| 摘要 |
<p>In obtaining Karman's vortex street pulses by converting the outputs of the Karman's vortex street flow-rate sensor into binary outputs, the operation constant of the binary circuit is changed depending upon the operation condition of the engine; therefore, this invention is effective in generating true Karman's vortex street pulses at all times. Further, the content of the counter is latched at a timing of a pulse obtained by shaping the wave form of a received wave whose phase is modulated with Karman's vortex street, in order to demodulate the phase which is then converted into a binary value; therefore, most of the signals can be processed at a level of a digital signal: that is, the apparatus can be easily realized in the form of a digital IC, and a flow-rate measuring apparatus which is small and light in weight can be obtained at a low cost.</p> |
