83 results about "Doppler ultrasonics" patented technology

A parturient procedure monitor system is composed of three ultrasonic sensors with emitting-receiving function for measuring the cervix expansion and the position of infantile head, three receiving ultrasonic sensor, pressure sensor, Doppler ultrasonic probe, ultrasonic signal driving and demodulating unit, calculating processor, uterine contraction pressure detecting and converting unit, ultrasonic infantile cardiorhythm detecting-D/A converting-calculating unit, and background processing-displaying and printing unit. Its method is also disclosed.

The invention discloses a method and system for simultaneously displaying a Doppler image, a B-type image and a colored blood flow image. The method comprises the steps of: sending B-type scanning pulses and Doppler scanning pulses at an interval according to a time sequence; receiving ultrasonic echoes of the scanning pulses and converting into electric signals; carrying out B-type signal beam synthesis on B-type ultrasonic echoes, and carrying out Doppler signal beam synthesis on Doppler ultrasonic echoes; transmitting the signal obtained after the B-type signal beam synthesis to a B-type signal processing module to obtain B-type image data; dividing the signal obtained after the Doppler signal beam synthesis into two parts, carrying out Doppler signal processing on one part to obtain Doppler frequency spectrum data, and carrying out colored blood flow signal processing on the other part to obtain colored blood flow image data; and transmitting the B-type image data, Doppler frequency spectrum data and colored blood flow image data to a display module for synchronously displaying. The method and system disclosed by the invention have the advantages that: Doppler, B-type and colored blood flow images can be simultaneously displayed under the condition of not increasing extra emission.

In a Doppler ultrasonic flowmeter, to obtain a precise flow rate a flow rate calculation equation that corrects a quantization error occurring to a spatial resolution is used. An ultrasonic transducer transmits/receives ultrasonic pulses, and subject the resulting received signals to A/D conversion after a predetermined process is applied thereto. A computation control section calculates the flow velocity distribution. Then, the flow rate is calculated based on the flow rate calculation equation, which corrects the quantization error occurring to the spatial resolution.

A doppler ultrasonic flowmeter 10A includes: a Udflow unit 13 for calculating the speed of a great number of reflectors 25 contained in a fluid 12 to be measured; a flow-speed distribution calculating element 70 for calculating the flow-speed distribution of the fluid 12 to be measured within a fluid tube 11 by performing computation processing for the flow-speed data of the reflectors 25 received from the Udflow unit 13; a center position detecting element 71 for detecting the center position of the fluid tube 11; a flow-speed distribution calculating member 67 having an area selecting element 72 which allows the user to select a division area within the fluid tube 11 in units of the division area; the flow-speed distribution being calculated for the selected division area using the reflectors 25; and a flow calculating member 68 for measuring the flow by further performing computation processing for the flow-speed distribution of the fluid 12 to be measured. Furthermore, the doppler ultrasonic flowmeter 10A includes a display monitor 39 for displaying the calculation results output from at least one of the flow-speed distribution calculating member 67 and the flow calculating member 68. The present invention having such a configuration provides a doppler ultrasonic flowmeter, a flow measurement method, and a flow measurement program, having the advantage of enabling measurement of the flow-speed distribution and measurement of the flow, regardless of irregularities in the measurement results of the flow-speed distribution.

A Doppler type ultrasonic flowmeter has an ultrasonic transmitting means for emitting ultrasonic pulses from an ultrasonic transducer into a fluid pipe, a flow velocity profile measuring means for receiving an ultrasonic echo reflected from a measurement region in the fluid pipe thereby to measure a flow velocity profile of a fluid to be measured, a fluid flow rate computing means for calculating the flow rate thereof on the basis of the flow velocity profile of the fluid to be measured, and a frequency selecting and setting means for automatically selecting a fundamental frequency of an ultrasonic wave that causes a resonant transmission phenomenon to take place from the ultrasonic transducer. The frequency selecting and setting means controls the operation of the ultrasonic transmitting means such that an ultrasonic wave of a selected optimum frequency is emitted from the ultrasonic transducer. This arrangement makes it possible to provide a highly versatile Doppler type ultrasonic flowmeter that permits simple, easy, contactless, precise and highly accurate measurement of the flow rates of fluids to be measured that are flowing in various fluid pipes.

The invention discloses an ultrasonic guided out-of-plane puncture method. The method comprises the steps: (1) a user directly measures a longitudinal distance y between a target point to be puncturedand skin through an ultrasonic probe and a Doppler ultrasonic diagnosis apparatus; (2) the user measures a transverse distance x between an ultrasonic guided out-of-plane puncture frame and the center of the ultrasonic probe directly through a staff gauge; (3) the user directly calls a background dedicated computing module of the Doppler ultrasonic diagnosis apparatus, the longitudinal distance yand the transverse distance x are input, and a puncture distance L and a puncture angle alpha are obtained through computing; and (4) the Doppler ultrasonic diagnosis apparatus generates a puncture guiding path according to the computed puncture distance L and the puncture angle alpha, and a puncture needle performs accurate puncture according to the puncture guiding path. The method has the beneficial effects that operating personnel can intuitively observe a prospective puncture path and target point of the puncture needle, so that the operating personnel can perform accurate puncture according to a specific position of a nidus, the occurrence of a problem of mistaken puncture is avoided, and the working efficiency is increased; and misplay of the operating personnel is avoided, and theaccuracy of information extraction and puncture path planning of the puncture needle is improved.

