170 results about "Rf field" patented technology

The invention relates to the technical field of quantum measurement, in particular to a device for improving atom coherent population trapping efficiency and an implementation method. Screening candidate frequency points; judging a temporary frequency point; extracting concerned frequency points; correcting a target frequency point; c field and power adjustment; and applying a radio frequency field and performing frequency locking output. According to the invention, the radio frequency sweep frequency operation is carried out at the preset C field current value and the preset radio frequency power in the high-altitude field area, and the real-time collection and analysis of the transmitted light intensity, the internal temperature of the cavity and the external air pressure are combined, so that the target frequency point is screened from the original to-be-determined frequency points in a multi-level and multi-angle manner; and the C-field current and the radio frequency power are dynamically adjusted, so that high-precision locking of the radio frequency output frequency is further realized, the imprisoning efficiency of atom coherent population can be remarkably improved, the adaptive capacity and the compensation capacity of the system to external disturbance are enhanced, and the system has relatively high environmental robustness and frequency stability.

A method and corresponding devices to reduce the presence of unwanted ions within the pseudo-potential well of the RF fields for inductively coupled plasma mass spectrometry is disclosed. This method reduces space-charge effects and leaves more room available for the ions of interest and, hence, leads to increased transmission of the desired ions into the mass analyzer. In the present invention, the space charge is reduced by adding a low-band resolving DC potential, or a fast sweeping resolving DC potential with a notch, or a fast constant resolving DC potential with a notch, or by adding auxiliary quadrupolar or dipolar RF potential to the quadrupole ion guide, such that all the unwanted ions will be outside the stable region and therefore ejected. This reduces the charge density in the ion beam and ameliorate space charge effects.

The invention discloses a multi-source interference real-time suppression algorithm suitable for a fusion terminal and an intelligent electric energy meter, and relates to the technical field of electric power Internet of Things terminal signal processing, and the algorithm comprises the following steps: constructing a multi-source interference mixed domain feature model; multi-source interference is separated and suppressed in real time through an adaptive sparse filtering method; dynamically adjusting filtering parameters, and optimizing filtering calculation through block processing and fixed-point operation; and real-time switching of interference types is supported. According to the multi-source interference real-time suppression algorithm, interference such as ringing waves, pulse trains and radio frequency fields is effectively separated and suppressed through mixed domain feature modeling and self-adaptive sparse filtering, the signal quality is optimized, the algorithm can dynamically adjust filtering parameters according to equipment types, the signal adaptability of a fusion terminal and an intelligent electric energy meter is ensured, and the real-time suppression of the multi-source interference is achieved. And meanwhile, low-power-consumption and high-efficiency real-time processing is realized through block processing and fixed-point operation, and the hardware requirement of an embedded platform is met.

The invention relates to the field of electromagnetic field technology and radio frequency signal testing, in particular to a radio frequency standard field generation system and method based on near-field beam forming, and the system comprises a control unit, a radio frequency signal generation unit, a radio frequency field control unit and a broadband radiation antenna array. The control unit carries a near-field electromagnetic wave synthesis mathematical model and is used for receiving a target field type setting requirement and calculating excitation amplitude and injection compensation phase required by each radiation unit configured in the broadband radiation antenna array; the radio frequency signal generation unit comprises a pulse modulation laser source and a plurality of semiconductor radiation units and is used for generating high-power programmable radio frequency signals; the radio frequency field control unit comprises an optical delay line and an FPGA matrix and is used for performing amplitude and phase regulation and control on the high-power programmable radio frequency signal output by the radio frequency signal generation unit; and the broadband radiation antenna array is used for receiving the regulated radio frequency signal and radiating the regulated radio frequency signal to the near-field space of the darkroom, and a target field pattern is formed through multi-unit electric field vector superposition.

The invention discloses a ticket checking method, a ticket checking system and a related device, and relates to the technical field of communication. The method is applied to first electronic equipment, and a first account is logged in the first electronic equipment. The method comprises the following steps: after entering a radio frequency field of a gate, receiving a first authentication request sent by the gate, the first authentication request comprising a first random number and a first identifier of the gate; determining a first order token based on the first identifier; determining first authentication information based on the first order token and the first random number; and sending a first authentication response to the gate, wherein the first authentication response comprises the first authentication information and the first random number. Therefore, the first electronic equipment can encrypt the first order token by adopting the preset encryption algorithm model based on the first random number, and sends the first authentication information obtained after encryption to the gate, so that the security of a ticket checking process can be improved.

