426 results about "Ultrasonic excitation" patented technology

The invention relates to a nondestructive testing method of a concrete structure, which comprises the steps: based on the original infrared imaging system, an ultrasonic excitation source is additionally arranged on a tested object; after the ultrasonic excitation source is used, infrared pulse excitation continues to be adopted for combining ultrasound damage location with infrared depth analysis, which protects the tested object, avoids detection of the whole thermography area, aims at detection of the determined image processing area, and is beneficial to improving the detection efficiency; and then, a standard part is adopted for sample detection, and the depth information of the tested object is reversely deduced. The nondestructive testing method is feasible, and has low requirement on precision of detection apparatuses.

The invention relates to an ultrasonic, vortex and EMAT integrated lossless thickness tester and a method thereof. The ultrasonic, vortex and EMAT integrated lossless thickness tester comprises an excitation module, a receiving pre-processing module, an analog switch, an A/D converter, a self-checking module, an MCU, a CPU module, a power supply module and a CPU periphery display storage part, wherein the excitation module is connected with the receiving pre-processing module, the receiving pre-processing module is connected with the analog switch, the analog switch is connected with the A/D converter, the A/D converter is connected with the MCU, the self-checking module is connected with the MCU, and the excitation module comprises an ultrasonic excitation module, a vortex excitation module and an EMAT excitation module; the receiving pre-processing module comprises an ultrasonic receiving pre-processing module, a vortex receiving pre-processing module and an EMAT receiving pre-processing module. The comparability of a measurement result is increased through the integration of the ultrasonic, the vertex and the EMAT, the misjudgment rate caused by measurement through a single method is reduced, and meanwhile the limitation of measurement through the single method is overcome.

The invention provides an optical acoustic ultrasound excitation and induction integrated detection device. An acoustic insulating layer, a sound absorption pad, a miniaturized semiconductor laser tube, a Fourier lens, a cylinder lens, a protection film and an annular multi-ring array sensor are all arranged in casing of the detection device and at same axle wire to form an integrated coaxial confocal structure. The multi-ring array sensor can generate ultrasonic signal, receive ultrasonic echo signal and receive optical acoustic signal by time-sharing excitation to realize optical acoustic ultrasound single or combined detection of A-type dynamic scan. The detection device has advantages of integrating excitation and induction of optical acoustic ultrasound, greatly increasing excitation and induction efficiency optical acoustic ultrasound, effectively reducing laser energy demand, increasing detection depth, and having high measurement sensitivity, simple operation and low cost. The detection device can be widely applied in fields of blood oxygen detection, blood sugar detection, HIFU therapy and effect monitoring, industrial crack detection and so on.

The invention discloses a method for reducing a working blind zone of an ultrasonic transducer on the basis of excitation energy control. After an ultrasonic flow or object position measuring instrument is started or reset, the instrument sets an ultrasonic exciting pulse to generate an ultrasonic exciting signal, wherein the ultrasonic exciting pulse has excitation energy, and the number of the ultrasonic exciting pulse is one less than the number of the ultrasonic exciting pulse required for generating an ultrasonic exciting signal with a plateau characteristic; an ultrasonic echo signal corresponding to the ultrasonic exciting signal is utilized to measure the flow or object position; when the flow or object position is not changed, measurement is respectively carried for more than two times; a measurement result is compared with a preset value; ultrasonic excitation energy is regulated in a self-adaption mode by a result obtained by comparing the measurement result with the preset value so as to control the residual energy of the ultrasonic transducer; the working blind zone of the ultrasonic transducer is reduced; and the measurable acoustic-path range of the ultrasonic is widened.

The invention discloses a focused ultrasonic noninvasive sound powered tumor therapy system. The system is characterized in that: a photosensitizer and an ultrasonic micro bubble contrast medium are used as tumor therapy media, the photosensitizer and the ultrasonic micro bubble contrast medium are injected respectively before a patient is treated, an ultrasonic diagnosis probe is used for detecting a therapeutic part and performing stereo positioning, and a multi-frequency focused ultrasonic transducer is used for transmitting low-power multi-frequency ultrasonic to excite the photosensitizer to generate photochemical reaction in the tumor cells and induce the ultrasonic micro bubble contrast medium to generate an acoustic cavitation effect around the tumor tissues, so that tumor microcirculation embolism is caused, tumor cell transfer is prevented, and the system plays a good role in noninvasive tumor therapy.

