Dif­fer­en­tial In-Line Charge Am­pli­fi­er

Ap­pli­ca­tion in Gas Tur­bines

A typ­i­cal ap­pli­ca­tion of such a mea­sure­ment chain is the mea­sure­ment of pres­sure in com­bus­tion cham­bers of sta­tion­ary gas tur­bines in order to iden­ti­fy ther­moa­cous­tic com­bus­tion in­sta­bil­i­ties. For this pur­pose, the volt­age sig­nal that the charge am­pli­fi­er gen­er­ates is sam­pled by an ana­log input mod­ule (e.g. AD4 IEPE). The IFTA Ar­gusOMDS sys­tem per­forms spe­cial analy­ses of the fre­quen­cy and time do­mains and, via a com­mu­ni­ca­tion in­ter­face with the gas tur­bine con­troller, pro­tects the ma­chine against dam­age caused by com­bus­tion os­cil­la­tions. Ef­fec­tive com­pen­sa­tion for sen­sor "shots" is par­tic­u­lar­ly im­por­tant with such ap­pli­ca­tions, so that cost­ly un­nec­es­sary ma­chine shut­downs can be avoid­ed. In com­bi­na­tion with the IFTA Ar­gusOMDS, the charge am­pli­fi­er with piezo­elec­tric high-tem­per­a­ture sen­sors is used on sta­tion­ary gas tur­bines to pro­tect against ther­moa­cous­tic vi­bra­tions in com­bus­tion cham­bers.