JPS55101851A - Humidity measuring circuit - Google Patents

Humidity measuring circuit

Info

Publication number
JPS55101851A
JPS55101851A JP951779A JP951779A JPS55101851A JP S55101851 A JPS55101851 A JP S55101851A JP 951779 A JP951779 A JP 951779A JP 951779 A JP951779 A JP 951779A JP S55101851 A JPS55101851 A JP S55101851A
Authority
JP
Japan
Prior art keywords
humidity
low
voltage
relative humidity
pulse duration
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
JP951779A
Other languages
Japanese (ja)
Other versions
JPS638422B2 (en
Inventor
Kunio Yamakawa
Yukihiko Ise
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP951779A priority Critical patent/JPS55101851A/en
Publication of JPS55101851A publication Critical patent/JPS55101851A/en
Publication of JPS638422B2 publication Critical patent/JPS638422B2/ja
Granted legal-status Critical Current

Links

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  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Abstract

PURPOSE: To increase the entire measuring range of a humidity measuring circuit by applying a pulse voltage to a humidity sensor to obtain a DC voltage corresponding to relative humidity and changing the pulse duration in response to the relative humidity.
CONSTITUTION: When relative humidity alters from low to high degrees, the voltage of an output terminal 3 varies in response to the altered humidity, and the oscillating frequency of a voltage controlled oscillator 5 also varies. As a result, the pulse duration of a pulse generator 4 becomes low to prevent deterioration of a humidity sensor 2 due to its electrolysis. When the relative humidity, on the other hand, alters from high to low degrees, the pulse duration becomes high to prevent the decrease of its accuracy. Since the measuring accuracy of the humidity can be thus raised at low humidity and the deterioration of the humidity sensor is prevented in high humidity range simultaneously, the entire measuring range of the humidity can be increased.
COPYRIGHT: (C)1980,JPO&Japio
JP951779A 1979-01-29 1979-01-29 Humidity measuring circuit Granted JPS55101851A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP951779A JPS55101851A (en) 1979-01-29 1979-01-29 Humidity measuring circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP951779A JPS55101851A (en) 1979-01-29 1979-01-29 Humidity measuring circuit

Publications (2)

Publication Number Publication Date
JPS55101851A true JPS55101851A (en) 1980-08-04
JPS638422B2 JPS638422B2 (en) 1988-02-23

Family

ID=11722443

Family Applications (1)

Application Number Title Priority Date Filing Date
JP951779A Granted JPS55101851A (en) 1979-01-29 1979-01-29 Humidity measuring circuit

Country Status (1)

Country Link
JP (1) JPS55101851A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63171878U (en) * 1987-04-28 1988-11-08

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS492596A (en) * 1972-04-19 1974-01-10
JPS5410787A (en) * 1977-06-27 1979-01-26 Yamatake Honeywell Co Ltd Hygrometer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS492596A (en) * 1972-04-19 1974-01-10
JPS5410787A (en) * 1977-06-27 1979-01-26 Yamatake Honeywell Co Ltd Hygrometer

Also Published As

Publication number Publication date
JPS638422B2 (en) 1988-02-23

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