Method and measuring system for monitoring a line for changed ambient conditions
AssigneeLEONI Kabel GmbH
InventorBernd Janssen
Life of this patent
Estimating the term…
Abstract
A method for monitoring a line for a change in ambient conditions. The line includes a measurement line of a predetermined length which has a measuring conductor enclosed in an insulation with a known dielectric coefficient. An analog signal of defined frequency is generated and injected at a feed site. The signal is reflected at a predetermined reflection site and a resulting signal amplitude is measured at a defined measuring point. A measure for the ambient condition, particularly a temperature, is determined from the signal amplitude.
Claims17
A method for monitoring a line for a change in an ambient condition, the method comprising:
- providing the line with a measuring line having a predetermined length and including a measuring conductor surrounded by an insulation;
- generating an analog signal and feeding the signal into the measuring line at a feed site, the analog signal being a periodic, continuously changing signal with a given frequency with steadily rising or falling amplitude;
- reflecting the signal at a known reflection site, a reflected signal component being returned in the measuring conductor;
- measuring a signal amplitude at a fixed measuring site, wherein a changed ambient condition leads to a changed velocity of propagation of the signal and thus a shift in the phase of the signal at a fixed measurement location, so that the signal amplitude varies at the fixed measurement location and that the signal amplitude is a measure for the changed ambient condition;
- and
- ascertaining a measure for the changed ambient condition based on the signal amplitude at the fixed measuring site.
A measuring system for monitoring a line for a changed ambient condition, the measuring system comprising:
- a measuring line having a predetermined length and including a measuring conductor surrounded by an insulation;
- a signal generator for generating an analog signal with a predefined frequency, the analog signal being a periodic, continuously changing signal with a given frequency with steadily rising or falling amplitude;
- a voltmeter for measuring a signal amplitude at a fixed measuring site on said measuring conductor, wherein a changed ambient condition leads to a changed velocity of propagation of the signal and thus to a shift in the phase of the signal at a fixed measurement location, so that the signal amplitude varies at the fixed measurement location and that the signal amplitude is a measure for the changed ambient condition;
- and
- an evaluation unit connected to receive the signal amplitude and configured for ascertaining a measure for the changed condition based on the signal amplitude measured at the measuring site.
Dependencies are inferred from the claim text.