[특허]Apparatus and method for sensing a liquid with a single wire transmission line

[미국특허] Apparatus and method for sensing a liquid with a single wire transmission line 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01F-023/28 G01R-027/06
출원번호	US-0567581 (1975-04-14)
발명자 / 주소	Ross Gerald F. (Lexington MA)
출원인 / 주소	Sperry Rand Corporation (New York NY 02)
인용정보	피인용 횟수 : 66 인용 특허 : 0

초록 ▼

A method and apparatus for measuring the level and dielectric constant of a liquid which includes a device for generating a subnanosecond baseband pulse that propagates through a transition device to a single wire transmission line that extends through an air filled region into the liquid. A discontinuity created at the air liquid interface produces a reflection of the baseband pulse that is compared with the transmitted pulse with respect to time of arrival and amplitude to determine the liquid level and the reflection coefficient at the air liquid interface. The reflection coefficient is then utilized to determine the dielectric constant of the liquid.

대표청구항 ▼

An apparatus for sensing a liquid comprising: means for generating baseband probe pulses of subnanosecond duration; transition means coupled to said probe pulse generator means for converting a coaxial transmission line to a single wire transmission line, said single wire transmission line extending substantially perpendicularly to the surface of said liquid and extending therethrough, said wire providing a means for conducting said probe pulse to said liquid surface and for conducting reflections of said probe pulse from said liquid surface to said transition means; coarse level increment generator means for producing pulses at a periodic rate in response to a probe pulse coupled from said probe pulse generator means, said periodic pulses defining a sequence of predetermined time intervals within which each time interval is representative of a coarse level increment for said liquid level measurement; coarse level increment selector means for providing a selector pulse representative of one of said coarse range increments, one selector pulse generated for each probe pulse generated by said probe pulse generator means with each of said selector pulses representative of a predetermined coarse level increment; gating means, having input terminals coupled to said coarse level increment generator means and to said coarse level increment selector means, for providing a trigger pulse at an output terminal when one of said periodic pulses and said selector pulse are simultaneously coupled to said input terminal; and fine level readout means, having a first input terminal coupled to said transition means to receive said reflected probe pulse and a second input terminal coupled to said output terminal of said gating means, for determining a fine level within the one of said coarse level increments selected by said coarse level increment selector in response to said trigger pulse coupled from said gating means and said reflected probe pulse coupled from said transition means.

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[미국특허] Apparatus and method for sensing a liquid with a single wire transmission line 원문보기

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