FR2262801A1 - Hygrometric measuring device using impedance change - uses filters at detector probe in polluted atmosphere - Google Patents

Hygrometric measuring device using impedance change - uses filters at detector probe in polluted atmosphere

Info

Publication number
FR2262801A1
FR2262801A1 FR7406812A FR7406812A FR2262801A1 FR 2262801 A1 FR2262801 A1 FR 2262801A1 FR 7406812 A FR7406812 A FR 7406812A FR 7406812 A FR7406812 A FR 7406812A FR 2262801 A1 FR2262801 A1 FR 2262801A1
Authority
FR
France
Prior art keywords
probe
hygrometric
measuring device
detector probe
impedance change
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.)
Granted
Application number
FR7406812A
Other languages
French (fr)
Other versions
FR2262801B1 (en
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.)
JULES ETS RICHARD
Original Assignee
JULES ETS RICHARD
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 JULES ETS RICHARD filed Critical JULES ETS RICHARD
Priority to FR7406812A priority Critical patent/FR2262801A1/en
Publication of FR2262801A1 publication Critical patent/FR2262801A1/en
Application granted granted Critical
Publication of FR2262801B1 publication Critical patent/FR2262801B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
    • G01N27/121—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid for determining moisture content, e.g. humidity, of the fluid

Abstract

Capacitive effects from the use of alternating currents are eliminated and filtes are used to effect measurements in polluted atmospheres. A hygrometer probe comprises two nickel wires wound on a cylindrical former and surrounded by fibre glass powder. It has a large impedance variation for cange of humidity level. The output of a Wien bridge oscillator is connected to the probe through a bridge divider. The probe output passes through a low impedance convertor powered from a power supply to an amplifier with a synchronous detector for measurement on a galvanometer. The detector probe is connected to the electronic unit through a screened cable.
FR7406812A 1974-02-28 1974-02-28 Hygrometric measuring device using impedance change - uses filters at detector probe in polluted atmosphere Granted FR2262801A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7406812A FR2262801A1 (en) 1974-02-28 1974-02-28 Hygrometric measuring device using impedance change - uses filters at detector probe in polluted atmosphere

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7406812A FR2262801A1 (en) 1974-02-28 1974-02-28 Hygrometric measuring device using impedance change - uses filters at detector probe in polluted atmosphere

Publications (2)

Publication Number Publication Date
FR2262801A1 true FR2262801A1 (en) 1975-09-26
FR2262801B1 FR2262801B1 (en) 1976-06-25

Family

ID=9135579

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7406812A Granted FR2262801A1 (en) 1974-02-28 1974-02-28 Hygrometric measuring device using impedance change - uses filters at detector probe in polluted atmosphere

Country Status (1)

Country Link
FR (1) FR2262801A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2433744A1 (en) * 1978-08-16 1980-03-14 Alliance Tech Ind Detecting water in normally gas-filled enclosure by means of a probe - with electrodes, resistance between which depends on condition, connected to current generator and circuit detecting current variation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2433744A1 (en) * 1978-08-16 1980-03-14 Alliance Tech Ind Detecting water in normally gas-filled enclosure by means of a probe - with electrodes, resistance between which depends on condition, connected to current generator and circuit detecting current variation

Also Published As

Publication number Publication date
FR2262801B1 (en) 1976-06-25

Similar Documents

Publication Publication Date Title
JPH0221255A (en) Moisture content measuring apparatus
JPS5382377A (en) Probe used in measuring instruments
JPS5268477A (en) Measuring device for detecting digital measurement value of ac voltage frequency
ES8101271A1 (en) Apparatus for measuring a liquid level.
FR2287045A1 (en) CORONA CURRENT MEASURING AND CONTROL UNIT
CH469265A (en) Test tube used for displaying and measuring the carbon dioxide contained in the air
FR2262801A1 (en) Hygrometric measuring device using impedance change - uses filters at detector probe in polluted atmosphere
IT1042097B (en) PROCEDURE AND DEVICE FOR THE SELECTIVE MEASUREMENT OF THE OSCILLATION COMPONENTS OF AN OSCILLATION SPECTRUM IN PARTICULAR FOR MEASURE OF IMBALANCE AND DETECTOR OF THE MEASURED VALUE FOR THIS PURPOSE
GB1067459A (en) Improvements in dielectric gauges
ATE82801T1 (en) DEVICE FOR DETECTING GASEOUS HYDROCARBONS.
SU669279A1 (en) Moisture content meter
SU930162A1 (en) Device for measuring electric field strength
FR2229324A5 (en) Humidity detection and measurement - relies on measurement of resistivity to cause oscillations in loudspeaker
SU105092A1 (en) Measuring instrument of basic parameters of electronic lamps
SU905755A1 (en) Humidity meter
FR2316603A1 (en) Measurement of moisture content of cereal grain - is effected by capacity meter employed as humidity meter
SE7907397L (en) SET AND DEVICE FOR SEATING THE FILLING RATE OF AN ELECTRIC MOTOR MILL
SU138397A1 (en) Moisture meter
SU459743A1 (en) Complex dielectric permittivity meter
SU119613A1 (en) Method for contactless measurement of high potentials
SU669284A1 (en) Eddy-current flaw detector
ES340485A1 (en) Apparatus for the simultaneous measurement of the evolutive conductivity of a liquidat a plurality of definite points in a mass thereof
JPS5221872A (en) Device for measuring and inspecting parameters of electrical circuit element
JPS5540950A (en) Sharpness measuring unit
JPH059737B2 (en)

Legal Events

Date Code Title Description
ST Notification of lapse