Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
권호 표지

Improvement of reliability of an ISFET pH-meter by employing multiple sensors

  • Chang, Kee-Seok (Dept. of Sensor Eng., Kyungpook Nat'l Uni.) ;
  • Cho, Byung-Woog (School of Electronic and Electrical Eng., Kyungpook Nat'l Uni.) ;
  • Kim, Chang-Soo (Sensor Technology Research Center, Kyungpook Nat'l Uni.) ;
  • Choi, Sang-Bok (Dept. of Sensor Eng., Kyungpook Nat'l Univ.) ;
  • Sohn, Byung-Ki (School of Electronic and Electrical Eng., Kyungpook Nat'l Uni.)
  • Published : 1997.03.31
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Abstract

The ISFET(ion sensitive field effect transistor), a semiconductor ion sensor, has many advantages over conventional ion sensors. Various single-sensor type ISFET pH-meters have been developed. However, they could not be applied in fields because their performances are directly affected by the sensor condition. With only one sensor, the system could be easily damaged from environmental factors, and reliability of it is decreased. Therefore, a 4-channel PH-meter system is proposed to improve the reliability of ISFET pH-meter. It has 4 ISFETS as ion sensor, and a software which contains a new calibration and measurement algorithm appropriate to the system. The reliability of the system was proved by measuring hydrogen ion concentration in the pH standard solutions and buffer solutions.

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