Abstract: According to one embodiment, an inspection device includes a transmitter configured to transmit a first ultrasonic wave, a receiver on which the first ultrasonic wave is incident, and a receiving-side waveguide located between the receiver and an inspection position. The receiver is configured to output a signal corresponding to the incident first ultrasonic wave. The inspection position is between the transmitter and the receiver. The first ultrasonic wave passes through the receiving-side waveguide. An inspection object passes through the inspection position along a second direction crossing a first direction. The first direction is from the transmitter toward the receiver. The receiving-side waveguide includes at least one of a first structure or a second structure. In the first structure, the receiving-side waveguide includes a tubular member and an inner member. The inner member is located inside the tubular member. In the second structure, the receiving-side waveguide includes a tubular member.

Abstract: According to one embodiment, an inspection device includes a transmitter, a receiver, and a supporter. The transmitter is configured to transmit a first ultrasonic wave including burst waves having a first period Tp. The receiver on which the first ultrasonic wave is incident is configured to output a signal corresponding to the incident first ultrasonic wave. The supporter is provided between the transmitter and the receiver. The supporter is configured to support an inspection object. The first period Tp (s), a distance Dx (m), and a velocity vx (m/s) satisfy 2Dx/((n+1)·vx)<Tp<2Dx/(n·vx). n is 1 or 2. The distance Dx is a shorter distance of first and second distances. The first distance is a distance along a first direction between the transmitter and the supporter. The second distance is a distance along the first direction between the supporter and the receiver.

Abstract: A sensor includes a first element part having a first member and a first element. The first member is a acoustic tubular waveguide and extends along a first direction. The acoustic tubular waveguide includes a first opening and a second opening. A direction from the second opening toward the first opening is along the first direction. The first element includes a vibratile first membrane, and a first supporter supporting the first membrane. The second opening is between the first opening and the first membrane in the first direction. The sensor may be a Piezoelectric Micro electro mechanical systems Ultrasonic Transducer and may be used for inspecting paper and/or resin including detecting thickness of a fed through banknote and/or the presence of foreign matter thereon such as tape. An optical element may alternatively measure the vibration of a membrane from acoustic through transmission instead of an acoustic receiver.

Abstract: According to one embodiment, an ultrasonic device includes an ultrasonic transmitter. The ultrasonic transmitter includes a first element, a second element, and a driver. The first element is flexing-vibratable at a first resonant frequency. The second element is flexing-vibratable at a second resonant frequency different from the first resonant frequency. The driver is configured to supply a first electrical signal to the first element and to supply a second electrical signal to the second element. The first electrical signal includes a first signal having the first resonant frequency. The second electrical signal includes a second signal having the second resonant frequency.

Abstract: According to one embodiment, an inspection device includes a transmitter configured to transmit a first ultrasonic wave, a receiver on which the first ultrasonic wave is incident, and a receiving-side waveguide located between the receiver and an inspection position. The receiver is configured to output a signal corresponding to the incident first ultrasonic wave. The inspection position is between the transmitter and the receiver. The first ultrasonic wave passes through the receiving-side waveguide. An inspection object passes through the inspection position along a second direction crossing a first direction. The first direction is from the transmitter toward the receiver. The receiving-side waveguide includes at least one of a first structure or a second structure. In the first structure, the receiving-side waveguide includes a tubular member and an inner member. The inner member is located inside the tubular member. In the second structure, the receiving-side waveguide includes a tubular member.

Abstract: A multilayer ultrasonic transducer of an embodiment includes: a plurality of stacked oscillators; external electrodes disposed on outer exposed surfaces of two oscillators disposed in the outermost layers out of the plurality of oscillators; and a plurality of internal electrodes each disposed between two of the plurality of oscillators. There are provided electrode regions in which the plurality of internal electrodes are arranged such that the number of layers of the internal electrodes in a direction in which the oscillators are stacked gradiently increases from an inner region toward an outer peripheral region of the plurality of oscillators, and ultrasonic waves emitted from the plurality of oscillators are focused toward at least the inner region.

