188 results about "Single excitation" patented technology

Optical fiber switches operated by electrical activation of at least one laser light modulator through which laser light is directed into at least one polarizer are used for the sequential transport of laser light from a single laser into a plurality of optical fibers. In one embodiment of the invention, laser light from a single excitation laser is sequentially transported to a plurality of optical fibers which in turn transport the laser light to separate individual remotely located laser fuel ignitors.The invention can be operated electro-optically with no need for any mechanical or moving parts, or, alternatively, can be operated electro-mechanically. The invention can be used to switch either pulsed or continuous wave laser light.

The invention discloses an electromagnetic semicontinuous casting device and a casting method thereof. The electromagnetic semicontinuous casting device comprises a crucible smelting furnace, a crucible standing furnace, a flow control mechanism, a split-flow device, an electromagnetic crystallizer system and a vertical semicontinuous casting machine, wherein the electromagnetic crystallizer system is a metal inner sleeve crystallizer system in which a group of build-in excitation coil is fixed, and comprises a metal inner sleeve, a cooling water cavity, the excitation coil, an oil supply system, an oil distribution system and a protective gas ring. According to the electromagnetic semicontinuous casting device disclosed by the invention, through a method of adjusting the frequency of electrical current, duty ratio and average current strength, the electrical current in a unique wave shape is formed in the single excitation coil placed in the cooling cavity of a crystallizer, so that desired forced convection or shaking effect is formed in the crystallizer with low current intensity; the grain of ingot blank is significantly refined; and columnar crystals are significantly reduced or eliminated to lower macroscopic segregation and realize the technical effect of low-stress casting. Under the condition of similar functional effects, the size of the electromagnetic crystallizer system is one third to one half of that of an original electromagnetic crystallizer system.

An excitation method of a vibrating wire sensor mainly comprises the following operating steps: performing single excitation for exciting coils of the vibrating wire sensor by an intermittent excitation mode to obtain a resonant frequency measured value f1 with low precision; calculating statistical characteristics of vibration signals during various periods, and inspecting the statistical characteristics; exciting the exciting coils of the vibrating wire sensor by adopting a signal with the frequency being f1 and stopping excitation after vibrating wire resonance, or performing frequency-sweep excitation at the position of a narrower bandwidth near the frequency f1; and finally processing signals from vibration pickup coils, and measuring the signal frequency to obtain a measured value f2 as an exact value of vibrating wire resonance frequency. The excitation method of the vibrating wire sensor has the advantages of fast starting of vibration, large amplitude, shortened detection time, improved working efficiency, improved excitation reliability and improved measuring precision. The excitation method of the vibrating wire sensor is applicable to observation on stress strain, deformation, seepage, liquid level, temperature and the like of the projects such as reservoir dams, bridges, foundation pits and the like.

The invention discloses a single-excitation elliptical ultrasonic vibration finishing device, which comprises a base, wherein a composite elliptical vibration amplitude transformer is arranged on the upper end of the base transversely; a clamping mechanism and a central height regulating mechanism are arranged between the base and the composite elliptical vibration amplitude transformer; a diamond pen is arranged on one side of the front end of the composite elliptical vibration amplitude transformer, a transducer is arranged on the rear end of the composite elliptical vibration amplitude transformer, the transducer is connected with an ultrasonic wave generator through a cable; the clamping mechanism and the central height regulating mechanism comprise a vertical long through hole formed on the upper part of the base and a bolt which passes through the long through hole and is fixed with the composite elliptical vibration amplitude transformer; and the composite elliptical vibration amplitude transformer consists of a cylindrical end, a rectangular connecting part, and a vibration transforming end, which are connected in turn. In the invention, the structure of an acoustic system is simple, and the investment cost of the acoustic system is low; and in a machining process, the track of the diamond pen can be controlled easily, the finishing efficiency can be improved, and the surface quality of a grinding wheel can be improved.

The invention discloses a non-contact magnetic induction heart rate and respiration rate synchronous detection method and system. A magnetic induction signal of the left thoracic cavity and a magnetic induction signal of the right thoracic cavity are subject to filtering processing respectively, and a phase difference signal of the left thoracic cavity and a phase difference signal of the right thoracic cavity are acquired; physiological information about heartbeat and respiration can be acquired through a phase detection method. Specific excitation frequency is acquired through screening based on the overall thoracic cavity volume specific conductance detection principle, the influence of an excitation magnetic field is weakened through a single excitation coil, two detection coils and the placing way that the excitation coil is perpendicular to the detection coils, the heartbeat and respiration information is separated from phase information through a rapid and independent component analysis method, and therefore synchronous non-contact heart rate and respiration rate monitoring is achieved.

