GB2319087A - Apparatus for measuring the water content with microwaves - Google Patents
Apparatus for measuring the water content with microwavesInfo
- 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- Withdrawn
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.
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)
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)
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 |
-
1997
- 1997-07-04 WO PCT/GB1997/001820 patent/WO1998001747A1/en active Application Filing
- 1997-07-04 AU AU34515/97A patent/AU3451597A/en not_active Abandoned
- 1997-07-04 GB GB9802895A patent/GB2319087A/en not_active Withdrawn
Patent Citations (4)
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)
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 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
NZ211421A (en) | Fluctuating light sample scanning:emitted light frequency correlation for particle detection | |
GB2319087A (en) | Apparatus for measuring the water content with microwaves | |
DE3066810D1 (en) | Method and surveillance system for detecting the presence of an e.m. wave receptor reradiator | |
JPS5567642A (en) | Microwave water meter having changeover measuring zone | |
WO2003031948A3 (en) | Method and apparatus for determining absorption of electromagnetic radiation by a material | |
DE60104985D1 (en) | microwave heating | |
WO2003007013A3 (en) | Radar apparatus and method for detecting small slow moving targets | |
MX9804829A (en) | Method and device for measuring electromagnetic waves emanating from a melt. | |
ATE258070T1 (en) | VIRUS DEPOSITION IN BIOTHERAPEUTIC PRODUCTS USING VARIABLE FREQUENCY MICROWAVES | |
US4204336A (en) | Microwave freeze drying method and apparatus | |
WO2000075196A8 (en) | Methods for monitoring sulfonyl halide functional group content of materials | |
ATE124138T1 (en) | METHOD FOR CLASSIFICATION OF PARTICLES. | |
Nguyen et al. | Combination of local heating and radiometry by microwaves | |
CA2005103A1 (en) | Co-variance microwave water cut monitoring means and method | |
WO2001073414A3 (en) | Membrane moisture measurement | |
NZ205997A (en) | Contacting gelatin,agar or carrageenan with a non-equilibrium plasma to improve water solubility | |
RU2058559C1 (en) | Method for contactless and remote high-voltage test of insulator strings on high-voltage overhead power transmission lines | |
JPS5590845A (en) | Dielectric constant surveilance device | |
RU96120976A (en) | METHOD OF MICROWAVE SPECTROSCOPY | |
RU2134410C1 (en) | Method and device for article airtightness test | |
SU813211A1 (en) | Dielectric flaw detector | |
RU96110813A (en) | METHOD FOR HEATING IN THE CAPACITY OF THICKEN PRODUCTS AND DEVICE FOR ITS IMPLEMENTATION | |
JPS6134448A (en) | Method and apparatus for measuring moisture content | |
JPH10125752A (en) | Apparatus for measuring lifetime of minority carrier | |
JPS57197455A (en) | Method and apparatus for continuous analysis of double modulation microwave |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |