According to one embodiment, a control device controls a welding device performing resistance welding. When an inspection value satisfies a first condition, the control device modifies a setting value for the resistance welding and causes the welding device to perform the resistance welding. The inspection value is obtained by an inspection of a weld zone formed by the resistance welding. The control device does not cause the welding device to perform the resistance welding when the inspection value satisfies a second condition.

An acoustic bidirectional reflectance distribution function (BRDF) measurement system utilizing metamaterials and compressive sensing for measuring scattering acoustic profiles (e.g., over large angular regions, such as hemispherical scattering/emitting into two π steradians or even spherical scattering/emitting over four π steradians). The measurement system includes one or more acoustic waveguides having a curved receiving surface and made from an acoustic metamaterial configured to encode as a sound signal a frequency and directionality of a sound input received from a sample. Each acoustic waveguide includes an acoustic sensor for detecting the encoded sound signal from the metamaterial.

Method for manufacturing a pipe for a pipeline, wherein at least part of the pipe is manufactured by additive manufacturing process, wherein at least one space for an ultrasonic transducer is formed inside the material of the pipe during the additive manufacturing process. The additive manufacturing process is interrupted before the space in closed, and the ultrasonic transducer is inserted in the open space, and the additive manufacturing process for manufacturing the pipe is continued. The invention also relates to such a pipe.

The disclosure relates to an ultrasonic detection system in an arrangement for handling screening material, e.g. aggregate, ore or similar. The ultrasonic detection system includes an ultrasonic transmitter arranged at a surface of the arrangement, and adapted to send out an ultrasonic signal towards the surface, an ultrasonic receiver arranged at the surface, and adapted to receive the ultrasonic signal, and a control unit connected to the at least one ultrasonic transmitter and the at least one ultrasonic receiver. The disclosure also relates to a method for monitoring operation of an arrangement for handling screening material.

An acoustic bidirectional reflectance distribution function (BRDF) measurement system utilizing metamaterials and compressive sensing for measuring scattering acoustic profiles (e.g., over large angular regions, such as hemispherical scattering/emitting into two π steradians or even spherical scattering/emitting over four π steradians). The measurement system includes one or more acoustic waveguides having a curved receiving surface and made from an acoustic metamaterial configured to encode as a sound signal a frequency and directionality of a sound input received from a sample. Each acoustic waveguide includes an acoustic sensor for detecting the encoded sound signal from the metamaterial.

Methods, systems, and devices for determining an acoustic parameter of a downhole fluid using an acoustic assembly. Methods include transmitting a plurality of pulses; measuring values for at least one wave property measured for reflections of the plurality of pulses received at at least one acoustic receiver, including: a first value for a first reflection traveling a first known distance from a first acoustically reflective surface having a first known acoustic impedance, a second value for a second reflection traveling a second known distance substantially the same as the first known distance from a second acoustically reflective surface having a second known acoustic impedance, and a third value for a third reflection traveling a third known distance from a third acoustically reflective surface having a third known acoustic impedance substantially the same as the second acoustic impedance; and estimating the acoustic parameter using the values.

A system for detecting the presence of bubbles in a solution includes an ultrasonic receiver, receiving a pair of signals having different frequencies after passage through the solution, and a computing unit. The computing unit computes a signal value for each of the signals, the signal value representing a defined signal property, compares the signal values for the signals with each other and/or each with a predefined reference value, and computes a deviation of the signal values from each other and/or between the signal values and the predefined reference value. The computing unit generates a bubble confirmation signal that confirms the presence of bubbles in the solution if the deviation is greater than a predefined threshold value.

A method for detecting a property of a liquid medium comprises generating an ultrasonic pulse, receiving a first echo and a second echo of the ultrasonic pulse transmitted through the liquid medium, and generating a first amplitude signal for the first echo and a second amplitude signal for the second echo. The method includes calculating an amplitude signal ratio between the first amplitude signal and the second amplitude signal and determining a property signal representing the property of the liquid medium.

Systems and techniques are described making use of a vibratory transducer and a reflector spaced from the vibratory transducer to form a cavity for receiving a fluid between the vibratory transducer and the reflector, wherein the vibratory transducer is vibrated to generate a wave in the cavity, which propagates through fluid in the cavity from a surface of the vibratory transducer and is being reflected by the reflector to generate a counter-propagating wave in the cavity. Based on the wave generated at the vibratory transducer and the counter-propagating wave generated at the reflector in combination, an indication of the energy returned to the vibratory transducer by the reflector is determined. One or more material properties of the fluid are determined based on the determined indication of the energy returned to the vibratory transducer.

Refrigerant leak detection systems as well as related climate control systems and methods are disclosed herein. In an embodiment, the refrigerant leak detection system includes a transmitter configured to emit an acoustic wave, and a receiver configured to detect the acoustic wave. The transmitter and the receiver are mounted within a space outside a conduit configured to carry a refrigerant of a climate control system. In addition, the refrigerant leak detection system includes a controller coupled to the transmitter and the receiver. The controller is configured to: determine a time of flight for the acoustic wave between the transmitter and the receiver, and determine whether a refrigerant is present in the space based on the time of flight.