JPS57187615A - Self-correction circuit for detection sensitivity - Google Patents

Self-correction circuit for detection sensitivity

Info

Publication number
JPS57187615A
JPS57187615A JP56072714A JP7271481A JPS57187615A JP S57187615 A JPS57187615 A JP S57187615A JP 56072714 A JP56072714 A JP 56072714A JP 7271481 A JP7271481 A JP 7271481A JP S57187615 A JPS57187615 A JP S57187615A
Authority
JP
Japan
Prior art keywords
detection
comparator
integration
voltage
signal
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
JP56072714A
Other languages
Japanese (ja)
Other versions
JPS6322244B2 (en
Inventor
Masahiro Tarui
Yasumoto Suzuki
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.)
Anritsu Corp
Original Assignee
Anritsu 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 Anritsu Corp filed Critical Anritsu Corp
Priority to JP56072714A priority Critical patent/JPS57187615A/en
Publication of JPS57187615A publication Critical patent/JPS57187615A/en
Publication of JPS6322244B2 publication Critical patent/JPS6322244B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/02—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation
    • G01D3/024—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation for range change; Arrangements for substituting one sensing member by another

Landscapes

  • Engineering & Computer Science (AREA)
  • Technology Law (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)

Abstract

PURPOSE:To make automatic correction of detection sensitivity in accordance with variation in noise level in metal detection devices by comparing standard voltage that is integration of the outputs of detection circuit and the output voltage and making the item constant of integration variable in accordance with the value of integration voltage. CONSTITUTION:The output signal of a detection circuit 10 for detecting a non- metallic object such as a metal mixed in food is input to a detection sensitivity automatic correction circuit 20. The input signal is given to a comparator 21 through a variable resistors R1 and R2, and also to a integrator 23 that consists of R3 and R4 and a condenser C1 through an analog switch 2 and to the other input of the comparator 21 through R5. The comparator 21 outputs detection signal e when the output voltage of a circuit 10 exceeds the integration voltage of the integrator 23. The input signal is also given to a comparator 24 through R6 and when the output of the integrator is larger, the switch 22 is changed over to the R4 side through R7. R4 is set at a resistance value smaller than that of R3. With this arrangement exact signal detection can be effected even if noise components change.
JP56072714A 1981-05-13 1981-05-13 Self-correction circuit for detection sensitivity Granted JPS57187615A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56072714A JPS57187615A (en) 1981-05-13 1981-05-13 Self-correction circuit for detection sensitivity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56072714A JPS57187615A (en) 1981-05-13 1981-05-13 Self-correction circuit for detection sensitivity

Publications (2)

Publication Number Publication Date
JPS57187615A true JPS57187615A (en) 1982-11-18
JPS6322244B2 JPS6322244B2 (en) 1988-05-11

Family

ID=13497291

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56072714A Granted JPS57187615A (en) 1981-05-13 1981-05-13 Self-correction circuit for detection sensitivity

Country Status (1)

Country Link
JP (1) JPS57187615A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0327130A2 (en) * 1988-02-05 1989-08-09 WEBER S.r.l. System for converting a signal from a linear transducer for enabling parameter acquisition to varying degrees of accuracy

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3083328B1 (en) * 2018-06-28 2021-06-18 Alessandro Manneschi PORTABLE DETECTION SYSTEM INCLUDING MAGNETOSTATIC SENSORS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0327130A2 (en) * 1988-02-05 1989-08-09 WEBER S.r.l. System for converting a signal from a linear transducer for enabling parameter acquisition to varying degrees of accuracy

Also Published As

Publication number Publication date
JPS6322244B2 (en) 1988-05-11

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