8 results about "Differential modulation" patented technology

This invention discloses a monotonic magnetic ring dual-rotor radial-axis composite modulation magnetic gear. The magnetic gear includes an inner rotor yoke, an inner rotor permanent magnet, a tuning ring, an outer rotor permanent magnet, and an outer rotor yoke. The inner rotor yoke and the inner rotor permanent magnet constitute the inner rotor, and the outer rotor permanent magnet and the outer rotor yoke constitute the outer rotor. The inner and outer rotors are coaxially arranged to form a dual-rotor structure, capable of relative rotation. The tuning ring, a single tuning structure, is positioned between the inner and outer rotors to simultaneously achieve radial modulation and axial differential modulation, thus forming a radial-axis dual-modulation magnetic gear. Both the inner and outer rotor permanent magnets employ an asymmetric Halbach array structure. This application achieves radial modulation and differential modulation, constructing a radial-axis coupled dual-modulation magnetic field structure, improving magnetic field utilization and torque transmission capability.

An airflow generating device includes a first unit disposed in a first region and a second unit disposed in a second region. The first unit and the second unit are correspondingly disposed. The first unit generates a first air pressure having a first polarity in the first region, and the second unit generates a second air pressure having a second polarity in the second region. The second polarity is opposite to the first polarity. At least one of the first unit and the second unit includes a membrane structure, the membrane structure including a pair of flaps, the flap pair including a first flap and a second flap opposite to each other. The flap pair has an initial deflection difference or exhibits an average displacement difference between the first flap and the second flap. The flap pair operates at an ultrasonic frequency, causing the airflow generating device to generate a plurality of air pulses at an ultrasonic pulse rate.

An airflow generating device includes a first cell, disposed within a first region and a second cell, disposed within a second region. The first cell generates a first air pressure with a first polarity in the first region and the second cell generates a second air pressure with a second polarity in the second region. The second polarity is opposite to the first polarity. One of the first and second cells includes a film structure, which includes a flap pair. The flap pair includes a first flap and a second flap opposite to each other. The flap pair possesses an initial deflection difference or exhibits an average displacement difference between the first flap and the second flap. The flap pair operates at an ultrasonic frequency, such that the airflow generating device produces a plurality of air pulses at an ultrasonic pulse rate.

The application discloses a kind of simultaneous differential and phase diversity photonic time stretching systems of dual polarization modulation.The system realizes differential modulation by X and Y polarization state in a single dual polarization quadrature amplitude modulator, and realizes phase diversity by using two dual polarization quadrature amplitude modulators respectively arranged at different bias operating points.The system comprises a pulse generation module, a signal modulation module, a polarization separation module and a data processing module.The pulse generation module generates pre-chirped optical pulses.The signal modulation module modulates radio frequency signals, so that the radio frequency signals carried by the X and Y polarization sub-modulators in the two modulators are differential signals.The polarization separation module separates the X and Y polarization states by a polarization beam splitter.The data processing module uses maximum ratio combining algorithm to suppress the power periodic fading caused by dispersion.The present scheme greatly reduces the sampling rate requirement of the backend ADC, and realizes high-fidelity real-time acquisition of ultra-wideband transient signals with low-cost hardware.

This invention discloses a few-shot image classification model optimization method based on meta-learning, belonging to the fields of computer vision and machine learning. This method introduces task-level contrastive prototype representation, task similarity-guided initialization modulation, gradient direction alignment and adaptive loss weighting, and a contrastive-prototype hybrid classifier into the MAML framework, achieving rapid adaptation and stable optimization under multi-modal task distributions. By performing a few-step inner loop on the support and query sets and using task embedding similarity for differential modulation of the outer loop initialization, it effectively alleviates gradient conflicts between tasks and between tasks and classifiers, improving convergence speed and cross-task generalization ability. Combining contrastive regularization and task-level contrastive enhancement of feature discriminativity significantly improves N-way K-shot classification accuracy while maintaining controllable computational and storage overhead. It is suitable for annotation-scarce scenarios such as medical imaging, industrial inspection, and security monitoring, possessing good industrial applicability and scalability.

The application relates to a silicon optical chip testing method and device, a storage medium and a program product, wherein the silicon optical chip comprises a plurality of electro-optical modulators; the electro-optical modulator is a Mach-Zehnder modulator; the electro-optical modulator comprises a first modulation arm and a second modulation arm; the testing method comprises the following steps: detecting a loop resistance value of each electro-optical modulator corresponding to a preset loop; the preset loop is formed by the first modulation arm, the second modulation arm, the electro-optical modulator and a connecting cable between the electro-optical modulator and a resistance detection device; selecting an electro-optical modulator with the minimum loop resistance value as a reference modulator; determining a reference resistance value according to the difference between the loop resistance value of the reference modulator and the resistance value of the connecting cable; calculating the ratio of the loop resistance value of each electro-optical modulator to the reference resistance value to obtain an electro-optical modulator correction coefficient; and calculating the product of the correction coefficient and a preset modulation voltage to obtain a differential modulation voltage of the electro-optical modulator. The testing method can reduce the interference of contact resistance voltage division on half-wave voltage testing and improve testing accuracy.

An airflow generating device includes a first cell, disposed within a first region and a second cell, disposed within a second region. The first cell generates a first air pressure with a first polarity in the first region and the second cell generates a second air pressure with a second polarity in the second region. The second polarity is opposite to the first polarity. One of the first and second cells includes a film structure, which includes a flap pair. The flap pair includes a first flap and a second flap opposite to each other. The flap pair possesses an initial deflection difference or exhibits an average displacement difference between the first flap and the second flap. The flap pair operates at an ultrasonic frequency, such that the airflow generating device produces a plurality of air pulses at an ultrasonic pulse rate.

This invention relates to the field of fiber optic measurement technology, and particularly to a method and system for measuring and modulating temperature and stress in multimode fiber optics. The method utilizes a single-frequency laser emitted from a pigtail laser, which is then split by a beam splitter and fed into the multimode fiber of the measurement and reference arms. The outgoing light is collimated, polarized, and then combined by a polarization combining crystal. After being modulated by a quarter-wave plate, interference fringes are finally recorded by a polarization mask camera. A four-step phase-shifting algorithm is used to reconstruct the wavefront phase image, extracting two characteristic parameters: the change in the tilt angle of the interference fringes and the change in the wavefront phase distribution. This invention leverages the differences in wavefront response mechanisms of multimode fibers under temperature and stress to achieve two-parameter decoupling. It offers advantages such as high real-time performance, resistance to strong light interference, and a compact structure, making it suitable for integrated precision temperature and stress measurement in industrial monitoring and aerospace fields.