31results about How to "Response bandwidth" patented technology

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 super material. The super material includes a plurality of electric conduction geometric structure layers; each electric conduction geometric structure layer in the plurality of electric conduction geometric structure layers comprises a substrate and a plurality of electric conduction geometric structures arranged on the substrate; intervals between adjacent conductive geometric structures on each electric conduction geometric structure layer are equal; and intervals between adjacent electric conduction geometric structures on at least one electric conduction geometric structure layer are not equal to intervals between adjacent electric conduction geometric structures on other electric conduction geometric structure layers. The super material provided by the invention may include a plurality of electric conduction geometric structure layers; each electric conduction geometric structure layer in the plurality of electric conduction geometric structure layers comprises a substrate and a plurality of electric conduction geometric structures arranged on the substrate; and intervals between adjacent electric conduction geometric structures on at least one electric conduction geometric structure layer in the plurality of electric conduction geometric structure layers are not equal.

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.

A fiber grating earthquake acceleration detector based on a combined type cantilever structure comprises a board-shaped base. A cylindrical supporting column and a cylindrical connecting piece are arranged at the top of the base. A through hole is formed in the connecting piece. The supporting column is fixed with one end of a uniform-section cantilever. The other end of the uniform-section cantilever is connected with a mass block. The mass block is uniform in shape and size and is formed by combination of a first right-angle folding ruler L-type cantilever and a second right-angle folding ruler L-type cantilever which are of a right-angle folding ruler L type. A first fiber grating and a second fiber grating which are made of the same material and identical in length are further arranged between the mass block and the connecting piece. The first fiber grating and the second fiber grating are in series connection in a fused mode outside the connecting piece. According to the fiber grating earthquake acceleration detector based on the combined type cantilever structure, the shortages that an existing acceleration detector can not satisfy the technical indexes of high flexibility, wide response bandwidth, a large dynamic range, simple manufacturing and the like are overcome.

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 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 relates to a frequency converter based on a ridge-type lithium niobate monocrystal thin-film waveguide integrated periodic domain reversal structure, and preparation thereof. The preparation comprises the following steps: preparing a periodic structure with domain reversal region duty ratio as 0.5 on a lithium niobate monocrystal thin-film surface by using the same laser processing parameter; and then preparing ridge-type waveguide on the lithium niobate monocrystal thin-film by applying femtosecond laser direct writing or precise diamond knife-cutting technology, and integratingon a pre-processed periodic structure; and then performing polishing treatment on two X end surfaces of the LNOI, cleaning and obtaining polished surfaces; and then integrating a semiconductor laserand an optical fiber coupling system, the lithium niobate monocrystal thin-film waveguide with the periodic domain reversal structure and an optical filter, thereby realizing the frequency conversionfunction of the laser with specific wavelength. The frequency converter disclosed by the invention has the features of being high in conversion efficiency, good in beam quality and long in life; and the product is mainly applied to the optical fiber communication, the electronics device preparation, the information storage, the infrared detection and like fields.

The invention discloses a grid-side winding alternating-current harmonic detection system based on a converter transformer. The system comprises a current harmonic measurement sensor installed outsidea grid side sleeve ascending flanged base, a voltage harmonic measurement sensor sleeving a parallel coupling capacitor grounding wire, a signal acquisition module, a voltage-stabilized power supplyand a portable computer. The current harmonic measurement sensor can obtain a current signal of a converter transformer winding. A voltage harmonic measurement sensor sleeving a coupling capacitor ground wire can obtain a converter transformer grid side winding voltage signal by detecting a ground current signal and calculating the ground current signal, the signal acquisition module is responsible for acquiring and transmitting the signals, and calculation software performs harmonic analysis on the signals. The alternating current harmonic detection system can detect the voltage and current harmonic content of the converter transformer grid side winding, is high in anti-electromagnetic interference capability, meets the requirement for synchronous acquisition of multiple signals, and hashigh real-time performance and accuracy.

The invention provides a magnetic confinement rocker arm type vibration power generation device and system, and relates to the technical field of power generation systems. The magnetic confinement rocker arm type vibration power generation device provided by the invention comprises a fixed frame and a rocker arm hinged to the fixed frame, wherein the rocker arm is provided with a magnetic body, the fixed frame is provided with a fixed confinement magnet assembly and a coil assembly, the fixed confinement magnet assembly and the magnetic body are in mutual exclusion to provide a restoring forcefor the rocker arm, and the coil assembly and the magnetic body are matched to generate electricity. According to the magnetic confinement rocker arm type vibration power generation device provided by the invention, the response frequency band can be broadened, broadband shaking energy collection is achieved, the energy conversion efficiency is high, the driving of water or other media is not needed, and high flexibility is achieved.

