JPS54145178A - Humidity detecting circuit - Google Patents
Humidity detecting circuitInfo
- Publication number
- JPS54145178A JPS54145178A JP5315278A JP5315278A JPS54145178A JP S54145178 A JPS54145178 A JP S54145178A JP 5315278 A JP5315278 A JP 5315278A JP 5315278 A JP5315278 A JP 5315278A JP S54145178 A JPS54145178 A JP S54145178A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- humidity
- detecting element
- humidity detecting
- 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 Electric Means (AREA)
Abstract
PURPOSE: To increase accuracy and detect relative humidity accurately even when temperature fluctuates with a simple circuit constitution by making use of the characteristics of a humidity detecting element whose electrostatic capacity changes with humidity.
CONSTITUTION: A first pulse generating circuit 1 causes a humidity detecting element 2 to be charged and discharged by a charging-discharging circuit 3 and the voltage across the humidity detecting element 2 becomes one input to a voltage comparator 5. The output of a voltage generting circuit 4 becomes another input to the voltage comparator 5 as a slice level voltage. A second pulse generating circuit 6 causes a capacitor 7 to be charged and discharged by a charging-discharging circuit 8, but the slice level voltage of the voltage generating circuit 9 changes with temperature and therefore the output of the voltage comparator 10 changes in pulse width with temperature. Next, the difference between the output pulses of the pulse generating circuits 1, 6 is outputted by an arithmetic circuit 11. If the pulse width proportional to relative humidity is obtained in this way,the humidity may be digitally displayed.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5315278A JPS5840697B2 (en) | 1978-05-02 | 1978-05-02 | humidity detection circuit |
| US06/035,331 US4282480A (en) | 1978-05-02 | 1979-05-01 | Apparatus for humidity detection |
| GB7915164A GB2020434B (en) | 1978-05-02 | 1979-05-01 | Apparatus for humidity detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5315278A JPS5840697B2 (en) | 1978-05-02 | 1978-05-02 | humidity detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54145178A true JPS54145178A (en) | 1979-11-13 |
| JPS5840697B2 JPS5840697B2 (en) | 1983-09-07 |
Family
ID=12934855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5315278A Expired JPS5840697B2 (en) | 1978-05-02 | 1978-05-02 | humidity detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5840697B2 (en) |
-
1978
- 1978-05-02 JP JP5315278A patent/JPS5840697B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5840697B2 (en) | 1983-09-07 |
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