113 results about "Elastic wave propagation" patented technology

A piezoelectric thin film of the present invention includes an aluminum nitride thin film that contains scandium. A content ratio of scandium in the aluminum nitride thin film is 0.5 atom % to 50 atom % on the assumption that a total amount of the number of scandium atoms and the number of aluminum atoms is 100 atom %. According to this arrangement, the piezoelectric thin film of the present invention can improve a piezoelectric response while keeping characteristics of elastic wave propagation speed, Q value, and frequency-temperature coefficient that the aluminum nitride thin film has.

The invention relates to a method and a device for the ultrasonic and nondestructive detection of the elasticity of a viscoelastic medium, which belong to the technical field of nondestructive measurements. The method comprises the following steps of: using an ultrasonic probe to produce low-frequency vibration on a medium to be detected, emitting ultrasonic waves to the medium to be detected and acquiring an ultrasonic signal returned from the medium to be detected; selecting an ultrasonic signal range for calculating the elasticity of the medium to be detected; using the selected ultrasonic signal to calculate the transmission speed of an elastic wave produced by the low-frequency vibration in the medium and further calculating the medium elasticity according to the obtained transmission speed of the elastic wave. The device comprises an ultrasonic wave energy converter contact, a vibrator fixing the ultrasonic wave energy converter contact and a control device. In the method and device, motion compensation of the ultrasonic probe is not required, so that calculation time is shortened; meanwhile, position detection is carry out without a position sensor, so that the system complexity and cost are lowered.

A quadplexer includes a first filter and a second filter having a pass band frequency that is higher than a pass band frequency of the first filter. The first filter includes series resonators disposed on a first path and parallel resonators disposed on a path that connects the first path and a ground to each other. A direction that connects ends of a plurality of electrode fingers defining each resonator crosses an elastic wave propagation direction at a predetermined angle. The series resonator nearest to a common terminal does not include first electrode fingers, and the other series resonators include the first electrode fingers.

A vibratory sensor is fabricated as a three-dimensional batch-micromachined shell adapted to vibrate and support elastic wave propagation and wave precession in the shell or membrane and at least one driving electrode and preferably a plurality of driving electrodes directly or indirectly coupled to the shell to excite and sustain the elastic waves in the shell. The pattern of elastic waves is determined by the configuration of the driving electrode(s). At least one sensing electrode and preferably a plurality of sensing electrodes are provided to detect the precession of the elastic wave pattern in the shell. The rotation of the shell induces precession of the elastic wave pattern in the shell which is usable to measure the rotation angle or rate of the vibratory sensor.

The invention provides an apparatus and method for stimulating a borehole of a well. The invention provides an apparatus that generates low-frequency seismic type elastic waves that propagate to the geologic formation and in order to enhance the movement of fluids in the geologic formation toward a well. The apparatus may operate automatically driven by a power source that may be located on the ground surface. The regime of operation may be determined by user input. Operation of the apparatus may carried out while production of a natural resource is ongoing.

A vibratory sensor is fabricated as a three-dimensional batch-micromachined shell adapted to vibrate and support elastic wave propagation and wave precession in the shell or membrane and at least one driving electrode and preferably a plurality of driving electrodes directly or indirectly coupled to the shell to excite and sustain the elastic waves in the shell. The pattern of elastic waves is determined by the configuration of the driving electrode(s). At least one sensing electrode and preferably a plurality of sensing electrodes are provided to detect the precession of the elastic wave pattern in the shell. The rotation of the shell induces precession of the elastic wave pattern in the shell which is usable to measure the rotation angle or rate of the vibratory sensor.

A ladder filter device includes elastic wave resonators with IDT electrodes. An apodization angle θ in an IDT electrode of a series arm resonator in the ladder filter device falls within a range from about 2° to about 14° with respect to an elastic wave propagation direction. This arrangement provides a ladder filter device that has a smaller insertion loss in a low frequency side portion of a passing band.

An object of the present disclosure is to provide an elastic wave resonator having a high Q value, and producing little or no unwanted spurious signals. In order to achieve the object, an elastic wave resonator according to the present disclosure includes a piezoelectric substrate and an IDT electrode. The IDT electrode has an apodization-weighting portion in which a staggered section width decreases toward an end portion of the IDT electrode in an elastic wave propagation direction. The electrode finger pitch of the IDT electrode decreases toward an end portion of the IDT electrode in an end portion, in the elastic wave propagation direction, of a staggered region of the IDT electrode.