Title:
INTERFEROMETRIC MICROWAVE SENSOR
Document Type and Number:
WIPO Patent Application WO2001036951
Kind Code:
A3
Abstract:
A novel microwave sensor (10, 60, 70, 90, 200, 250, 280) provides low-cost, robust measurement of the electrical properties of fluid substances. The sensor is suitable for use in an industrial vessel or pipe and employs parallel electrical transmission paths (12, 14) that differ in electrical or physical length. The electrical length of each transmission path, which may be a two-way path caused by placing a reflective element in each path, is further determined by the electrical properties of the material under test. The frequency (f) of the signal being applied to the sensor is varied in a known manner such that the difference in the electrical lengths ( DELTA L) of the transmission paths (12, 14) is caused to correspond to an odd integral multiple of a half wavelength. When the frequency is so adjusted and the signals that have traversed the transmission paths are allowed to coherently interfere with one another, then a minimum resultant signal or null is obtained. The null frequency for which a minimum signal is obtained is a direct measurement of the real part of the electrical permittivity ( epsilon r) of the material under test and thus provides a measurement from which material composition can be inferred. The material under test may be stationary of flowing past the probe element without affecting the characteristic of the measurement. An important application of the measurement method is that of determining the quality of steam and a preferred embodiment of such a sensor is described. Other fluid substances can be sensed using the sensor by the present inventions.
Inventors:
JEAN BUFORD RANDALL
WHITEHEAD FREDERICK LYNN
DANIEWICZ JOHN LEE
WHITEHEAD FREDERICK LYNN
DANIEWICZ JOHN LEE
Application Number:
PCT/US2000/031851
Publication Date:
June 20, 2002
Filing Date:
November 20, 2000
Export Citation:
Assignee:
RHINO ANALYTICS LLC (US)
International Classes:
G01N22/00; G01N22/04; (IPC1-7): G01N22/00
Foreign References:
| US5103181A | 1992-04-07 | |||
| US3403335A | 1968-09-24 | |||
| GB976128A | 1964-11-25 | |||
| US5073755A | 1991-12-17 | |||
| US4996489A | 1991-02-26 | |||
| DE2712600A1 | 1977-09-29 | |||
| US4544880A | 1985-10-01 | |||
| GB1078111A | 1967-08-02 | |||
| US4902961A | 1990-02-20 | |||
| US3500182A | 1970-03-10 | |||
| US5334941A | 1994-08-02 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 009, no. 122 (P - 359) 28 May 1985 (1985-05-28)
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 04 31 May 1995 (1995-05-31)
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 04 31 May 1995 (1995-05-31)
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