| 摘要 |
<p>PURPOSE:To fetch a flow velocity detection signal without pulsating components, by providing a circuit for subtracting pulsating components extracted from an output signal of a flow velocity element from the output signal. CONSTITUTION:A waveform processing circuit 3 made up of a pulsating component extraction circuit 31 which extracts pulsating components alone from an output signal Vc of a flow velocity detection element 1 and a differential circuit 32 which subtracts the pulsating components extracted with the circuit 31 from the signal Vc. An output adjusting circuit 4 comprises a differential amplifier using an operational amplifier 84 and a buffer circuit for zero-adjustment and gain adjustment using an operational amplifier 85. Here, the pulsating components extraction circuit 31 extracts pulsating components from the signal Vc of an element 1 and the differential circuit 32 subtracts the pulsating components from the signal Vc. Thus, a flow velocity detection signal without pulsation is fetched from the output adjusting circuit 4.</p> |
