JPS5735744A - Frost sensor - Google Patents

Frost sensor

Info

Publication number
JPS5735744A
JPS5735744A JP11024380A JP11024380A JPS5735744A JP S5735744 A JPS5735744 A JP S5735744A JP 11024380 A JP11024380 A JP 11024380A JP 11024380 A JP11024380 A JP 11024380A JP S5735744 A JPS5735744 A JP S5735744A
Authority
JP
Japan
Prior art keywords
coil
ribbon
oscillator
coils
amplifier
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
JP11024380A
Other languages
Japanese (ja)
Inventor
Norio Goto
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.)
Hitachi Ltd
Proterial Ltd
Original Assignee
Hitachi Ltd
Hitachi Metals 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 Hitachi Ltd, Hitachi Metals Ltd filed Critical Hitachi Ltd
Priority to JP11024380A priority Critical patent/JPS5735744A/en
Publication of JPS5735744A publication Critical patent/JPS5735744A/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
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/02—Analysing fluids
    • G01N29/036—Analysing fluids by measuring frequency or resonance of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/025—Change of phase or condition
    • G01N2291/0256—Adsorption, desorption, surface mass change, e.g. on biosensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/02845—Humidity, wetness

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (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 Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

PURPOSE:To simplify a circuit configuration, by omitting an oscillator, a rectifier and a comparator. CONSTITUTION:On a magnetic distortion ribbon 1 which has been supported by supporting bodies 2A, 2B are provided an elastic wave energizing coil 12 and a detection coil 13, which have been wound around a rodlike magnetic core. The magnetic pole direction of the coils 12, 13 and a bias magnet 5 are set in the same dirction of the ribbon width, so that a ribbon width resonance is generated. Between the coils 12, 13 is connected an amplifier 14, an output is applied to the coil 12, a detection signal which the coil 13 obtains is positive-fed-back to the amplifier 14, an oscillator is constituted, and is oscillated by 250KHz being a width resonance frequency. In case when frost falls on the magentic distrotion ribbon 1, as for its transmission characteristic, a porpagation loss increases, an output decreases, and if gain of one-round becomes <''1'', the oscillation stops. Whether the oscillation which is obtained from an output terminal 11 exists or not corresponds to whether frost falls or not.
JP11024380A 1980-08-13 1980-08-13 Frost sensor Pending JPS5735744A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11024380A JPS5735744A (en) 1980-08-13 1980-08-13 Frost sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11024380A JPS5735744A (en) 1980-08-13 1980-08-13 Frost sensor

Publications (1)

Publication Number Publication Date
JPS5735744A true JPS5735744A (en) 1982-02-26

Family

ID=14530728

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11024380A Pending JPS5735744A (en) 1980-08-13 1980-08-13 Frost sensor

Country Status (1)

Country Link
JP (1) JPS5735744A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010512505A (en) * 2006-12-09 2010-04-22 ザ・ユニバーシティ・オブ・シェフィールド Magnetostrictive substance detection system and method
JP2013089206A (en) * 2011-10-21 2013-05-13 Fuji Electric Co Ltd Wireless sensor system and wireless sensor
CN103308556A (en) * 2012-03-13 2013-09-18 汉达精密电子(昆山)有限公司 Automatic detection device for neglected loading of magnet and magnetic pole direction

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010512505A (en) * 2006-12-09 2010-04-22 ザ・ユニバーシティ・オブ・シェフィールド Magnetostrictive substance detection system and method
JP2013089206A (en) * 2011-10-21 2013-05-13 Fuji Electric Co Ltd Wireless sensor system and wireless sensor
CN103308556A (en) * 2012-03-13 2013-09-18 汉达精密电子(昆山)有限公司 Automatic detection device for neglected loading of magnet and magnetic pole direction

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