84 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 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.

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 relates to a wireless fetal heart monitoring device, which comprises an ultrasonic sending module, an ultrasonic transducer, an ultrasonic demodulation module and a wireless communication module, wherein, the ultrasonic transducer is driven by the ultrasonic sending module to generate ultrasonic waves, and an ultrasonic echo wave signal can be received by the ultrasonic transducer and the scoustoelectric transformation of the ultrasonic echo wave signal is performed, the processed ultrasonic echo wave signal is input into the ultrasonic demodulation module and the demodulation process is performed, the fetal heart beat signal is extracted and then transmitted to a wireless receiving device of the fetal monitoring computer by the wireless communication module. Because the structure combines the wireless communication technology with the Doppler ultrasonic wave drive as well as the demodulation technology ingeniously, the fetal heart beat signal collecting device and the monitoring computer are separated, and a gravida is not constrained by the monitoring computer anymore, thereby making the movement to be free and convenient.

The invention provides a method for recognizing ultrasonic spectrum enveloped peaks by combining cardiac sound, which comprises the following steps: synchronously acquiring cardiac output signals and cardiac sound signals in relevant positions of human bodies by simultaneously adopting a Doppler ultrasonic probe and a cardiac sound probe, and inputting the cardiac output signals and the cardiac sound signals into a computer for processing; combining the cardiac output signals and the cardiac sound signals by the computer to automatically analyze effective peaks, and enveloping the effective peaks; and then, computing cardiac output parameters and cardiac sound parameters. The invention can more effectively extract real peaks, simultaneously can acquire relevant parameters capable of reflecting cardiac functions by computing effective enveloped peaks, can effectively acquire multiple parameters of spectrum enveloped peaks, and can really reflect basic physical conditions and changes of cardiac functions of human bodies.

The invention relates to a dogging Doppler ultrasonic flow-velocity distribution device, by adopting which the ultrasonic wave sent out from the ultrasonic transducer arranged outside the pipeline is sent on the liquid to be measured in the pipeline to measure the distribution of the flow-velocity of the liquid. The principle of the device is a certain frequency of the ultrasonic wave is reflected by the reflector in the liquid, and due to the Doppler Effect, the frequency is changed according to the flow-velocity. The sound wave propagation wedge of the ultrasonic flow-velocity distribution device is arranged between the ultrasonic transducer and the pipeline. The frequency of the emitted ultrasonic wave is set different from a certain frequency with a wave refraction angle of 90 degrees of the Lamb wave patterns in the pipeline. The frequency is calculated from the angle of incidence of the ultrasonic wave from the wedge into the pipeline, the sound speed in the wedge, the sound speed of the S-wave and P-wave in the pipeline, and the thickness of the pipeline. In such a way, the transmission frequency and the angle of incidence into the pipeline in the ultrasonic flow-velocity distribution device are fully chosen, thus allowing for the high-precision measurement of the fluid flow-velocity or the flow.

The invention discloses a method and system for measuring pulse wave propagation speed. The method includes: measuring and recording artery pulse wave of a certain part of a human body by using Doppler ultrasound to obtain a Doppler ultrasonic signal strength-time map, measuring a time difference Delta t between a main peak descending branch end and a re-pulse wave start on the time map, calculating an artery total length L from a main artery root to a pulse wave measurement site according to the height H of a testee, pulse wave propagation speed S of the testee on this artery measurement section being equal to a ratio of L to Delta t. The invention provides a novel method of measuring artery pulse wave speed by using the method of measuring pulse wave signals using Doppler ultrasound, in the hope of providing theoretical and technical basis for further clinical application. In addition, the method is simple, operating is convenient, measuring accuracy is higher, and clinical level is partly increased.