The application mode of execution discloses a while-drilling gas cut simulated experimental device and an experimental method. The device comprises a gas-liquid conveying mechanism, a shaft simulated experimental mechanism and a data processing mechanism. The gas-liquid conveying mechanism comprises a gas-liquid mixer, a gas branch road and a mud branch road, wherein the gas branch road and the mud branch road are connected with the gas-liquid mixer, the gas branch road comprises a gas compressor and a gas storage tank which are mutually connected in sequence, and the gas storage tank is connected with the gas-liquid mixer; the mud branch road comprises a mud tank, a heater and a plunger pump which are mutually connected in sequence, and the plunger pump is connected with the gas-liquid mixer; the shaft simulated experimental mechanism comprises a Doppler ultrasonic theory experimental section and an underground overflow simulated test section; and the data processing mechanism comprises a front-end amplifier, a modulus collector and a computer which are connected in sequence, and the front-end amplifier is connected with the shaft simulated experimental mechanism. The technical scheme of the while-drilling gas cut simulated experimental device and the experimental method can provide data support for detecting gas cut precisely and timely.

The invention relates to a liquid surface tension testing method based on mechanical vibration of a liquid droplet. The method specifically comprises the following steps: placing a hydrophobic substrate on a Doppler ultrasonic probe, and generating a liquid droplet on the hydrophobic substrate; vibrating a triggering device to freely vibrate the liquid droplet; converting free vibration of capillary waves on the surface of the liquid droplet into an ultrasonic Doppler frequency shift signal through the ultrasonic probe by using a non-focusing continuous wave Doppler method, and amplifying theultrasonic Doppler frequency shift signal; acquiring a free vibration characteristic diagram of the liquid droplet from the ultrasonic Doppler frequency shift signal by using a computer signal processing module, performing Fourier transform so as to obtain a vibration frequency characteristic diagram, analyzing the vibration frequency characteristic diagram, and reading frequency of a second harmonic generation peak; by taking the reciprocal of the mass of the liquid droplet as a transverse coordinate, and the square of the frequency of the second harmonic generation peak as a longitudinal coordinate, drawing diagrams, fitting straight lines, calculating a straight slope, and further calculating the surface tension of the liquid droplet. The method based on ultrasonic Doppler frequency shifting is capable of carrying out frequency measurement on ultrasonic signals, and has the advantages of reagent conservation, high performance cost ratios and portability.

A bubble generator to bring out performance of a Doppler ultrasonic flowmeter to the maximum extent is provided. The bubble generator is provided with a bubble generation member generating bubbles suitable for a predetermined frequency of an ultrasonic pulse emitted into a fluid to be measured and feeding the bubbles into the fluid pipe, and a uniform dispersion member dispersing the bubbles fed uniformly in the pipe, the bubble generator is installed on an upstream side of the fluid pipe with respect to an ultrasonic transducer. The bubble generation member has a Venturi tube, and the uniform dispersion member has a negative pressure generating device, in which the fluid to be measured drawn out by the uniform dispersion member from inside the fluid pipe is returned into the fluid pipe together with the bubbles fed into the fluid pipe via the Venturi tube.

The invention discloses a flexible speed measuring device for Doppler ultrasonic detection and application of the flexible speed measuring device, and belongs to the technical field of ultrasonic speed measurement. The flexible speed measuring device for Doppler ultrasonic detection comprises an ultrasonic phased array probe, a flexible packaging layer and a probe driving circuit; the flexible packaging layer wraps the ultrasonic phased array probe; the ultrasonic phased array probe consists of a plurality of ultrasonic transduction units in an array mode; the probe driving circuit changes theemission frequency of the ultrasonic transduction units in the ultrasonic phased array probe through sequential control, so that ultrasonic waves excited by the ultrasonic transduction units are superposed to form a new ultrasonic beam, and the ultrasonic beam is focused at the position of a fluid to be measured; and the ultrasonic phased array probe collects the reflected ultrasonic waves to obtain frequency data for speed measurement. According to the flexible speed measuring device, the ultrasonic focusing position can be regulated and controlled, frequency change information is obtained through array mapping transformation, the biological blood flow speed is measured based on a flexible ultrasonic array, and good comfort degree and large attachment angle freedom degree are achieved.