The invention relates to a wide-response-band particle vibration velocity sensor, which comprises a sensitive element, and is characterized in that the sensitive element (2) comprises a substrate (21)on which a bridge opening (211) is formed, and a plurality of sensitive wires (20) which are arranged on the bridge opening (211) in parallel; and each sensitive wire (20) sequentially comprises a sensitive material layer (206) and a supporting layer (205) from top to bottom, and the sensitive material layer (206) is of a hollow structure. By adopting the sensitive wires with the hollow structures, the equivalent density of the sensitive wires is reduced, so that the heat mass of the sensitive wires is reduced, the heat exchange rate of the structure is improved, the upper limit of the response frequency of the sensor is effectively improved, the response frequency band of the sensor is expanded, and the mass point vibration velocity of a broadband sound signal can be detected without distortion.

The invention provides a gas detection system and a gas detection method based on a photoacoustic effect. The gas detection system comprises a cold hydrazine pre-concentration device, a gas absorptioncavity, a vertical cavity surface emitting laser diode, a micro-needle cantilever beam detection system, a signal processing system and a control system. According to the gas detection system, the cold hydrazine pre-concentration device is used for removing interference of moisture in a to-be-detected gas, the concentration of the to-be-detected gas is improved, after the gas absorbs light, a sound signal is excited through the photoacoustic effect, the interaction force between the gas and the surface of an absorption cavity is measured by means of a micro-needle cantilever beam tuning fork,the photoacoustic signal intensity is obtained, the gas concentration and the absorption coefficient of the to-be-detected gas for infrared light with the specific wavelength are indirectly obtained,and the gas detection system has wider response frequency band and higher detection precision and sensitivity.

The invention discloses an electromagnetic and electrostatic combined multi-source shaking power generation device, which comprises a sliding block. A first fixing block and a second fixing block arearranged at the two ends of the sliding block respectively, and the first fixing block and the second fixing block are movably connected with the sliding block; a first electrode plate is arranged ateach of two ends of the sliding block; a second electrode plate and a third electrode plate which are overlapped with each other are arranged on each of the first fixing block and the second fixing block; and a load is electrically connected between the third electrode plates. The electromagnetic induction principle and the electrostatic principle are matched with each other, various energy collection sources are provided, and energy collection under different shaking scales is achieved. Electrostatic power generation and electromagnetic power generation are combined, so that the system can achieve a better power generation effect under different shaking excitation amplitudes. Due to the use of the hollow column in spherical hinge connection, shaking energy collection in multiple directions is achieved, and multi-directional power generation is achieved.

The invention relates to a circular plate type vibration energy collector based on an MFC. The circular plate type vibration energy collector comprises a base (8), a guide column (1) fixed to the base (8), an upper center mass block (3), a lower center mass block (7) and a laminated circular plate, wherein the upper center mass block (3) and the lower center mass block (7) are connected with the guide column (1) and are symmetrically arranged up and down, and the laminated circular plate is arranged between the upper center mass block (3) and the lower center mass block (7). The laminated circular plate comprises an upper circular MFC (4), a lower circular MFC (4) and a brass substrate (6), wherein the upper circular MFC (4) and the lower circular MFC (4) have the same structural size, and the brass substrate (6) is arranged between the two MFCs (4). Compared with the prior art, the invention has the advantages of effectively broadening the response frequency band of the collector, reducing friction generated during vibration, being stable in collection and the like.

The invention relates to a monitoring system for magnetic leakage detection equipment. The monitoring system comprises a computer interface module, a signal filtering module, a database module, an automatic detection control module and a human-computer interaction interface. By means of the monitoring system for the magnetic leakage detection equipment, manpower resources are saved; and automation and intelligentization of magnetic leakage detection can be realized. A method for achieving the automatic magnetic leakage detection comprises the steps of obtaining signals by a sensor and then judging whether the signals have defects through software. In existing magnetic leakage detection instruments, sensors for detecting a magnetic leakage field are mainly hall devices. The monitoring system has the advantages of being relatively wide in response frequency band, wide in measurement range, small in size, and steady in temperature property and can be very proper for measuring a non-uniform magnetic leakage field generating defects in a pressure container; and the field detection of the equipment is carried out easily. Magnetic leakage signals of a steel pipe, collected by the hall sensor, enter an A/D conversion module through a conditioning circuit, and finally are computed; digital processing, such as denoising, smoothing and mode recognition, is carried out in a computer; detection information of the steel pipe is finally obtained and displayed; and therefore, real-time requirements are satisfied.

The invention provides a multichannel optical fibre ring sound emission detection system and a demodulation method, and aims to detect a plurality of sound emission signals in a structure body quickly and accurately and monitor the health conditions of the structure body in real time. The sound emission detection system comprises a narrow-band light source, an isolator, a coupler, a reference optical fibre ring, a sensing optical fibre ring, a photo-electronic detection circuit, a band pass filtering circuit, a preamplifier circuit, an analogue-to-digital conversion circuit, an FPGA and a computer. The multichannel optical fibre ring sound emission detection system and the demodulation method are mainly used in the field of sound emission detection; compared with a conventional piezoelectric sensor, the multichannel optical fibre ring sound emission detection system have the advantages of anti-electromagnetic interference and high sensitivity; compared with a conventional demodulation method, the demodulation method has the advantages of simplicity, high efficiency, high calculation speed and low cost, and is beneficial to practical engineering application.