Capteurs de force

Les capteurs de force Brüel & Kjaer (ou cellules de force) offrent une électronique intégrée conçue pour les essais en dynamique des structures. Les capteurs se caractérisent par une fréquence de résonance très élevée, permettant de mesurer les phénomènes transitoires de courtes durées. Nos capteurs brevetés sont généralement utilisés pour mesurer les forces appliquées et peuvent être directement fixés entre la tige d’excitation et le specimen d'essai - idéal pour les mesures de force dans les applications de dynamique de structures..

What is a Force Transducer

 

What is a Force Transducer

Brüel & Kjær force transducers provide integral electronics designed for dynamic, short-duration static and impact force measurements. The transducers are typically used for measuring applied forces in modal applications, for example, inserted directly between an exciter and the test structure or for general-purpose force measurements within process applications.

The transducers are mounted using the 28 UNF tapped holes on the top and bottom of the body, and feature a 10 - 32 UNF side connector.

Characteristics

The transducers work on the piezoelectric effect of quartz, which when stressed, in this case compressed, gives an electrical charge proportional to the compressing force. This charge is converted to a low-impedance voltage output and the sensitivity is therefore expressed in terms of voltage per unit force (mV/N).

The housing material is stainless steel giving a very stiff and rigid construction.

Calibration of Force Sensitivity

The transducers are supplied with an individual calibration of the sensitivity. The transducer is mounted on the test structure so that the force to be measured is transmitted through the transducer. When used with an exciter, the transducer signal can be used to measure and control the applied force. The frequency response function of the test structure can then be measured and analysed using a stationary or hand-held dual-channel analyzer.

  • Type 8230 has a sensitivity of 110 mV/N (500 mV/lbf).
  • Type 8230-001 has a sensitivity of 22 mV/N (100 mV/lbf).
  • Type 8230-002 has a sensitivity of 2.2 mV/N (10 mV/lbf).
  • Type 8230-003 has a sensitivity of 0.2 mV/N (1 mV/lbf).

The ultimate goal of using a piezoelectric force transducer is to measure the input force of an accelerometer (or laser velocity transducer), in applications where you want to measure the impulse response of a structure.