JPS55101851A - Humidity measuring circuit - Google Patents
Humidity measuring circuitInfo
- 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
Links
Landscapes
- 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 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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63171878U (en) * | 1987-04-28 | 1988-11-08 |
Citations (2)
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 |
-
1979
- 1979-01-29 JP JP951779A patent/JPS55101851A/en active Granted
Patent Citations (2)
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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