The invention discloses a single-excitation ultrasonic oval vibration energy converter. The single-excitation ultrasonic oval vibration energy converter comprises an ultrasonic vibration energy converter and an oval vibration mode converter, wherein the ultrasonic vibration energy converter comprises bolts and a rear cover plate, a piezoelectric ceramic piece, an electrode slice and a front cover plate all of which are arranged on the bolt in a sleeved manner and in order, wherein the rear cover plate and the front cover plate connect and tightly compress the rear cover plate, the piezoelectric ceramic piece, the electrode sheet and the front cover plate through the bolts; the oval vibration mode converter is arranged in the front end of the front cover plate and is of an oblique wedged structure; the oval vibration mode converter can convert lengthways ultrasonic vibration generated by the ultrasonic vibration energy converter to lengthways bent composite ultrasonic oval vibration at the terminal end of the oval vibration mode converter. By the adoption of a sandwich type structure, the single-excitation ultrasonic oval vibration energy converter has the advantages of a big power capacity, a simple structure, great rigidity of partial structure of the oval vibration mode converter, high energy conversion efficiency, steady work performances and the like.

The invention discloses a method for real-time measurement of multipoint temperatures based on a fluorescence optical fiber temperature sensor, and belongs to the field of temperature sensors. The method is characterized in that: an excitation light source module is subjected to intensity modulation, thus the excitation light source module outputs the excitation light which has the light intensity comprising N frequency components and excites the fluorescent substances in Q channel optical fiber probes; and a phase lock detection technique is adopted to carry out demodulation on the collectedfluorescence signals through K groups of data obtained by phase shift so as to obtain the fluorescence lifetime of each measurement point, and the temperatures of the corresponding points are furtherobtained. According to the method disclosed by the invention, multi-point measurement can be realized only by adopting a single excitation light source and a signal detecting and processing module, and the advantages of simple and compact structure, low system cost and capability of real-time positioned measurement of multipoint temperatures can be realized.

The invention relates to a vibration system comprising a plurality of vibration tables and a vibration test method, belongs to the technical field of vibration tests, and solves the problems that in the prior art, a vibration system cannot realize multiple uniaxial vibration environments in a laboratory, so that a tested part is subjected to an over-test or an under-test, and the reliability evaluation of a tested product is influenced. The vibration system comprises a test part, a vibration table system, a mechanical decoupling system, a test fixture, a sensor and a vibration control system.The vibration test method comprises the following steps: arranging excitation points, and installing a test part, a test fixture and a mechanical decoupling device; pasting a sensor on the test part;setting random vibration test conditions and a control mode; collection of test data. According to the invention, the vibration load distribution of the slender body structure test part is more uniform, reasonable and real, the stress concentration caused by single excitation is reduced, and the local under-test or over-test degree is reduced.

The invention discloses a multi-working-condition magnetic flux leakage controllable wide-speed-regulation high-efficiency permanent magnet brushless motor. The motor comprises a stator 1, a rotor 2 and a rotating shaft 7 which are sequentially arranged from outside to inside. The stator 1 is composed of stator teeth 8, stator grooves 9 and a stator yoke 10, the stator grooves 9 are formed betweenevery two adjacent stator teeth 8, the radial cross section of each stator tooth 8 is in a T shape, the top of each T shape is close to the rotor 2, and the bottom of each T shape is connected with the stator yoke 10 into a whole. Armature windings are arranged in the stator grooves 9, and the stator grooves 9 are not completely filled with the armature windings; an air gap is formed between theinner wall of the stator 1 and the outer wall of the rotor 2; the rotor 2 and the rotating shaft 7 are connected through a key and rotate concentrically. Because only the single excitation source is adopted, the advantage that the air-gap magnetic field is variable is achieved, no extra electric excitation winding needs to be added, no low-coercivity permanent magnet material capable of achievingon-line magnetism adjustment needs to be additionally introduced, the structure is simple and compact, manufacturing and machining are convenient, extra losses are avoided, and the efficiency of the motor can be better improved.

The invention provides a novel single-excitation ultrasound oval vibration turning device. The single-excitation ultrasound oval vibration turning device comprises a shell unit, an ultrasonic vibration transducer arranged in the shell unit, an oval vibration mode converter and a cutter arranged at the front end of the oval vibration mode converter. The shell unit comprises an outer sleeve, a top plate and a bottom plate, wherein a supporting plate is connected with the outer sleeve in a welding mode or through screws and used for being connected with a lathe cutter rest. The ultrasonic vibration transducer is cylindrical overall and comprises an upper covering plate, a piezoelectric ceramic piece, an electrode piece and a lower covering plate, wherein the electrode piece is connected with an ultrasonic power source, the upper covering plate, the piezoelectric ceramic piece, the electrode piece and the lower covering plate are pressed tightly through bolts to form an energy conversion part of the ultrasonic vibration transducer, ultrasonic electric signals output by the ultrasonic power source are converted into longitudinal ultrasonic vibration of the ultrasonic vibration transducer, and the upper surface of the upper covering plate is connected with the oval vibration mode converter.

