JPS5748645A - Comparative detector - Google Patents

Comparative detector

Info

Publication number
JPS5748645A
JPS5748645A JP55094673A JP9467380A JPS5748645A JP S5748645 A JPS5748645 A JP S5748645A JP 55094673 A JP55094673 A JP 55094673A JP 9467380 A JP9467380 A JP 9467380A JP S5748645 A JPS5748645 A JP S5748645A
Authority
JP
Japan
Prior art keywords
sensor
comparator
resistance
potential
output
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
JP55094673A
Other languages
Japanese (ja)
Other versions
JPS649578B2 (en
Inventor
Shinichi Nakane
Naoyoshi Maehara
Takashi Uno
Eiichi Tanaka
Yukiro Komai
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 JP55094673A priority Critical patent/JPS5748645A/en
Publication of JPS5748645A publication Critical patent/JPS5748645A/en
Publication of JPS649578B2 publication Critical patent/JPS649578B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
    • G01N27/122—Circuits particularly adapted therefor, e.g. linearising circuits

Abstract

PURPOSE:To make comparative detection of good accuracy possible for a sensor having a wide range of resistance change by fixing reference potential roughly at the intermediate potential of an electric power source and operating the comparing potential side including sensor like pulses. CONSTITUTION:The signal of a pulse oscillation part 10 is transmitted via resistances 11, 12 to a transistor 13 which is a switch means, and a resistance 25 is connected in parallel and disconnects to a resistance 24 connected in series to a sensor 5. Thereby, the comparative input potential of a comparator 14 is made pulse voltage. The reference potential of the comparator 14 is set roughly at the intermediate of source voltage E by resistances 26, 27. For example, when a combustion state is detected by using TiO2 as a sensor 5, the output of the comparator 14 is a low level until the ignition is detected but the sensor exposed to a high temp. atmosphere after the ignition decreases its resistance value owing to thermistor characteristics and a pulse signal is generated in the output of the comparator 14. Further when the sensor goes into a flame in the state of oxygen default, its resistance sharply decreases and the output of the comparator 14 is fixed at a high level.
JP55094673A 1980-07-10 1980-07-10 Comparative detector Granted JPS5748645A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55094673A JPS5748645A (en) 1980-07-10 1980-07-10 Comparative detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55094673A JPS5748645A (en) 1980-07-10 1980-07-10 Comparative detector

Publications (2)

Publication Number Publication Date
JPS5748645A true JPS5748645A (en) 1982-03-20
JPS649578B2 JPS649578B2 (en) 1989-02-17

Family

ID=14116744

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55094673A Granted JPS5748645A (en) 1980-07-10 1980-07-10 Comparative detector

Country Status (1)

Country Link
JP (1) JPS5748645A (en)

Also Published As

Publication number Publication date
JPS649578B2 (en) 1989-02-17

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