Abstract: An ultrasonic-wave transmitter/receiver is provided that can achieve a structure with stabilized underwater orientation and improved detection accuracy at a low cost. The ultrasonic-wave transmitter/receiver of the present invention includes an ultrasonic transducer for transmitting and receiving ultrasonic waves, a bell-shaped case that houses the ultrasonic transducer, and a cable for suspending the case. The ultrasonic transducer is cylindrical and positioned at the center of the bottom of the case. In the gap between the inner peripheral surface of the case and the outer peripheral surface of the ultrasonic transducer, a weight is positioned to surround the ultrasonic transducer, such that its center of gravity is aligned with the center of the case. The gap in the lower region within the case is filled with a filler A1, which also fixes the weight in place within the case.

Abstract: A flowmeter sensor can stably measure in a wide temperature range including one over 100° C. The flowmeter sensor includes an ultrasonic transducer, a pipe, and an acoustic prism. The acoustic prism has a bottom surface that is arranged in contact with the outer peripheral surface of the pipe and a front-side inclination surface that supports the ultrasonic transducer. The acoustic prism propagates ultrasonic waves from the ultrasonic transducer toward the fluid within the pipe. The pipe is made of a first heat-resistant resin having heat resistance in a temperature range of 90° C. to 200° C. and negative thermoacoustic characteristics in which the ultrasonic transmittance decreases as the temperature rises in such a temperature range. The acoustic prism is made of a second heat-resistant resin having heat resistance in the temperature range and positive thermoacoustic characteristics in which the ultrasonic transmittance increases as the temperature rises in such a temperature range.

Abstract: An ultrasonic-wave transmitter/receiver is provided that can achieve a structure with stabilized underwater orientation and improved detection accuracy at a low cost. The ultrasonic-wave transmitter/receiver of the present invention includes an ultrasonic transducer for transmitting and receiving ultrasonic waves, a bell-shaped case that houses the ultrasonic transducer, and a cable for suspending the case. The ultrasonic transducer is cylindrical and positioned at the center of the bottom of the case. In the gap between the inner peripheral surface of the case and the outer peripheral surface of the ultrasonic transducer, a weight is positioned to surround the ultrasonic transducer, such that its center of gravity is aligned with the center of the case. The gap in the lower region within the case is filled with a filler A1, which also fixes the weight in place within the case.

Abstract: The ultrasonic-wave irradiation unit provides excellent erosion resistance, ensuring a long service life, and achieves uniform oscillation displacement distribution, thereby minimizing uneven cleaning. The ultrasonic-wave irradiation unit comprises a diaphragm and a plurality of transducer units U1. Each transducer unit U1 includes a plurality of ultrasonic transducers, a resonator, and a connecting plate that transmits the oscillations of the ultrasonic transducers to the resonator. The connecting plate 61 has peaks and valleys along both side edges, forming alternating wide portions and narrow portions, with bolt insertion holes formed in the center of each wide portion. Adjacent connecting plates are arranged in a staggered manner in close proximity, such that the peaks of one plate fit into the valleys of the adjacent plate. The ultrasonic transducers and resonators are fastened and fixed to a plurality of bolts protruding through the bolt insertion holes of the connecting plate.

Abstract: The present invention provides an attachment for an ultrasonic-wave transmitter/receiver that can be used by changing directivity characteristics according to the situation, even if there is only one ultrasonic-wave transmitter/receiver. The attachment 60 to be attached to the ultrasonic-wave transmitter/receiver 10 comprises an acoustic lens 81, a holding member 61, and horizontal maintenance means 71. The acoustic lens 81 has a flat surface 82 and a convex surface 83 located on the opposite side. The holding member 61 holds the acoustic lens 81 with the flat surface 82 facing upward as well as detachably holds the ultrasonic transducer 10, so as to acoustically connect the acoustic radiation surface 10a to the flat surface 82. The horizontality-maintaining means 71 horizontally maintains the ultrasonic-wave transmitter/receive 10 and the acoustic lens 81.

Abstract: An ultrasonic transducer for a measuring instrument includes a housing container with a support plate and a piezoelectric element that is supported by the support plate and has a substantially circular shape. The piezoelectric element includes multiple substantially sector-shaped oscillation parts that are divided by multiple grooves that communicate with each other at the central part and extend radially. The piezoelectric element oscillates in the thickness direction A3 in the first frequency band and in the radial direction A4 in the second frequency band, which is lower than the first frequency band. The ultrasonic transducer is capable of expanding the frequency band suitable for transmitting and receiving ultrasound.

