EP 3894820 A1 20211020 - SENSOR ARRANGEMENT WITH A PIEZOELECTRIC SENSOR AND A MEASURING AMPLIFIER
Title (en)
SENSOR ARRANGEMENT WITH A PIEZOELECTRIC SENSOR AND A MEASURING AMPLIFIER
Title (de)
SENSORANORDNUNG MIT EINEM PIEZOELEKTRISCHEN SENSOR UND MIT EINEM MESSVERSTÄRKER
Title (fr)
DISPOSITIF CAPTEUR PRÉSENTANT UN CAPTEUR PIÉZOÉLECTRIQUE ET UN AMPLIFICATEUR DE MESURE
Publication
Application
Priority
- EP 18212659 A 20181214
- EP 2019084687 W 20191211
Abstract (en)
[origin: WO2020120593A1] The invention relates to a sensor arrangement (0) with a piezoelectric sensor (1) and a measuring amplifier (3), the piezoelectric sensor (1) being electrically connected to the measuring amplifier (3), the piezoelectric sensor (1) providing electrical polarisation charges (Q, Q'), and the measuring amplifier (3) amplifying the electrical polarisation charges (Q, Q') of the piezoelectric sensor (1). The measuring amplifier (3) has at least one operational amplifier (33, 33') with two operational amplifier inputs (331, 331', 332, 332') and one operational amplifier output (333, 333'). The electrical polarisation charges (Q, Q') are present at a first operational amplifier input (331, 331') and an electric voltage (US, US', UK, UK') is present at both operational amplifier inputs (331, 331', 332, 332'), the electrical voltage (US, US', UK, UK') being not equal to a ground potential (U0) of the measuring amplifier (3). The electrical voltage (US, US') present at the first operational amplifier input (331, 331') is an electrical interference voltage (US, US'), the electrical interference voltage (US, US') coming from an electrical thermocurrent (IT, IT') generated in the piezoelectric sensor (1).
IPC 8 full level
G01L 23/22 (2006.01); H03F 3/45 (2006.01)
CPC (source: EP)
G01L 23/222 (2013.01); G01L 23/225 (2013.01); H03F 3/45475 (2013.01); H03F 2200/261 (2013.01); H03F 2203/45138 (2013.01)
Citation (search report)
See references of WO 2020120593A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
DOCDB simple family (application)
EP 2019084687 W 20191211; EP 19813912 A 20191211