Abstract: According to one embodiment, an inspection device includes a transmitter, a receiver, and a supporter. The transmitter is configured to transmit a first ultrasonic wave including burst waves having a first period Tp. The receiver on which the first ultrasonic wave is incident is configured to output a signal corresponding to the incident first ultrasonic wave. The supporter is provided between the transmitter and the receiver. The supporter is configured to support an inspection object. The first period Tp (s), a distance Dx (m), and a velocity vx (m/s) satisfy 2Dx/((n+1)·vx)<Tp<2Dx/(n·vx). n is 1 or 2. The distance Dx is a shorter distance of first and second distances. The first distance is a distance along a first direction between the transmitter and the supporter. The second distance is a distance along the first direction between the supporter and the receiver.

Abstract: According to one embodiment, a transducer includes a first electrode, a second electrode, a third electrode, a first piezoelectric portion, and a second piezoelectric portion. A resistor and an inductor are connected to the second electrode. The first piezoelectric portion is provided between the first electrode and the third electrode. The second piezoelectric portion is provided between the second electrode and the third electrode. A ratio of the absolute value of a difference between a first resonant frequency and a second resonant frequency to the first resonant frequency is 0.29 or less. The first resonant frequency is mechanical. The first resonant frequency is of the first piezoelectric portion and the second piezoelectric portion. The second resonant frequency is of a parallel resonant circuit. The parallel resonant circuit includes an electrostatic capacitance, the inductor, and the resistor. The electrostatic capacitance is between the second electrode and the third electrode.

Abstract: According to an embodiment of the invention, a sensor includes a first element part. The first element part includes a first member and a first element. The first member is tubular and extends along a first direction. The first member includes a first opening and a second opening. A direction from the second opening toward the first opening is along the first direction. The first element includes a vibratile first membrane, and a first supporter supporting the first membrane. The second opening is between the first opening and the first membrane in the first direction.

Abstract: According to one embodiment, a transducer includes first structure sections and second structure sections. The first structure sections are spaced from each other in a first direction. Part of each of the first structure sections is fixed. The each of the first structure sections includes a first membrane part, a first piezoelectric part, a first conductive part, and a first electrode. The second structure sections are spaced from each other in the first direction. Part of each of the second structure sections is fixed. The each of the second structure sections includes a second membrane part, a second piezoelectric part, a second conductive part, and a second electrode. The second structure sections are spaced from the first structure sections in the first direction. Pitch along the first direction of the second structure sections is shorter than pitch along the first direction of the first structure sections.

Abstract: A parameter estimation method, comprises: acquiring appearance information including a shape information and a position information of at least one package; vibrating the at least one package at least at one position selected in accordance with the appearance information, and acquiring at least one data showing a vibration of the at least one package, and estimating a value of at least one parameter of the at least one package in accordance with a relation between the at least one data and the at least one parameter.

Abstract: According to one embodiment, an inspection device includes a transmitter, a receiver, a feeder, and a processor. The transmitter emits an ultrasonic wave. The feeder causes an inspection object to move relative to the transmitter and the receiver in a space between the transmitter and the receiver. The processor processes a received signal corresponding to the ultrasonic wave obtained by the receiver. In a first state in which the inspection object includes a first region and a second region, the first region includes a foreign object, and the second region does not include the foreign object. The received signal includes a first signal level in a first interval, a second signal level in a second interval, and a third signal level in a third interval. The processor detects the foreign object by detecting at least one extreme value occurring in the received signal in a fourth interval.

Abstract: According to one embodiment, an ultrasonic device includes an ultrasonic transmitter. The ultrasonic transmitter includes a first element, a second element, and a driver. The first element is flexing-vibratable at a first resonant frequency. The second element is flexing-vibratable at a second resonant frequency different from the first resonant frequency. The driver is configured to supply a first electrical signal to the first element and to supply a second electrical signal to the second element. The first electrical signal includes a first signal having the first resonant frequency. The second electrical signal includes a second signal having the second resonant frequency.

