JPS57166563A - Voltage detector - Google Patents

Voltage detector

Info

Publication number
JPS57166563A
JPS57166563A JP5272681A JP5272681A JPS57166563A JP S57166563 A JPS57166563 A JP S57166563A JP 5272681 A JP5272681 A JP 5272681A JP 5272681 A JP5272681 A JP 5272681A JP S57166563 A JPS57166563 A JP S57166563A
Authority
JP
Japan
Prior art keywords
frequency
output
circuit
pyroelectric body
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
JP5272681A
Other languages
Japanese (ja)
Other versions
JPH0424666B2 (en
Inventor
Masao Kasahara
Ritsuo Inaba
Kiyotaka Wasa
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 JP5272681A priority Critical patent/JPS57166563A/en
Priority to DE8282101663T priority patent/DE3267090D1/en
Priority to EP82101663A priority patent/EP0061033B1/en
Priority to US06/356,145 priority patent/US4553099A/en
Publication of JPS57166563A publication Critical patent/JPS57166563A/en
Publication of JPH0424666B2 publication Critical patent/JPH0424666B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE:To reduce the influence of a creep phenomenon and that of drift under various conditions by applying a voltage developed at a pyroelectric body to the electrode of a surface acoustic wave delay medium while varying it at a constant frequency, and then detecting variation in oscillation frequency. CONSTITUTION:An feedback oscillator consists of a surface acoustic wave propagation medium 1, electrodes 2 and 3, and an amplifier 4, and its output frequency varies with an electric field between electrodes 7 and 8. When a pyroelectric body 10 is oscillated at a frequency f1 by a driving circuit 26, electrostatic capacity between a charge plate 16 and the pyroelectric body 10 varies to vary a potential V1, and the oscillation output is led out as a signal which is frequency-modulated at the oscillation frequency f1. This FM signal output is applied to an arithmetic circuit 28 through a mixing circuit 21, an FM detecting circuit 23, and an amplifier 25 and multiplied by the phase shift output of the driving circuit 26 to detect a potential to be measured from spectral components of the frequency f1. Consequently, stability against noises is obtained and the S/N ratio of the output signal is improved.
JP5272681A 1981-03-06 1981-04-07 Voltage detector Granted JPS57166563A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP5272681A JPS57166563A (en) 1981-04-07 1981-04-07 Voltage detector
DE8282101663T DE3267090D1 (en) 1981-03-06 1982-03-04 Electrostatic voltage sensor
EP82101663A EP0061033B1 (en) 1981-03-06 1982-03-04 Electrostatic voltage sensor
US06/356,145 US4553099A (en) 1981-03-06 1982-03-08 Electrostatic voltage sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5272681A JPS57166563A (en) 1981-04-07 1981-04-07 Voltage detector

Publications (2)

Publication Number Publication Date
JPS57166563A true JPS57166563A (en) 1982-10-14
JPH0424666B2 JPH0424666B2 (en) 1992-04-27

Family

ID=12922920

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5272681A Granted JPS57166563A (en) 1981-03-06 1981-04-07 Voltage detector

Country Status (1)

Country Link
JP (1) JPS57166563A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5652725A (en) * 1979-10-08 1981-05-12 Canon Inc Automatic film winder of camera

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5652725A (en) * 1979-10-08 1981-05-12 Canon Inc Automatic film winder of camera

Also Published As

Publication number Publication date
JPH0424666B2 (en) 1992-04-27

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