JPS5749849A - Automatic hygrometer of electrical resistance type for wide range application - Google Patents

Automatic hygrometer of electrical resistance type for wide range application

Info

Publication number
JPS5749849A
JPS5749849A JP12584980A JP12584980A JPS5749849A JP S5749849 A JPS5749849 A JP S5749849A JP 12584980 A JP12584980 A JP 12584980A JP 12584980 A JP12584980 A JP 12584980A JP S5749849 A JPS5749849 A JP S5749849A
Authority
JP
Japan
Prior art keywords
water content
circuit
current
switch
wide range
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
JP12584980A
Other languages
Japanese (ja)
Other versions
JPS6146778B2 (en
Inventor
Toshio Fujita
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.)
KETSUTO KAGAKU KENKYUSHO KK
Kett Electric Laboratory
Original Assignee
KETSUTO KAGAKU KENKYUSHO KK
Kett Electric Laboratory
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 KETSUTO KAGAKU KENKYUSHO KK, Kett Electric Laboratory filed Critical KETSUTO KAGAKU KENKYUSHO KK
Priority to JP12584980A priority Critical patent/JPS5749849A/en
Priority to US06/298,542 priority patent/US4408128A/en
Publication of JPS5749849A publication Critical patent/JPS5749849A/en
Publication of JPS6146778B2 publication Critical patent/JPS6146778B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/048—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance for determining moisture content of the material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/005—Circuits for altering the indicating characteristic, e.g. making it non-linear

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Nonlinear Science (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

PURPOSE:To measure water content region covering wide range automatically, by converting current, which passes through a specimen, directly to a logarithm without branching out in a low water content region and also by executing the logarithmic conversion through a branch-out circuit by an automatic switch circuit in a high water content region. CONSTITUTION:A couple of electrodes Ea and Eb, which contain grains of specimen, are connected to an oscillator 1 and an operation amplifier IC1 of a branch- out circuit 2. Output of the operation amplifier IC1 is connected to an analog switch SW1 of a semiconductor. Analog switches SW1-SW4 are provided with a movable contact ai and fixed contacts bi and ci (i=1-4), and at first, a1, b1, a2, b2... are connected to form a high water content measuring circuit. A current and voltage logarithmic conversion circuit 3 is composed of an operating amplifier IC2 and diodes D3 and D4, and current passes through a resistance R2. The current enters an operation control circuit 5 through the switch SW4, which is connected between a4 and b4, and a voltage buffer circuit IC3, and in case when a water content signal is determined to be that of low water content, the switch SWi (i=1-4) is connected between ai and ci.
JP12584980A 1979-03-08 1980-09-10 Automatic hygrometer of electrical resistance type for wide range application Granted JPS5749849A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP12584980A JPS5749849A (en) 1980-09-10 1980-09-10 Automatic hygrometer of electrical resistance type for wide range application
US06/298,542 US4408128A (en) 1979-03-08 1981-09-01 Electric resistance type wide range moisture meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12584980A JPS5749849A (en) 1980-09-10 1980-09-10 Automatic hygrometer of electrical resistance type for wide range application

Publications (2)

Publication Number Publication Date
JPS5749849A true JPS5749849A (en) 1982-03-24
JPS6146778B2 JPS6146778B2 (en) 1986-10-16

Family

ID=14920457

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12584980A Granted JPS5749849A (en) 1979-03-08 1980-09-10 Automatic hygrometer of electrical resistance type for wide range application

Country Status (1)

Country Link
JP (1) JPS5749849A (en)

Also Published As

Publication number Publication date
JPS6146778B2 (en) 1986-10-16

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