An ultrasonic excitation method for eliminating the crosstalk of a robot ultrasonic ranging system adopts the pseudo-random pulse position modulation mode for constructing a sole transmitting sequence for each ultrasonic transducer and uses the genetic optimization algorithm for optimizing the time interval between the adjacent pulses in the pseudo-random pulse position modulation sequence, thus allowing the duration of the transmitting sequence of each ultrasonic transducer to be 1.5 to 2ms. The ultrasonic excitation method comprises the following steps: 1. a string of pulse signals X are generated; 2. K groups of different pseudo-random series Psi are generated; 3. the pulse positions in the pulse signals X are respectively modulated by using the K groups of pseudo-random series, thus obtaining K groups of pseudo-random pulse position modulation sequences; 4. the best pseudo-random pulse position modulation sequence of the K groups is obtained; 5. K groups of ultrasonic transducers are respectively excited. The ultrasonic excitation method can lead each ultrasonic transducer to have the sole transmitting sequence, thus fundamentally avoiding the occurrence of the crosstalk; the real-time requirement of the robot navigation can be ensured; the working efficiency of a robot ultrasonic obstacle avoidance system can be effectively improved; and the reliability of the robot ultrasonic obstacle avoidance system can be greatly improved.

The invention discloses an optoacoustic and ultrasonic bimodal endoscope imaging system. The optoacoustic and ultrasonic bimodal endoscope imaging system is composed of an endoscope lens, a light source, a controlling and processing device, an impulse voltage generator, an interface module, a cable, a display screen, a crystal oscillator circuit and a power circuit. The optoacoustic and ultrasonic bimodal endoscope imaging system can achieve endoscopic type optoacoustic and ultrasonic bimodal imaging. According to the optoacoustic and ultrasonic bimodal endoscope imaging system, a high density CMUT ring array manufactured by using surface micro fabrication technology is used, an excitation unit and a sensing unit are designed into coaxial and homocentric integrative microstructure, and integration, microminiaturization and practical performance of optoacoustic and ultrasonic excitation and sensing are achieved. The optoacoustic and ultrasonic bimodal endoscope imaging system can be widely used in fields of medical endoscopic diagnosis, jewelry identification, industrial inspection and flaw detection and the like.

The invention relates to a laser ultrasonic detection apparatus, belonging to the technical field of laser ultrasonic detection. The apparatus comprises a detection laser source, a front light-splitting structure, a collecting structure, a double-photorefractive lens, (a) polaroid(s), (a) detector(s), a half-wave plate, a front polarization splitting prism, an acoustic-optical modulator, a back polarization splitting prism, a back light-splitting structure, a detected piece, a laser ultrasonic excitation source, a beam-expanding structure, a bidirectional tunable aperture and a focusing mirror. The apparatus is capable of carrying out wide-range laser ultrasonic detections and the speed of the laser ultrasonic detection can be greatly raised. A linear ultrasonic excitation source is adopted to carrying out the excitation, enabling ultrasonic fields of each monitoring point to have the same distribution, and thus solving the problem that the ultrasonic intensity at each collecting point is inconsistent with each other when circular laser spots are adopted to excite the ultrasound. The apparatus has fast surface-scanning speed and high detection efficiency, and is very practical.

The invention discloses an endoscopic fluorescent ultrasonic fusion radiography navigation system which comprises a multi-spectral light source, a high-frequency ultrasonic excitation module, an endoscopic detector module and an information processing module. The endoscopic detector module comprises an ultrasonic probe and an optical probe, the optical probe is used for irradiating tissues of openorganisms to obtain fluorescence images of specific tissue positions and transmitting the fluorescence images to information processing module, the high-frequency ultrasonic excitation module is usedfor transmitting multi-frequency ultrasonic, the ultrasonic probe is used for ultrasonically detecting pathological tissues to obtain continuous two-dimensional ultrasonic images of the pathologicaltissues and transmitting the continuous two-dimensional ultrasonic images to the information processing module, and the information processing module performs 3D (3- dimensional) registration and fusion on the continuous two-dimensional ultrasonic images to obtain 3D ultrasonic images of the pathological tissues. According to the system, whole probing of the pathological tissues or tumors can be achieved by the aid of fluorescent ultrasonic fusion radiography, and clinical application requirements are met.

The invention discloses a method for pressure detection of a pressure container and based on reflected P-waves and a measuring system. The measuring system comprises the cylindrical pressure container, a manual booster pump, a thermostat, an ultrasonic excitation and receiving device, a high-speed oscilloscope and a computer. The fundamental principle of the method for pressure detection is characterized in that based on the ultrasonic sound elastic principle and the theory of plates and shells, after deduction and simplification, a pressure measuring model based on the reflected P-waves is established, and in other words, the relation between the internal pressure of the pressure container and ultrasonic propagation time delay is acquired; then accurate propagation time delay is acquired based on an FIR digital filter and a cross-correlation algorithm; finally in order to reduce temperature interference, a measuring model with the temperature compensating function is provided, and pressure measuring errors are controlled within a small range. The measuring result shows that compared with other similar measuring methods, flexibility and accuracy are higher, and interference resistance is stronger.