Abstract: A multilayer ultrasonic transducer of an embodiment includes: a plurality of stacked oscillators; external electrodes disposed on outer exposed surfaces of two oscillators disposed in the outermost layers out of the plurality of oscillators; and a plurality of internal electrodes each disposed between two of the plurality of oscillators. There are provided electrode regions in which the plurality of internal electrodes are arranged such that the number of layers of the internal electrodes in a direction in which the oscillators are stacked gradiently increases from an inner region toward an outer peripheral region of the plurality of oscillators, and ultrasonic waves emitted from the plurality of oscillators are focused toward at least the inner region.

Abstract: According to one embodiment, an inspection device includes a transmitter, a receiver, a feeder, and a processor. The transmitter emits an ultrasonic wave. The feeder causes an inspection object to move relative to the transmitter and the receiver in a space between the transmitter and the receiver. The processor processes a received signal corresponding to the ultrasonic wave obtained by the receiver. In a first state in which the inspection object includes a first region and a second region, the first region includes a foreign object, and the second region does not include the foreign object. The received signal includes a first signal level in a first interval, a second signal level in a second interval, and a third signal level in a third interval. The processor detects the foreign object by detecting at least one extreme value occurring in the received signal in a fourth interval.

Abstract: A parameter estimation method, comprises: acquiring appearance information including a shape information and a position information of at least one package; vibrating the at least one package at least at one position selected in accordance with the appearance information, and acquiring at least one data showing a vibration of the at least one package, and estimating a value of at least one parameter of the at least one package in accordance with a relation between the at least one data and the at least one parameter.

Abstract: According to one embodiment, a transducer includes first structure sections and second structure sections. The first structure sections are spaced from each other in a first direction. Part of each of the first structure sections is fixed. The each of the first structure sections includes a first membrane part, a first piezoelectric part, a first conductive part, and a first electrode. The second structure sections are spaced from each other in the first direction. Part of each of the second structure sections is fixed. The each of the second structure sections includes a second membrane part, a second piezoelectric part, a second conductive part, and a second electrode. The second structure sections are spaced from the first structure sections in the first direction. Pitch along the first direction of the second structure sections is shorter than pitch along the first direction of the first structure sections.

Abstract: According to one embodiment, a sensor includes a transmission/reception device and a processing device. The transmission/reception device is configured to emit a pulse wave having a first frequency toward liquid in a container, to receive a reflection wave of the pulse wave, and to output a first signal. The container includes a part in contact with the liquid. The processing device is capable of outputting strength of a first frequency reflection wave of a first frequency band contained in a second signal and strength of a second frequency reflection wave of a second frequency band contained in a third signal. The third signal is obtained by squaring the second signal. The second signal is obtained by subtracting a fourth signal from the first signal. The fourth signal is obtained by integrating the first signal. The first frequency band includes the first frequency.

Abstract: According to one embodiment, a transducer includes a first electrode, a second electrode, a third electrode, a first piezoelectric portion, and a second piezoelectric portion. A resistor and an inductor are connected to the second electrode. The first piezoelectric portion is provided between the first electrode and the third electrode. The second piezoelectric portion is provided between the second electrode and the third electrode. A ratio of the absolute value of a difference between a first resonant frequency and a second resonant frequency to the first resonant frequency is 0.29 or less. The first resonant frequency is mechanical. The first resonant frequency is of the first piezoelectric portion and the second piezoelectric portion. The second resonant frequency is of a parallel resonant circuit. The parallel resonant circuit includes an electrostatic capacitance, the inductor, and the resistor. The electrostatic capacitance is between the second electrode and the third electrode.

Abstract: According to embodiment, a piezoelectric transducer includes a polarized single crystal piezoelectric body comprising a lead complex perovskite compound containing niobium oxide and at least one of magnesium oxide and indium oxide and including a first plane whose crystal orientation is [100] and a second plane which faces the first plane and whose crystal orientation is [100], and first electrode provided on the first plane side of the body and a second electrode provided on the second plane side of the body. A ratio of a second FWHM of diffracted X-rays at the Miller index (400) of the body to a first FWHM of diffracted X-rays at the miller index (400) of the body which is unpolarized or has undergone depolarization processing is not less than 0.22 and not more than 0.4.