The invention discloses a method for automatically positioning a sampling frame via Doppler ultrasonic wave. A sampling frame is automatically positioned by a Doppler ultrasonic system according to image information. Positions of the sampling frame can be automatically set and adjusted according to imaging data, so ultrasonic imaging equipment can quickly find a position with rich blood flow information, and therefore blood vessel check time can be reduced and operation for Doppler ultrasonic measurements by an operator with less experience can be facilitated; when the same part is checked foreach person to be checked, standards can be built; the algorithm can be combined with artificial intelligence, so automatic scanning can be realized; and automatic check becomes possible.

The invention discloses a method and a device for improving HPRF (High-Pulse Repetition Frequency) performance in Doppler ultrasonic imaging, wherein the method comprises the following steps of: an acquisition step for acquiring PRF gear selected by a user, the depth of a sampling door and the size of the sampling door by an interactive interface; a setting step for setting a selectable PRF range according to a standard PRF value corresponding to the selected PRF gear; and a scoring step for selecting the PRFs in sequence according to the preset step length in the selectable PRF range so as to carry out scoring, wherein the PRF with the largest score is taken as the optimum PRF of the selected gear and the optimum PRF is used for transmitting ultrasonic pulse. According to the method and the device disclosed by the embodiment of the invention, the optimum PRF is calculated in real time according to the PRF gear selected by the user and the position of the sampling door so as to carry out transmission, and the signal-to-noise ratio of a Doppler frequency spectrogram obtained under HPRF can be improved, so that the imaging effect of Doppler frequency spectrum can be improved.

The invention relates to a color-Doppler-ultrasonic-scanning-based antitheft system, which comprises a center control module, a power module, a Doppler ultrasonic scanning device, a data transmission module, a storage module and an electronic lock, wherein the power module, the Doppler ultrasonic scanning device, the data transmission module and the storage module are connected with the center control module; the Doppler ultrasonic scanning device is used for acquiring the blood flow state information of a specific part of a human body, and generating a color Doppler ultrasonic data graph; the data transmission module is used for transmitting information from the center control module; the storage module is used for storing a Doppler ultrasonic data graph; the electronic clock is connected with the data transmission module, and is turned on and off by an electrical signal; and the center control module instructs the turning-on and turning-off of the electronic lock under the condition that the color Doppler ultrasonic data graph generated by the color Doppler scanning device is matched with the Doppler ultrasonic data graph in the storage module. An identification model of the color-Doppler-ultrasonic-scanning-based antitheft system is based on a subepidermal internal structure of the human body, and has high non-duplicability, so that a criminal can hardly counterfeit the characteristics of the human body, and the identification accuracy, safety and reliability of the antitheft system are improved.

The invention provides a Bluetooth-based full-digital Doppler fetal heart wireless probe and a detection method. The Bluetooth-based full-digital Doppler fetal heart wireless probe comprises a Doppler fetal heart wireless probe body, a circuit board, an MCU control chip, a Bluetooth module, a CPLD/FPGA digital demodulation module and a Doppler ultrasonic probe, wherein the circuit board is arranged in the Doppler fetal heart wireless probe body; the MCU control chip is arranged on the circuit board; the Bluetooth module is arranged on the circuit board and used for transceiving data and instructions in a wireless manner; the CPLD/FPGA digital demodulation module is arranged on the circuit board and used for generating ultrasonic pulse excitation signals and is connected with the MCU control chip; and the Doppler ultrasonic probe is used for generating corresponding ultrasonic pulses according to the ultrasonic pulse excitation signals and capturing ultrasonic echoes and is connected with the CPLD/FPGA digital demodulation module. In the invention, the digital demodulation algorithm, CPLD/FPGA, MCU control chip, Doppler ultrasonic probe and Bluetooth module are integrated to form an interactive digital demodulation wireless ultrasonic Doppler fetal heart probe with high integration and low cost.

The invention discloses a method capable of repelling birds from electrical equipment in time. A bird repelling device main unit, a Doppler ultrasonic detector and a 360-degree monitoring camera are installed on a bird repelling site for the electrical equipment, the Doppler ultrasonic detector conducts continuous all-dimensional scanning-type detection on the periphery of the electrical equipmentfor 24 hours, the bird repelling device main unit is connected with a lithium battery, the Doppler ultrasonic detector, a red-green LED lamp, a bird repelling horn, the 360-degree monitoring camera and a background server separately, the lithium battery is connected with solar energy, and the background server is connected with a C/S computer user side and an APP mobile phone user side separately. According to the method, by adopting a Doppler detection ultrasonic detection technology, a voice threatening and red-green strong light stimulation technology capable of supporting remote downloading, a low-power-consumption bird repelling technology for timing triggering and alarm triggering of bird repelling, an H.265 high-definition video monitoring technology, a 4G wireless communication technology, a solar environment-friendly power supply technology and a mobile phone APP remote control technology, a novel ultrasonic bird repelling device with an environment-friendly, safe and remotely-controllable power grid is developed.