The present invention discloses a smart structural health monitoring device. The device is an intelligent sensor device mounted onto or near the structure to be monitored. The device includes an actuating unit that generates acoustic or ultrasonic excitation signals across the structure, a sensor unit that receives the structure's responses to the excitation signals and generates corresponding sensor data, a processing unit that determines the structure's structural health (e.g., structural change, structural defect, structural damage) by processing the sensor data with analytics algorithms. The smart device also includes at least a non-volatile memory (e.g., Flash memory) for storing the structural health information and sensor data. Such a smart structural health monitoring device is capable of independently determining the structural changes and damages. And multiple smart structural health monitoring devices can be used for monitoring one or more structures at the same time. A remote management console is used to configure, schedule, coordinate, and control the devices through a network. Each device transmits the results of structural changes and damages to the remote management console through according to a schedule or upon request.

The invention relates to an ultrasonic imaging device and method. The device comprises a motion control platform used for controlling the image scanning path, an amplitude modulation ultrasonic transmitting system used for transmitting ultrasonic excitation signals, a data acquiring and processing system used for receiving and processing echo signals, a computer imaging and displaying system used for reconstruction imaging of echo signals which are fed back, and an ultrasonic transducer used for sending and receiving ultrasonic waves acting on a phantom. The device and method have the advantages that more contrast medium microbubbles are adsorbed by the vascular wall through radial force generated after the amplitude modulation ultrasonic transmitting system acts on low-frequency ultrasound transmitted by the ultrasonic transducer, the imaging signal intensity of tissue is improved, high-resolution ultrasonic imaging is achieved through a high-frequency component, the imaging resolution ratio and the imaging depth are both considered, and a clearer image is provided for ultrasonic diagnosis.

The embodiment of the invention provides an ultrasonic excitation device, method and system. The ultrasonic excitation device comprises a waveform generator, a power amplifier, and an ultrasonic transducer array. The waveform generator is used for obtaining the ultrasonic excitation parameters of all channels, and then generating a waveform excitation signal of each channel according to the ultrasonic excitation parameters. The power amplifier is electrically connected with the waveform generator, and is used for carrying out the power amplification of the power amplification, and generating ahigh-voltage drive signal and inputting the high-voltage drive signal into the ultrasonic transducer array. The ultrasonic transducer array is used for generating ultrasonic waves on the corresponding elements according to the high-voltage drive signal, and comprises a plurality of elements, wherein each element is corresponding to one channel. Therefore, the device can give full display to the performances of the ultrasonic transducers, and obtains the better ultrasonic mechanical effect and thermal effect.

The invention relates to a measuring method and a measuring device for liquid drop particles in a wet-steam region. An ultrasonic excitation signal acquires ultrasonic signals with three different frequencies by adopting a mode of superposing waves; the processing and analyzing process of the ultrasonic signals in a computer comprises the following steps: performing fast Fourier transform on the obtained signals to obtain ultrasonic signal amplitudes with three frequencies, and calculating to obtain sound attenuation coefficients; obtaining particle diameter values of the liquid drop particles according to the relationship between the measured particle diameter values of the liquid drop particles and the ratio of the sound attenuation coefficients with three frequencies; likewise, obtaining a volume concentration value according to the relationship between the volume concentration value and the sound attenuation coefficients, and obtaining a humidity value of wet steam according to the conversion relationship between the volume concentration and the humidity. The measuring device is simple in structure and low in cost; compared with the measuring method for the wet steam by adopting other principles, the measuring method disclosed by the invention has the advantages that ultrasonic waves have strong penetrating power; an ultrasonic transducer can normally work in a severe environment; online measurement of particles sizes, volume concentration and humidity of the liquid drop particles in the wet steam region with higher concentration at the final stage of a low-pressure cylinder can be realized without precision correction.

The invention discloses an ultrasonic physiotherapy instrument based on frequency automatic tracking. The instrument comprises a microcontroller, a signal generation module, a power amplification module, an impedance matching module and a frequency tracking module. The frequency automatic tracking system adopts a closed loop feedback tracking system; in the working process of an ultrasonic power supply system, the frequency tracking module acquires voltage signals and current signals at two ends of an ultrasonic transducer in real time, converts the signals into a fourth driving signal, and sends the fourth driving signal to the microcontroller so as to output a pulse signal to a fuzzy controller for self-adaptive adjustment; and finally, the pulse signal subjected to self-adaptive adjustment is treated by a DDS circuit, an ultrasonic excitation signal is output, a first driving signal is output through a shaping filter circuit, a second driving signal is output through a duty ratio adjusting circuit, a high-stability and high-precision ultrasonic excitation signal is output through the power amplification module, and a voltage signal and a current signal are output through the impedance matching module, so that the signal output frequency is gradually keeps consistent with the input frequency.