Abstract: An ultrasonic-wave irradiation unit capable of reducing erosion and cleaning unevenness on a diaphragm and improving the joining strength of an ultrasonic transducer to the diaphragm includes a diaphragm, an ultrasonic transducer, a front-side resonating member, and a rear-side resonating member. A stud bolt protrudes from the non-radiation surface of the diaphragm. The transducer front plate of the ultrasonic transducer is joined to the non-radiation surface. The front-side resonating member is joined to the non-radiation surface and the bolt is inserted therethrough. The rear-side resonating member is provided at the tip of the bolt to fasten and secure the front-side resonating member. End-positioned resonators, mid-positioned resonators, and the ultrasonic transducer are arranged in a column. The rear-side resonating member of the end-positioned resonator is formed from a metal material with higher bending rigidity than the front-side resonating member.

Abstract: The objective of this invention is to provide an ultrasonic-wave transmitter/receiver fish-finder that stabilizes its balanced state while in water to transmit ultrasonic waves vertically downward, thus improving detection accuracy. The ultrasonic-wave transmitter/receiver 10 includes an ultrasonic transducer 21 that transmits and receives ultrasonic waves; a hanging-bell shaped case 50 that houses the ultrasonic transducer 21; and a cable 40 that suspends the case 50. A weight 81 is arranged above the ultrasonic transducer 21 provided at the bottom 54 of the case 50. In addition, the filler A1 is filled into the case 50 such that a cavity A2 is secured in the upper region of the case 50.

Abstract: The object of this invention is to provide an ultrasonic transducer for a measuring device capable of widening a frequency band suitable for transmitting and receiving ultrasonic waves while reducing the manufacturing cost. The ultrasonic transducer for a measuring device includes a substantially disc-shaped base material that serves too as an acoustic-matching layer and substantially disc-shaped piezoelectric element that is joined to the base material. The piezoelectric element is formed with grooves extending in the planar direction so that they do not cross one another, and the plurality of strip-shaped vibration units are arranged through the grooves. The length of the vibration unit becomes shorter as the distance from the center of the piezoelectric element increases. Then, the piezoelectric element vibrates in the thickness direction in the first-frequency band and vibrates in the radial direction in the second-frequency band, which is lower than the first-frequency band.

Abstract: The flasher-type multi-frequency fish finder includes a wideband ultrasonic transducer, a display-rotating disk, a motor and a control device. The plurality of display LEDs are composed of the first, second and third display LEDs. The control device has a signal-separating and obtaining part and a light-emission signal-producing part. The signal-separating and obtaining part separates the reflected signal and obtains the first reflected signal corresponding to the high frequency, the second reflected signal corresponding to the medium frequency, and the third reflected signal corresponding to the low frequency. The light-emission signal-producing part generates first, second and third light-emission signals based on the first, second and third reflection signals, respectively. The first, second and third annular-display regions are concentrically set on the display surface.

Abstract: This invention provides a signal-processing method that makes it possible to acquire, relatively easily and surely, a highly reliable normalized impulse-response signal without relying on the signal-correction processing after normalization. The signal-processing method of this invention includes a low-frequency extraction step, a high-frequency extraction step and a synthesizing step. In the low-frequency extraction step, only the low-frequency component is extracted from the spectrum of the first normalized signal NS1 obtained by normalizing the target signal Stgt in the time domain. In the high-frequency extraction step, only the high-frequency component is extracted from the spectrum of the second normalized signal NS2 obtained by normalizing the target signal Stgt in the frequency domain using the reference signal Sref.

Abstract: A surface property measurement technology by which a surface property of a substance can be evaluated with high accuracy, is provided. A surface property measurement method includes radiating an ultrasonic wave to a measurement target and acquiring a reflected signal from the measurement target; calculating, by a measurement apparatus, a maximum value of a cross-correlation function between the reflected signal from the measurement target and a reference reflected signal from a reference substance acquired in advance; calculating a reflection component at an interface, by using the maximum value of the cross-correlation function; and outputting, as a measurement value, one of an acoustic impedance of the measurement target or an acoustic impedance of the reference substance, according to a result of comparing the reflection component with the reference reflected signal.

