Lecture 6 
UNDERWATER SOUND CALIBRATION STATIONS AT 
LE BRUSC LABORATORY 
Meupettoocher-ne-ieni cmc: 
6.1 Hydrophone Calibration 
6.1.1 Electrodynamic C 
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alibration by Discharge 
into a Ballistic Galvanometer............ 
6.1.2 Absolute Electros 
tatic Calibration ...... 30 
6.1.3 Relative Electrostatic Calibration ........ 
6.1.4 Closed-Tank Pressure-Calibration 
Technique .... 
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6.1.5 Calibration by Comparison Using Filtered 
6.2 Transducer Calibration 
6.2.1 Impedance Measurements .............-. 
Lecture 7 
6.2.2 Principle of the P 
6.2.2.1 Separation 
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6.2.2.4 Size of the 
Anechoic Tank ..... nite e0 
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6.2.3 Application of the 
Pulse Method for 
Reciprocity Calibration................ 
6.2.3.1 Calibration by Comparison ........ 
6.2.3.2 Directivity Measurements ......... 
6.2.3.3 Transpare 
6.3 Test-and-Calibration B 
Harbour of Le Brusc . 
6.3.1 Mission ...... 
ncy Measurements....... 
arge Moored in the 
6.3.2 Physical Features and Layout ........... 
6.3%3) Electaical Installlationys 5 20) c).se ere «a ele @ 
6.3.4 Water Depth... 
6.4 Test-and-Calibration B 
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arge of the Lake of 
6.4.1 Introduction: History ...............4.. 
6.4.2 General Descripti 
6.4.3 The Test-and-Cal 
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ibration Barge.......... 
6.4.3.1 General Layout ....... O.oRO) Or OF a lOABIE 
6.4.3.2 Mechanica 
6.4.3.3 Electrical 
1 Operating Gear ........ 
Installation............ 
6.4.3.4 Acoustical Test-and-Calibration 
Facilities 
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SOME AREAS IN WHICH UNDERWATER ACOUSTICS 
RESEARCH IS NEEDED 
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7.1 Sound Transducers 
ix 
125 
103 
125 
