JPS641947A - Water drop detector - Google Patents

Water drop detector

Info

Publication number
JPS641947A
JPS641947A JP15649987A JP15649987A JPS641947A JP S641947 A JPS641947 A JP S641947A JP 15649987 A JP15649987 A JP 15649987A JP 15649987 A JP15649987 A JP 15649987A JP S641947 A JPS641947 A JP S641947A
Authority
JP
Japan
Prior art keywords
water drops
adhesion
section
sensor section
remaining adhering
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
JP15649987A
Other languages
Japanese (ja)
Other versions
JPH011947A (en
Inventor
Tetsuo Hirano
Kouichi Yamanoue
Hiroaki Nishimura
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.)
Denso Corp
Soken Inc
Original Assignee
Nippon Soken Inc
NipponDenso 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 Nippon Soken Inc, NipponDenso Co Ltd filed Critical Nippon Soken Inc
Priority to JP15649987A priority Critical patent/JPS641947A/en
Publication of JPH011947A publication Critical patent/JPH011947A/en
Publication of JPS641947A publication Critical patent/JPS641947A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To detect adhesion of water drops accurately, by jointly using a heating means for a pair of detection electrodes provided for detection of the adhesion of water drops to evaporate away water drops remaining adhering to a sensor section.
CONSTITUTION: When water drops such as rain drops adhere to a sensor section 1, an electrostatic capacitance between a pair of detection electrodes changes and an oscillation frequency of a frequency oscillating section 2 varies. At a detector section 3, changes in the oscillation frequency are detected to judge the degree of adhesion of water drops. A control signal Sct is generated from the detecting section 3 according to the results of judgement. From the degree of adhesion of water drops, a heating control section 4 judges whether water drops remaining adhering to the sensor section 1 are above a specified value or not to heat a heating part 6 by a heating power source 5. The sensor section 1 is heated to remove water drops remaining adhering thereto. This enables detection of adhesion of water drops accurately without water drops remaining adhering to the sensor section 1.
COPYRIGHT: (C)1989,JPO&Japio
JP15649987A 1987-06-25 1987-06-25 Water drop detector Pending JPS641947A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15649987A JPS641947A (en) 1987-06-25 1987-06-25 Water drop detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15649987A JPS641947A (en) 1987-06-25 1987-06-25 Water drop detector

Publications (2)

Publication Number Publication Date
JPH011947A JPH011947A (en) 1989-01-06
JPS641947A true JPS641947A (en) 1989-01-06

Family

ID=15629095

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15649987A Pending JPS641947A (en) 1987-06-25 1987-06-25 Water drop detector

Country Status (1)

Country Link
JP (1) JPS641947A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH048956U (en) * 1990-05-11 1992-01-27
DE10162055B4 (en) * 2001-12-17 2007-04-12 Institut für Automation und Kommunikation eV Magdeburg Device for determining the volume, the surface tension and the viscosity of liquid drops
KR20230100233A (en) * 2021-12-28 2023-07-05 김상한 Window frost prevention system for vehicle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH048956U (en) * 1990-05-11 1992-01-27
DE10162055B4 (en) * 2001-12-17 2007-04-12 Institut für Automation und Kommunikation eV Magdeburg Device for determining the volume, the surface tension and the viscosity of liquid drops
KR20230100233A (en) * 2021-12-28 2023-07-05 김상한 Window frost prevention system for vehicle

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