128 results about "Ultrasonic wave propagation" patented technology

To detect the positions of the respective mobiles correctly without being affected by the ultrasonic waves from other mobile(s) in a case where plural mobiles are used simultaneously.The mobile comprises a unit that transmits a trigger signal of requesting transmitting ultrasonic wave that is capable of identifying the mobile, a unit that receives a trigger signal of allowing transmitting ultrasonic wave from the receiver, and a unit that transmits an ultrasonic wave immediately upon receipt of the trigger signal of allowing transmitting ultrasonic wave. The receiver comprises a unit that receives a trigger signal of requesting transmitting ultrasonic wave from the mobile, a unit that transmits a trigger signal of allowing transmitting ultrasonic wave that can be identified at the mobile side, a control unit that controls a transmitting timing of the trigger signal of allowing transmitting ultrasonic wave, at least two ultrasonic wave receiving units provided at predetermined gaps, a unit that calculates an ultrasonic wave propagation time from the mobile based on a time of transmitting the trigger signal of allowing transmitting ultrasonic wave and an ultrasonic wave arrival time, and a position calculation unit that calculates a position of the mobile based on the ultrasonic wave propagation time calculated.

In an ultrasonic washer for washing by splaying washing toward an object to be washed or a portion to be washed from a front end of a nozzle, a part of an ultrasonic wave propagation member connected to an ultrasonic transducer is protruded into a cavity of the nozzle into which the washing is filled in order to propagate ultrasonic vibration generated by the ultrasonic transducer to the washing efficiently. Furthermore, the ultrasonic wave propagation member is formed so that a cross-sectional area becomes gradually smaller as approaching to the front end thereof, so that the ultrasonic vibration is converged to the end face of the ultrasonic wave propagation member. Still furthermore, a length of the ultrasonic transducer and the ultrasonic wave propagation member is made to be integral multiplication of a half-wavelength of ultrasonic standing wave oscillation, and the end face of the ultrasonic wave propagation member from which the ultrasonic wave is emitted to the washing is disposed at a position of antinode of the ultrasonic standing wave oscillation where the amplitude becomes the largest.

In an ultrasonic washer for washing by splaying washing toward an object to be washed or a portion to be washed from a front end of a nozzle, a part of an ultrasonic wave propagation member connected to an ultrasonic transducer is protruded into a cavity of the nozzle into which the washing is filled in order to propagate ultrasonic vibration generated by the ultrasonic transducer to the washing efficiently. Furthermore, the ultrasonic wave propagation member is formed so that a cross-sectional area becomes gradually smaller as approaching to the front end thereof, so that the ultrasonic vibration is converged to the end face of the ultrasonic wave propagation member. Still furthermore, a length of the ultrasonic transducer and the ultrasonic wave propagation member is made to be integral multiplication of a half-wavelength of ultrasonic standing wave oscillation, and the end face of the ultrasonic wave propagation member from which the ultrasonic wave is emitted to the washing is disposed at a position of antinode of the ultrasonic standing wave oscillation where the amplitude becomes the largest.

The invention discloses a laser ultrasonic thickness measuring method and a laser ultrasonic thickness measuring device capable of being used for field detection. The laser ultrasonic thickness measuring method is characterized in that a laser beam is sent out by a laser to excite an ultrasonic wave on the surface in a specific position of a measured object; meanwhile, an excited wave signal and an echo wave signal produced on the surface in the position are received by an air coupling sensor on the same side of the measured object as the laser; and the propagation distance of the ultrasonic wave is calculated according to the time difference between the excited wave signal and the echo wave signal, and a longitudinal wave propagation velocity of the measured object, so that thickness measurement of the specific position is realized. The device mainly comprises the laser, a main supporting seat, the air coupling sensor, a supporting rod, a centering device, a signal processing system and a display system. The device has a simple and light structure, and can meet the requirements of field detection; and through the adoption of the non-contact type detection method, the thicknesses of high temperature and high-corrosive measured objects can be measured.

