IT1053933B - Temp. and voltage compensated electret sensor - has sensing circuit connected to two conductive layers for specified compensation - Google Patents

Temp. and voltage compensated electret sensor - has sensing circuit connected to two conductive layers for specified compensation

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Publication number
IT1053933B
IT1053933B IT4797376A IT4797376A IT1053933B IT 1053933 B IT1053933 B IT 1053933B IT 4797376 A IT4797376 A IT 4797376A IT 4797376 A IT4797376 A IT 4797376A IT 1053933 B IT1053933 B IT 1053933B
Authority
IT
Italy
Prior art keywords
layer
electret
sensing circuit
temp
conductive layers
Prior art date
Application number
IT4797376A
Other languages
Italian (it)
Original Assignee
Minnesota Mining & Mfg
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 Minnesota Mining & Mfg filed Critical Minnesota Mining & Mfg
Priority to IT4797376A priority Critical patent/IT1053933B/en
Application granted granted Critical
Publication of IT1053933B publication Critical patent/IT1053933B/en

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Abstract

The sensor has an electret layer of polarised material with both piezoelectric and pyroelectric properties. The layer generates electrostatic charges of opposite polarity on its surfaces under the effect of temperature and voltage variations. One side of the electret layer is in close planar contact with a conductive layer. A second electret layer of the same properties is arranged parallel to the first layer and has also a second conductive layer. A third conductive layer is sandwiched between the other sides of the two electret layers. An electronic sensing circuit (10) is connected to at least two conductive layers in such manner that, when the electret layers are exposed to identical temperature changes and opposite voltage changes, the circuit picks up the electrostatic charges, while not responding to electrostatic charges due to the other change of the two states.
IT4797376A 1976-02-05 1976-02-05 Temp. and voltage compensated electret sensor - has sensing circuit connected to two conductive layers for specified compensation IT1053933B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
IT4797376A IT1053933B (en) 1976-02-05 1976-02-05 Temp. and voltage compensated electret sensor - has sensing circuit connected to two conductive layers for specified compensation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT4797376A IT1053933B (en) 1976-02-05 1976-02-05 Temp. and voltage compensated electret sensor - has sensing circuit connected to two conductive layers for specified compensation

Publications (1)

Publication Number Publication Date
IT1053933B true IT1053933B (en) 1981-10-10

Family

ID=11263704

Family Applications (1)

Application Number Title Priority Date Filing Date
IT4797376A IT1053933B (en) 1976-02-05 1976-02-05 Temp. and voltage compensated electret sensor - has sensing circuit connected to two conductive layers for specified compensation

Country Status (1)

Country Link
IT (1) IT1053933B (en)

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