An elastic matrix determination method and a vibration analysis method for a laminated iron core, with which it is possible to optimally determine an elastic modulus of a laminated iron core. When a vibration analysis of a laminated iron core obtained by laminating steel sheets is performed by using a configuration expression indicating a relationship between stress and strain in a matrix display by using an elastic matrix, a shear modulus in two surfaces including a laminating direction of the laminated iron core included in the elastic matrix in the configuration expression is determined in consideration of slip between laminated steel sheets.

An ultrasonic inspection apparatus includes: an acquisition unit acquiring a signal indicating a fundamental wave and a second harmonic of an ultrasonic wave, which are obtained by the ultrasonic wave being scanned over an inspection object through a medium, at each scanning position; a calculation unit calculating a value obtained by dividing a second harmonic amplitude by a square of a fundamental wave amplitude, at each scanning position; and an output unit outputting information on a defect of the inspection object, based on the value obtained by dividing the second harmonic amplitude by the square of the fundamental wave amplitude.

A photoacoustic microscope includes: a light source which generates pulse light; a focusing optical system which focuses the pulse light emitted from the light source and irradiate a sample with the focused pulse light; a photoacoustic signal detection unit which detects an acoustic signal generated from the sample through irradiation of the pulse light; an image signal formation unit which forms an image signal of the sample based on the acoustic signal; an information unit having information representing a relation between intensity of the pulse light entering the sample and intensity of the acoustic signal generated from the sample; and a pulse light intensity changing unit which changes intensity of the pulse light from the light source based on the information.

Aspects of the technology described herein relate to a capacitive micromachined ultrasonic transducer (CMUT) and a heater disposed in the CMUT, and forming a capacitive micromachined ultrasonic transducer (CMUT) and a heater disposed in the CMUT. A voltage may be applied to a heater disposed in a CMUT in an ultrasound imaging device in order to cause the heater to generate heat. Based on determining that the collapse voltage of the CMUT has increased by at least a threshold voltage between two times, a voltage may be automatically applied to a heater in the CMUT such that the heater generates heat.

A method for testing a component non-destructively, particularly for internal defects, includes the following steps: a) providing a rotationally symmetrical component having a plurality of preferably cylindrical recesses, which are arranged at one or more hole circles, b) arranging a transmitter probe serving as an ultrasound transmitter and a receiver probe serving as an ultrasound receiver spaced apart from each other outside the component such that ultrasound waves can be irradiated into a shaded area located behind one of the recesses in the component by the transmitter probe and ultrasound waves which are diffracted at least at one defect present in the shaded area can be received by the receiver probe, and c) using time of flight to determine whether one or more faults are present in the shaded area. An apparatus carries out such a method.

An ultrasonic in-situ automatic detection system for creep cracks on an inner wall of a hydrogen production furnace tube. The system comprises a computer, a multi-channel ultrasonic system control circuit, a motor driver board, a coreless motor, and a tube crawling machine. Multi-channel piezoelectric transducers are arranged in a circumferential direction of the furnace tube. The computer is configured to send detection instructions to the multi-channel ultrasonic system control circuit through a wireless network; the multi-channel ultrasonic system control circuit is configured to control multiple channels to simultaneously excite the piezoelectric transducers, receive echo signals from the piezoelectric transducers and then send the echo signals back to the computer in a wireless mode; and the motor driver board is configured to drive the coreless motor to drive the tube crawling machine to move, receive motion parameters fed back by motor encoders, and send the motion parameters back to the computer.

A method is provided for characterizing a part includes: a) carrying out measurements using a sensor, the sensor being placed on the part or facing the part; b) forming at least one measurement matrix using the measurements performed in step a); c) using the matrix as input datum of a convolutional neural network including an extracting block, configured to extract features from each input datum; a classifying block, configured to classify the features extracted, the classifying block outputting to at least one node; and d) depending on each node, detecting the presence of a defect in the part. The neural network employed in step c) is established using the extracting block of another previously parametrized neural network.

An ultrasonic in-situ automatic detection system for creep cracks on an inner wall of a hydrogen production furnace tube. The system comprises a computer, a multi-channel ultrasonic system control circuit, a motor driver board, a coreless motor, and a tube crawling machine. Multi-channel piezoelectric transducers are arranged in a circumferential direction of the furnace tube. The computer is configured to send detection instructions to the multi-channel ultrasonic system control circuit through a wireless network; the multi-channel ultrasonic system control circuit is configured to control multiple channels to simultaneously excite the piezoelectric transducers, receive echo signals from the piezoelectric transducers and then send the echo signals back to the computer in a wireless mode; and the motor driver board is configured to drive the coreless motor to drive the tube crawling machine to move, receive motion parameters fed back by motor encoders, and send the motion parameters back to the computer.

An ultrasonic inspection apparatus includes: an acquisition unit acquiring a signal indicating a fundamental wave and a second harmonic of an ultrasonic wave, which are obtained by the ultrasonic wave being scanned over an inspection object through a medium, at each scanning position; a calculation unit calculating a value obtained by dividing a second harmonic amplitude by a square of a fundamental wave amplitude, at each scanning position; and an output unit outputting information on a defect of the inspection object, based on the value obtained by dividing the second harmonic amplitude by the square of the fundamental wave amplitude.

A method for testing a component non-destructively, particularly for internal defects, includes the following steps: a) providing a rotationally symmetrical component having a plurality of preferably cylindrical recesses, which are arranged at one or more hole circles, b) arranging a transmitter probe serving as an ultrasound transmitter and a receiver probe serving as an ultrasound receiver spaced apart from each other outside the component such that ultrasound waves can be irradiated into a shaded area located behind one of the recesses in the component by the transmitter probe and ultrasound waves which are diffracted at least at one defect present in the shaded area can be received by the receiver probe, and c) using time of flight to determine whether one or more faults are present in the shaded area. An apparatus carries out such a method.