| 摘要 |
<p>Within the casing of the device or machine to be monitored there is at least one closely connected vibration transducer (2) with an associated wide-band amplifier (3) which drives one or more band-pass filters (5) with different cut-off frequencies which are selected within the limits of the vibration spectrum of the correct operation of the machine or device, and set individually by means of a programmable control circuit (6). The outputs of the filters (5) are compared with programmable reference voltages in corresponding comparators (10) and variations with respect to these thresholds activate optical and/or acoustic signalling systems (11) to warn the operator that the monitored device or machine is approaching or is in a state of malfunction. The use of CMOS technology and the short operating time, which does not exceed ten hours, enable the vibration transducer and the corresponding electronic circuits, the signalling means and the power supply unit (12) to be integrated within the casing of the heart-lung machine or of the part of it, for example the oxygenator, which is to be monitored. <MATH></p> |