The invention discloses a universal liquid concentration supersonic-detection method and a universal liquid concentration supersonic-detection device. The universal liquid concentration supersonic-detection method is characterized in that because of different supersonic velocities of supersonic wave in different mediums, according to known sonic path distances, sonic travel time in the detected liquid is measured; and the measured value is corrected by real-time temperature values so that percentage contents of different solutes in different solvents are obtained. Through sampling of supersonic wave propagation velocities in different solvents and solutes at different temperatures, sampling results are obtained, and through the sampling results, a corresponding relationship formula of the supersonic velocities of supersonic wave in the solutions, and the temperatures and the concentrations is worked out so that liquid concentration measurement universality is realized. Through measurement of supersonic velocities in air and in purified water under laboratory conditions, the method and the device realize correction of system hardware errors and sonic path distance errors and improve a measurement precision.

The invention relates to a method and special device for measuring effective propagation length of ultrasonic wave in metal melt, and the method uses probe ultrasonic transceiver, indirectly guides ultrasonic wave through guide rod into metal melt, measures attenuation values of ultrasonic wave at different propagation lengths, adopts MATLAB software to make data fitting and calculates the effective propagation length of ultrasonic wave in metal melt. And the method can measure attenuation of ultrasonic wave in low temperature, medium temperature, high temperature and corrosive melt melts, and has low cost and high probe service life. And the device has a main character of comprising ultrasonic wave propagation length regulating system and temperature collecting system.

An ultrasonic flow rate measuring device which measures a flow rate of a medium flowing in the tube body, when one of a plurality of the ultrasonic transmitting-receiving means transmit an ultrasonic wave as a transmitting means, by making another one of a plurality of the ultrasonic transmitting-receiving means receive the ultrasonic wave as a receiving means, and when the other ultrasonic transmitting-receiving means transmit the ultrasonic wave as the transmitting means, by making the one ultrasonic transmitting-receiving means receive the ultrasonic wave as the receiving means, wherein an ultrasonic wave propagation control means which controls a propagation of the ultrasonic wave is equipped between the ultrasonic transmitting-receiving means as the transmitting means and the receiving means. Further, the ultrasonic flow rate measuring device is easily mounted to a tube body.

A test method and a measuring device for acoustic delay of a gas ultrasonic flowmeter relate to the technology for detecting ultrasonic wave propagation time of ultrasonic flowmeters, in particular to the technology for measuring time errors of electronic circuit signal propagation delay time, transducer signal delay time, signal sampling point delay time and signal cable delay time, and are suitable for sound velocity detection of various diameters of ultrasonic flowmeters. The test method for the acoustic delay is a measuring method for contrasting and proving acoustic delay data of a detected meter through a detected high-accuracy standard gas sound velocity measuring device, a computer and upper computer software according to standard sound velocity of a place where the detected gas ultrasonic flowmeter is located.

A time difference type supersonic wave flow measuring method and device belongs to a flow measuring method and device; speed distribution of real fluid is related to flow states, speed distribution on a circular pipe cross section in laminar flow is a rotation parabolic type, and speed distribution on a circular pipe cross section in turbulent flow is a boss type; supersonic wave carries fluid flow speed information when propagating in a flowing fluid, so the fluid flow speed can be detected according to received supersonic wave, and is converted into flow; a time difference type supersonic wave flow meter can calculate the flow through measuring the time difference of the supersonic wave beam in a forward flow and counter current propagation process; if the flow speed of the supersonic wave in a propagation path is assumed to be uniform, large measuring errors can be caused, and the time difference type supersonic wave flow measuring method can obtain the flow with more accuracy; the advantages are that the time difference type supersonic wave flow measuring method is reliable in theory, simple in device, reliable in method, convenient to implement, high in measuring precision, can improve the measuring result by 5-33%, and is suitable for all supersonic wave flow meters measuring flow according to propagation time difference.

An inkjet recording apparatus includes: an ink holding chamber having a through hole to jet ink, and holding the ink; and a head unit jetting the ink held in the ink holding chamber from the through hole. The head unit includes an ultrasonic wave generation member, an ultrasonic wave focusing member focusing the ultrasonic waves generated at the ultrasonic wave generation member in a vicinity of the through hole, an ultrasonic wave propagation portion propagateting the ultrasonic waves leaving the ultrasonic wave focusing member, and a container portion containing the ultrasonic wave generation member, the ultrasonic wave focusing member, and the ultrasonic wave propagation portion.

