JPS55119064A - Surface electrometer - Google Patents
Surface electrometerInfo
- Publication number
- JPS55119064A JPS55119064A JP2732879A JP2732879A JPS55119064A JP S55119064 A JPS55119064 A JP S55119064A JP 2732879 A JP2732879 A JP 2732879A JP 2732879 A JP2732879 A JP 2732879A JP S55119064 A JPS55119064 A JP S55119064A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- potential
- measuring electrode
- fet110
- erased
- 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.)
- Pending
Links
Abstract
PURPOSE: To enable to accurately measure the surface potential of a material by applying a DC voltage to a measuring electrode through an element having a high resistance, whereby an offset voltage remaining in the measuring electrode can be erased.
CONSTITUTION: When a chopper vane 103 is roated to open and close a potential detection bore 107, an electric field between a material 106 to be measured and a measuring electrode 104 is varied to generate an extremely small amount of AC voltage in the electrode. The amplitude of this AC voltage is proportional to the potential of the material 106. This AC voltage is converted into a low-impedance signal by a FET110, amplified to a desired value by an AC amplifier 112 and subjected to rectifying integration in a recticfier integrating circuit 113. As a result, an output of a DC voltage in proportion to the potential of the material 106 are obtained. In the FET110, a gate voltage is kept positive by DC bias power source 118. Accordingly, an offset potential Eo remaining in the measuring electrode 104 can be erased so that the surface potential of the material 106 can be accurately measured.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2732879A JPS55119064A (en) | 1979-03-09 | 1979-03-09 | Surface electrometer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2732879A JPS55119064A (en) | 1979-03-09 | 1979-03-09 | Surface electrometer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55119064A true JPS55119064A (en) | 1980-09-12 |
Family
ID=12217998
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2732879A Pending JPS55119064A (en) | 1979-03-09 | 1979-03-09 | Surface electrometer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55119064A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59119278A (en) * | 1982-12-13 | 1984-07-10 | ザ・シムコ・カンパニ−・インコ−ポレイテツド | Panoramic electrostatic field sensor |
US5187442A (en) * | 1988-09-29 | 1993-02-16 | Friedemann Freund | Method and apparatus for charge distribution analysis |
-
1979
- 1979-03-09 JP JP2732879A patent/JPS55119064A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59119278A (en) * | 1982-12-13 | 1984-07-10 | ザ・シムコ・カンパニ−・インコ−ポレイテツド | Panoramic electrostatic field sensor |
US5187442A (en) * | 1988-09-29 | 1993-02-16 | Friedemann Freund | Method and apparatus for charge distribution analysis |
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