space capacitive sensor and the protected amplifier circuit are configured to respond to a voltage waveform produced by an external electromagnetic event. The free space capacitive sensor serves as a single input capable of detecting the external electromagnetic event and the coupling of the free space capacitive sensor to the protected amplifier circuit allows subsystems in communication with the sensor and amplifier circuit to generate a coordinated response to the detected external electromagnetic event.

Methods and apparatus for reducing radiated field feedback in radio frequency (RF) transmitters. An exemplary RF transmitter includes a power amplifier (PA) and a low-field oscillator (LFO) that are co-located, either on a common module or integrated in the same integrated circuit chip. By using an LFO for the transmitter's local oscillator, radiated field feedback from the PA to the LFO is substantially reduced. In addition to, or instead of using an LFO to reduce radiated field feedback, the LFO or a voltage controlled oscillator (VCO) may be configured to operate at either a harmonic or a non-integer multiple of the transmitter's output signal frequency. Using an LFO or VCO and / or operating the oscillator at a harmonic or a non-integer multiple of the radio system output signal frequency reduces the degree by which electromagnetic fields generated by the radio system's PA and antenna interfere with electromagnetic fields generated by the LFO or VCO, thereby allowing the LFO or VCO to be co-located with or integrated in the same integrated circuit chip as the radio system's PA.

A method of using an interferometric confocal microscope to measure features of a trench or via in a substrate, wherein the interferometric confocal microscope produces a measurement beam, the method involving: focusing the measurement beam at a selected location at or near the bottom of the trench or via to excite one or more guided-wave modes within the trench or via; measuring properties of a return measurement beam that is produced when the measurement beam is focused at the selected location, wherein the return measurement beam includes a component corresponding to a radiated field from the one or more guided-wave modes that are excited within the trench; and determining the features of the trench or via from the measured properties of the return measurement beam.

An electromagnetic transponder including: a parallel oscillating circuit adapted to extracting a supply signal from a radiated field; in parallel with the oscillating circuit, several branches each including a programmable resistor and a switch; and a cyclic control element for successively turning on the switches, each resistor forming an element for storing a portion of the code stored in the transponder.

An antenna system is described where uniform radiation pattern coverage is provided in the plane of a low profile antenna element. A polarization that is orthogonal to the plane of the low profile antenna element can be achieved for the radiated field. Tuning mechanisms are described to provide a method for dynamically altering the radiation pattern and for adjusting the frequency response of the antenna during the manufacturing process as well as at field installation. The antenna system is capable of being implemented in applications such as local area network (LAN), cellular communication network, and machine to machine (M2M).

The invention discloses blades of a multi-blade collimator for electronic wire conformation and intensity modulated radiation therapy (IMRT), which are mainly characterized in that: the blade of the electronic multi-blade collimator is made of tungsten with thickness of 1.50 to 2cm so as to block most of electrons and generate relatively less bremsstrahlung; the end face of the blade is an upright end face, an inclined end face of which the inclined plane forms an angle of 3.75 to 60 degrees with a ray center shaft, and an arc-shaped end face with curvature radius of 0.75 to 0.85cm, and dosage penumbrae generated by the three end faces are basically the same; and the width of the blade is 0.8 to 1.2cm, so that radiated field edge dosage is relatively accurate and the accurate input of the subfield dosage is facilitated. Compared with the photon multi-blade collimator which is commonly used at present, the electronic multi-blade collimator has the advantages of simple structure, small occupied space, low cost, and more suitability for the electronic wire conformation and intensity modulated radiation therapy (IMRT) to better treat superficial tumors.

