Sensor for measuring an ion concentration or gas concentration

Details Sensor for measuring an ion concentration or gas concentration Sensor for measuring an ion concentration or gas concentration

2005-10-18

2005-10-18

Nguyen, Nam (Department: 1753)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C204S415000, C204S406000, C257S253000

Reexamination Certificate

active

06955749

ABSTRACT:
The invention relates to a sensor for measuring ion concentration or gas concentration, with a gas- or ion-sensitive layer (6) that has two sensitive partial areas (20and21), two conducting areas (1band2b), each coupled capacitively through air gaps (9and10) with one of the sensitive partial areas (20and21), with the capacitances of the couplings being different, and a comparison circuit (1a, 2a, 3, 4, 5) which has at least one first transistor (T1) connected with the first conductive area and a second transistor (T2) connected with the second conductive area, and at least one output at which a signal can be tapped that depends on the potential of sensitive layer (6).

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Gergintschew et al., “The capacitively controlled field effect transistor (CCFED) as a new low power gas sensor”, Elsevier Science S.A., B 35-36, 1996, 285-289.

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