An ultrasonic flow rate measurement device includes a measurement channel, through which a fluid to be measured flows; and a sensor fixing casing having openings formed in the measurement channel and sensor fixing cavities communicating with the openings. Moreover, the ultrasonic flow rate measurement device includes a pair of ultrasonic sensors contained in the sensor fixing cavities, for measuring the flow rate of the fluid to be measured; and a flow rate measuring unit for detecting the flow rate based on an ultrasonic wave propagation time between the pair of ultrasonic sensors. Furthermore, the ultrasonic flow rate measurement device includes a suppressing member formed at each of the openings, for suppressing the fluid to be measured from intruding into each of the sensor fixing cavities, wherein the suppressing member is molded integrally with the sensor fixing casing.

The invention relates to a method for improving measurement accuracy of a gas ultrasonic flowmeter. The method includes the steps that pipeline diameter, coordinates of a fair current emitting point A, an initial emitting angle, coordinates of a counter current emitting point B, an initial emitting angle, the iteration time step and the maximum iteration step number are given; an iteration end boundary is determined; based on the geometrical acoustics theory, computer programming is used for conducting ray tracking on fair current and counter current conditions to obtain coordinates of all tracking points on fair current and counter current rays; actual ultrasonic wave propagation path lengths (namely actual acoustic paths) are calculated, and the included angles (namely actual ) between tangential directions of all the tracking points and the flowing direction are calculated; a time-difference method gas ultrasonic flowmeter calculating and modifying formula is used for obtaining a flow value. Flow measurement can be more accurate.

The present invention relates to a Method of measuring the viscoelastic properties of biological tissues employing an ultrasonic transducer equipped with elements converting the ultrasonic waves reflected by these biological tissues into electrical signals, different elements being grouped to form sub-apertures such that the acquisition of electrical signals from the elements of the same sub-aperture is carried out simultaneously, each of these sub-apertures being intercepted by an ultrasonic wave propagation axis at an acoustic center (Ca).In conformance with the invention, such a method is characterized in that one and the same element belongs to at least two different sub-apertures and in that an acoustic center is surrounded by at least three other unaligned acoustic centers.

The invention relates to a method and a device for carrying out charging and discharging upon storage batteries by using ultrasonic waves. With the method and device, ultrasonic waves with certain intensity are generated by using an ultrasonic generator; a prepared storage battery is placed in an ultrasonic wave transmission path; with high-frequency vibration and radiation pressure of the ultrasonic waves, effective stirring is formed in the electrolyte in the storage battery; and with the stirring of the electrolyte, reaction molecule movements therein are driven, such that storage battery oxidation-reduction reaction is promoted. With the method and the device provided by the invention, storage battery oxidation-reduction reaction intensity can be substantially improved, a complete reaction status can be reached more rapidly, and oxidation-reduction reactions at different positions on the surface of the solid substrate of the storage battery are more consistent. The device has the advantages of simple structure and low cost. Core elements comprise only an ultrasonic resonator element and a corresponding resonant circuit. The operation is simple, and automaton can easily be realized. The method and the device can be applied for storage batteries with water-based electrolyte systems, such as lead-acid batteries.

The coordinate input pen according to the present invention is a coordinate input pen for specifying a current position of the coordinate input pen by emitting an ultrasonic wave, including: an ultrasonic wave oscillating section for oscillating the ultrasonic wave for specifying coordinates of the current position; an ultrasonic wave emitting outlet for emitting, to an outside, the ultrasonic wave oscillated by the ultrasonic wave oscillating section; and an ultrasonic wave propagation route which has a fixed length and extends from the ultrasonic wave oscillating section to the ultrasonic wave emitting outlet and is used to propagate the ultrasonic wave to the ultrasonic wave emitting outlet. As a result, it is possible to maintain the output level of the ultrasonic wave oscillated by the ultrasonic wave oscillating section constant regardless of how large a stroke pressure applied on the coordinate input pen is.

The invention provides an ultrasonic wave residual stress test method and device, belonging to the welding residual stress nondestructive test field. The test method comprises: first, establishing the relation database between grain sizes and longitudinal wave signal attenuation degrees, critical refraction longitudinal wave propagation time in a zero stress sample, and sonoelastic coefficients, and the relation database between precipitation phasors and longitudinal wave signal attenuation degrees, critical refraction longitudinal wave propagation time in a zero stress sample, and sonoelastic coefficients; and in testing residual stress test, first determining the longitudinal wave signal attenuation degree of a test area, determining grain size and precipitation phasor calculating values according to the attenuation degree, further calculating the propagation time of the critical refraction longitudinal wave of the test area in a zero stress stretching sample and a sonoelastic coefficient, and finally obtaining corrected residual stress. The test method can correct errors of the sonoelastic coefficient and the ultrasonic wave propagation time in a zero stress sample caused by welding different area grain sizes and precipitation phasors, and substantially improve ultrasonic wave residual stress precision. The device can realize the method, and realize nondestructive correction of ultrasonic wave residual stress test results.

