We have been working with well-known domestic universities, research institutes and large enterprises acoustic professional academicians, professors, engineers and other experts. We established long-term R & D and cooperative relationships with a number of acoustic research institutes in the United States, Britain, Germany, Japan and South Korea and other leading companies.

We produce a variety of acoustic transducers, and obtain array-based technology development capability for piezoelectric transducer elements and well-equipped research, manufacture and testing conditions.

Acoustic transducer performance parameters definitions and units
⒈ hydrophone receive sensitivity
Hydrophone output open-circuit voltage and acting on the surface of the hydrophone to receive the actual ratio of sound pressure, said hydrophone sound pressure sensitivity, symbol for the Mp, units of V / Pa. When expressed in decibels, the sound pressure sensitivity level, said, symbols of ML, Reference value Mref = 1V/μPa

⒉ launching transducer sends response
Launching transducer, to a certain frequency, in the specified direction of the far field from its acoustic center of a reference distance of the sound pressure and the reference distance and added to the product of the voltage ratio of the input terminal is called the sending transducer response. Symbol Sv, for each unit is Pamies volt, namely Pa • m / V. When expressed in decibels, the level that sends voltage response Sv, Reference value Svref = 1μPa • m / V

⒊ transducer directivity response plan
To the incident acoustic or acoustic far-field emission expressed as a function of the direction of the sensitivity of the transducer, or send a response variation is called directional transducer response plans, referred to as directional beam chart or diagram.

The directivity of a planar diagram can be described in polar coordinates, Cartesian coordinates can also be described. Angle in degrees that the relative response value expressed by dB. Maximum response level is taken to odB. Of course, also allows linear numerical normalized ratio to represent.

⒋ transducer electrical impedance or conductance sodium
The electrical impedance of the transducer is defined as the increase in a certain frequency electrical terminal on the transducer caused by the instantaneous voltage and instantaneous current complex than that. Symbol Z, units of ohms, or Ω.
The transducer impedance is called the inverse of the conductance of the transducer is satisfied, the symbol Y, units of the West [siemens], that is, S.

Underwater acoustic transducer electrical impedance or conductance satisfied with their live sound field and its environment (hydrostatic pressure, temperature, etc.) and electrical load (connected to cable length) and other conditions.

⒌ launching transducer input electrical power, emission sound power and electro-acoustic efficiency of
Launching transducer input electrical power is its active power absorbed by the power source. Symbols are We, unit is the watt [special], that is, W. The input power and the base ratio of electric power to the base 10 logarithm multiplied by 10 as the input power level, symbol is Lwe, units of decibels, the dB (0dB ≡ 1W).

Launching transducer transmit sound power is the medium in unit time within the sound field emitted sound energy of the effective symbol for the Wa, unit is the watt [special], that is, W. Emission sound power and sound power ratio of the base to the base 10 logarithm multiplied by 10, known as the sound power level, symbol Lwa, units of decibels, the dB (0dB ≡ 1pW).
Launch of the electro-acoustic transducer efficiency is its output acoustic power and the total electric power input ratio, expressed as a percentage symbol η to take (%).

Neither for sinusoidal sound of acoustic pulses or random noise, the sound field of a point on the sound pressure level can be expressed as Where, p, said inspection point of the RMS sound pressure (ie, both Fanggen Zhi), indicating that the benchmark value of sound pressure, SPL is sound pressure level, said symbols, units of dB.
The unit of sound pressure Pa (1Pa = 1N / m ^ 2). Is the sound pressure level of the reference value, the water the sound of the provisions of the base value of = 1μPa. While in the air the sound of the base value = 20.4μPa.