Interfejs IEEE 1451.4 dla czujnika drgań

W referacie przedstawiono opracowanie i wykonanie interfejsu plug and play dla czujników drgań. Czujniki skonstruowane zostały w celu zastosowania w pomiarach biomedycznych, np. dla stabilografii, pomiarów drżenia dłoni oraz badań robota kardiochirurgicznego i oparte są o akcelerometry monolityczne (głównie serii ADXL firmy Analog Devices oraz termiczne firmy MEMSIC). Interfejs umożliwia podłączenie kilku czujników drgań jednocześnie, ich automatyczną konfigurację z poziomu oprogramowania komputera osobistego i logowanie danych pomiarowych do pliku.

The design and realization of the plug-and-play interface for vibration transducers is presented in the paper. Transducers have been designed for biomedical applications, e.g. stabilography, limbs tremor examination and investigation of the cardio-surgery telemanipulator. Their performance has been optimized for both, low acceleration and low frequency measurements. The transducers are based on monolithic accelerometers of different manufacturers which have been soldered to printed circuit boards of similar size (approx. from 15´25 mm up to 18´35 mm depending on the monolithic accelerometer). A bonding of the monolithic accelerometers (and additional elements such as constant-voltage regulators, low-pass filters, sockets, etc.) with the circuit board as well as circuits that modify characteristics of the monolithic accelerometer are main reasons to perform the calibration of the transducers. Typically the transducer is connected directly to DAQ device or dedicated converter with RS232 interface to the PC, but the configuration of the transducer parameters must be carried out manually in the PC software. In this paper we propose the plug-and-play interface based on IEEE-1451.4 standard, which enables the automatic configuration thanks to the data stored in dedicated EEPROM - TEDS (Transduser Electronic DataSheet) or in a file as the Virtual TEDS.