JPS57110941A - Detector for frosting - Google Patents

Detector for frosting

Info

Publication number
JPS57110941A
JPS57110941A JP18546880A JP18546880A JPS57110941A JP S57110941 A JPS57110941 A JP S57110941A JP 18546880 A JP18546880 A JP 18546880A JP 18546880 A JP18546880 A JP 18546880A JP S57110941 A JPS57110941 A JP S57110941A
Authority
JP
Japan
Prior art keywords
light
frost
detecting rod
receiving element
reference voltage
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
JP18546880A
Other languages
Japanese (ja)
Inventor
Manabu Fujii
Masahiro Inoue
Mitsunobu Ezaki
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP18546880A priority Critical patent/JPS57110941A/en
Publication of JPS57110941A publication Critical patent/JPS57110941A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
    • G01N21/43—Refractivity; Phase-affecting properties, e.g. optical path length by measuring critical angle
    • G01N21/431—Dip refractometers, e.g. using optical fibres

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

PURPOSE:To make it possible to detect build-up of frost on the chiller of a refrigerator directly and in a linear configuration, by comparing a detected output of a light having passed a detecting rod which is made of light-pervious material, and a reference voltage. CONSTITUTION:An incident light P1 from a luminous element 1, while reflecting on interface of a detecting rod 3 which is made of light-pervious materials such as plastic and glass, etc., proceeds in the detecting rod 3 and enters a light- receiving element 2. As the frost building up around the detecting rod 3 grows, a leakage of light DELTAP increases, and therefore, an amount of light emission P2 to the light-receiving element 2 decreases. An output of the light-receiving element 2 is compared by a comparator 5 with a reference voltage which was set by a reference voltage setting circuit 7 through a current-voltage converter 4, and when this differential voltage e0 became a value corresponding to a prescribed volume of frost build-up, an output circuit 6 operates to start alarming or defrosting. It is possible, by so doing, to ensure detection of frost build-up.
JP18546880A 1980-12-27 1980-12-27 Detector for frosting Pending JPS57110941A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18546880A JPS57110941A (en) 1980-12-27 1980-12-27 Detector for frosting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18546880A JPS57110941A (en) 1980-12-27 1980-12-27 Detector for frosting

Publications (1)

Publication Number Publication Date
JPS57110941A true JPS57110941A (en) 1982-07-10

Family

ID=16171297

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18546880A Pending JPS57110941A (en) 1980-12-27 1980-12-27 Detector for frosting

Country Status (1)

Country Link
JP (1) JPS57110941A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0115025A2 (en) * 1982-12-23 1984-08-08 Wolfgang Dr. Ruhrmann Optical sensor
JPS60174931A (en) * 1984-02-22 1985-09-09 Niles Parts Co Ltd Raindrop detector
JPH03504536A (en) * 1988-03-04 1991-10-03 ファイバーケム、インコーポレーテッド Optical sensors to detect icing and other chemical species

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0115025A2 (en) * 1982-12-23 1984-08-08 Wolfgang Dr. Ruhrmann Optical sensor
JPS60174931A (en) * 1984-02-22 1985-09-09 Niles Parts Co Ltd Raindrop detector
JPH03504536A (en) * 1988-03-04 1991-10-03 ファイバーケム、インコーポレーテッド Optical sensors to detect icing and other chemical species

Similar Documents

Publication Publication Date Title
FI810494L (en) TELEVISIONSMOTTAGARE FOERSEDD MED OEVERVAKNINGSFUNKTIONER FOER INBROTTS ALARM OCH SAEKER BETRAKTNINGSDISTANS
JPS57110941A (en) Detector for frosting
US3062961A (en) Circuit controlling device
JPS5341521A (en) Detection of broken glass filam ent yarns
ATE46229T1 (en) FIRE DETECTOR EQUIPPED WITH A SENSOR.
JPS57113328A (en) Low-temperature detecting system by optical fiber
JPS5377544A (en) Optical detector
JPS56115930A (en) Temperature-detecting device
JPS56143934A (en) Temperature sensor
JPS54100751A (en) Detection of connection of optical fibers
JPS57191501A (en) Photoelectric detecting method
JPS52113699A (en) Label detector
JPS5747874A (en) Detection of end point of dry etching reaction
JPS5619439A (en) Photoelectric smoke detector
JPS55162069A (en) Fault detector for electric temperature detector
JPS56163444A (en) Device for detecting blur on window glass
JPS5360259A (en) Detector
JPS5294029A (en) Monitoring method of optical detecting circuit
SU598106A1 (en) Fire alarm
SU1716470A1 (en) Pickup for monitoring of glazed ice
JPS5354337A (en) Defrost controller
JPS56103330A (en) Infrared signal receiver
KR940008117Y1 (en) Oil exchange alarming circuit
JPS556933A (en) Dial turning detection system
JPS5443033A (en) Paper detecting method