Device for measuring moisture in overlays (like hair) of a microstrip directional coupler

A sensor for measuring moisture content of a sample like hair, comprising: a micorstrip line; a directional coupler having a pair of generally parallel first (3) and second (4) strips defining a coupling gap therebetween; and a high frequency signal generator electrically coupled to said first strip...

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Main Authors SHERMAN, FAIZ FEISAL, GARTSTEIN, VLADIMIR, MOORE, DAVID BURTON
Format Patent
LanguageEnglish
Published 20.10.2011
Subjects
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
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Abstract A sensor for measuring moisture content of a sample like hair, comprising: a micorstrip line; a directional coupler having a pair of generally parallel first (3) and second (4) strips defining a coupling gap therebetween; and a high frequency signal generator electrically coupled to said first strip (3) and operable to couple power to said second strip (4) with the sample placed as an overlay across said coupling gap to thereby generate a coupled power signal in said second strip having an amplitude related to moisture content of the sample. The coupled power signal from strip (4) is phase (13) shifted by the microstrip line and coupled to one port of a mimixer (12). The forward power signal from strip (3) is coupled to the other part of mixer (12).
AbstractList A sensor for measuring moisture content of a sample like hair, comprising: a micorstrip line; a directional coupler having a pair of generally parallel first (3) and second (4) strips defining a coupling gap therebetween; and a high frequency signal generator electrically coupled to said first strip (3) and operable to couple power to said second strip (4) with the sample placed as an overlay across said coupling gap to thereby generate a coupled power signal in said second strip having an amplitude related to moisture content of the sample. The coupled power signal from strip (4) is phase (13) shifted by the microstrip line and coupled to one port of a mimixer (12). The forward power signal from strip (3) is coupled to the other part of mixer (12).
Author SHERMAN, FAIZ FEISAL
MOORE, DAVID BURTON
GARTSTEIN, VLADIMIR
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Snippet A sensor for measuring moisture content of a sample like hair, comprising: a micorstrip line; a directional coupler having a pair of generally parallel first...
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SubjectTerms INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
Title Device for measuring moisture in overlays (like hair) of a microstrip directional coupler
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