Sia J B, Pace D G, Osborne M W, Zanko M T, Kovzelove F
Cardiovasc Res. 1980 Aug;14(8):490-4. doi: 10.1093/cvr/14.8.490.
The flip-flop producing a pulse proportional to the transit time of an ultrasonic burst between two piezoelectric crystals was often reset by transmission artefacts in sonomicrometers. A design improvement was made. The insertion of two monostable vibrators and one nand gate corrected the resetting caused by transmission artefacts. The new design produced a flip-flop pulse that was proportional to the transit time of the ultrasonic burst through the aorta. Ascending aortic diameter was monitored in unanaesthetised dogs for 6 to 8 weeks using the new design.
产生与超声波脉冲在两个压电晶体之间的传播时间成正比的脉冲的触发器，经常会因超声微测仪中的传输伪像而复位。进行了一项设计改进。插入两个单稳态振荡器和一个与非门纠正了由传输伪像引起的复位问题。新设计产生了一个与超声波脉冲通过主动脉的传播时间成正比的触发器脉冲。使用新设计对未麻醉的狗的升主动脉直径进行了6至8周的监测。
