Patent EP0078592A2 successfully refreshed from Google Patents.
EP0078592A2
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EP
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Method of and apparatus for automatically compensating for variations in output response characteristics of sensors and the like
Assignee: Panametrics LLC
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Filing: 1982-05-17
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Granted: —
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Expires: 2002-05-17
Abstract
Abstract This disclosure is concerned with a novel technique for automatically fitting the output response characteristic curve of a measurement sensor to that of an ideal or reference sensor through determination of output variations in response to the same input stimulus near one end or point of the curve, storing the differences for automatic correction of the measurement sensor output by effectively superimposing the curves at such end, determination of output variations at another end or point of the curve, and effectively relatively pivoting the measurement sensor output curve about the said one end to cause substantial superposition of the other end or point of the curve and the span therebetween, thereby to provide stored signals for automatically correcting the output response of the measurement sensor, when in subsequent measurement use, over the complete characteristic response curve between its ends or selected points.
Inventors
- 👤 David Townzen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:58
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/02; G01K7/021; G01D; G01D3/00; G01D3/02; G01D3/022
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
196 words
A method of compensating for variations in the output signal response characteristic curve of a measurement sensor to input stimuli from the output signal response of an ideal reference sensor, over an input stimuli range including two different-valued input stimuli, the method comprising, determining and storing signal variation in the output of the measurement and reference sensors in response to one-value input stimulus; applying the stored signal variation to to the measurement sensor output, during measurement use, effectively to superimpose the measurement and reference output response characteristic curves at a first point corresponding to said one-value input stimulus; determining and storing signal variation in the output of the measurement and reference sensors in response to a different-value input stimulus; applying the last-named stored signal variation to the measurement sensor output, during measurement use, effectively relatively to pivot said characteristic curves about said first point substantially to superpose the said characteristic curves at a second point corresponding to said different-value input stimulus and over the span therebetween, thereby automatically to correct the output response of the measurement sensor, in subsequent measure-- ment use, over a region of the characteristic response curve including said first and second points.
Claim 2
Independent Claim
196 words
A method of compensating for variations in the output signal response characteristic curve of a measurement sensor to input stimuli from the output signal response of an ideal reference sensor, over an input stimuli range including two different-valued input stimuli, the method comprising, determining and storing signal variation in the output of the measurement and reference sensors in response to one-value input stimulus; applying the stored signal variation to to the measurement sensor output, during measurement use, effectively to superimpose the measurement and reference output response characteristic curves at a first point corresponding to said one-value input stimulus; determining and storing signal variation in the output of the measurement and reference sensors in response to a different-value input stimulus; applying the last-named stored signal variation to the measurement sensor output, during measurement use, effectively relatively to pivot said characteristic curves about said first point substantially to superpose the said characteristic curves at a second point corresponding to said different-value input stimulus and over the span therebetween, thereby automatically to correct the output response of the measurement sensor, in subsequent measure-- ment use, over a region of the characteristic response curve including said first and second points.
Claim 3
Dependent Claim
25 words
A method as claimed in claim 1 and in which the sensor output signal responses are initially substantially linearized before said determining and storing steps.
Claim 4
Dependent Claim
20 words
A method as claimed in claim 1 and in which said determining step includes time-averaging the measurement sensor output signals.
Claim 5
Independent Claim
258 words
A method of compensating for variations in the output response characteristic curve of a measurement sensor to input stimuli from the output response of an ideal reference sensor over an input stimuli range including low and high-valued input stimuli, the method comprising, applying the low-value input stimulus to the measurement sensor to produce a corresponding low-value output response at a low portion of the said curve; comparing such output response with the reference sensor output response to such low-value input stimulus; storing the difference between the compared low-value output responses and applying the same for automatically correcting the output response of the measurement sensor, when in subsequent use, by such difference over the characteristic output response thereof, effectively substantially superimposing said low portion of the output response characteristic curve of the measurement sensor upon the low portion of the output response characteristic curve of said reference sensor; applying the high-value input stimulus to the measurement sensor to produce a corresponding high-value output response; comparing the last-named output response with the reference sensor output response to such high-value input stimulus; storing the difference between said high-value output responses and applying the same effectively to pivot the characteristic curve response of the measurement sensor about the superimposed low portion thereof into high portion and thus intermediate span substantial superposition of the characteristic response curves of the measurement sensor and the reference sensor, thereby auto-, matically correcting the output response of the measurement sensor, when in subsequent use, over the complete characteristic response curve including said low and high portions thereof.
Claim 6
Independent Claim
258 words
A method of compensating for variations in the output response characteristic curve of a measurement sensor to input stimuli from the output response of an ideal reference sensor over an input stimuli range including low and high-valued input stimuli, the method comprising, applying the low-value input stimulus to the measurement sensor to produce a corresponding low-value output response at a low portion of the said curve; comparing such output response with the reference sensor output response to such low-value input stimulus; storing the difference between the compared low-value output responses and applying the same for automatically correcting the output response of the measurement sensor, when in subsequent use, by such difference over the characteristic output response thereof, effectively substantially superimposing said low portion of the output response characteristic curve of the measurement sensor upon the low portion of the output response characteristic curve of said reference sensor; applying the high-value input stimulus to the measurement sensor to produce a corresponding high-value output response; comparing the last-named output response with the reference sensor output response to such high-value input stimulus; storing the difference between said high-value output responses and applying the same effectively to pivot the characteristic curve response of the measurement sensor about the superimposed low portion thereof into high portion and thus intermediate span substantial superposition of the characteristic response curves of the measurement sensor and the reference sensor, thereby auto-, matically correcting the output response of the measurement sensor, when in subsequent use, over the complete characteristic response curve including said low and high portions thereof.
