18 results about "Acoustic wave" patented technology

A flow-through muffler includes a plurality of heat conducting walls, baffles, or partitions that together define a plurality of passages arranged to form acoustic waveguides, attenuators, and/or cancellation chambers, the walls, baffles, or partitions increasing a surface area exposed to the exhaust gases to facilitate extraction of heat while attenuating or canceling the resulting sound pressure waves. The muffler may have a cooling arrangement mounted thereon, and thermoelectric generator elements or other heat-powered device, such as a reformer, connected across the heat differential between the cooling arrangement and an exterior surface of the muffler housing that is in thermal contact with the heat conducting walls, bafflers, or partitions. In addition, the muffler may be made tuneable by providing a device for varying a length of one of the passages relative to another passage, and by including a sound cancellation chamber at an intersection of the passages. In addition, the internal surfaces of the muffler may be coated with a catalyst to provide a combination muffler and catalytic converter.

In one aspect of the invention, an acoustic device has a first coupled resonator filter (CRF) and a second CRF electrically coupled to one another in series. Each CRF has an input port, an output port, a bottom film bulk acoustic resonator (FBAR), an acoustic decoupler formed on the bottom FBAR, and a top FBAR formed on the acoustic decoupler. Each FBAR has a bottom electrode, a piezoelectric layer formed on the bottom electrode, and a top electrode formed on the piezoelectric layer. The decoupling layer capacitance arising between the two electrodes enclosing the acoustic decoupler in a CRF is configured to achieve targeted filter response. A compensating capacitance is introduced to improve the amplitude and phase imbalance performance of an unbalanced to balanced CRF by eliminating the existence of asymmetric port-to-ground or feedback capacitance at the balanced output port produced by the decoupling layer capacitance.

A towrope type ocean controllable source electromagnetism and earthquake data collection system is composed of electric field sensors (non-polarized electrodes) distributed in three or more towropes uniformly or not, three-component induction coil type or three-component fluxgate type magnetic field sensors and sonic sensors composed of hydrophones or accelerometers and is used for measuring ocean three-component magnetic-field components, electric field components EX distributed in the cable direction, electric field components EY distributed in the vertical cable direction and ocean earthquake data. The towrope type ocean controllable source electromagnetism and earthquake data collection system can collect ocean electromagnetism data and ocean earthquake data in the time domain and the frequency domain at the same time, increase the collection quantity of ocean geophysics data of advancing construction at a time in a multiplying mode, effectively improve the target detection precision and explore and evaluate ocean mineral products, oil and gas resources and methane hydrates through combination and comprehensive application of ocean controllable source time-frequency electromagnetism and the earthquake exploration technology.

Method for examining bone in vivo, comprises obtaining a laser beam; modulating the laser beam to insert therein photoacoustic frequencies including optical frequencies and acoustic frequencies, the acoustic frequencies being able to give rise to acoustic waves; directing the modulated beam at a bone to cause acoustic waves resulting from the beam to travel through the bone; analyzing received signals from the bone including signals resulting from the acoustic waves, to determine a mineral density and a bone quality for said bone, and thus obtain in-vivo data that can be of assistance to a doctor when diagnosing osteoporosis.

The invention discloses a method for determining reservoir water saturation, which comprises the following steps of: obtaining the porosity and permeability of a rock core, and establishing a porosity-permeability calculation model by combining acoustic logging data; Obtaining a saturation index n value, and establishing a reservoir resistivity calculation model when the water content is 100%; Respectively establishing a calculation model of irreducible water saturation and residual oil saturation; Determining the resistivity of the original formation water and the resistivity of the slurry filtrate of the oil reservoir by utilizing test analysis, and determining the resistivity of a pure oil layer by irreducible water saturation, residual oil saturation, resistivity of a flushing zone anda saturation index; And establishing a new reservoir water saturation calculation model, and calculating the reservoir water saturation through the reservoir measurement resistivity, the reservoir resistivity when the water content is 100%, the pure oil layer resistivity and the irreducible water saturation. According to the method, the water saturation of the reservoir stratum is solved point bypoint through logging data without depending on an alpha formula under the condition that formation water resistivity of different stratum sections of the stratum is unknown, and a new method is provided for accurately solving the water saturation of the reservoir stratum.

