[특허]Apparatus and method for improving a time domain reflectometer

Apparatus and method for improving a time domain reflectometer 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01R-031/11
출원번호	US-0255352 (1994-06-08)
발명자 / 주소	Borchert Marshall B. (5101 N. 57th St. Lincoln NE 68507) Hartzell Douglas A. (5101 N. 57th St. Lincoln NE 68507) Thomassen Edward J. (5101 N. 57th St. Lincoln NE 68507) Rezac Lee M. (5101 N. 57th St.
인용정보	피인용 횟수 : 115 인용 특허 : 0

초록 ▼

A method for detecting impedance discontinuities in two-conductor cable includes the initial step of transmitting a pulse of energy onto the cable and receiving any reflected pulses at a base location. The distance to the discontinuity is calculated by measuring the elapsed time between the transmitted and received pulses. A waveform is created on a display screen to shown the transmitted and reflected pulses, by taking a plurality of horizontal samples along the cable, and calculating a vertical value for each horizontal sample taken. Each horizontal sample is then converted to digital form and displayed on the screen. Another step in the method includes determining the gauge of the cable and then subtracting the exponential decay of the transmitted pulse waveform based upon that determined cable gauge so as to create a modified transmitted pulse which is displayed on the screen. The method also includes the step of adjusting the calculation of the distance to the discontinuity so as to account for a decrease in the velocity of propagation of the transmitted and received pulses over the length of the cable. A method for detecting a bridge tap in a twisted pair cable includes the steps of transmitting a pulse of energy onto the cable and receiving any reflected energy pulses at a base location. The gauge of the cable is then determined and the phase of any reflected energy pulses are determined. The amplitude and distance from the base location is determined for each reflected pulse which is out of phase relative to the transmitted energy pulse, to create pulse values. These pulse values are then compared with predetermined pulse values for the particular cable gauge and type to identify the location of a pulse value which is within a predetermined range of pulse values for a bridge tap discontinuity.

대표청구항 ▼

A method for detecting impedance discontinuities in two-conductor cable and displaying their location, comprising the steps of: transmitting a pulse of energy on to the cable at a base location; receiving any reflected pulses at the base location; measuring the elapsed time from the transmission of the pulse to the receipt of any reflected pulses; calculating the distance from the base location to a discontinuity causing a reflected pulse; determining the gauge of the cable; determining the exponential decay of the waveform of the transmitted pulse based upon the determined cable gauge; subtracting the exponential decay from the value of the transmitted pulse to create a modified transmitted pulse value; and creating a waveform on a display screen showing the modified transmitted pulse and any reflected pulses.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Apparatus and method for improving a time domain reflectometer 원문보기

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Apparatus and method for improving a time domain reflectometer 원문보기

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