The invention discloses an image fusion-based metal magnetic material defect detection device. Sine and cosine signals are applied to two pairs of mutual vertical U-shaped magnet yokes correspondingly, and a rotating magnetic field, of which the synthesis direction is uniformly changed along with time and the amplitude is not changed, serves as an excitation magnetic field for detection of a metalmagnetic material test piece. If the defect exists in the metal magnetic material test piece, a leakage magnetic field is generated above the defect, the leakage magnetic field information is converted into a magneto-optical image through a magneto-optical imaging system, a frequency domain image of a magneto-optical image sequence is normalized, linear weighted fusion is conducted, the image isconverted within the gray value range, and the defect image of the metal magnetic material test piece is acquired. A magnetic field excitation test piece is rotated by low frequency being below 50 Hz,the defect in each direction can be effective excited, the magneto-optical image in single excitation period is acquired by a magneto-optical imaging technology, the defect in each direction is subjected to linear weighted fusion in the frequency domain, and rapid visual detection of the defect in each direction is realized.

Apparatus and method for detecting a nonlinear magnetic particle based on a single excitation coil. The apparatus includes a signal generation unit for generating an input composite signal by combining a high-frequency sine wave signal and a low-frequency sine wave signal, generated based on a fundamental frequency, with each other, a signal application unit for applying the input composite signal to a single excitation solenoid coil included in a measurement head, through which a sample passes, to generate a magnetic field in the measurement head so as to detect a nonlinear magnetic particle, and a detection unit for detecting an output signal emitted from the sample depending on the magnetic field by using at least one detection solenoid coil included in the measurement head, analyzing a frequency domain of the output signal, and detecting whether the nonlinear magnetic particle is present in the sample.

The invention discloses a photoacoustic-fluorescence flow cytometer. The flow cytometer comprises an optical excitation system, a fluorescence signal receiving system, a photoacoustic signal receiving system, a sample platform and a computer display controlling system, wherein the optical excitation system is connected with the fluorescence signal receiving system, the sample platform and the computer display controlling system; the photoacoustic signal receiving system is connected with the sample platform and the computer display controlling system; the fluorescence signal receiving system is connected with the computer display controlling system; the computer display controlling system is electrically connected with the optical excitation system, the fluorescence signal receiving system and the photoacoustic signal receiving system. According to the flow cytometer, as a pulse laser is adopted as a single excitation light source, a photoacoustic signal and a fluorescence signal of a substance to be detected are excited simultaneously, and simultaneously acquired through an upper passage and a lower passage, the photoacoustic signal and the fluorescence signal are detected in real time, and more information about a single cell and granules is acquired.

The invention discloses a magnetic field balance distribution type wireless power transmission system based on magnetic resonant coupling. An emitting end of the system adopts an array-type resonant coil structure and a feeding mode for simultaneously driving all resonant coils by a single excitation coil, and magnetic resonance between resonant coils of a receiving end and a resonant coil array of the emitting end as well as magnetic fields uniformly distributed at the receiving end are realized. While the transmission efficiency higher than 65% is realized, the axial and transverse receiving ranges of the receiving end are expanded and the stability of wireless power transmission is improved. The emitting end and the receiving end adopt planar structures and can be processed through printed circuit boards, a rectifying and voltage-stabilizing circuit is integrated in a blank area of the circuit board of the receiving end, 5-12 V direct-current voltage can be output, and the size of the receiving end can be reduced to 50*50*1 mm<3>. The wireless power transmission system is suitable for various coil structures such as a rectangular coil structure and a square coil structure, and can be applied to one-to-one and one-to-many wireless power transmission of portable computers, tablet computers, LED illumination equipment, sound boxes, mobile communication terminal and small-sized consumer electronics.

A method and magnetic resonance system for imaging a particle that is located in an examination subject with an imaging magnetic resonance measurement execute a gradient echo sequence in which at least two gradient echoes are acquired following a single excitation pulse, wherein the particle in an applied basic magnetic field causes a magnetic interference field. An RF pulse is radiated to generate a transverse magnetization from a magnetization appearing in the basic magnetic field. A first dephasing gradient is shifted to adjust a first dephasing of the transverse magnetization, and the first gradient echo is acquired. A second dephasing gradient is shifted to adjust a second dephasing of the transverse magnetization that is different than the first dephasing, and the second gradient echo is acquired. The two dephasing gradients are shifted such that a dephasing of the transverse magnetization caused by the interference field of the particle is at least partially compensated in a region around the particle or within the particle given the acquisition of at least one of the echoes.