A doppler ultrasonic flowmeter including: an ultrasonic transmission member for casting ultrasonic pulses onto the fluid within a fluid tube, which is to be measured, along a measurement line from an ultrasonic transducer, a flow-speed distribution measurement unit for receiving ultrasonic echoes reflected from the measurement region due to ultrasonic pulses cast onto the fluid to be measured so as to measure the flow-speed distribution of the fluid to be measured in the measurement region; a flow measurement unit for measuring the flow of the fluid to be measured; and a transducer position adjusting mechanism for adjusting the relative position of a pair of ultrasonic transducers serving as the ultrasonic transmission member, a first transducer and a second transducer, which are disposed away one from another along the axial direction of a fluid tube.

The invention relates to a processing method of using a Doppler ultrasonic flow meter to obtain water flow velocity signals. The Doppler ultrasonic flow meter comprises a computer, a controller, a receiver and a transmitter, wherein the receiver and the transmitter are respectively connected with the controller; and the computer is connected with the controller. The method comprises the following steps: the Doppler ultrasonic flow meter performs calculation through fast Fourier transform (fft) in a unit time of 20 to 40 milliseconds to obtain a flowing water spectrum graph; in the above flowing water spectrum graph, spectra in a range of f=f0-v / k are selected for analysis, and a flowing water spectrum capture and a spectrum local graph are obtained; weighted average is carried out on frequencies of all points in the above spectrum local graph to obtain the flow velocities of the above flow velocity points; and all the flow velocities are standardized to obtain the flow velocity of a flow velocity point in a measured time. The method can accurately find the flow velocity of the flow velocity point from various interference noise, and a flow velocity value with good stability is finally obtained.

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 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.

The invention provides a draining state monitoring system and method of an inspection shaft. The system comprises a data collection box, a monitoring data collection unit, a float ball switch and an installation support, wherein the data collection box is electrically connected with the float ball switch and the monitoring data collection unit, the upper end of the installation support is connected to the wall of the inspection shaft, the lower end of the installation support extends to a drain pipe, the monitoring data collection unit is arranged at the lower end of the installation support, the float ball switch is arranged on the wall of the inspection shaft, the monitoring data collection unit is used to measure the draining flow velocity, the draining temperature and the liquid level pressure information of the drain pipe, and the float ball switch sends a switching signal to the data collection box when the liquid level in the inspection shaft rises to the installation position of the float ball switch. A Doppler ultrasonic flow velocity meter is connected to the wall of the inspection shaft via the installation support instead of being immersed in the flow for a long time, the physical survivability is greatly improved, the reliability of measurement data is improved, and physical damages are reduced.

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 relates to a liquid viscosity test method based on liquid drop mechanical vibration. The method concretely comprises the following steps that a hydrophobic substrate is placed on a ultrasonic probe of a Doppler ultrasonic instrument; liquid drops are generated on the hydrophobic substrate through a microinjector; the liquid drops are vibrated through a vibration triggering device with an automatic rebounding function; then, the vibration triggering device rebounds; the liquid drops generate free vibration; the free vibration of liquid drop surface capillary waves is converted into ultrasonic wave Doppler frequency shift signals by a non-focusing continuous wave Doppler method through the ultrasound probe, and the signals are amplified; a computer signal processing module collects and processes the Doppler frequency shift signals to obtain a liquid drop free vibration characteristic pattern; the free vibration characteristic pattern is subjected to fitting to obtain the decay rate of the liquid drop amplitude along with the time; further, the liquid viscosity is obtained through calculation. When the method is used for measuring the liquid drop viscosity, the responsespeed is high; the application range is wide; the reliability is high; the equipment is portable; the cost performance is high; the reagent consumption is little.

The invention discloses a dynamic demodulation device of a Doppler ultrasonic imaging system, which comprises a digital beam forming module and an orthogonal demodulation module which are connected. The dynamic demodulation device also comprises a dynamic frequency orthogonal signal generation module, wherein the dynamic frequency orthogonal signal generation module is connected with the orthogonal demodulation module, and is used for generating a cosine local oscillatory signal and a sine local oscillatory signal of which frequencies are changed with a beam propagation time and transmitting the signals to the orthogonal demodulation module. The dynamic demodulation device of the Doppler ultrasonic imaging system in the invention can compensate the attenuation of ultrasonic echo signals in human tissue so as to reduce errors of Doppler frequency shift signals.