The invention discloses a well-ground seismic data joint acquisition system based on distributed optical fiber acoustic wave sensing and a well drive data processing method. In order to solve the problems of inconsistent energy, inconsistent frequency spectrum and incompletely consistent coupling between a seismic source and the ground caused by repeated excitation of each seismic source point when seismic data in a well and seismic data on the ground are respectively acquired in the prior art, the invention discloses an in-well-ground seismic data combined three-dimensional acquisition systemformed by a distributed optical fiber sound wave sensing seismic data acquisition unit and a ground seismic data acquisition unit. In-well-ground combined three-dimensional exploration is carried out, ground and in-well seismic data are synchronously collected, the high-density, high-benefit, high-resolution and low-cost well-ground combined three-dimensional seismic exploration technology is achieved, and oil and gas resource exploration and comprehensive evaluation are carried out.

The invention relates to the field of sound absorbing materials used for buildings, and particularly relates to sound absorbing mortar and a sound absorbing material. The sound absorbing mortar mainly comprises, by weight, 70-80 parts of sand grains, 6-12 parts of silicate and 12-20 parts of water. The sound absorbing material is prepared from the sound absorbing mortar, can achieve large-area seamless decoration and has a good environment protection property. Through a manufacturing process, the particle size and a shaping manner of the sand grains can be accurately controlled, thus determining the size and the arrangement manner of inner pores. Silica sand plasterer slurry having various flow resistance and sound absorbing characteristics can be produced, has good absorbing effects on low-frequency and high-frequency noises, and can greatly decrease sound wave reflection. In addition, the sound absorbing material is high in strength and flame-retardant.

The invention discloses a method and device for monitoring ash dirt on a convection heating surface of a boiler. The device comprises a sound wave guide tube, a sound wave receiver, a sound wave generator, a signal conditioner, a junction box, an input and output device, a power amplifier and an industrial personal computer. The method comprises the steps of: firstly, sending a sound wave signal by the industrial personal computer, amplifying with the power amplifier and then sending to the sound generator; secondly emitting sound wave by the wave generator, spreading the sound wave to a hearth of the boiler through the sound wave guide tube, receiving a sound wave return signal of the hearth of the boiler by the sound wave receiver, transmitting the sound wave return signal to the industrial personal computer; thirdly, measuring sound wave crossing time by the industrial personal computer, and solving the smoke side temperature of the boiler; and finally, solving an actual heat exchange coefficient and obtaining an ash dirt coefficient. The invention adopts a non-contact measurement manner, and can be applied to environments with high temperature and much dirt and pollution; and the device is simple in operation, and provides a clear and simple visualization interface.

The invention provides a real-time interval transit time extraction method based on particle swarm optimization, mainly to solve the problems of large amount of operation and low precision in the caseof interval transit time calculation by the traditional STC algorithm. The realization process comprises steps: (1) ranges of first wave arrival time and interval transit time of a certain mode waveare given; (2) a population is initialized; (3) the fitness value of a particle is calculated; (4) the historical highest fitness value of the particle and the global historical highest fitness valueof the population are updated; (5) the position of the particle is updated; and (6) whether the algorithm meets an end condition is judged, and if yes, iteration is stopped, or otherwise, the step (3)is carried out. The particle swarm optimization algorithm based on population random search is adopted for interval transit time extraction, traversal search of time and slowness is not needed, the algorithm is the global optimization method, the amount of operation of a program is greatly reduced, and the formation interval transit time can be quickly and accurately extracted.