The invention discloses a single-excitation longitudinal-flexural complex vibration ultrasonic energy converter. The single-excitation longitudinal-flexural complex vibration ultrasonic energy converter comprises a front cover plate and a real end cover, copper sheet electrodes and piezoelectric ceramic chips are clamped between the front cover plate and the real end cover in a spaced mode, the front cover plate, the real end cover, the copper sheet electrodes and the piezoelectric ceramic chips are arranged together in a penetrating mode through a pre-tightening bolt, the position, provided with the copper sheet electrodes and the piezoelectric ceramic chips, of the pre-tightening bolt is provided with an insulating cover, and the copper sheet electrodes and the piezoelectric ceramic chips are sleeved with the insulating cover; the left side and the right side of the rear end cover are symmetrically provided two supporting stand columns, the supporting stand columns are arranged at vibration nodes of the energy converter, and the supporting stand columns are fixed through fastening screws; the front cover plate is provided with a rectangular skewed slot which is located in front of the pre-tightening bolt. The single-excitation longitudinal-flexural complex vibration ultrasonic energy converter can easily achieve longitudinal-flexural complex vibration in a plane, and has the advantages of being simple in structure, reasonable in design, strong in transportability and the like.

The invention relates to red-blue dual-emission fluorescent carbon dots and a fluorometric analysis method for simultaneous detection of Al<3+> and Cu<2+> ions. A preparing method of the carbon dots includes grinding dry tea leaves into powder, adding the powder into a reaction solvent to form a mixture, performing room-temperature ultrasonic treatment, then heating and reacting the mixture at 140-250 DEG C for 1-24 h, naturally cooling a reaction product after the reaction is finished to room temperature, performing centrifugation to remove large particles, then performing filtration with a micropore filter membrane having a particle size of 0.22 [mu]m, and performing rotary evaporation to remove the solvent to obtain the carbon dots. The carbon dots have characteristics of single excitation and dual emission, if fluorescence in a blue fluorescence emitting zone is enhanced, the content of Al<3+> ions can be detected with high sensitivity and high selectivity, and if fluorescence in ared fluorescence emitting zone is quenched, the content of Cu<2+> ions can be detected with high sensitivity and high selectivity, thus achieving simultaneous detection of the two types of ions without interferences.

In a method and magnetic resonance (MR) apparatus to acquire spin echo-based MR signals of an examination subject with a multi-spin echo sequence with multiple refocusing pulses after a single excitation pulse in an MR system that has a multichannel RF transmission and reception module: detect a spatial, two-dimensional phase distribution in the examination subject is detected by acquiring navigator signals, a phase and amplitude distribution for the individual transmission channels of the RF transmission and reception module is calculated to generate a magnetic field B1 for one of the RF refocusing pulses to generate the spin echo-based MR signal under consideration of the spatial phase distribution of the navigator signals, and this RF refocusing pulse is radiated via the multichannel RF transmission and reception module with the calculated phase and amplitude distributions of the individual transmission channels.

The present invention provides a magnetic resonance temperature imaging method and system. The method comprises the steps of determining a compound excitation pulse including a plurality of single excitation pulses on basis of a highly accelerated parallel imaging aliasing control method; at a lot of temperature imaging moments, respectively using the compound excitation pulse to simultaneously exciting multilayer imaging areas, and respectively acquiring aliasing signal data of the multilayer imaging areas. calculating and obtaining magnetic resonance image data of each layer of the imaging areas at the temperature imaging moments by a parallel imaging algorithm according to the aliasing signal data; and calculating and obtaining temperature image data of each layer of the image areas at the temperature imaging moments by a temperature algorithm according to the magnetic resonance image data of each layer of the imaging areas at the temperature imaging moments. A lot of temperature imaging moments include an initial temperature moment before temperature changes, and the temperature image data include temperature difference between the temperature imaging moment after the temperature changes and the initial temperature moment. According to the magnetic resonance temperature imaging method and system, temperature imaging efficiency can be improved.

