Apparatus for measuring the transit time of electromagnetic waves
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United States of America Patent
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Jun 25, 1996
Grant Date -
N/A
app pub date -
Feb 10, 1994
filing date -
Feb 12, 1993
priority date (Note) -
Expired
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Abstract
An apparatus for measuring the transit time of electromagnetic waves operates with pulse frequencies (9, 10), conducted in a feedback loop (12) which are supplied after passing through a measurement path (13) or through a reference path (14) to a resonator (35). As a result of an 180.degree. phase-shift of the last pulse (10) of each pulse sequence (9, 10) the resonator oscillation collapses abruptly at a specific point in time. The directly preceding zero passage of the resonator oscillation defines the time of reception of the pulse sequence.
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