The invention discloses a rock mass real-time wave velocity measurement and quality evaluation method and belongs to the technical field of rock mass engineering. The method is characterized in that abutton of an ultrasonic wave sending device is continuously pressed at different ultrasonic wave sending positions and at different time, and the speed of ultrasonic waves propagated to each sensor each time is continuously calculated, and inversion is performed according to parameter change values such as wave speed, attenuation coefficient, waveform, frequency, frequency spectrum, amplitude andthe like to obtain physical and mechanical indexes and microstructure characteristics of the rock-soil body, such as change conditions of pores and cracks, so as to analyze the stability condition ofa mine rock body. The device is advantaged in that the device is combined with a micro-seismic system, testing can be completed only by arranging an ultrasonic sending system, operation is easy, theprice is low, and practicability is high; the ultrasonic testing technology has strong advantages in the field of rock-soil testing, ultrasonic waves have geometrical acoustics and physical acousticsat the same time, directivity of the sound waves is good, and energy is high; flexibility is high, and the test time, the test frequency, the test depth and the test position can be manually controlled.

The invention discloses a sound ray tracing method of a fiber reinforced plastic composite material laminated plate, and belongs to the technical field of composite material ultrasonic inspection. The method comprises the following steps: taking a single ply as a unit to partition a computational domain, and utilizing an elastic stiffness matrix and the rotation transformation of the elastic stiffness matrix to quantitatively descript the elastic characteristic space distribution of FRP (Fiber Reinforced Plastic) composite materials; combining with a Christoffel equation to solve to independently obtain the function relational expressions, which are about a propagation direction angle, of quasi-longitudinal wave group speed values corresponding to different fiber orientation lays; and carrying out computational domain meshing, utilizing a Dijkstra shortest path search algorithm to search nodes through which ultrasonic wave passes when the ultrasonic wave is transmitted to a target point from a source point, and calculating corresponding sonic time. The method can realize the quick and accurate calculation of an ultrasonic wave propagation path and sonic time in the FRP composite material which has a multilayer structure, elastic anisotropy and different fiber laying sequences, and support is provided for researching ultrasonic wave propagation behaviors, optimizing a detection parameter and improving ultrasonic imaging quality and accuracy.

An object detector capable of reliably detecting objects around a vehicle is mounted on a wall of a bumper of a vehicle. Thicknesses of the bumper and of a bottom surface portion of a housing are less than one-half the wavelength of ultrasonic waves generated by a piezoelectric vibrator. This suppresses the reflection of ultrasonic waves by the bumper and by the bottom surface portion of the housing, and enhances the ultrasonic wave propagation efficiency, making it possible to reliably detect objects positioned around the vehicle.

The invention relates to an ultrasonic wave sensor for a flowmeter. The ultrasonic wave sensor comprises a piezoelectric element consisting of a piezoelectric module and a virtual piezoelectric element module, a shell, a base, a sound emitting surface grounding electrode, a side face grounding electrode, a back grounding electrode, a driving electrode, a grounding electrode lead, a driving electrode lead, a grounding electrode terminal and a driving electrode terminal. A working principle is that ultrasonic wave sensors are arranged on the upstream and the downstream of a fluid passage with a specified sectional area respectively, one of the ultrasonic wave sensors on the upstream and the downstream emits ultrasonic waves, the other receives the ultrasonic waves, the two ultrasonic wave sensors alternately work, and the ultrasonic waves are overlapped with fluid velocity when the ultrasonic waves are transmitted forwards and backwards, so that time difference exits between the forward ultrasonic wave transmission time and the backward ultrasonic wave transmission time, and the fluid velocity can be calculated sequentially. Compared with the prior art, the ultrasonic wave sensor has the advantages that asymmetry of an ultrasonic wave receiving sensitivity characteristic is improved by adjusting the intensity distribution of the ultrasonic waves output by the piezoelectric element, a signal to noise ratio (S / N) of an ultrasonic flowmeter inspection signal can be improved and the flow measuring accuracy is improved.

