FR2295402A1 - Temp. resistance probe output linearising method - varies current flowing as function of non-linearity - Google Patents

Temp. resistance probe output linearising method - varies current flowing as function of non-linearity

Info

Publication number
FR2295402A1
FR2295402A1 FR7442108A FR7442108A FR2295402A1 FR 2295402 A1 FR2295402 A1 FR 2295402A1 FR 7442108 A FR7442108 A FR 7442108A FR 7442108 A FR7442108 A FR 7442108A FR 2295402 A1 FR2295402 A1 FR 2295402A1
Authority
FR
France
Prior art keywords
voltage
linearising
linearity
current flowing
function
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
FR7442108A
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Compagnie Francaise de Raffinage SA
Original Assignee
Compagnie Francaise de Raffinage SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Compagnie Francaise de Raffinage SA filed Critical Compagnie Francaise de Raffinage SA
Priority to FR7442108A priority Critical patent/FR2295402A1/en
Publication of FR2295402A1 publication Critical patent/FR2295402A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
    • G01K7/20—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit
    • G01K7/21—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit for modifying the output characteristic, e.g. linearising
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/02—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation
    • G01D3/021—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation using purely analogue techniques

Abstract

The output from a detector such as a thermoresistance is linearised by varying the current flowing through it as a function of the non-linearity. This permits use of the detector on various measuring equipments without scaling problems. A platinum resistance probe (1) is connected in series with a resistor (2) and a transistor (3). The voltage across the probe is measured by an operational amplifier (4) whose output is decreased by the voltage across the resistor at the inverting input of an operational amplifier (5). The output voltage (Vs) is proportional to probe temperature and part is fed back to another operational amplifier (6) with a reference voltage supplied by a potentiometer (7). The voltage across the resistor (2) is algebraically added to the reference voltage to control the transistor thus linearising the output voltage.
FR7442108A 1974-12-19 1974-12-19 Temp. resistance probe output linearising method - varies current flowing as function of non-linearity Withdrawn FR2295402A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7442108A FR2295402A1 (en) 1974-12-19 1974-12-19 Temp. resistance probe output linearising method - varies current flowing as function of non-linearity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7442108A FR2295402A1 (en) 1974-12-19 1974-12-19 Temp. resistance probe output linearising method - varies current flowing as function of non-linearity

Publications (1)

Publication Number Publication Date
FR2295402A1 true FR2295402A1 (en) 1976-07-16

Family

ID=9146416

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7442108A Withdrawn FR2295402A1 (en) 1974-12-19 1974-12-19 Temp. resistance probe output linearising method - varies current flowing as function of non-linearity

Country Status (1)

Country Link
FR (1) FR2295402A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0101956A2 (en) * 1982-08-27 1984-03-07 Endress u. Hauser GmbH u.Co. Resistance thermometer
FR2559974A1 (en) * 1984-02-21 1985-08-23 Mine Safety Appliances Co LINEARIZATION CIRCUIT WITH SINGLE BREAK POINT
EP0464391A1 (en) * 1990-06-25 1992-01-08 Weidmüller Interface GmbH & Co. Measuring device and method for putting it into operation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0101956A2 (en) * 1982-08-27 1984-03-07 Endress u. Hauser GmbH u.Co. Resistance thermometer
EP0101956A3 (en) * 1982-08-27 1985-09-18 Endress U. Hauser Gmbh U.Co. Resistance thermometer
FR2559974A1 (en) * 1984-02-21 1985-08-23 Mine Safety Appliances Co LINEARIZATION CIRCUIT WITH SINGLE BREAK POINT
EP0464391A1 (en) * 1990-06-25 1992-01-08 Weidmüller Interface GmbH & Co. Measuring device and method for putting it into operation

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