Jellyfish target strength measuring device and method

The invention discloses a jellyfish target strength measuring device and method. The device comprises: a circular support mounted underwater; a fixing device is installed over the center position of the circular support and used for fixing a jellyfish cluster. An arc-shaped track is arranged over the circular support, and a direct-current electromagnet is installed on the inner side of the arc-shaped track in the track direction. A sliding block is installed on the arc-shaped track, a permanent magnet is arranged in the sliding block, the direct-current electromagnet is connected with a controller through a direct-current motor, and the direct-current electromagnet is positively electrified by the controller, so that the sliding block slides on the arc-shaped track; the controller reversely electrifies the direct-current electromagnet, so that the sliding block is locked on the arc-shaped track; a transducer is mounted on the sliding block; when the position of the sliding block is locked, the controller send