Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC.          Underwater Acoustics

Sonar Transducer Impedance Matching and Tuning

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.

  Single Frequency Impedance Matching Dual Frequency Impedance Matching
BII-6010 Series Yes, between 30Hz and 50kHz No
BII-6020 Series Yes, between 5kHz and 1MHz No
BII-6030 Series Yes, between 100kHz and 3MHz No
BII-6040 Series Yes, between 5kHz and 5MHz No
BII-6050 Series No Yes, between 5kHz and 1MHz
(such as 200kHz and 33kHz, etc...)

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

Output Type of Power Amplifier BII-6000 Series Standard BII-6000 Series Push-pull Type
Single-ended output OK
No
Differential/Bridge Mode Output OK No
Half-bridge Output OK No
H-bridge/Full-bridge Output OK No
Open collector (open drain) Push-pull No OK

Order Options:
1. Order detached BII-6000 component for use in your Sonar system.
2. Have Benthowave integrate BII-6000 into transducer housing for easy and fast system setup.

Custom Design of BII-6000
Note: Impedance matching can only be implemented in a narrow frequency range, Please provide us following information for customized BII-6000 series:
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

Features Related Products

Electromagnetic Shielded, Thermally Conductive, Input/Output Isolated
Parallel/Series/Hybrid Matching & Tuning, Frequency Range: 30Hz to 3MHz
Wideband, Convert electrical energy to mechanical energy efficiently

Power Amplifiers SONAR / HIFU Transducer
BII-2100 Transmitting & Receiving Switch
Underwater Transducers : SONAR, HIFU, ...


BII-6010 Series BII-6011 BII-6012
Type: 2 input/2 output wires Push-pull Centre-tapped
3 input/2 output wires
Frequency: 30Hz to 50kHz, Single Frequency 30Hz to 50kHz, Single Frequency
Power Capacity: < 250 W < 250 W
Insulation: > 500 MΩ @1000 VDC
Housing: Metal Housing
Cable: Wires
Cable Length: 1. Default: 0.2m
2. Custom
Connector: 1. Default: Wire Leads
2. BNC Male (for low voltage use ONLY <36V)
3. MIL-5015 style
4. Input: Banana Plug; Output: Banana Jack
5. Custom
Size: LxWxH Customized to meet power specs 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.