Abstract: An ultrasonic measurement method includes irradiating an object to be measured with an ultrasonic wave, acquiring a reflection wave from the object, calculating at a processor an acoustic impedance in a depth direction of the object from the reflection wave, and estimating and outputting a thickness of the object based upon an inflection point determined by second-order differentiation of the acoustic impedance.

Abstract: A fishfinder has: a transducer capable of transmitting an ultrasonic wave underwater and receiving a reflected wave of the ultrasonic wave; a display part that time-sequentially arranges a detection image based on a reception signal, caused by receiving the reflected wave with the transducer; a first depth calculation part that calculates a first depth as a depth of the bottom; a recognition part that performs recognition on an object as a fish school; a second depth calculation part that calculates a second depth as a depth of a position of the object; a distance calculation part that calculates a distance from the bottom to the position of the object; and a distance display part that displays the distance calculated with the distance calculation part, in correspondence with the position of the object in the detection image displayed on the display part, on the display part.

Abstract: An ultrasonic-image-construction apparatus can construct an ultrasonic-tomographic image of a thin, layer-structured target object to be measured relatively easily and highly accurately in a manner in which such layered structure is easily understood. An ultrasonic transducer of an ultrasonic-image-constructing apparatus transmits ultrasonic waves to the target object. A reference substance makes contact with a base substrate, with such ultrasonic waves being incident on the target object via the base substrate, then receives an impulse response of an ultrasonic waveform. A computing means performs calculation to estimate acoustic-physical-property distribution in consideration of the multiple-reflections influence based on normalized-impulse information obtained from impulse-response information of such ultrasonic waveform incident on the reference substance and from impulse-response information of such ultrasonic waveform incident on the target object.

Abstract: A sound-pressure analyzer in a high-intensity acoustic field that can accurately presume the cavitation-threshold and cavitation-amount being generated comprises: a hydrophone for transferring a voltage-signal corresponding to said sound-pressure in said acoustic field; a frequency-analyzer; and an arithmetic device. The frequency-analyzer analyzes the frequency-component in such an acoustic field based on the voltage-signal being transferred from the hydrophone and then sorts such signal into a basic-frequency component, a harmonic component, a sub-harmonic component and a white-noise component.

Abstract: A flasher type fish finder has: a motor with a rotary shaft having play in an axial direction; a display rotating disk fixed to the rotary shaft; a first installation part; and a second installation part fixed to a member not influenced by the play. In the first installation part, a magnet or a ferromagnetic material is on the rotary shaft or the display rotating disk such that the center of gravity is at the rotary shaft center. In the second installation part, a magnet or a ferromagnetic material is provided occurring an attraction force or a repulsive force in the axial direction, for the magnet or the ferromagnetic material of the first installation part. The magnet is in at least one of the first installation part and the second installation part. The surfaces of a first magnetic pole and a second magnetic pole are orthogonal to the rotary shaft.

Abstract: A flasher type fish finder has: a motor with a rotary shaft having play in an axial direction; a display rotating disk fixed to the rotary shaft; a first installation part; and a second installation part fixed to a member not influenced by the play. In the first installation part, a magnet or a ferromagnetic material is on the rotary shaft or the display rotating disk such that the center of gravity is at the rotary shaft center. In the second installation part, a magnet or a ferromagnetic material is provided occurring an attraction force or a repulsive force in the axial direction, for the magnet or the ferromagnetic material of the first installation part. The magnet is in at least one of the first installation part and the second installation part. The surfaces of a first magnetic pole and a second magnetic pole are orthogonal to the rotary shaft.

Abstract: An electromechanical transformation device for an ultrasonic flow meter comprises an alkaline niobate piezoelectric ceramic composition and a rigid body adhered onto the major surface of the ceramic composition. The ceramic composition is made of crystal structures such as orthorhombic crystals formed at the side where the temperature is lower than the orthorhombic-to-tetragonal phase transition temperature, tetragonal crystals formed at the side where temperature is higher that the orthorhombic-to-tetragonal phase transition temperature as well as at the side where the temperature is lower than the tetragonal-to-cubic phase transition temperature, and the cubic crystals formed at the side where the temperature is higher than the tetragonal-to-cubic phase temperature. Young's modulus of the rigid is 60 GPa or more. The volume percent of the ceramic composition existing within a range where the distance from the adhesion point of the piezoelectric ceramic composition and the rigid body is 40% or more.