The invention provides a method for triggering connection between a mobile device and an ETC device by using NFC, and the method specifically comprises the following steps: 1, enabling the mobile device to be close to the ETC device for a preset distance, and enabling an NFC module of the mobile device to generate a radio frequency field signal; step 2, the ETC device automatically sends a signal to the main control module and transmits data stored by the NFC module to the mobile device after sensing a radio frequency field signal sent by the mobile device; 3, the master control module controls the Bluetooth module to be turned on after receiving the signal of the NFC module of the ETC equipment; step 4, after the mobile device receives the data transmitted by the NFC module of the ETC device, analyzing and processing the data, and skipping to a predetermined ETC application; and step 5, after the ETC application in the mobile device is opened, automatically searching the Bluetooth of the ETC device and automatically initiating connection after successful searching. According to the method, automatic connection between the mobile equipment and the ETC equipment can be realized in a non-contact state.

Multi-echo radio frequency (“RF”) gradient based magnetic resonance imaging (“MRI”) is described. A gradient is established in the B1 RF field to enable B1-encoded pulse sequences, such as B1-encoded spin-echo pulse sequences. As a non-limiting example, the B1-field gradient can be established using a multi-echo frequency-modulated Rabi encoded echoes (“ME-FREE”) technique.

This specification provides a circuit unit for implementing near field communication and an NFC device. The solution includes an NFC antenna, an NFC chip, and an excitation circuit, where the NFC antenna is connected to the NFC chip, the NFC chip is connected to the excitation circuit, and the NFC chip is configured to: obtain first energy in a case that the NFC antenna senses a radio frequency field of a user terminal device, and provide a part of the first energy to the excitation circuit; and the excitation circuit is configured to generate and send an excitation signal by using energy obtained from the NFC chip, wherein the excitation signal is used to excite the user terminal device to communicate with a device comprising the circuit unit.

The invention discloses a radio frequency signal smart card with key switch control and a control method thereof, and belongs to the field of smart cards, the device comprises a smart card body, the smart card body is internally provided with an outer ring radio frequency antenna, a radio frequency chip, a key switch, an LED lamp pole chip and an inner ring radio frequency antenna, and the outer ring radio frequency antenna is arranged at the edge in the intelligent card body. The key switch is pressed to enable the radio frequency chip and the LED lamp pole chip to form an access through the outer ring radio frequency antenna and the inner ring radio frequency antenna, and power is supplied to the radio frequency chip and the LED lamp pole chip through cooperation of a radio frequency field, the outer ring radio frequency antenna and the inner ring radio frequency antenna near a card reader. An algorithm is pre-stored in the key switch to generate a one-time password and transmit the one-time password to the card reader, unauthorized scanning is prevented, relay attacks are resisted, an LED indicating lamp on the LED lamp pole chip indicates the transaction state, using is more visual, experience is better, active safety control is achieved through a simple structure, and the encryption scheme is simple, convenient and superior to a pure software encryption scheme.

The invention discloses a microwave measurement and control device, and relates to the technical field of particle acceleration. The antenna comprises a backboard, a radio frequency unit and a tuning unit. The backboard is provided with a high-speed serial transmission channel; the radio frequency unit is connected with the backboard to collect radio frequency field state data of the accelerator cavity; the tuning unit is connected with the backboard to output a driving signal to adjust the resonant frequency of the cavity. Wherein the radio frequency unit and the tuning unit establish a direct connection link through a high-speed serial transmission channel, and the tuning unit cooperatively adjusts the resonant frequency of the cavity according to radio frequency field state data. A traditional CPCI architecture is optimized through the backboard, the high-speed serial transmission channel comprises the first communication channel, radio frequency field state data does not need to be transferred and is directly transmitted to the tuning unit through the high-broadband and high-performance first communication channel, the problems of large transmission delay and cooperative lagging caused by bandwidth sharing of an existing CPCI architecture are effectively solved, and the communication performance of the CPCI architecture is improved. Tuning can be rapidly carried out through closed-loop control, and the stability of the accelerator beam is remarkably improved.

The present application discloses a payment method and system, and a related apparatus. The method comprises: after entering a radio frequency field of a collection device, receiving a first payment request sent by the collection device, wherein the first payment request comprises a first amount and an identifier of one or more payment modes supported by the collection device; on the basis of the first payment request, determining a first payment mode from among the one or more payment modes supported by the collection device; and completing payment by means of the first payment mode. In this way, an electronic device can complete payment by means of a touch with the collection device, thereby simplifying payment steps and improving payment efficiency.