Matching & Tuning Network Matching and Tuning NetworkImpedance Matching and Tuning
BII-6020 Series BII-6021 BII-6022 BII-6023 BII-6024
Type: 2 input/2 output wires 2 input/2 output wires Push-pull Centre-tapped
3 input/2 output wires
Push-pull Centre-tapped
3 input/2 output wires
Frequency: 5kHz to 1MHz
Single Frequency
5kHz to 1MHz
Single Frequency
5kHz to 1MHz
Single Frequency
5kHz to 1MHz
Single Frequency
Power Capacity: < 2000 W < 2000 W < 2000 W < 2000 W
Insulation: > 500 MΩ @1000 VDC > 500 MΩ @1000 VDC > 500 MΩ @1000 VDC > 500 MΩ @1000 VDC
Housing: Molded Metal Housing Molded Metal Housing
Cable: 1. Wires (default)
2. Shielded Cable
3. Coax RG58
4. Custom
N/A 1. Wires (default)
2. Shielded cable
3. Coax RG58
4. Custom
N/A
Cable Length: 1. Default: 0.1m
2. Custom
N/A 1. Default: 0.1m
2. Custom
N/A
Connector: 1. Default: Wire Leads
2. BNC Male (<36V ONLY)
3. MIL-5015 style
4. Input: Banana Plug
    Output: Banana Jack
5. Custom
Input: Binding Post
Output: Binding Post
1. Default: Wire Leads
2. BNC Male (<36V ONLY)
3. MIL-5015 style
4. Input: Banana Plug
    Output: Banana Jack
5. Custom
Input: Binding Posts
Output: Binding Post
Size: ΦDxH:
69x42 or 69x48 mm
LxWxH:
138x61x56 mm
Four mounting holes.
ΦDxH
69x42 or 69x48 mm
LxWxH:
138x61x56 mm
Four mounting holes.
BII-6030 Series BII-6031 BII-6032 BII-6033 BII-6034
Type: 2 input/2 output wires 2 input/2 output wires Push-pull Centre-tapped
3 input/2 output wires
Push-pull Centre-tapped
3 input/2 output wires
Frequency: 100kHz to 3MHz
Single Frequency
100kHz to 3MHz
Single Frequency
100kHz to 3MHz
Single Frequency
100kHz to 3MHz
Single Frequency
Power Capacity: < 2000 W < 2000 W < 2000 W < 2000 W
Insulation: > 500 MΩ @1000 VDC > 500 MΩ @1000 VDC > 500 MΩ @1000 VDC > 500 MΩ @1000 VDC
Housing: Molded Metal Housing Molded Metal Housing
Cable: 1. Wires (default)
2. Shielded Cable
3. Coax RG58
4. Custom
N/A 1. Wires (default)
2. Shielded cable
3. Coax RG58
4. Custom
N/A
Cable Length: 1. Default: 0.1m
2. Custom
N/A 1. Default: 0.1m
2. Custom
N/A
Connector: 1. Default: Wire Leads
2. BNC Male (<36V ONLY)
3. MIL-5015 style
4. Input: Banana Plug
    Output: Banana Jack
5. Custom
Input: Binding Post
Output: Binding Post
1. Default: Wire Leads
2. BNC Male (<36V ONLY)
3. MIL-5015 style
4. Input: Banana Plug
    Output: Banana Jack
5. Custom
Input: Binding Posts
Output: Binding Post
Size: ΦDxH:
33x20 or 33x30 mm
42x20 or 42x30 mm
Custom to transducer
LxWxH:
115x39x56 mm
Four mounting holes.
ΦDxH
33x20 or 33x30 mm
42x20 or 42x30 mm
Custom to transducer
LxWxH:
115x39x56 mm
Four mounting holes.
BII-6040 Series BII-6041 BII-6042 BII-6043 BII-6044
Type: 2 input/2 output wires 2 input/2 output wires Push-pull Centre-tapped
3 input/2 output wires
Push-pull Centre-tapped
3 input/2 output wires
Frequency: 5kHz to 5MHz
Single Frequency
5kHz to 5MHz
Single Frequency
5kHz to 5MHz
Single Frequency
5kHz to 5MHz
Single Frequency
Power Capacity: < 500 W < 500 W < 500 W < 500 W
Insulation: > 500 MΩ @1000 VDC > 500 MΩ @1000 VDC > 500 MΩ @1000 VDC > 500 MΩ @1000 VDC
Housing: Molded Metal Housing Molded Metal Housing
Cable: 1. Wires (default)
2. Shielded Cable
3. Coax RG58
4. Custom
N/A 1. Wires (default)
2. Shielded cable
3. Coax RG58
4. Custom
N/A
Cable Length: 1. Default: 0.1m
2. Custom
N/A 1. Default: 0.1m
2. Custom
N/A
Connector: 1. Default: Wire Leads
2. BNC Male (<36V ONLY)
3. MIL-5015 style
4. Input: Banana Plug
    Output: Banana Jack
5. Custom
Input: Binding Post
Output: Binding Post
1. Default: Wire Leads
2. BNC Male (<36V ONLY)
3. MIL-5015 style
4. Input: Banana Plug
    Output: Banana Jack
5. Custom
Input: Binding Posts
Output: Binding Post
Size: ΦDxH:
48x28 or 48x43 mm
Custom to transducer
LxWxH:
138x61x56 mm
Four mounting holes.
ΦDxH
48x28 or 48x43 mm
Custom to transducer
LxWxH:
138x61x56 mm
Four mounting holes.
BII-6050 Series BII-6051 BII-6052
Type: 3 input/2 output wires 3 input/2 output wires
Frequency: 5kHz to 1MHz, Dual Frequencies 5kHz to 1MHz, Dual Frequencies
Power Capacity: < 2000 W < 2000 W
Insulation: > 500 MΩ @1000 VDC > 500 MΩ @1000 VDC
Housing: Molded Metal Housing
Cable: 1. Wires (default)
2. Shielded Cable
3. Coax RG58
4. Custom
N/A
Cable Length: 1. Default: 0.1m
2. Custom
N/A
Connector: 1. Default: Wire Leads
2. BNC Male (<36V ONLY)
3. MIL-5015 style
4. Input: Banana Plug
    Output: Banana Jack
5. Custom
Input: Binding Post
Output: Binding Post
Size: ΦDxH:
69x42 or 69x48 mm
Custom to transducer
LxWxH:
138x61x56 mm
Four mounting holes.
Warning: Connector BNC is for low voltage use ONLY, <36V.

Wiring

Molded Unit with RG58 Coax/BNC and Metal Housing with Binding post

Signals Molded Unit (RG58 Coax/BNC) Metal Housing with Binding Post
Signal from Power Amplifier Coax Cable with Label "I" PA Binding Post:
Signal to Sonar/HIFU Transducer Coax Cable with Label "O" Transducer Binding Post

Molded Unit with RG58 Coax/BNC and Shielded Cable/MIL-5015 Connector (Female)
Signal from Power Amplifier Signal to Sonar/HIFU Transducer
Coax RG58/BNC (male) Shielded Cable/MIL-5015 Connector (Female)
Coax Conductor: Signal
Coax Shield: Common/Grounding
Receptacle A: Common/Grounding; Shield of Cable.
Receptacle B: To Transducer -;     Black Wire of Cable.
Receptacle C: to Transducer +;     Red Wire of Cable.

Molded Unit with Shielded Cable/MIL-5015 Connector (Male) and Shielded Cable/MIL-5015 Connector (Female)
Signal from Power Amplifier Signal to Sonar/HIFU Transducer
Shielded Cable/MIL-5015 Connector (Male) Shielded Cable/MIL-5015 Connector (Female)
Pin A: Common/Grounding;                  Shield of Cable.
Pin B: from Out - of Power Amplifier;     Black Wire of Cable.
Pin C: from Out + of Power Amplifier;    Red Wire of Cable.
Receptacle A: Common/Grounding;     Shield of Cable.
Receptacle B: To Transducer -;         Black Wire of Cable.
Receptacle C: to Transducer +;         Red Wire of Cable.

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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