JPS56157844A - Humidity detector - Google Patents

Humidity detector

Info

Publication number
JPS56157844A
JPS56157844A JP6189580A JP6189580A JPS56157844A JP S56157844 A JPS56157844 A JP S56157844A JP 6189580 A JP6189580 A JP 6189580A JP 6189580 A JP6189580 A JP 6189580A JP S56157844 A JPS56157844 A JP S56157844A
Authority
JP
Japan
Prior art keywords
pulse
humidity
differential signal
signal
sensitive element
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
JP6189580A
Other languages
Japanese (ja)
Other versions
JPS649581B2 (en
Inventor
Shigeki Tsuchiya
Nobuaki Miyagawa
Toru Sugawara
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6189580A priority Critical patent/JPS56157844A/en
Publication of JPS56157844A publication Critical patent/JPS56157844A/en
Publication of JPS649581B2 publication Critical patent/JPS649581B2/ja
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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

PURPOSE:To obtain a digital signal in proportion to a relative humidity, by a method wherein a differential signal, which differentiates a pulse from a pulse generator, is amplified in proportion to a resistance value of a humidity-sensitive element, and a time width pulse, which has higher than the given level of said signal, is measured. CONSTITUTION:A pulse signal, generated by means of a pulse generator 1, is differentiated by a condenser 2 and a resistor 3, and the differential signal is inputted to an inversion input terminal of an amplifier 6. A resistance system humidity-sensitive element 5, whose resistance value changes exponent-functionally, is connected to the amplifier 6 in the middle of a return ranging from an output side to the inversion input terminal. This adds a differential signal, having a waveform being symmetrical to a time axis, to the humidity-sensitive element 5, and exerts no polarization action. Additionally, a decay time T, which elapses during the decrease to the given level of the differential signal, changes in a straight line according to changes in a relative humidity. The decay time T opens a gate 9 for the duration of a time T, and a pulse E from a crystal oscillator 10 is measured by counting through the working of a counter circuit 11.
JP6189580A 1980-05-10 1980-05-10 Humidity detector Granted JPS56157844A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6189580A JPS56157844A (en) 1980-05-10 1980-05-10 Humidity detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6189580A JPS56157844A (en) 1980-05-10 1980-05-10 Humidity detector

Publications (2)

Publication Number Publication Date
JPS56157844A true JPS56157844A (en) 1981-12-05
JPS649581B2 JPS649581B2 (en) 1989-02-17

Family

ID=13184330

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6189580A Granted JPS56157844A (en) 1980-05-10 1980-05-10 Humidity detector

Country Status (1)

Country Link
JP (1) JPS56157844A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60203844A (en) * 1984-03-28 1985-10-15 Tdk Corp Humidity detector
JPS60203843A (en) * 1984-03-28 1985-10-15 Hochiki Corp Gas detecting apparatus
JPS6280545A (en) * 1985-10-04 1987-04-14 Nittan Co Ltd Environmental abnormality detecting circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5421789A (en) * 1977-07-19 1979-02-19 Matsushita Electric Ind Co Ltd Humidity display device
JPS5540938A (en) * 1978-09-15 1980-03-22 Matsushita Electric Works Ltd Moisture measuring circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5421789A (en) * 1977-07-19 1979-02-19 Matsushita Electric Ind Co Ltd Humidity display device
JPS5540938A (en) * 1978-09-15 1980-03-22 Matsushita Electric Works Ltd Moisture measuring circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60203844A (en) * 1984-03-28 1985-10-15 Tdk Corp Humidity detector
JPS60203843A (en) * 1984-03-28 1985-10-15 Hochiki Corp Gas detecting apparatus
JPH0374790B2 (en) * 1984-03-28 1991-11-28
JPS6280545A (en) * 1985-10-04 1987-04-14 Nittan Co Ltd Environmental abnormality detecting circuit

Also Published As

Publication number Publication date
JPS649581B2 (en) 1989-02-17

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