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 relates to a non-point source pollution control-based arterial drainage water quality regulation and control system and an arterial drainage water quality regulation and control method. The system comprises an arterial drainage which is divided into a plurality of control sections, a controller and a plurality of switching wells, wherein each control section has a most unfavorable control point provided with a liquid level instrument; the arterial drainage is provided with a plurality of water outlet pipes; all the switching wells are respectively communicated with the water outlet pipes in a way of one-to-one correspondence; each switching well is provided with a water inlet pipe and an overflow pipe, and is internally provided with a turbidity meter, a conductivity meter and an electric flashboard; each water inlet pipe is provided with a Doppler ultrasonic flow meter; the liquid level instruments, the turbidity meters, the conductivity meters, the electric flashboards and the Doppler ultrasonic flow meters are respectively connected with the controller. The system is simple in structure, convenient in implementation and low in engineering cost. According to the arterial drainage water quality regulation and control method, the system is utilized to calculate the flux of pollutant in the switching wells, and regulation and control are performed according to the principle that water in the switching wells with high flux of pollutant firstly enters the arterial drainage firstly and water in the switching wells with low flux of pollutant waits, so that the double-staggering peak adjustment of water quality and water quantity of the arterial drainage can be realized, and risk of waterlogging is reduced.

The invention discloses an operation panel control system of Doppler ultrasonic imaging equipment, comprising a control module, wherein the control module is used for detecting an input signal of an operation panel in a parallel way and sending a code corresponding to the input signal to an upper computer during the leisure of a transmission line. The operation panel control system of the Doppler ultrasonic imaging equipment detects input signals of various input devices of the operation panel of the Doppler ultrasonic imaging equipment in the parallel way, thereby reducing the response time and enhancing the operation and control sensitivity of the operation panel.

Provided is a doppler ultrasonic flowmeter. The doppler ultrasonic flowmeter has following beneficial effects: the doppler ultrasonic flowmeter is high in response speed of velocity fluctuation and not sensitive to factors such as pressure, viscosity, temperature, density and conductivity of fluid; and zero drift is avoided. The doppler ultrasonic flowmeter comprises an emission module, a reception and sampling module and a processing and control module. The key of the structure is characterized in that the emission module comprises a DDS circuit, a power amplification circuit and an ultrasonic transducer, all of which are sequentially connected; the reception and sampling module comprises a signal amplification circuit, a band pass filter connected with the amplification circuit, a frequency mixer connected with the low pass filter and a low pass filter connected with the frequency mixer; the power amplification circuit is connected with the frequency mixer; and the processing and control module is provided with a DSP core as a core and comprises an AVR in communication with the DSP core; and the outside of the AVR is further provided with a key module and a liquid crystal display module.

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.

The invention relates to a key control system of a Doppler ultrasonic diagnosis instrument. The key control system is connected with a color ultrasonograph host computer, and comprises a single-chip computer control module, a key module, a TGC (time grain compensation) module, a light-emitting diode (LED) display module and a sound generating module. The key control system has the characteristics that: an LED intelligent display chip is used for controlling the display of a backlight lamp, therefore the overall brightness adjustment of the backlight lamp can be realized and on / off of each LED can be controlled separately; single-chip computer control is adopted to achieve the synchronization technology of the state indication lamp in the key and the host computer state, and working mode and adjusting mode indication lamps are used to achieve better human-computer interaction; and by adopting PS / 2 interface to connect with a computer, the external connection of other keys are avoided in the setting process of basic input output system (BIOS), and the installation and maintenance become more convenient and rapider.