A transducer assembly is provided. The transducer assembly includes a magnetic portion, a body, a tensile pulse transmitter, and a pulse and current control unit. The magnetic portion is configured to provide a magnetic field. The body is disposed within an opening of the magnetic portion, and has a conductive portion configured to pass electric current near a body surface oriented toward the test surface. The tensile pulse transmitter is disposed within a cavity of the body and configured to transmit a tensile pulse into the test object. The pulse and current control unit is configured to control the tensile pulse transmitted by the tensile pulse transmitter, and to provide a current that passes through the conductive portion of the body and the test object, whereby a force urging the transducer assembly and the test object toward each other is generated responsive to the magnetic field and the current.

An outer part for a device which is attachable thereto as a housing and/or an attachment part, a first reflective surface and a second reflective surface being formed on the outer part so that at least one signal emitted by an optical and/or acoustic source is directly or indirectly deflectable onto at least one detector surface of an optical and/or acoustic detector, an optical path being configured as a cavern or continuous recess in the outer part or as a depression of a boundary surface of the outer part, the optical path having at least one opening via which at least one substance is transferable into the optical path, and the at least one signal being deflectable into the optical path to the second reflective surface which is formed at a second end of the optical path with the first reflective surface at a first end of the optical path.

The invention is a method for the nondestructive examination of a test specimen using ultrasound. Ultrasonic waves are coupled into the test specimen with ultrasonic transducers. Ultrasonic waves, which are reflected within the test specimen, are received by the ultrasonic transducers and converted into ultrasonic signals. The method determines an average noise level, to which all discrete signal information is subjected, determines volume elements assigned to each discrete signal information having a signal level with a signal-to-noise ratio R (which is referred to as an average noise level), of 6 dB≤R, determines pairs of volumes separated by a distance A which is equal to or less than a wavelength of the ultrasonic waves coupled into the test specimen. Volumes are combined into a group and the discrete signal information is evaluated, based on at least one of polarization, frequency, wave type and wave mode.

The invention is a method for the nondestructive examination of a test specimen by use of ultrasound, in which ultrasonic waves are coupled into the test specimen with ultrasonic transducers and ultrasonic waves reflected within the test specimen are received by the ultrasonic transducers and converted into ultrasonic signals. The ultrasonic signals are stored and subsequently divided into discrete signal information by use of a propagation time-based, phase-corrected superposition in a course of ultrasonic signal data processing. Discrete signal information is assigned to a volume element within the test specimen. The method determines an average noise level, to which all discrete signal information is subjected, determines voxels, assigned to discrete signal information having a signal level with a signal-to-noise ratio R which is referred to as an average noise level, with 6 dBR, determines voxels, between respective pairs when the spatial distance A is smaller than or equal to a wavelength of the ultrasonic waves coupled into the test specimen, respectively combines the determined voxels into a voxel group, and evaluates the discrete signal information, based on at least one of polarization, frequency, wave type and wave mode.

According to an exemplary embodiment in the present disclosure, a crack measurement device and a crack measurement method are provided. The crack measurement device according to an exemplary embodiment in the present disclosure includes: an ultrasonic sensor irradiating a first ultrasonic wave in a direction perpendicular to a bottom surface of an object to be inspected, so as to be focused on the bottom surface of the object to be inspected and receiving a reflected wave, reflected from the bottom surface of the object to be inspected; and a monitoring unit providing information on a crack on the basis of intensity of the reflected wave.