JPS54145178A - Humidity detecting circuit - Google Patents

Humidity detecting circuit

Info

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
Application number
JP5315278A
Other languages
Japanese (ja)
Other versions
JPS5840697B2 (en
Inventor
Katsuyuki Fujito
Yoshiaki Hasegawa
Takehiko Unokuchi
Atsushi Nishino
Akihiko Yoshida
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 JP5315278A priority Critical patent/JPS5840697B2/en
Priority to US06/035,331 priority patent/US4282480A/en
Priority to GB7915164A priority patent/GB2020434B/en
Publication of JPS54145178A publication Critical patent/JPS54145178A/en
Publication of JPS5840697B2 publication Critical patent/JPS5840697B2/en
Expired legal-status Critical Current

Links

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  • 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
JP5315278A 1978-05-02 1978-05-02 humidity detection circuit Expired JPS5840697B2 (en)

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)

Also Published As

Publication number Publication date
JPS5840697B2 (en) 1983-09-07

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