The invention belongs to the technical field of compact antenna radiation field and target scattering test systems and discloses a rectangular high-efficiency compact antenna radiation field and target scattering test system. The rectangular high-efficiency compact antenna radiation field and target scattering test system is provided with a rectangular high-efficiency compact field feed source anda rectangular shaped reflector, wherein the rectangular high-efficiency compact field feed source is fixed on a fixed bracket; the fixed bracket is connected with a rectangular shaped reflector backbracket and a reflector liftoff angle adjusting bracket through a connecting rod; and the rectangular shaped reflector is arranged on the rectangular shaped reflector back bracket. Field intensity distribution of an emergent field can be well controlled; compared with a traditional non-shaped reflector, the rectangular shaped reflector has the advantages that the array-fed emergent field has a radiation pattern of a rectangular beam and the radiation pattern has a steep falling edge aligned with the edge of the rectangular shaped reflector, so that edge diffraction of the reflector can be moreeffectively eliminated; sawtooth or curling treatment is added to the edge of the reflector, so that level amplitude of a dead zone is reduced; and the emergent field is uniform in amplitude and theefficiency of the dead zone is high and can reach 70%.

The invention relates to the technical fields of high-energy lossless testing (such as radiography, industrial CT, etc.), and discloses a dual-purpose collimator with a clearance. The collimator comprises two pairs of collimating blocks that can respectively move horizontally and vertically, wherein, when the pair of collimating blocks that can move vertically move to relatively shut horizontally, a horizontal clearance is formed between the pair of collimating blocks that can move vertically, wherein, the horizontal clearance can be formed by a small groove milled in the collimating blocks that can move vertically or a gasket with certain thickness arranged on two corners of the collimating blocks that can move vertically. The dual-purpose collimator of the invention achieves a purpose that the collimator can precisely realize small-sized horizontal clearances when being used for industrial CT, have high precision, good repeatability as well as no influences on the application of the collimator in radiography simultaneously under a condition of hardly affecting production cost by designing fixed horizontal clearances on the collimating blocks of the common collimator with a simple function of a two-dimensional definite radiation filed.

The invention provides a method and device for measuring neutron dose equivalent. The method comprises steps of: establishing a liquid scintillator counting zone, a central counting zone, and a peripheral counting zone, wherein the liquid scintillator counting zone comprises a liquid scintillator, the central counting zone comprises a first neutron counter, the peripheral counting zone comprises multiple second neutron counters; acquiring first neutron dose equivalent by means of the interaction of the neutron and the liquid scintillator; acquiring second neutron dose equivalent by means of the interaction of the neutron and the first neutron counter; acquiring third neutron dose equivalent by means of the interaction of the neutron and the second neutron counters; and computing the first neutron dose equivalent, the second neutron dose equivalent, and the third neutron dose equivalent in order to obtain the dose equivalent of a neutron radiation field. The method and the device in the technical scheme of the invention may measure low-energy, intermediate-energy, and high-energy neutrons relatively independently so as to achieve neutron dose equivalent measurement with high sensitivity and a wide range.

Various embodiments for detecting a high Intensity radiated field (HIRF) in a line replaceable unit are provided. In an embodiment, the internal detector comprises a receiving means for receiving HIRF and generating an AC signal proportional to the HIRF, an RF filter configured to sample the AC signal to create a DC signal; and a detecting section configured to compare the DC signal with a threshold and output a result of the comparison to a built-in test section. The internal detector may be used to test EMI filter pin connectors of a closed line replaceable unit.

The present invention discloses a method which applies a nuclear radiation field theory for measuring the flyash material level, firstly the boundary condition of the flyash bucket is assured; the interface of flyash in the ash bucket is leaded to approximate to the surface-shaped radiant body, and the relationship between the boundary of the surface-shaped radiant body and the boundary condition of the ash bucket is established; according to the mathematical model of exposure rate of gamma filed at the upper part of the interface surface-shaped radiant body, the corresponding relationship between the gamma exposure rate and the height of the material level is established; the actually measured gamma exposure rate is taken into the corresponding relationship, then the ash bucket inner material level height corresponding to the gamma exposure rate is obtained. The method of the invention uses the theoretical knowledge of the nuclear radiating field, the flyash interface in the ash bucket is taken as the surface-shaped radiating body for considering, the relationship between the exposure rate of the gamma field at the upper part of the surface-shaped radiating body and the height of material level in the ash bucket is established, only with the boundary condition of the ash bucket and the measured gamma-field exposure rate the height of the material level in the ash bucket can be obtained. In the practical application the invention has the advantages of practicability, simple operation and accurate data.

