Abstract: An external calibrating device (10) for a measurement device, which may be an acoustic camera. The calibrating device (10) includes a sound source (11) and a light source (12), which are preferably pointed to the same direction. This direction can be a horizontal direction, where the sources (11, 12) locate on the same vertical side surface of the calibrating device (10). An IR LED can be used as the light source (12). The measurement device may instruct a user how to place and align the measurement device during the calibration process. Guidance is given by instructions, volume range information, and focusing lines on the screen. When the instructions are fulfilled, the user may acknowledge the finished calibration process.

Abstract: A power system for a marine vessel comprises an engine and a controllable pitch thruster drivably coupled to the engine. A speed of the controllable pitch thruster various with a speed of the engine. A control unit receives a thrust command value indicating a thrust required from controllable pitch thruster. The control unit determines a current speed of the controllable pitch thruster and calculates a pitch of the controllable pitch thruster that produces thrust in accordance with the thrust command value at the current speed of the controllable pitch thruster. The power system allows for operating the engine at variable speeds to allow for a reduction of the engine speed under partial load conditions.

Abstract: The present invention discloses an acoustic camera which comprises an array of arranged microphones. The microphone arrangement can be organized in planar or non-planar form. The device can be handheld, and it comprises a touch screen for interacting with the user. The acoustic camera measures acoustic signal intensities in the pointed direction and simultaneously takes an optical image of the measured area, and shows the acoustic signal strengths with the taken image on the screen. The device analyzes the acoustic signals and makes a classification for the sound based on the analysis. If necessary, an alarm is given by the acoustic camera. Besides the handheld manual use, the device can be fixed on a immobile structure or fixed to a movable or rotatable device or a vehicle, such as to a drone.

Abstract: The present invention discloses an acoustic camera which comprises an array of arranged microphones. The microphone arrangement can be organized in planar or non-planar form. The device can be handheld, and it comprises a touch screen for interacting with the user. The acoustic camera measures acoustic signal inten-sities in the pointed direction and simultaneously takes an optical image of the measured area, and shows the acoustic signal strengths with the taken image on the screen. The device analyzes the acoustic signals and makes a classification for the sound based on the analysis. If necessary, an alarm is given by the acoustic camera. Besides the handheld manual use, the device can be fixed on a immobile structure or fixed to a movable or rotatable device or a vehicle, such as to a drone.

Abstract: A power system for a marine vessel comprises an engine and a controllable pitch thruster drivably coupled to the engine. A speed of the controllable pitch thruster various with a speed of the engine. A control unit receives a thrust command value indicating a thrust required from controllable pitch thruster. The control unit determines a current speed of the controllable pitch thruster and calculates a pitch of the controllable pitch thruster that produces thrust in accordance with the thrust command value at the current speed of the controllable pitch thruster. The power system allows for operating the engine at variable speeds to allow for a reduction of the engine speed under partial load conditions.