Piezoelectric transducer

A piezoelectric transducer for measuring a force comprising

• a base element;
• a pre-loading element;
• at least one effective main seismic mass means capable of producing said force when being accelerated, said effective main seismic mass means being joined by said pre-load element directly or indirectly against said base element;
• a main piezoelectric ceramic element comprising first piezoelectric ceramic, said first piezoelectric ceramic is capable of generating a main electric charge when subjected to said force, said main piezoelectric ceramic element being joined by said pre-load element directly or indirectly against said effective main seismic mass means;
• at least one compensation seismic mass means capable of producing a compensation force when being accelerated, said compensation seismic mass means being joined by said pre-load element directly or indirectly against said base element;
• a compensation piezoelectric ceramic element comprising second piezoelectric ceramic, said second piezoelectric ceramic is capable of generating a compensation electric charge when subjected to said compensation force, said compensation piezoelectric ceramic element being joined by said pre-load element directly or indirectly against said compensation seismic mass means;
• said first piezoelectric ceramic has a thermal sensitivity shift smaller than said second piezoelectric ceramic;
• said first piezoelectric ceramic generates main electric charge that is larger in quantity than compensation electric charge generated by said second piezoelectric ceramic;
• and
• said main piezoelectric ceramic element being oriented with respect to said force to be measured and said compensation piezoelectric ceramic element being oriented with respect to said compensation force such that said main electric charge and said compensation electric charge are opposite in polarity.