A user device including near-field communication (NFC) circuitry may receive a polling message from an NFC terminal. The user device may obtain information based at least in part on the polling message. The user device may determine a characteristic of the NFC terminal based at least in part on the information. The characteristic may be indicative of a radio frequency (RF) field strength of the NFC terminal. The user device may adjust an RF setting of the NFC circuitry based at least in part on the characteristic. The RF setting may correspond to an RF sensitivity of the NFC circuitry.

The application discloses a power supply field service smart cabin intelligent management and control method and system based on multi-source fusion, relates to the technical field of electric power Internet of Things and smart operation and maintenance, and comprises the following steps: triggering RFID batch scanning through radio frequency field micro disturbance, and performing time sequence consistency verification on the scanning result to obtain tool unique identification information and current in-place state data; collecting environment data in the smart cabin, time aligning and fusing the environment data and the tool in-place state data in an event-driven mode to generate a multi-source perception data set; performing health state analysis on the tool according to the multi-source perception data set, optimizing the storage position and access path of the tool according to the analysis result, and outputting a tool storage and taking scheduling strategy; and the application solves the problems of low tool state perception accuracy, poor multi-source data fusion quality, inability to identify health evolution trend and unreasonable storage path optimization in the power supply field service smart cabin.

The invention provides a high-precision microwave electric field intensity measurement system and method based on CTC phase change, and belongs to the technical field of microwave measurement. Comprising a quantum sensing unit, an optical excitation and detection module, a microwave regulation and scanning module, an auxiliary radio frequency field module and a signal processing and control center. The method comprises the following steps: S1, preliminary preparation of Rydberg-state atoms; s2, preparing CTC phase atoms; s3, identifying a phase change critical point; and S4, measuring and calculating microwave electric field intensity measurement sensitivity improvement at the phase change critical point. According to the invention, a Rideburg system is prepared to a CTC phase change critical point area which is extremely sensitive to electric field intensity change response, and high-precision measurement of microwave electric field intensity is completed by using the extremely high gain of the system to an electric field intensity change signal at the moment.

A radio frequency (RF) drying device is provided. The RF drying device includes a drying chamber including a grounded body enclosing a plurality of N (N≥3) electrodes for generating radio frequency field, and a drum electrically insulated from the plurality of electrodes, and a processor configured to select and activate M (<N) electrodes among the plurality of N electrodes and deactivate one or more remaining (N−M) electrodes periodically and to to select M(<N) electrodes for being activated to generate AC signals and deactivate N−M electrodes for being inactivated not to generate AC signals in an active mode, and RF field is formed inside the drying chamber based on the generated AC signals.

The embodiment of the invention discloses an offline judgment method of identity information and an identity card reader, the offline judgment method is applied to the identity card reader, and the method comprises the following steps: sending out a radio frequency signal according to a preset communication protocol and sequence to generate a radio frequency field, and forming a target communication range; when the target identity card is in the target communication range, obtaining target ciphertext information of the target identity card; and determining a judgment result of the identity information of the target identity card based on the target ciphertext information and a preset expected standard of the target personal information attribute. The ciphertext information and the expected standard of the target personal information attribute are used for judgment, whether the target personal information attribute of the target identity card meets the expected standard or not is determined to generate a judgment result, plaintext information in the identity card is not obtained, personal identity information is not displayed, and only the judgment result is displayed; the personal information is ensured not to be stored and leaked, and the personal privacy is protected to the greatest extent.

The invention provides a tire pressure monitoring data direct-reading method, device and system based on passive NFC (Near Field Communication), and the method comprises the following steps: a tire pressure monitoring device enters a radio frequency field coverage range generated by an external intelligent terminal, a power management chip in the device converts a formed unstable direct-current voltage into a constant working voltage to supply power to the device, and after the device is electrified, the power management chip supplies power to the tire pressure monitoring device; tire pressure monitoring data of a tire corresponding to an installation position is collected, the collected tire pressure monitoring data is packaged into a uniform resource locator (URL) containing query parameters, the URL is written into an NFC storage area of the device and is read by an external intelligent terminal, and the external intelligent terminal is directly triggered to call a web browser of a system based on a protocol format of the URL. According to the device, power is supplied through passive NFC radio frequency, and the tire pressure monitoring data are output in a uniform resource locator mode, so that the device can achieve real-time collection, transmission and direct reading display of the tire pressure monitoring data under the condition that a battery and a special application program are not needed.

