Patent EP0259027A2 successfully refreshed from Google Patents.
EP0259027A2
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EP
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Temperature sensing system
Assignee: The General Electric Company PLC
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Filing: 1987-08-07
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Granted: —
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Expires: 2007-08-07
Abstract
Abstract A temperature sensing and measuring system in which a luminescent material (7,25) is excited using a light source (1). The luminescence emitted decays with time, the decay time being dependent on temperature. Thus, by monitoring the excitation and luminescence transmitted to and from the material (7,25) via an optical fibre (4,20), the decay time constant and thus the temperature can be determined.
Inventors
- 👤 Martin Paul Greaves
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 09:55
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/32; G01K11/3206; G01K11/3213
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
187 words
A temperature sensing and measuring system comprising at least one probe (5,29) containing a phosphor (7,25); means (1) for producing a pulse of radiation having a wavelength capable of exciting said phosphor (7,25) to luminescence; at least one optical fibre (4,20) capable of directing said radiation onto said phosphor (7,25) and capable of directing the luminescent emission from said phosphor (7,25) to a monitoring device (9) capable of deriving a first electrical signal which varies with the degree of luminescence, means (13) responsive to said pulse of radiation for deriving a second electrical signal having a value dependent on the intensity of the pulse and for storing said second signal; means (11) for integrating said first signal produced by said monitoring device (9) over a predetermined time period for producing a third electrical signal having a value representing said integrated first signal and means (14) for dividing said second signal by said third signal and for providing an output signal which is dependent on the result thereof characterised in that the luminescent decay time of said phosphor (7,25) is dependent on the temperature of said phosphor (7,25).
Claim 2
Dependent Claim
187 words
A temperature sensing and measuring system comprising at least one probe (5,29) containing a phosphor (7,25); means (1) for producing a pulse of radiation having a wavelength capable of exciting said phosphor (7,25) to luminescence; at least one optical fibre (4,20) capable of directing said radiation onto said phosphor (7,25) and capable of directing the luminescent emission from said phosphor (7,25) to a monitoring device (9) capable of deriving a first electrical signal which varies with the degree of luminescence, means (13) responsive to said pulse of radiation for deriving a second electrical signal having a value dependent on the intensity of the pulse and for storing said second signal; means (11) for integrating said first signal produced by said monitoring device (9) over a predetermined time period for producing a third electrical signal having a value representing said integrated first signal and means (14) for dividing said second signal by said third signal and for providing an output signal which is dependent on the result thereof characterised in that the luminescent decay time of said phosphor (7,25) is dependent on the temperature of said phosphor (7,25).
Claim 3
Dependent Claim
22 words
A temperature sensing and measuring system as claimed in Claim 1 wherein said phosphor (7,25) is aluminium oxide powder doped with chromium.
Claim 4
Dependent Claim
28 words
A temperature sensing and measuring system as claimed in Claims 1 or 2 wherein said means (1) for producing a pulse of radiation is a xenon flash lamp.
Claim 5
Dependent Claim
28 words
A temperature sensing and measuring system as claimed in Claims 1 or 2 wherein said means (1) for producing a pulse of radiation is a light emitting diode.
Claim 6
Dependent Claim
42 words
A temperature sensing and measuring system as claimed in any preceding claim wherein the same at least one optical fibre (4,20) is used to convey the pulse of radiation to the phosphor (7,25) and to carry the emission from the phosphor (7,25).
Claim 7
Dependent Claim
59 words
A temperature and measuring system as claimed in any preceding claim wherein said probe (5,29) consists of a tube (6,26) closed at one end and having an optical fibre (4,20) sealed into the opposite end, the phosphor (7,25) being located within the tube (6,26) between the end of the fibre (4,20) and the closed end of the tube (6,26).
Claim 8
Dependent Claim
19 words
A temperature sensing and measuring system as claimed in Claim 6 wherein said tube (6) is formed from metal.
Claim 9
Dependent Claim
19 words
A temperature sensing and measuring system as claimed in Claim 6 wherein said tube (26) is formed from glass.
Claim 10
Dependent Claim
19 words
A temperature sensing and measuring system as claimed in Claim 6 wherein said tube (26) is formed from plastics.
Claim 11
Dependent Claim
20 words
A temperature sensing and measuring system as claimed in Claim 6 wherein said tube (26) is formed from ceramic material.
Claim 12
Dependent Claim
29 words
A temperature sensing and measuring system as claimed in any preceding claim wherein a plurality of probes (5,29) with associated optical fibres (4,20) sense the temperature at different locations.
Claim 13
Dependent Claim
33 words
A temperature sensing and measuring system as claimed in Claim 11 wherein a common means (1) for producing a pulse of radiation is capable of exciting the phosphor (7,25) in each probe (5,29).
Claim 14
Dependent Claim
29 words
An electrical generator incorporating a temperature measuring system as claimed in any preceding claim provided with a plurality of said probes (5,29) disposed in different positions in the generator.
References Cited (Backward Citations)
No citation records indexed.
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