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EP0465029A2
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EP
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Distributed temperature sensor
Assignee: Mobrey Group Ltd
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Filing: 1991-06-13
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Granted: —
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Expires: 2011-06-13
Abstract
Abstract A distributed temperature sensor comprises an elongate ultrasonic waveguide having a number of zones along its length, each zone having a grating formed in it. This is typically achieved by incorporating uniformly spaced notches or bands (or collars) throughout the zone. The grating spacing in each zone is different, so that each grating reflects a characteristic frequency. This frequency varies as the temperature of the zone varies, so if wide-band ultrasonic pulses are launched into the waveguide, the temperature of each zone can be determined from the reflected frequencies.
Inventors
- 👤 Paul Anthony Hanscombe
- 👤 Paul Nigel Richards
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 11:00
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/22; G01K11/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
A distributed temperature sensor comprising an elongate ultrasonic waveguide, said waveguide having at least one zone formed as a grating to reflect the ultrasonic waves at a frequency determined by the grating dimensions and temperature, means for supplying a wide range of ultrasonic frequencies to the waveguide and means for detecting and analysing the frequencies reflected by the grating to provide a measure of the temperature of the zone.
Claim 2
Dependent Claim
26 words
A temperature sensor as claimed in claim 1 in which the or each zone is formed as a regular grating with a mark/space ratio of one.
Claim 3
Dependent Claim
22 words
A temperature sensor as claimed in claim 2 in which each of a number of zones has a different grating repeat length.
Claim 4
Dependent Claim
30 words
A temperature sensor as claimed in claim 1 in which a length of the waveguide is formed as a reflecting grating with a continuously varying spacing between the reflector elements.
Claim 5
Dependent Claim
31 words
A temperature sensor as claimed in any of claims 1 to 4 in which the or each grating is formed by providing notches at intervals along the length of the waveguide.
Claim 6
Dependent Claim
30 words
A temperature sensor as claimed in claim 5 in which the waveguide is of circular cross-section and the notches are formed by machining flats at intervals along the waveguide surface.
Claim 7
Dependent Claim
32 words
A temperature sensor as claimed in any of the preceding claims in which the means for supplying ultrasonic energy to the waveguide comprises an electrical pulse generator coupled to a magneto-strictive element.
References Cited (Backward Citations)
No citation records indexed.
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