The embodiment of the application discloses a method for determining the sensitivity distribution of a magnetic resonance receiving coil. The method comprises the following steps: obtaining a reference image, contrast information between at least two kinds of tissues corresponding to a target part in the reference image is suppressed; determining an initial radio frequency field map corresponding to the target part based on the reference image; obtaining a transmission field map of a transmission field where the target part is located, and determining the sensitivity distribution of the magnetic resonance receiving coil corresponding to the target part based on the initial radio frequency field map and the transmission field map. According to the sensitivity distribution of the magnetic resonance receiving coil and the transmission field map of the transmission field, the uniformity correction of a magnetic resonance image under high field strength can be realized.

The invention relates to a near field communication method and device. The first device operates in a card mode and includes an NFC controller. The second device operates in a reader mode. In an NFC communication method, a first device exits an observer mode when an NFC controller receives content of a captured radio frequency field sequence.

The utility model relates to a radio-frequency excitation control device for tumor hypoxia research, which comprises a mounting frame, a radio-frequency signal excitation module is mounted on the upper side of the left part of the mounting frame, a radio-frequency signal control module is mounted on the upper side of the right part of the mounting frame, and the radio-frequency signal control module is electrically connected with the radio-frequency signal excitation module. An electric push rod is mounted on the right side of the mounting frame, a lifting table is connected to the telescopic end of the electric push rod, a radio frequency coil is connected to the lifting table, and the radio frequency coil is also electrically connected with the radio frequency signal control module. The electric push rod drives the lifting platform to vertically move, the radio frequency coil is driven to accurately adjust to a target height, and a radio frequency field uniformly covers a sample area, so that test requirements of samples of different specifications are met, an electromagnetic environment is closed by the protective frame, test safety is favorably improved, influence of electromagnetic diffusion on the test is prevented, and test efficiency is improved. Meanwhile, an operator can observe the test condition in real time through the transparent structure in the middle of the protective frame.

The present teachings generally relate to generating a pseudo-barrier via an axial RF field. A first voltage is applied to a first pair of rods arranged in a multi-pole configuration, a second RF voltage is applied to a second pair of rods, and a difference between magnitudes and / or phases of the first and second RF voltages is adjusted. As discussed in more detail herein, such a pseudo-barrier may be employed in a variety of different applications. As an example, such a pseudo-barrier may be used to trap ions within a rod group that includes a plurality of rods arranged in a multi-pole configuration. In other applications, adjusting the height of the pseudo-potential barrier established in the rod set along with the application of a DC potential between the rod set and an external electrode can be used to cause mass-selective extraction of ions trapped within the rod set. In other applications, such a pseudo-barrier may be employed in a multiplexing method to perform mass spectrometry.

A method is provided for detecting a proximity of a radio frequency (RF) field during an ongoing RF activity by a wireless device operating in reader mode. In the method, an input signal is modulated to provide a modulated RF signal comprising a plurality of RF modulation periods. The plurality of RF modulation periods are transmitted by the wireless device operating in the reader mode. An RF detector is enabled to monitor the plurality of modulation periods during the transmitting of the plurality of RF modulation periods. An external RF signal is detected when a characteristic of the plurality of RF modulation periods is different from an expected characteristic. In another embodiment, a wireless device is provided that implements the method.

The utility model discloses a positioning tool which is used for enabling an annular workpiece in a reaction cavity to be coaxial with the reaction cavity. Comprising a fixing unit, a first moving unit and a second moving unit, the fixing unit is arranged at the opening of the reaction cavity, the first moving unit penetrates through the fixing unit, and the second moving unit is connected with the first moving unit; the first moving unit can drive the second moving unit to move in the axial direction, and the second moving unit can move in the radial direction. During use, after an annular workpiece is placed in a reaction cavity, the fixing unit is placed at an opening of the reaction cavity, then the first moving unit moves in the vertical direction, the bottom end of the second moving unit connected with the first moving unit is just as high as the annular workpiece, and then the second moving unit moves in the radial direction; and meanwhile, the annular workpiece is pushed to be coaxial with the reaction cavity. Therefore, the technical problem that the airflow field and the radio frequency field in the reaction cavity are affected due to the fact that coaxiality positioning cannot be carried out after the annular workpiece is manually placed in the reaction cavity is solved.