Claim 7
Dependent Claim
21 words
A method as claimed in claim 4 and in which the characteristic output responses of said sensors are intially substantially linearized.
Claim 8
Dependent Claim
38 words
A method as claimed in claim 4 and in which the output responses of said measurement sensor are time averaged, and the time-averaged values thereof are used for obtaining said difference values from the reference sensor output responses.
Claim 9
Dependent Claim
51 words
A method as claimed in claim 4 and in which said sensor is a temperature-responsive -sensor, said output response characteristic curve represents output signal versus input temperature stimulus, and said low and high end stimulus values are substantially freezing and boiling points of water or the like at standard atmospheric pressure.
Claim 10
Dependent Claim
279 words
Apparatus for automatically compensating for variations in the output response characteristic curves of a measurement sensor and an ideal reference sensor over an input stimulus range including a pair of relatively low-and high-valued input stimuli, said apparatus having, in combination, means for measuring the output response of the measurement sensor in response to the application thereto of one of the input stimuli; means responsive to said measuring means for comparing such measured output response with that of said reference sensor for said one input stimulus; means connected with the comparing means for storing the difference between the compared output responses and for applying said difference to the output of said measurement sensor, when in subsequent measurement use, automatically effectively to superimpose the corresponding portion of said measurement and standard sensor output response characteristic curves; means for measuring the output response of the measurement sensor in response to the application thereto of the other of the said pair of input stimuli; means responsive to said last-named measuring means for comparing such measured output response with that of said reference sensor for said other input stimulus; means connected with said last-named comparing means for storing the difference between the output responses for said other input stimulus and for applying such difference to the ouput of said measurement sensor, when in subsequent measurement use, automatically effectively relatively to pivot the characteristic curve responses about the superimposed portion thereof into other portion and thus intermediate span substantial superposition of the measurement and standard sensor characteristic response curves, thereby automatically correcting the output response of the measurement sensor, when in subsequent measurement use, over the complete characteristic response curve including said low-and high-valued inputs.
Claim 11
Dependent Claim
279 words
Apparatus for automatically compensating for variations in the output response characteristic curves of a measurement sensor and an ideal reference sensor over an input stimulus range including a pair of relatively low-and high-valued input stimuli, said apparatus having, in combination, means for measuring the output response of the measurement sensor in response to the application thereto of one of the input stimuli; means responsive to said measuring means for comparing such measured output response with that of said reference sensor for said one input stimulus; means connected with the comparing means for storing the difference between the compared output responses and for applying said difference to the output of said measurement sensor, when in subsequent measurement use, automatically effectively to superimpose the corresponding portion of said measurement and standard sensor output response characteristic curves; means for measuring the output response of the measurement sensor in response to the application thereto of the other of the said pair of input stimuli; means responsive to said last-named measuring means for comparing such measured output response with that of said reference sensor for said other input stimulus; means connected with said last-named comparing means for storing the difference between the output responses for said other input stimulus and for applying such difference to the ouput of said measurement sensor, when in subsequent measurement use, automatically effectively relatively to pivot the characteristic curve responses about the superimposed portion thereof into other portion and thus intermediate span substantial superposition of the measurement and standard sensor characteristic response curves, thereby automatically correcting the output response of the measurement sensor, when in subsequent measurement use, over the complete characteristic response curve including said low-and high-valued inputs.
Claim 12
Dependent Claim
22 words
Apparatus as claimed in claim 8 and in which means is provided for initially substantially linearizing the output responses of said sensors.
Claim 13
Dependent Claim
36 words
Apparatus as claimed in claim 8 and in which time-averaging means is provided responsive to the out- 'put of said measurement sensor, connected to apply time-averaged output responses of the measurement sensor to said comparing means.
Claim 14
Dependent Claim
30 words
Apparatus as claimed in claim 8 and in which sensors are temperature-responsive sensors and said output response characteristic curve represents electrical output signals as a function of input temperature stimuli.
Claim 15
Dependent Claim
36 words
Apparatus as claimed in claim 11 and in which said sensors are of the thermocouple type and the low and high end input values are substantially freezing and boiling points of water at standard atmospheric pressure.
Claim 16
Dependent Claim
82 words
Apparatus as claimed in claim 8 and in which substantially the following relationship is established between the input stimulus Y and the output response X as measured by the said measurement sensor: Where Xl and X2 are the output responses of an ideal reference sensor to stimuli Yl and Y2, respectively, and Δ X1 and Δ X2 are differences from Xl and (X2 + Δ Xl) in the output responses for respective stimuli Yl and Y2 produced by the said measurement sensor.
References Cited (Backward Citations)
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