EP0827096A2
Expired / Lapsed
EP
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Self-validating sensors
Assignee: Schneider Electric Systems USA Inc
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Filing: 1997-09-01
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Granted: —
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Expires: 2017-09-01
Abstract
Abstract A sensor (12) provides a measurement and information about the validity of the measurement. The sensor (12) includes a transducer (22) for generating a data signal related to the value of a variable and a transmitter (24) for receiving the data signal and generating output signals. The transmitter (24) generates a first output signal related to the value of the variable. The transmitter (24) also generates a second output signal based on a dynamic uncertainty analysis of the first output signal. <IMAGE>
Inventors
- 👤 Janice Chin-Yi Yang
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 13:03
CPC Classifications
G; G01; G01F; G01F15/00; G01F15/02; G01F15/022; G01F15/024; G01F1/00; G01F1/76; G01F1/78; G01F1/80; G01F1/84; G01F1/8409; G01F1/8436; G01F1/845; G01F1/8468; G01F1/8472; G01F1/8477
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
65 words
A method of compensating for variations in a
transfer function of a sensor, comprising: identifying a desired transfer function for the
sensor; determining an actual transfer function for the
sensor; receiving a measurement produced by the sensor; modifying the measurement based on the desired and
actual transfer functions to produce a modified
measurement; and providing the modified measurement as a measurement
value for the sensor.
Claim 2
Dependent Claim
18 words
The method of claim 1, wherein the desired
transfer function is identified from design criteria for
the sensor.
Claim 3
Dependent Claim
48 words
The method of claim 1 or 2, wherein the actual
transfer function varies with time, and wherein the step
of determining the actual transfer function comprises
determining the actual transfer function for a
particular time or period of time for which a
measurement value is to be produced.
Claim 4
Dependent Claim
29 words
The method of claim 1, 2 or 3, wherein the
sensor comprises a thermocouple, and wherein the step of
determining the actual transfer function comprises using
current injection tests.
Claim 5
Independent Claim
31 words
The method of any preceding claim, wherein the
step of modifying the measurement comprises modifying
the measurement based on an inverse of the actual
transfer function to produce a compensated measurement.
Claim 6
Dependent Claim
28 words
The method of claim 5, wherein the step of
modifying the measurement comprises modifying the
compensated measurement based on the desired transfer
function to produce the modified measurement.
Claim 7
Independent Claim
16 words
The method of any preceding claim, further
comprising generating an uncertainty measure for the
measurement value.
Claim 8
Dependent Claim
54 words
The method of claim 5 or 6, and 7, wherein the
step of generating an uncertainty measure comprises
generating a first uncertainty measure for the
compensated measurement, generating a second uncertainty
measure for the desired transfer function, and combining
the first and second uncertainty measures to produce the
uncertainty measure for the measurement value.
Claim 9
Dependent Claim
62 words
The method of claim 8, wherein the step of
generating the first uncertainty measure for the
compensated measurement comprises: generating a third uncertainty measure for the
measurement produced by the sensor; generating a fourth uncertainty measure for the
inverse of the actual transfer function; and combining the third and fourth uncertainty measures
to produce the first uncertainty measure for the
compensated measurement.
Claim 10
Independent Claim
116 words
A method of compensating for variations in a
transfer function of a sensor, comprising: identifying a desired transfer function for the
sensor; determining an actual transfer function for the
sensor; receiving a measurement produced by the sensor; modifying the measurement based on an inverse of
the actual transfer function to produce a compensated
measurement; modifying the compensated measurement based on the
desired transfer function to produce a modified
measurement; providing the modified measurement as a measurement
value for the sensor; generating a first uncertainty measure for the
compensated measurement; generating a second uncertainty measure for the
desired transfer function; and combining the first and second uncertainty measures
to produce an uncertainty measure for the measurement
value.
Claim 11
Dependent Claim
73 words
A sensor for providing a measurement value,
the sensor comprising: a transducer configured to generate a measurement;
and a transmitter configured to: identify a desired transfer function for the
transducer; determine an actual transfer function for the
transducer; receive the measurement generated by the
transducer; modify the measurement based on the desired and
actual transfer functions to produce a modified
measurement; and provide the modified measurement as a measurement
value for the sensor.
Claim 12
Dependent Claim
19 words
The sensor of claim 11, wherein the
transmitter identifies the desired transfer function
from design criteria for the sensor.
Claim 13
Dependent Claim
41 words
The sensor of claim 11 or 12, wherein the
actual transfer function varies with time, and wherein
the transmitter determines the actual transfer function
for a particular time or period of time for which the
measurement value is to be produced.
Claim 14
Dependent Claim
27 words
The sensor of claim 11, 12 or 13, wherein the
transducer comprises a thermocouple, and wherein the
transmitter determines the actual transfer function
using current injection tests.
Claim 15
Dependent Claim
29 words
The sensor of claim 11, 12, 13 or 14,, wherein
the transmitter modifies the measurement based on an
inverse of the actual transfer function to produce a
compensated measurement.
Claim 16
Dependent Claim
26 words
The sensor of any of claims 11 to 15, wherein
the transmitter modifies the measurement based on the
desired transfer function to produce the modified
measurement.
Claim 17
Dependent Claim
24 words
The sensor of any of claims 11 to 16, wherein
the transmitter is further operable to generate an
uncertainty measure for the measurement value.
Claim 18
Dependent Claim
40 words
The sensor of claim 15, wherein the
transmitter generates a first uncertainty measure for
the compensated measurement, generates a second
uncertainty measure for the desired transfer function,
and combines the first and second uncertainty measures
to produce the measurement value.
Claim 19
Dependent Claim
54 words
The sensor of claim 15 and 18, wherein the
transmitter generates the first uncertainty measure
generating a third uncertainty measure for the
measurement, generating a fourth uncertainty measure for
the inverse of the actual transfer function, and
combining the third and fourth uncertainty measures to
produce the first uncertainty measure for the
compensated measurement.
References Cited (Backward Citations)
No citation records indexed.
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