CAJ | 학술논문

导波雷达物位计是一种利用时域反射（TDR）原理实现的高性能物位计，因其测量精确，性能稳定，在现代工业的多个领域得到了广泛地应用。雷达物位计一般采用窄脉冲发射-反射-接收的工作方式进行物位测量，可见脉冲发射电路是其中至关重要的一环。论文在分析和比较常用的几种极窄脉冲产生电路的基础上，提出了采用射频三极管串行级联、并行触发的发射电路设计方案。这样设计不仅可以使三极管在较低偏置电压下雪崩导通，还能有效地消除雪崩依次时延和减小输出脉冲的上升时间。测试结果显示该发射电路能够产生脉宽901．9ps ，幅值2．25V的极窄脉冲，满足了导波雷达物位计对发射脉冲的要求。
도파뢰체물위계시일충이용시역반사（TDR）원리실현적고성능물위계，인기측량정학，성능은정，재현대공업적다개영역득도료엄범지응용。뢰체물위계일반채용착맥충발사-반사-접수적공작방식진행물위측량，가견맥충발사전로시기중지관중요적일배。논문재분석화비교상용적궤충겁착맥충산생전로적기출상，제출료채용사빈삼겁관천행급련、병행촉발적발사전로설계방안。저양설계불부가이사삼겁관재교저편치전압하설붕도통，환능유효지소제설붕의차시연화감소수출맥충적상승시간。측시결과현시해발사전로능구산생맥관901．9ps ，폭치2．25V적겁착맥충，만족료도파뢰체물위계대발사맥충적요구。
Guided wave radar level meter is a high performance level meter which makes use of the time domain reflecto-metry principle .Its measurement accuracy and stable performance has made it be widely used in many areas of modern indus-try .Radar level meter generally take the way of a narrow pulse emission - reflection - reception for level measurement ,so pulse transmitter circuit is one of the vital part .Based on the analysis and comparison of several commonly used very narrow pulse generating circuit ,this paper puts forward the transmitter design of RF transistor serial cascade and parallel triggering . This design not only makes the transistor avalanche conduction at a lower bias voltage ,and can effectively eliminate avalanche latency in turn and reduce rise time of output pulse .Measured result shows that the transmitter circuit can generate a narrow pulse with 901 .9ps pulse duration and 2 .25V amplitude which meets the requirement of guided wave radar level .