ES2165809A1 - Measurement system based on ISFET-MEMFET sensors permits variation of sensor operating point and determination of ion concentration in liquid medium - Google Patents
Measurement system based on ISFET-MEMFET sensors permits variation of sensor operating point and determination of ion concentration in liquid mediumInfo
- Publication number
- ES2165809A1 ES2165809A1 ES200001621A ES200001621A ES2165809A1 ES 2165809 A1 ES2165809 A1 ES 2165809A1 ES 200001621 A ES200001621 A ES 200001621A ES 200001621 A ES200001621 A ES 200001621A ES 2165809 A1 ES2165809 A1 ES 2165809A1
- Authority
- ES
- Spain
- Prior art keywords
- memfet
- liquid medium
- isfet
- sensor
- determination
- 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
Links
Abstract
A measurement system based on ISFET/MEMFET sensors permits the variation of the sensor operating point and the determination of the ion concentration in a liquid medium. The circuit involved is formed by two sources of current, two resistances, two operational amplifiers, a feed and measurement unit, an electro-metric ammeter, a reference electrode, and finally a chemical sensor (ISFET/MEMFET), the latter being immersed in the liquid medium which it is required to analyze. The circuit can be utilized as a measurement circuit, to ascertain the activity of the ion H+ in the liquid medium or other ion where a MEMFET sensor is employed, maintaining a fixed operation point or as a characterization circuit, in which the operation point can be controlled, that is to say the current of the sensor and the polarization tension, centering the study in the sensor itself.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES200001621A ES2165809B1 (en) | 2000-06-21 | 2000-06-21 | MEASUREMENT SYSTEM BASED ON ISFETS / MEMFETS SENSORS THAT ALLOWS TO VARY THE SENSOR OPERATION POINT AND DETERMINE THE CONCENTRATION OF IONS IN A LIQUID MEDIUM. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES200001621A ES2165809B1 (en) | 2000-06-21 | 2000-06-21 | MEASUREMENT SYSTEM BASED ON ISFETS / MEMFETS SENSORS THAT ALLOWS TO VARY THE SENSOR OPERATION POINT AND DETERMINE THE CONCENTRATION OF IONS IN A LIQUID MEDIUM. |
Publications (2)
Publication Number | Publication Date |
---|---|
ES2165809A1 true ES2165809A1 (en) | 2002-03-16 |
ES2165809B1 ES2165809B1 (en) | 2003-02-16 |
Family
ID=8494072
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES200001621A Expired - Fee Related ES2165809B1 (en) | 2000-06-21 | 2000-06-21 | MEASUREMENT SYSTEM BASED ON ISFETS / MEMFETS SENSORS THAT ALLOWS TO VARY THE SENSOR OPERATION POINT AND DETERMINE THE CONCENTRATION OF IONS IN A LIQUID MEDIUM. |
Country Status (1)
Country | Link |
---|---|
ES (1) | ES2165809B1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4657658A (en) * | 1984-11-07 | 1987-04-14 | Alastair Sibbald | Semiconductor devices |
EP0315790A1 (en) * | 1987-10-13 | 1989-05-17 | Taiyo Yuden Co., Ltd. | Chemical sensors and their divided parts |
US5309085A (en) * | 1990-08-21 | 1994-05-03 | Byung Ki Sohn | Measuring circuit with a biosensor utilizing ion sensitive field effect transistors |
US5911873A (en) * | 1997-05-02 | 1999-06-15 | Rosemount Analytical Inc. | Apparatus and method for operating an ISFET at multiple drain currents and gate-source voltages allowing for diagnostics and control of isopotential points |
EP0922955A2 (en) * | 1997-12-13 | 1999-06-16 | Eastman Kodak Company | Ion concentration and pH measurement |
WO2000036408A1 (en) * | 1998-12-16 | 2000-06-22 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. | Device for measuring ion concentrations in a measuring liquid |
-
2000
- 2000-06-21 ES ES200001621A patent/ES2165809B1/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4657658A (en) * | 1984-11-07 | 1987-04-14 | Alastair Sibbald | Semiconductor devices |
EP0315790A1 (en) * | 1987-10-13 | 1989-05-17 | Taiyo Yuden Co., Ltd. | Chemical sensors and their divided parts |
US5309085A (en) * | 1990-08-21 | 1994-05-03 | Byung Ki Sohn | Measuring circuit with a biosensor utilizing ion sensitive field effect transistors |
US5911873A (en) * | 1997-05-02 | 1999-06-15 | Rosemount Analytical Inc. | Apparatus and method for operating an ISFET at multiple drain currents and gate-source voltages allowing for diagnostics and control of isopotential points |
EP0922955A2 (en) * | 1997-12-13 | 1999-06-16 | Eastman Kodak Company | Ion concentration and pH measurement |
WO2000036408A1 (en) * | 1998-12-16 | 2000-06-22 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. | Device for measuring ion concentrations in a measuring liquid |
Also Published As
Publication number | Publication date |
---|---|
ES2165809B1 (en) | 2003-02-16 |
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