The invention relates to the field of an
underwater sound metering test, which is mainly a
hydrophone phase low-frequency calibration tube comprising a
metal rigid tube body; the
metal rigid tube bodyis internally provided with a calibration tube cavity and an
energy converter cavity which are communicated; the calibration tube cavity is used for containing
liquid medium and forming a
liquid column, and the thickness of the tube wall of the
metal rigid tube body is larger than or equal to the
radius of the calibration tube cavity; a supporting step of the bottom part of the calibration tube cavity is provided with a soft rubber
vibrating membrane, a vibrating
piston is connected below the soft rubber
vibrating membrane, a vibrating coil is bonded and fixed at the back surface of the vibrating
piston by
epoxy resin, and the center line of the soft rubber
vibrating membrane, the center line of the vibrating
piston and the center line of the vibrating coil are completely coincided with the center line of the metal rigid tube body; and the
energy converter cavity is internally provided with a piston-type electrodynamic
energy converter. The invention has the beneficial effects of: being applicable to measurement and calibration of the small-size
hydrophone low-frequency acoustic characteristic, being characterized by
low frequency,
wide band, oil resistance, water-leakage prevention and
corrosion resistance and the like and having good time stability and temperature stability.