The invention discloses a 3D gesture recognition controller and method based on ultrasonic locating. The controller comprises a signal acquisition circuit and a locating and recognition unit. The method includes the steps that a background signal is collected and filtered; an ultrasonic wave transmission signal is colleted, collected data are filtered, and data obtained after the background signal is filtered are subtracted from filtered data; a direct signal and a reflected signal are intercepted, and maximum likelihood estimation is carried out on time delay between the direct signal and the reflected signal; ultrasonic wave signal propagation time is obtained through perpendicular incidence time and the delay time, the propagation distance of ultrasonic waves transmitted by a transmitting probe, reflected through a hand and received by a receiving probe is obtained according to the ultrasonic wave signal propagation time so as to obtain the position coordinates of gestures accordingly, and position coordinate data of standard gestures are collected and stored; the distances between samples in a table and the coordinates of all the standard gestures are calculated; whether the minimum distance between the samples in the table and the coordinates of the standard gestures is smaller than a set value or not is analyzed, if yes, a corresponding labeled gesture is output, and otherwise judgment is not made.

The invention relates to an ultrasonic pipe wall thickness measuring device. The ultrasonic pipe wall thickness measuring device comprises an ultrasonic probe, a reflector, a fixed shaft, a stator, a rotor and a rotor outer shell. The fixed shaft is arranged in the center inside the rotor outer shell, the stator is connected to the fixed shaft in a concentric mode, the rotor is connected to the inner side wall of the rotor outer shell in a concentric mode, the ultrasonic probe is connected to the fixed shaft, the reflector is connected to the rotor outer shell, and an acute angle is formed between the direction of a reflector face and the direction of ultrasonic propagation. According to the ultrasonic pipe wall thickness measuring device, the stator is connected to the fixed shaft, the fixed shaft does not rotate, the rotor is arranged on the rotor outer shell and rotates around the fixed shaft, the rotor rotates evenly and stably after being powered on and drives the reflector to rotate, and ultrasonic waves generated by the probe are vertically reflected to the inner circumferential surface of a pipe wall through the reflector; when the ultrasonic pipe wall thickness measuring device is used underwater, water in the device is centrifugally thrown out through holes formed in the circumferential direction, impact of axial water flow on the reflector face is quickened, the reflector face can be cleaned automatically, therefore, the degree of finish of the reflector face is improved, the ultrasonic waves can not be scattered, and consequently, detection precision is improved.

The invention relates to a wind speed and wind direction measurement method. The method comprises the following steps of firstly, arranging two pairs of ultrasonic transducers which are vertical to each other, are located in a same plane and possess a transmit-receive function, and arranging one ultrasonic reflection plate above the two pairs of ultrasonic transducers; secondly, measuring and acquiring propagation time of an ultrasonic wave which is received by the two transducers in each transducer pair from opposite sides through the ultrasonic reflection plate; and then, according to the measured ultrasonic wave propagation time and a spacing of the two opposite transducers in the corresponding ultrasonic transducer pair, acquiring a corresponding ultrasonic wave propagation speed; and finally, according to the corresponding ultrasonic wave propagation speed, calculating a wind speed and a wind direction. By using the method of the invention, wind speed and wind direction measurement does not influenced by an environment; measurement precision is high and a system cost is low.

The invention relates to a reversing radar as well as a circuit and method for processing the ultrasonic echo signal of the reversing radar. The circuit comprises a voltage comparator, a timer module and a reference voltage generating module; the negative input end of the voltage comparator is connected with the echo signal input end; the timer module is used for recording the ultrasonic wave propagation time; and the reference voltage generating module is connected with the timer module and used for generating the corresponding reference voltage according to the ultrasonic wave propagation time and outputting the reference voltage to the positive input end of the voltage comparator. The traditional fixed ultrasonic echo comparison is improved and changed into the dynamic adjustable ultrasonic echo comparison comparison, thus when the distance of the obstacle distance is near, the amplitude of the echo signal is high, and the corresponding reference voltage is high, and the distance of the obstacle distance is far, the amplitude of the echo signal is low and the corresponding reference voltage is low. The circuit is simple and has low cost, high flexibility and more stable performance.