ZA934445B - Radio frequency measuring apparatus - Google Patents

Radio frequency measuring apparatus

Info

Publication number
ZA934445B
ZA934445B ZA934445A ZA934445A ZA934445B ZA 934445 B ZA934445 B ZA 934445B ZA 934445 A ZA934445 A ZA 934445A ZA 934445 A ZA934445 A ZA 934445A ZA 934445 B ZA934445 B ZA 934445B
Authority
ZA
South Africa
Prior art keywords
radio frequency
measuring apparatus
frequency measuring
radio
measuring
Prior art date
Application number
ZA934445A
Other languages
English (en)
Inventor
David John Radford
Original Assignee
David John Radford
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by David John Radford filed Critical David John Radford
Publication of ZA934445B publication Critical patent/ZA934445B/xx

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/02—Food
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2617—Measuring dielectric properties, e.g. constants
    • G01R27/2623—Measuring-systems or electronic circuits

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
ZA934445A 1992-06-22 1992-06-22 Radio frequency measuring apparatus ZA934445B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA924569 1992-06-22

Publications (1)

Publication Number Publication Date
ZA934445B true ZA934445B (en) 1994-01-24

Family

ID=25581801

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA934445A ZA934445B (en) 1992-06-22 1992-06-22 Radio frequency measuring apparatus

Country Status (5)

Country Link
US (1) US5483172A (fr)
EP (1) EP0576243B1 (fr)
DE (1) DE69323121T2 (fr)
ES (1) ES2130225T3 (fr)
ZA (1) ZA934445B (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6794886B1 (en) * 2001-11-01 2004-09-21 Kla-Tencor Technologies Corporation Tank probe for measuring surface conductance
US7278186B2 (en) * 2005-01-05 2007-10-09 Uster Technologies Ag Ultra low frequency moisture sensor
DE102006034931A1 (de) * 2006-07-28 2008-01-31 E + E Elektronik Ges.M.B.H. Schaltungsanordnung und Verfahren zur Feuchtmessung
WO2008023388A1 (fr) * 2006-08-23 2008-02-28 Budhaditya Chattopadhyay Appareil d'épuration du sang et procédé associé
GB0709313D0 (en) * 2007-05-15 2007-06-20 Siemens Ag RFID reader
NO327658B1 (no) * 2007-10-03 2009-09-07 Fmc Kongsberg Subsea As Anordning og fremgangsmate for maling av vanninnhold og saltkonsentrasjon i en flerfasefluidstrom
MX2011013486A (es) * 2009-06-26 2012-02-21 Schrader Electronics Ltd Aparato sensor del nivel y calidad de liquido, sistemas y metodos usando propagacion de ondas de campos electromagneticos.
ES2385643B1 (es) * 2009-09-23 2013-06-13 La Farga Lacambra, S.A.U. Procedimiento para estimación de la conductividad eléctrica de una aleación.
GB201011785D0 (en) 2010-07-13 2010-08-25 Oxford Rf Sensors Ltd Permittivity sensor
BR132012013280F1 (pt) * 2012-06-01 2019-01-08 Univ Federal De Pernambuco Ufpe aparelho eletrônico para monitoramento da concentração de álcool em bebidas
GB2533418A (en) * 2014-12-19 2016-06-22 Salunda Ltd Measurement of sugar in solution
DE102016212986A1 (de) 2016-07-15 2018-01-18 Volkswagen Aktiengesellschaft Flüssigkeitsmessvorrichtung und Messkopfvorrichtung zur Feuchtigkeitsdetektion, insbesondere in Behältnissen für flüssigkeitssensitive Elektrik- und/oder Elektronikkomponenten in Straßenfahrzeugen
EP3438620B1 (fr) * 2017-08-02 2020-09-30 Melexis Technologies NV Circuit d'interface de capteur à base d'oscillateur à boucle fermée
GB2584420A (en) * 2019-05-24 2020-12-09 Univ Of Westminster Method, sensor and system for determining a dielectric property of a sample
CN113567756B (zh) * 2021-09-24 2021-12-07 深圳飞骧科技股份有限公司 一种基于差分振荡器的介电常数测量装置

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE205757C (fr) *
DE870135C (de) * 1951-03-11 1953-03-09 Draegerwerk Ag Anordnung zur Messung der Dielektrizitaetskonstante
US3636470A (en) * 1967-12-04 1972-01-18 Olivetti & Co Spa Variable inductance-controlled oscillator switching circuit
US4053849A (en) * 1976-10-01 1977-10-11 Systron Donner Corporation Oscillation means for generating a differential AC signal proportional to movement of a conducting member
SU938118A1 (ru) * 1977-12-05 1982-06-23 Предприятие П/Я В-8895 Устройство дл измерени диэлектрической проницаемости провод щих материалов
US4426616A (en) * 1981-10-06 1984-01-17 Simmonds Precision Products, Inc. Capacitive measurement system
US4517547A (en) * 1981-11-20 1985-05-14 Motorola, Inc. Water-in-fuel sensor circuit and method
JPS61233373A (ja) * 1985-04-08 1986-10-17 Nippon Kagaku Kikai Seizo Kk 静電容量の測定方法
GB8709465D0 (en) * 1987-04-22 1987-05-28 Watkiss Automation Ltd Sensor
US5034722A (en) * 1990-01-16 1991-07-23 Joshua Premack Capacitance detection system
US5198777A (en) * 1990-02-14 1993-03-30 Murata Mfg. Co., Ltd. Paper thickness detecting apparatus having a resonator with a resonance point set by a capacitance detecting unit
DE59008731D1 (de) * 1990-08-30 1995-04-20 Siemens Ag Vorrichtung zum Feststellen des Alkoholgehaltes oder des Heizwertes eines Gemischs.
DE69129859D1 (de) * 1990-10-12 1998-08-27 Watson Feuchtigkeits- und salzgehaltssensor und verfahren zum gebrauch
US5119671A (en) * 1991-03-12 1992-06-09 Chrysler Corporation Method for flexible fuel control
US5291534A (en) * 1991-06-22 1994-03-01 Toyoda Koki Kabushiki Kaisha Capacitive sensing device
US5261270A (en) * 1991-08-15 1993-11-16 General Motors Corporation Fuel composition sensor diagnostic apparatus

Also Published As

Publication number Publication date
DE69323121T2 (de) 1999-09-16
EP0576243B1 (fr) 1999-01-20
EP0576243A2 (fr) 1993-12-29
ES2130225T3 (es) 1999-07-01
DE69323121D1 (de) 1999-03-04
EP0576243A3 (en) 1994-08-24
US5483172A (en) 1996-01-09

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