31results about How to "Response bandwidth" patented technology

The invention belongs to the technology of new energy resources, relates to a rotary wave energy piezoelectric power generation apparatus which is used for collecting ocean wave energy and converting the ocean wave energy into electric energy. The apparatus is composed of a primary transduction component, an intermediate conversion component, a secondary transduction component and a sealing assembly. The primary transduction component is composed of a damping plate, a slide shaft, a damping plate fastening nut, a floating body, an upper slide sleeve and a lower slide sleeve, an upper balance spring and a lower balance spring, a middle support and a lower support. A broadband rotary piezoelectric generator in the secondary transduction component altogether has six structural forms, wherein arrayed piezoelectric cantilever beams in the broadband rotary piezoelectric generators in different structural forms have different natural frequencies, and thus the frequency bandwidth is relatively wide. The middle conversion component can effectively convert low-frequency linear motion into high-frequency rotation motion, and the power generation efficiency is relatively high. The apparatus is characterized by wide response frequency band and high power generation efficiency, does not need a control system, and can absorb ocean wave energy to the utmost.

The invention provides a pulse pre-pumping single-ended vector BOTDA dynamic strain measuring method and measuring device. Stepped pulsed light is utilized to be incident from one end of a sensing fiber, spontaneous Brillouin scattered light generated by a 0-order baseband pre-excited sound wave field of time-limited microwave modulation pre-pumping pulsed light and back Rayleigh scattered light generated by a 1-order sideband serve as probe light, and both generate an excited Brillouin scattering effect with sensing pulsed light; frequency beating of local oscillator light and the probe light carrying Brillouin scattering information is performed in a balance detector, in-phase and orthogonal components in an electrical signal which are obtained after frequency beating are utilized to obtain an excited Brillouin scattering phase shift value, and finally a corresponding dynamic strain value is demodulated according to a corresponding relation curve of phase shifts and dynamic strain which is stored in a computer. The pulse pre-pumping single-ended vector BOTDA dynamic strain measuring device is simple in structure and convenient to use, can effectively reduce a non-local effect, improves a signal to noise ratio of a system, and can realize dynamic strain measurement with wide band, high spatial resolution and measurement accuracy, and good reliability and stability.

The invention discloses a fluid dynamic energy conversion device imitating tail fin swing vibration excitation, relates to an energy conversion device and aims to solve the problems that a current wave energy generating device is limited in vibration amplitude, narrow in response frequency band, low in energy conversion efficiency, capable of making a piezoelectric plate deform by purely utilizing seawater pressure, low in energy utilization rate, not suitable for large-scale application and poor in environmental adaptation. The fluid dynamic energy conversion device imitating tail fin swing vibration excitation comprises a base, a swing assembly, two drawbars and two piezoelectric generating assemblies, wherein the swing assembly comprises a bionic tail fin, a swing rod, a connecting slide block and a swing rod base; the swing rod base is mounted on the middle part of the base; the lower end of the swing rod is hinged with the swing rod base; the connecting slide block is arranged on the swing rod in a sleeving mode; the bionic tail fin is mounted at the upper end of the swing rod; the two piezoelectric generating assemblies are oppositely arranged on the base; each two piezoelectric generating assembly comprises a slide rod, a permanent magnet base, a sealing cover, a housing, a piezoelectric generating base, two springs, a plurality of vibration excitation permanent magnets, a plurality of vibration receiving permanent magnets and a plurality of piezoelectric plates. The fluid dynamic energy conversion device imitating tail fin swing vibration excitation is used for energy conversion and power generation.

The invention discloses a piezomagnetic / piezoelectric broadband vibration energy collector adopting a rotary pendulum type structure. The energy collector is characterized in that a door type frame is designed, a hole is arranged at the upper end of a left supporting plate (8) of the frame, a bearing (6) is mounted in the hole, a cantilever beam (7) is mounted in the bearing, one extended-out end of the cantilever beam sequentially penetrates into a sway hole of a rotary type eccentric pendulum (4) and then is fixedly connected with a piezomagnetic / piezoelectric energy converter (1), the piezomagnetic / piezoelectric energy converter is embedded in an air gap formed by a pair of permanent magnets (2), an armature (3) connected with the permanent magnets is fixed on a right supporting plate (5), or one extended-out end of the cantilever beam (7) supported by the bearing is connected with a fixing plate (12) of the pair of the permanent magnets (2), the piezomagnetic / piezoelectric energy converter is embedded in an air gap formed by the permanent magnets (2), and a central shaft of the piezomagnetic / piezoelectric energy converter is fixed on the left supporting plate (8) of the door type frame.

The invention provides a single-ended vector BOTDA (Brillouin Optical Time Domain Analysis) dynamic strain measurement method, and a measurement apparatus thereof. The single-ended vector BOTDA dynamic strain measurement method comprises utilizing one composite optical signal to realize incidence from one end of a sensor fibre, wherein the back Rayleigh scattering light generated from the microwave modulation pulse substrate light in the sensor fibre is used as the probe light; the sensor pulse light generated from the microwave modulation pulse substrate light in the sensor fibre is used as the pump light; generation of the probe light and pump light are affected by the stimulated Brillouin scattering; the local oscillator light and the probe light carrying the stimulated Brillouin scattering information perform beat frequency in a photoelectric detector and extract the in-phase and quadrature components in an electric signal; the quotient of the in-phase and quadrature components and the phase shift of the stimulated Brillouin scattering has the relationship of arc tangent function so that a phase shift value is obtained; and finally according to the corresponding relationship curve stored in the computer between the phase shift and the dynamic strain, the corresponding dynamic strain value is obtained through modulation. As a nondestructive single-ended structure is introduced into a vector BOTDA, the single-ended vector BOTDA dynamic strain measurement apparatus is simple in structure and convenient for application, and is high in the response frequency band width and the measurement accuracy, and can improve the stability and reliability of a dynamic strain measurement system.

The present invention provides a metamaterial, comprising: a multi-layer conductive geometric structure layer, each layer of the multi-layer conductive geometric structure layer includes a substrate and a plurality of conductive geometric structures located on the substrate, each layer of conductive geometric structure The spacing between adjacent conductive geometries on the layers is equal, and the spacing between adjacent conductive geometries on at least one conductive geometry layer is not equal to the spacing between adjacent conductive geometries on other conductive geometry layers. The present invention also provides a metamaterial comprising: a multi-layer conductive geometric structure layer, each layer of the multi-layer conductive geometric structure layer includes a substrate and a plurality of conductive geometric structures located on the substrate, the multi-layer conductive geometric structure layer The spacing between adjacent conductive geometric structures among the plurality of conductive geometric structures on at least one conductive geometric structure layer in the structural layer is unequal.