JPS5559335A - Humidity detector - Google Patents

Humidity detector

Info

Publication number
JPS5559335A
JPS5559335A JP13276978A JP13276978A JPS5559335A JP S5559335 A JPS5559335 A JP S5559335A JP 13276978 A JP13276978 A JP 13276978A JP 13276978 A JP13276978 A JP 13276978A JP S5559335 A JPS5559335 A JP S5559335A
Authority
JP
Japan
Prior art keywords
humidity
capacitor
circuit
output
detection
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.)
Pending
Application number
JP13276978A
Other languages
Japanese (ja)
Inventor
Osamu Kawasaki
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 JP13276978A priority Critical patent/JPS5559335A/en
Publication of JPS5559335A publication Critical patent/JPS5559335A/en
Pending legal-status Critical Current

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

Abstract

PURPOSE: To secure the detection for the condition of the humidity change as well as an accurate measurement by applying the AC signal to the humidity detector circuit and then differentiating the output of the detector circuit after detection for the comparison with the reference voltage.
CONSTITUTION: The output of oscillator circuit 1 is supplied to the base of transistor TrTR1, and the DC component of the output is deleted by capacitor C1. Thus the output is applied to the serial circuit of humidity detection element RH and resistance R2. Divided voltage V1 of element RH and resistance R2 features only the envelope curve waveform via TrTR2 and capacitor C3, and only signal V1' of such frequency component that can pass through the BPF comprising the detection circuit of resistance R5 and capacitor C3 and the differentiating circuit consisting of capacitor C4 plus resistances R11 and R12 is delivered. Voltage V1' is supplied to reverse input 2" and nonreverse input 3' of voltage comparators 2 and 3 each to be compared with reference voltage V2 and V3 respectively. Accordingly, comparator 2 operates only when the changing factor of the humidity is positive; while comparator 3 operates only the changing factor is negative respectively. Thus the rise and the fall of the humidity can be detected.
COPYRIGHT: (C)1980,JPO&Japio
JP13276978A 1978-10-27 1978-10-27 Humidity detector Pending JPS5559335A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13276978A JPS5559335A (en) 1978-10-27 1978-10-27 Humidity detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13276978A JPS5559335A (en) 1978-10-27 1978-10-27 Humidity detector

Publications (1)

Publication Number Publication Date
JPS5559335A true JPS5559335A (en) 1980-05-02

Family

ID=15089118

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13276978A Pending JPS5559335A (en) 1978-10-27 1978-10-27 Humidity detector

Country Status (1)

Country Link
JP (1) JPS5559335A (en)

Cited By (1)

* 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

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3796950A (en) * 1973-06-18 1974-03-12 Radionics Inc Measurement apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3796950A (en) * 1973-06-18 1974-03-12 Radionics Inc Measurement apparatus

Cited By (1)

* 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

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