The invention discloses an electrical impedance imaging method of an ultrasonic-synergy biological tissue. The electrical impedance imaging method comprises that a plurality of electric excitation leads and detection guide leads are arranged on the surface of the biological tissue, and an ultrasonic excitation source is adopted to generate ultrasonic waves and the ultrasonic waves are focused in the biological tissue through ultrasonic drive; the ultrasonic waves focused in the biological tissue are located in a continuous mode, and integral or partial scanning to the biological tissue is finished; signals are collected, the ultrasonic waves are focused at a certain spatial position, and a high-frequency signal corresponding to electrical impedance of the spatial position is generated, the signals are collected through the multi-channel detection leads, amplified, filtered, and then output; after focusing and scanning of the ultrasonic waves are finished, a voltage signal after being collected is guided in a computer, and a signal is obtained according to the collected integral scanning and partial scanning to the biological tissue, and electrical impedance distribution of the biological tissue is calculated and rebuilt. Through the electrical impedance imaging method of the ultrasonic-synergy biological tissue, a high-precision and high-resolution electrical impedance image can be obtained.

The invention discloses an online ultrasonic array detection system for surface defects of a fan spindle. The system comprises a computer, a router, an ultrasonic excitation receiving device, a multichannel gate and piezoelectric sensors, wherein the piezoelectric sensors are arranged on the end surface of the spindle in an array and used for detecting the surface defects of the spindle; the computer sends a detection instruction to the ultrasonic excitation receiving device through the router, the ultrasonic excitation receiving device controls the multichannel gate to sequentially gate and excite piezoelectric array elements in the piezoelectric sensor array, receives echo signals from the piezoelectric array elements and wirelessly transmits the echo signals back to the computer through the router, and thus, detection is realized. The problem about online detection of the surface defects of the fan spindle is solved, and wireless and remote ultrasonic array detection of the surface defects of the spindle is realized.

The invention relates to an instant heat ultrasonic micro-spray device which comprises an ultrasonic micro-nozzle, an ultrasonic excitation power supply and a liquid inlet pipe used for supplying liquid to be atomized for the ultrasonic micro-nozzle. The instant heat ultrasonic micro-spray device is characterized by also comprising a heater which is arranged on the liquid inlet pipe and is used for heating the liquid to be atomized. For adopting an instant heating and heat insulation device, the invention can reduce the viscosity of large-viscosity liquid to satisfy the requirement of liquid atomization; and because of the design of a high-density nozzle array, droplets with uniform diameter can be obtained, and the adaptation range of the liquid atomization is increased.

The invention relates to an ultrasonic excitation impact space sampling drill. The device mainly comprises an ultrasonic transducer, a pressurizing and clamping surface, a free mass and a drill rod. When a high-frequency AC excitation voltage is supplied to the ultrasonic transducer, the ultrasonic transducer generates longitudinal resonance due to the inverse piezoelectric effect of piezoelectric ceramics, and the variable-amplitude rod at the front end of the ultrasonic transducer amplifies ultrasonic amplitude. The free mass generates high-frequency reciprocating collision between the tail end of the clamped variable-amplitude rod and the drill rod under the excitation and vibration coupling actions of the ultrasonic transducer. The collision impact of the free mass and the vibration of the ultrasonic transducer are transferred to rock via the drill rod. When the impact strength is greater than the crushing strength of the rock, the rock is crushed. Compared with the ultrasonic space sampling drill without pressurizing cylinder surface thread connection, the ultrasonic excitation impact space sampling drill has high impact energy transfer rate, a corresponding axial force is applied according to rock hardness so as to improve the sampling drilling efficiency, and the drill has simple structure, light weight and low power consumption.

The invention relates to an ultrasonic stress relieving method. The method comprises the steps that an ultrasonic transducer is connected to a wave guiding rod, the wave guiding rod is fixedly connected to a processed component, and a vibration system is composed of the ultrasonic transducer, the wave guiding rod and the processed component which are sequentially connected; an ultrasonic drive power source carries out frequency scanning on the vibration system, the vibration frequency, closest to the resonance frequency of the ultrasonic transducer and highest in amplitude, of the vibration system is selected as the excitation frequency, and ultrasonic excitation treatment is carried out on the processed component; frequency tracking is carried out on the vibration system, and the resonance state of the vibration system is maintained; and frequency modulation is carried out on the excitation frequency output by the ultrasonic drive power source, at least one resonance modal forming the coupling relationship with a modal corresponding to the resonance frequency of the vibration system is excited, and simultaneous excitation of a plurality of resonance modals is achieved. The invention further relates to an ultrasonic stress relieving system.