This application discloses a high-precision microwave frequency measurement method and system based on continuous-time crystal phase transitions, belonging to the field of quantum sensing technology. This method utilizes the characteristic of the Rydberg atom system at the critical point of a continuous-time crystal phase transition where the response slope of the detected light transmission signal to the microwave frequency is significantly enhanced, breaking through the resolution limit of traditional linear responses. The system includes a quantum sensing unit, an optical excitation and detection module, a microwave modulation and scanning module, an auxiliary radio frequency field module, and a signal processing and control center. By precisely adjusting the parameters, the system is driven to the vicinity of the critical point, the critical frequency is identified, and its high response slope is used to achieve precise frequency measurement. This invention employs a two-stage measurement process, balancing wide dynamic range and high precision, and can be flexibly tuned to adapt to different frequency bands, possessing broad application prospects, especially in microwave communication, frequency metrology, and other fields with significant technical value.

A plasma generating device includes: a chamber which is equipped with a dielectric wall structure and into which sample gas to be measured flows; an RF supplying mechanism that generates plasma inside the chamber using an electric field and / or a magnetic field through the dielectric wall structure; and a floating potential supplying mechanism that includes a first electrode disposed along an inner surface of the chamber. The RF supplying mechanism may include an RF field forming unit disposed in a first direction with respect to the chamber and the first electrode may include an electrode disposed in a second direction with respect to the chamber.

A method according to one embodiment includes placing a microcontroller of an access control device in a sleep state, monitoring a radio frequency (RF) field using a near field communication (NFC) controller and an NFC antenna of the access control device, waking the microcontroller from the sleep state in response to detecting that an RF field value of the RF field has surpassed a predefined threshold, masking capacitive touch events received by the microcontroller from a capacitive touch controller in response to waking the microcontroller from the sleep state, processing RF-intensive communication between the access control device and a mobile device in response to masking the capacitive touch events, and unmasking capacitive touch events received by the microcontroller from the capacitive touch controller in response to processing the RF-intensive communication.

The radio frequency coil system for magnetic resonance imaging equipment provided by the present invention comprises: a cylindrical body; a radio frequency coil disposed around the cylindrical body, the radio frequency coil including multiple feed ports spaced apart along its circumference; and multiple feed assemblies disposed on the cylindrical body, the feed assemblies corresponding one to each of the feed ports and connected to the corresponding feed ports. Compared to existing technologies, the present invention, by providing multiple feed ports and corresponding multiple feed assemblies, achieves a more uniform distribution of the radio frequency field generated by the radio frequency coil, thereby improving magnetic resonance imaging results.

Disclosed in the present application are a ticket checking method and system, and a related apparatus. The method is applied to a first electronic device, on which a first account has been logged in to. The method comprises: after entering a radio-frequency field of a gate, receiving a first item identifier sent by the gate; on the basis of the first item identifier, determining a first opening identifier (OpenID), wherein the first OpenID is generated on the basis of the first item identifier and the first account, and the first OpenID is used for the gate to verify whether the first account logged in to on the first electronic device has a permission to open the gate; and sending a first response to the gate, wherein the first response comprises the first OpenID. In this way, the first electronic device can complete ticket checking by means of touching the gate, thereby simplifying steps of ticket checking, improving the efficiency of ticket checking, and bringing a better experience for users.

Apparatuses and methods for accelerating charged particles include an accelerator. The accelerator includes a cavity comprising a chamber and conductive walls enclosing the chamber, and having one or more inlets and one or more outlets, an electro-magnet substantially surrounding at least a portion of the cavity; two or more rods disposed predominantly longitudinally within the chamber; and one or more RF couplers. The RF couplers are configured to generate a rotating or non-rotating dipole radio frequency field within the cavity by exciting the RF couplers in phase to accelerate the charged particles entering the cavity through the one or more inlets. The radio frequency field operates predominantly in transverse electromagnetic mode.

This invention provides a radio frequency field characteristic testing device and method. A linear slide bar, a magnetic scale, and a motor are all fixed on a scanning chassis. The linear slide bar and the magnetic scale are placed side by side. A slider slides on the linear slide bar, and a receiving antenna is mounted on the slider via an adapter. The magnetic head of the magnetic scale is mounted on the slider, and the magnetic scale measures the displacement of the receiving antenna. The motor drives the receiving antenna to move. One end of a cylinder is located on the bottom surface of the scanning chassis away from the linear slide bar, and the cylinder has the function of extending and retracting in a direction perpendicular to the normal of the scanning chassis. The other end of the cylinder is located on a connecting flange, which is fixed to the inner frame of the turntable. This invention differs from the standard gain horn of the scanning bracket. This invention uses a small circularly polarized antenna and makes full use of the turntable's own rolling axis structure. The linear guide bar and the rotation of the turntable form a planar scan. The structure is relatively simple and compact, and it is suitable for measuring the electromagnetic field characteristics in the quiet zone of a hardware-in-the-loop simulation system.