The invention discloses a heavy-metal-multiplication wide-energy neutron source intensity measurement system, which can be suitable for single-energy or wide-energy neutron radiation field source intensity measurement and value transfer of a high-energy accelerator and a reactor and the like. The system comprises a neutron probe, a signal processing system and a data analysis system. The neutron probe is formed by a central thermal neutron detector, an inner-layer moderator, a neutron multiplication layer, a peripheral thermal neutron detector, a reflecting layer, a lateral thermal neutron absorber, an external-layer moderator and a forward thermal neutron absorber. The central thermal neutron detector adopts a position-sensitive neutron detector to obtain energy spectrum information of aradiation field; and an energy weighting factor is set to compensate for energy response of the central thermal neutron detector, thereby improving measurement precision. The system is novel in structure, wide in energy range and good in angle response performance, can carry out energy response compensation and is high in source intensity measurement precision and the like.

A linear method for measuring the radiation EMI in GIEM chamber includes putting the object (EUT) to be measured on an turntable in GTEM chamber, determining the relative relation between various axises of EUT and various axises of GTEM chamber, rotating the turntable by alpha angle counterclockwise, measuring 6 data at a certain frequency but different 6 positions, using the linear equations set to find out the equivalent electric and magnetic couple moments, and calculating the radiated field intensify in wide field.

A hybrid method is presented by which Monte Carlo techniques are combined with iterative relaxation techniques to solve the Radiative Transfer Equation in arbitrary one-, two- or three-dimensional optical environments. The optical environments are first divided into contiguous regions, or elements, with Monte Carlo techniques then being employed to determine the optical response function of each type of element. The elements are combined, and the iterative relaxation techniques are used to determine simultaneously the radiance field on the boundary and throughout the interior of the modeled environment. This hybrid model is capable of providing estimates of the under-water light field needed to expedite inspection of ship hulls and port facilities. It is also capable of providing estimates of the subaerial light field for structured, absorbing or non-absorbing environments such as shadows of mountain ranges within and without absorption spectral bands such as water vapor or CO2 bands.

An antenna module is described where uniform radiation pattern coverage is provided in the plane of a low profile antenna radiating element. A polarization that is orthogonal to the plane of the low profile antenna radiating element can be achieved for the radiated field. A ground plate aperture is implemented into the antenna ground plate to minimize frequency shift as the antenna is installed on metallic (conductive) and non-metallic (non-conductive) ground planes of varying sizes. This antenna system technique is applicable for use in communication systems such as a local Area network (LAN), cellular communication network, and Machine to Machine (M2M).

The invention relates to a method for constructing a controllable optical pin array based on collinear antenna array radiation theory. The method is implemented by reverse focusing the radiation fieldof a virtual collinear antenna array located in the focal region of a 4 focusing system. Each unit of the antenna array is arranged along the optical axis direction, and the current of each unit is uniformly distributed along the optical axis direction. The length and the center position of the nth segment of the optical pin respectively depend only on the length and the coordinate position of the nth array element in the collinear array. The number of optical pins in the optical pin array is equal to the number of array elements in the antenna array. Each segment of the optical pin is strongly and longitudinally polarized and the lateral FWHM remains unchanged throughout the focal depth range. The optical pin array produced by the method is expected to be used for multi-particle acceleration, trapping, manipulation, and the like.

An Electro-Magnetic Imaging (EMAI) System is presented. EMAI systems can include induction elements (e.g., an induction coil) configured to induce a target tissue to generate internally sourced ultrasounds. The induction elements can be shielded by one or more shielding elements to shape, or otherwise alter, an imaging field while attenuating radiated fields in a far zone. EMAI systems can further include a shield tuner to adjust shield parameters to achieved desired imaging or radiated field properties. A shielding element can be placed approximately one induction coil radius away from the coil to achieve suitably strong imaging field magnitudes while also achieving suitably weak radiated field magnitudes in a far zone. In some embodiments, acoustic sensors lack substantial shielding from the fields generated by the induction elements.

