GB2319087A - Apparatus for measuring the water content with microwaves - Google Patents

Apparatus for measuring the water content with microwaves

Info

Publication number
GB2319087A
GB2319087A GB9802895A GB9802895A GB2319087A GB 2319087 A GB2319087 A GB 2319087A GB 9802895 A GB9802895 A GB 9802895A GB 9802895 A GB9802895 A GB 9802895A GB 2319087 A GB2319087 A GB 2319087A
Authority
GB
United Kingdom
Prior art keywords
ghz
range
frequency
khz
radiation
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB9802895A
Other versions
GB9802895D0 (en
Inventor
Nicholas Adrian Reed
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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
Priority claimed from GBGB9613998.5A external-priority patent/GB9613998D0/en
Priority claimed from GBGB9613999.3A external-priority patent/GB9613999D0/en
Application filed by Individual filed Critical Individual
Publication of GB9802895D0 publication Critical patent/GB9802895D0/en
Publication of GB2319087A publication Critical patent/GB2319087A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
    • G01N22/04—Investigating moisture content

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

A method of determining the quantity of unbound water in a substrate is (10) disclosed, comprising directing (14) a beam of incident microwave radiation (16) of a wavelength absorbable by the unbound water; measuring (18) the microwave radiation transmitted through the substrate, and determining the quantity of water present from the intensity difference between the incident radiation and the transmitted radiation. This detection method allows such processes as hydration reactions, dehydration reactions, freezing and drying to be monitored as to their progress. A suitable frequency of incident microwave energy used is 3 GHz or greater, preferably in the range of 3 to 30 GHz, more preferably in the range 9 to 13 GHz, yet still more preferably within the range 10 to 12 GHz. A particularly preferred range is between 10 and 11 GHz. The application also describes compensation for dissipation, absorption etc. by superimposing a low frequency reference signal. The received carrier wave strength can then be compared with the received reference wave strength in order to calculate the carrier wave loss through water absorption. A preferred frequency for the reference signal is not greater than 100 kHz, more preferably between 10 Hz and 10 kHz. A suitable frequency within this range is 1 kHz. A less preferred (but viable) frequency is 81 Hz. The invention also provides apparatus embodying the above methods.
GB9802895A 1996-07-04 1997-07-04 Apparatus for measuring the water content with microwaves Withdrawn GB2319087A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9613998.5A GB9613998D0 (en) 1996-07-04 1996-07-04 Improvements in or relating to instrumentation
GBGB9613999.3A GB9613999D0 (en) 1996-07-04 1996-07-04 Improvements in or relating to instrumentation
PCT/GB1997/001820 WO1998001747A1 (en) 1996-07-04 1997-07-04 Apparatus for measuring the water content with microwaves

Publications (2)

Publication Number Publication Date
GB9802895D0 GB9802895D0 (en) 1998-04-08
GB2319087A true GB2319087A (en) 1998-05-13

Family

ID=26309629

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9802895A Withdrawn GB2319087A (en) 1996-07-04 1997-07-04 Apparatus for measuring the water content with microwaves

Country Status (3)

Country Link
AU (1) AU3451597A (en)
GB (1) GB2319087A (en)
WO (1) WO1998001747A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002054830A2 (en) 2000-12-29 2002-07-11 Corning Incorporated Apparatus and method for processing ceramics
NZ522635A (en) * 2002-12-17 2005-11-25 Agres Ltd A method and apparatus for temperature measurement of frozen organic matter using electromagnetic radiation
NZ534673A (en) 2004-08-12 2006-03-31 Agres Ltd Non-invasive sensor and method of use for measuring the temperature and composition of frozen food products
GB0911143D0 (en) * 2009-06-26 2009-08-12 Sec Dep For Innovation Univers Hyrdation monitoring device and method
EP3101420A1 (en) * 2015-06-04 2016-12-07 M2Wave bvba Sensor for monitoring freezing status of products
CN107941645B (en) * 2017-12-15 2020-04-14 东南大学 Method for measuring reaction degree of each substance in fly ash, silica fume and cement three-phase composite system
EP3757555A1 (en) * 2019-06-28 2020-12-30 Aquantis SA Methods for calculating & predicting the degree-of-crystallization of a product

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0000020A1 (en) * 1977-06-02 1978-12-20 Bayer Ag Apparatus for measuring the water content of isotropic materials with the aid of microwave absorption
DD203398A1 (en) * 1981-12-23 1983-10-19 Martin Weber METHOD AND ARRANGEMENT FOR MEASURING THE WATER CONTENT OF RAW BROWN COAL
US4716360A (en) * 1985-08-16 1987-12-29 Advanced Moisture Technology, Inc. Moisture detector apparatus and method
US5014010A (en) * 1989-04-10 1991-05-07 Texaco Inc. Dual frequency microwave water cut monitoring means and method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0000020A1 (en) * 1977-06-02 1978-12-20 Bayer Ag Apparatus for measuring the water content of isotropic materials with the aid of microwave absorption
DD203398A1 (en) * 1981-12-23 1983-10-19 Martin Weber METHOD AND ARRANGEMENT FOR MEASURING THE WATER CONTENT OF RAW BROWN COAL
US4716360A (en) * 1985-08-16 1987-12-29 Advanced Moisture Technology, Inc. Moisture detector apparatus and method
US5014010A (en) * 1989-04-10 1991-05-07 Texaco Inc. Dual frequency microwave water cut monitoring means and method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
KRASZEWSKI A W: "MICROWAVE AQUAMETRY-NEEDS AND PERSPECTIVES"IEEE TR. MIC. TH. Vol.39(5) 1991 828-835 *
KUPFER K: "MIKROWELLENFEUCHTEMESSGERATE UND IHR EINSATZ..." TECHNISCHES MESSEN Vol.61(11)1994 409-20 *

Also Published As

Publication number Publication date
GB9802895D0 (en) 1998-04-08
AU3451597A (en) 1998-02-02
WO1998001747A1 (en) 1998-01-15

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)