The invention discloses a microwave sensor. The microwave sensor is characterized by comprising a power supply circuit, an oscillating circuit, an amplifying circuit, an output circuit and an indicating circuit, wherein the power supply circuit is used for supplying power for the oscillating circuit and the amplifying circuit; the oscillating circuit is connected with the power supply circuit; the amplifying circuit is connected with the oscillating circuit and the output circuit; the output circuit is connected with the amplifying circuit; and the indicating circuit is connected with the output circuit and comprises a light-emitting diode (LED) lamp. When the sensor is touched, the LED lamp is lighted. The oscillating circuit of the microwave sensor is adopted to generate microwaves and receive reflection waves without additionally arranging a microwave emission probe and a microwave receiving probe, so compared with other microwave sensors, the microwave sensor provided by the invention saves cost and eliminates the trouble of installing the microwave probes. The microwaves serve as detection means, so the microwave sensor is high in sensitivity and is not affected by the interference of sound waves; and the microwaves have strong penetrability, so the microwave sensor is easy to mount reconditely, is not easy to damage and is safer in use.

The invention provides a high-sensitivity metal baseband armored vibration sensing optical cable. The vibration sensing optical cable comprises optical cables, metal basebands, metal through holes, and adhesive. The optical fibers are placed in the metal basebands with semi-elliptic slots, and the two metal basebands and the optical fibers are solidified into a whole armored optical cable through opposite adhesion. By designing the metal baseband armored vibration sensing optical cable, a simple-to-process and low-cost way of armored enhanced protection is provided for optical fibers. The service life of the vibration sensing optical cable is prolonged greatly. The sensing optical cable can be welded onto an area to be monitored, and can be kept in a high-sensitivity vibration to-be-received state for a long time. By designing the metal baseband armored vibration sensing optical cable, more vibration disturbance can be converted into deformation of the optical fibers, the vibration sensing sensitivity is improved greatly, and long-distance distributed optical fiber real-time monitoring of ultra-weak vibration signals such as sound wave is realized. The high-sensitivity metal baseband armored vibration sensing optical cable can be applied to the field of distributed optical fiber vibration sensing applications.

The invention provides a communication method and system based on a sound wave transmitting and receiving terminal. The method comprises the steps that a first terminal enables the first frequency information of a receivable sound wave to be modulated and added to a first group of sound waves with at least two frequencies and then to be transmitted; a second terminal carries out the demodulation of the first group of sound waves through employing a preset specific second frequency; The first terminal enables the first frequency information to be modulated and added to a second group of sound weaves for transmission if the information of a first type and the first frequency information are not obtained through demodulation, wherein the second group of sound waves have at least two frequencies different from the frequencies of the first group of sound waves; and the first and second terminals carries out communication with each other through the first and second frequencies if the information of the first type and the first frequency information are obtained through demodulation. Through the above mode, the method and system enable the communication terminals based on the sound waves to achieve automatic matching of sound wave frequencies, improve the compatibility of data transmission between communication terminals, and improve the success rate of communication data transmission.

The invention discloses a compressor. The compressor comprises a shell, a motor and at least one muffler, wherein the motor is arranged in the shell, each muffler is connected to the inner wall of the shell, a muffling chamber is defined between each muffler and the shell, and a plurality of through holes are formed in each muffler. According to the compressor disclosed by the invention, the muffling chamber is defined by each muffler and the shell, so that sound waves can enter each muffling chamber for resonance muffling, and the noise problem of the compressor is obviously solved.

The invention provides a rainwater flow guiding pipe with silencing pipe walls and gradually-changed staggered layers on the inner wall. The portion between the two layers of pipe walls is divided into a plurality of closed small spaces which can primarily obstruct noise generated when the pipe walls are washed by rainwater. Beside, the small spaces are filled with energy absorbing balls. When sound is transmitted into the small spaces, sound wave vibration energy is absorbed, and noise is further eliminated. Canine-tooth-type staggered protrusions are arranged on the inner side of the inner pipe wall in the radial direction. After rainwater is washed down, the rainwater flows along a circumflex-shaped path formed by the staggered protrusions, rainwater washing speed is decreased, sound generated when the rainwater impacts the pipe walls is reduced, and the effect of eliminating noise is achieved. The height of the protrusions becomes smaller while the rainwater flow speed is decreased, and the situation that the rainwater overflows from the upper end of the flow guiding pipe when the water flow is too large is also prevented at the same time on the premise that it is guaranteed that noise is lowered. The outer surfaces of the protrusions are wrapped in PVC membranes, during rainwater washing, water flow can be buffered, and the effect of eliminating noise is further achieved.