The invention discloses a lens type ultra-wide spectrum electromagnetic pulse radiating antenna and antenna array. The structure is simple, and a radiated field strength of a principal axis of a TEM horn antenna can be effectively improved. The antenna includes an upper pole plate and a lower pole plate; the upper pole plate and the lower pole plate form a TEM horn shape having a gradually-variedimpedance; the antenna further includes a housing, a lens and a cable head; the housing includes a bottom plate, an upper side plate and a lower side plate; start ends of the upper pole plate and thelower pole plate are connected to the bottom plate, and the start end of the upper pole plate is connected to a core wire of the cable head; one end of the upper side plate is connected to an upper edge of the bottom plate, and a lower surface of the other end of the upper side plate is connected to an aperture end of the upper pole plate; one end of the lower side plate is connected to a lower edge of the bottom plate, and an upper surface of the other end of the lower side plate is connected to an aperture end of the lower pole plate; an inner surface of the lens is a plane; an outer surfaceof the lens is a spherical surface, an ellipsoidal surface or a double curved surface; and the inner surface of the lens is fixedly connected to one side, located on the aperture end, of each of theupper side plate and the lower side plate.

The invention relates to a method for implementing a light pipe field array having predetermined characteristic. According to the method, a hollow light pipe array is achieved by reversely rotating aradiation field of an isotropic collinear magnetic current antenna array arranged at a focus region. A simulation example shows that the implemented hollow light pipe is in pure azimuthal polarization, the light intensity distribution within the whole focal depth range is hardly maintained unchanged, and the shape and the position of the hollow light pipe are respectively dependent on an element factor and an array factor. The light pipe array having predetermined property, implemented by the method, can be expected to be used for the fields of multi-particle capturing and control, multi-particle processing and photoetching and the like.

An apparatus for communicating with wireless devices is described. The apparatus in one form includes a shrouded antenna arrangement (700) which is arranged to produce a radiated field forming a pre-determined detection zone having a boundary, spaced apart from the arrangement. Outside of the boundary the energy of the radiated field is below a pre-determined cut-off threshold. The shrouded antenna arrangement (700) in one form comprises an antenna (705) within an RFAM shroud (710). The RFAM shroud (710) may then have an absorption profile that varies around the antenna to form the detection zone.

A method of using an interferometric confocal microscope to measure features of a trench or via in a substrate, wherein the interferometric confocal microscope produces a measurement beam, the method involving: focusing the measurement beam at a selected location at or near the bottom of the trench or via to excite one or more guided-wave modes within the trench or via; measuring properties of a return measurement beam that is produced when the measurement beam is focused at the selected location, wherein the return measurement beam includes a component corresponding to a radiated field from the one or more guided-wave modes that are excited within the trench; and determining the features of the trench or via from the measured properties of the return measurement beam.

The invention discloses a method for testing space electromagnetic radiation interference via a planar circuit. The method comprises the steps of: (1) placing a planar test circuit in a region to be tested; (2) measuring voltage and current responses of loads of cables; (3) and calculating to obtain a space radiation field surrounding the cables by adopting a finite-difference time-domain method FDT in a cable and space radiation field coupling model according to the voltage and current responses of the loads of the cables obtained through test in the step 2. The method provided by the invention can solve the problem of large testing error caused by electromagnetic radiation interference signals in a testing space under the conditions that the testing space of a field intensity meter (a current probe) is small and the cables are dense. Through testing the voltage response of the cables, the surrounding space electromagnetic field is calculated, the application rage is expanded by adopting a multi-cable coupling model, the influence of reflected waves is effectively eliminated by using matched loads, the difficulty of testing the space electromagnetic field under the conditions of small internal space and dense cables is effectively solved, and the method is suitable for popularization and application in the fields of microwave technologies and electromagnetic compatibility.