The invention discloses an ultra-fast single-excitation four-point Dixon water-fat separation imaging method. Single-excitation water-fat separation sequences and data processing modes of multiple versions are adopted, and the method is mainly used for enhancing the signal to noise ratio and increasing the scanning speed to obtain a same-phase diagram, a reverse-phase diagram, a water image and a fat image in which the field asymmetry effect is eliminated and obtain a field distribution diagram delta B0 and a precise distribution diagram (please see the formula in the description). Fast scanning is guaranteed, and meanwhile the clinical diagnosis needs of infants and restless patients are met.

The invention discloses an optical excitation and ultrasonic excitation combined infrared nondestructive testing device. The device comprises a computer, a control cabinet, an excitation system and an infrared thermal imager, wherein the computer is connected with the infrared thermal imager and the control cabinet respectively; the computer is used for controlling the testing process and analyzing the testing result; the control cabinet is connected with the computer, the excitation system and the infrared thermal imager respectively; the control cabinet is used for controlling signal conversion and providing a power supply required by the excitation system; the excitation system is used for applying optical excitation and ultrasonic excitation to a tested sample; the infrared thermal imager is used for recording the temperature field change of a tested surface. In combination of the testing result obtained in different excitation manners, the defect testing accuracy and sensitivity are improved, the defect of poor detectability in a single excitation mode is overcome, false testing and missing testing are reduced, and the infrared nondestructive testing application range is enlarged.

The invention provides water-soluble red/green light double-emission carbon dots (RGDE CDs) which are prepared by taking 2,5-diaminotoluene sulfate as a carbon source through a one-step method. Compared with an existing method, a multi-step material preparation process is avoided. The RGDE CDs prepared by the method have excellent anti-photo-bleaching capability, good biocompatibility and low cytotoxicity. Under the single excitation wavelength, the strength of green fluorescence (with the wavelength of 525nm) of the RGDE CDs is quenched after OONO- is added, and the strength of red fluorescence (with the wavelength of 603nm) is basically not changed. On the basis, the invention establishes a novel method for determining fluorescence of the OONO- through a ratio method.

The invention provides a single-excitation double-emission carbon-based biomass dot as well as a preparation method and application thereof. The preparation method comprise S1, a proper number of clean Chinese cabbage leaves are weighted, and are ground in a utensil; S2, after absolute ethyl alcohol and an acetone solution according to the volume ratio of 1:0.9 to 1:1.1 are added, and then the mixture is uniformly mixed for being soaked; S3, after being soaked for 28-32 minutes, filtering is conducted to obtain a chlorophyll extracting solution; S4, 25 mL of chlorophyll extracting solution proportional to 0.1g-0.11g of polyoxyethylene diamine are added in a polytetrafluoroethylene reaction kettle, and mixing and heating are conducted for 9-11h under the temperature controlled to be 195-205DEG C; S5, after cooling to the room temperature is conducted, suction filtration is conducted, and a filtrate is adjusted to that with a pH value roundly equal to 7; and S6, the filtrate is transferred into a dialysis bag for lucifugal dialysis for 11-13h to obtain the single-excitation double-emission carbon-based biomass dot. According to the dot and the preparation method and application thereof, the carbon-based biomass dot can be directly used as a probe for ratiometric fluorescence imaging of active substance coenzyme A in cells, the background fluorescence interference of biological tissue can be eliminated, and the accuracy and the sensitivity of the fluorescence imaging of the coenzyme A can be improved.

A single detector based spectroscopy system using FAST (fiber array spectral translator) fibers and two excitation sources in conjunction with a holographic spectrum analyzer (HSA) to obtain simultaneous and selective display of spectroscopic regions of interest. A sample can be illuminated with different laser excitation wavelengths and resulting multiple spectra can be comparatively observed on a single display screen for more fruitful analysis of sample spectral responses (and, hence, sample chemical or physical properties) under different excitations. The HSA may be configured to focus on user-selected spectral regions of interest from different such spectra and a single CCD detector may be configured to collect spectral data from all selected spectral regions of interest in corresponding portions of the CCD pixel array, thereby allowing subsequent simultaneous display of such selected spectral regions of interest. The HSA may also allow simultaneous collection and display of portions of a single spectrum from a single excitation wavelength. A user can perform better comparative analysis when spectral regions of interest are juxtaposed with each other on a single electronic display.

The invention discloses a single-excitation longitudinal-twisted compound vibration converting device comprising a first converter and a second converter, wherein one end of the first converter and one end of the second converter are matched by abutting and pressing through a mode of a tenon-and-mortise structure, and an axial fixing mechanism is also arranged between the first converter and the second converter. The single-excitation longitudinal-twisted compound vibration converting device has a reasonable design, a simple structure, strong practicability and extensive market prospect, is easy to realize longitudinal-twisted compound vibration, can be applied to the field of ultrasonic compound processing and is easy to popularize and apply.