Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC.          Underwater Acoustics

Sonar Transducer Impedance Matching and Tuning

Sonar Transducer Impedance Matching and TuningImpedance Matching and TuningImpedance Matching and TuningImpedance Matching and TuningImpedance Matching and TuningImpedance Matching and TuningImpedance Matching and Tuning

BII-6000    Matching and Tuning Network

Transducers made from piezoelectric materials transform the electric energy to mechanical energy by converse piezoelectric effect. The impedance of a piezoelectric transducer is frequency-dependent ranging from several kiloohms to several ohms, and is of capacitive, resistive or inductive load to a power amplifier at different frequency ranges. A impedance matching/tuning unit is necessary to change the impedance of the transducer to meet the load requirements of the power amplifier for maximum and efficient power delivery from the electric to the mechanical.

Besides, components BII-6000 are designed to provide wideband performance for SONAR and communication applications where complex waveforms with higher harmonics must be transformed with low distortion.

Underwater transducers (projectors, acoustic sources) are designed to transmit energy efficiently at a particular frequency (resonance) or in its  frequency bandwidth. Therefore, customized BII-6000s are designed for use in this particular frequency (resonance) or frequency bandwidth of the transducers. Please specify the frequency or frequency span when ordering BII-6000.

How to choose output type of a power amplifier to work with BII-6000:

  BII-6000 BII-6000PP
Output Type of Power Amplifier Single-ended output
Differential/Bridge Mode Output
Half-bridge Output
H-bridge/Full-bridge Output
Open collector (open drain) Push-pull

Order Options:
1. Order the BII-6000 component to be integrated into your Sonar system by yourself for flexibility.
2. Have Benthowave integrate BII-6000 into transducer housing for easy and fast system setup.

Custom Design of BII-6000
Please provide us following information for customized BII-6000:
1. Load requirements of your power amplifier.
2. One of following parameters of your transducer.
3. Operating frequency or bandwidth of the transducer.
4. Customized size requirements if any.

Equivalent Circuit Complex Impedance Admittance
C0, Cm, Lm, Rm+Rw
Testing Frequency
Z = |Z|∠θ  or Z = R + jX, Testing Frequency
Z - Complex Impedance; |Z| - Magnitude; θ - Phase;
R - Resistance; X - Reactance.
Y = G + jB, Testing Frequency
Y - Admittance; G - Conductance; B - Susceptance.

 

Impedance Matching Network    Impedance Matching and Tuning

Underwater Transducer Underwater Transducer

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Underwater Transducers : SONAR, HIFU, ...


Matching
&
Tuning
Network
Matching and Tuning NetworkImpedance Matching and Tuning
BII-6000 Series BII-6001 BII-6002 BII-6003 BII-6004
Type: 2 input/2 output wires 2 input/2 output wires 2 input/2 output wires 2 input/2 output wires
BII-6000 Series BII-6001PP BII-6002PP BII-6003PP BII-6004PP
Type: Push-pull Centre-tapped
3 input/2 output wires
Push-pull Centre-tapped
3 input/2 output wires
Push-pull Centre-tapped
3 input/2 output wires
Push-pull Centre-tapped
3 input/2 output wires
Frequency: 30Hz to 50kHz 5kHz to 500kHz 100kHz to 3MHz 5kHz to 500kHz
Power: < 250 W < 2000 W < 2000 W < 500 W
Insulation: > 500 MΩ @1000 VDC > 500 MΩ @1000 VDC > 500 MΩ @1000 VDC > 500 MΩ @1000 VDC
Cable Length: 1. Default: 0.2m
2. Custom
1. Default: 0.1m
2. Custom
1. Default: 0.1m
2. Custom
1. Default: 0.1m
2. Custom
Connector: 1. Default: Wire Leads
2. MIL-5015 style
3. Primary: Banana Plug
    Secondary: Banana Jack
4. Custom
1. Default: Wire Leads
2. MIL-5015 style
3. Primary: Banana Plug
    Secondary: Banana Jack
4. Custom
1. Default: Wire Leads
2. MIL-5015 style
3. Primary: Banana Plug
    Secondary: Banana Jack
4. Custom
1. Default: Wire Leads
2. MIL-5015 style
3. Primary: Banana Plug
    Secondary: Banana Jack
4. Custom
Housing: 1. Metal Housing (default)
2. Molded
1. Molded (default)
2. Metal Housing
1. Molded (default)
2. Metal Housing
1. Molded (default)
2. Metal Housing
Size:
ΦDxH
Molded Unit
N/A 69 x 42 mm
69 x 48 mm
Custom to transducer
33 x 20 mm
33 x 30 mm
42 x 20 mm
42 x 30 mm
Custom to transducer
48 x 25 mm
48 x 40 mm
Custom to transducer
Size:
LxWxH
Metal Housing
Customized to meet power specs
Four mounting holes.
With Binding Posts:
138 x 61 x 56 mm
Four mounting holes.
With Binding Posts:
115 x 39 x 56 mm
Four mounting holes.
With Binding Posts:
138 x 61 x 56 mm
Four mounting holes.
Note: Please specify the size requirements when ordering if your project has limited size available for the units. The BII-6000s' size shown in the respective specs is the ones for most transducers, but BII-6000s' size may vary according to the specific transducers and power amplifiers.

Wiring (Metal Housing with Binding Post)

PA Binding Post: Signal from Power Amplifier
Transducer Binding Post Driving Signal to Sonar Transducer

Sonar Transducer Impedance Matching and Tuning

Technical Notes

Networks used for coupling piezoelectric SONAR transducers to electronic power amplifiers may be categorized into two general types. The first and simplest of these is to correct the power factor of the piezoelectric transducers. The second and complex one is used to transform transducers' impedance to a higher or lower value.

The design of power factor correction network is quite straightforward. Engineering details (Q, magnetic material, insulation, power rating, characterization of SONAR transducers, etc.) need to be taken into account to make a successful correction network.

If a change in the impedance magnitude is desired in addition to the power factor correction of the transducers, it is necessary to design an electronic network with the tuning inductor. For inductive components to be used in audio and ultrasonic ranges, special cares have to be taken for manufacturing high value inductors and transformers with proper size, cost, losses, bandwidth, power capability and so on.

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