G - Physics – 01 – N
Patent
G - Physics
01
N
356/149, 324/23
G01N 27/416 (2006.01) G01N 27/414 (2006.01)
Patent
CA 1237770
ABSTRACT OF THE DISCLOSURE The measuring device (10) comprises an ISFET (12) used as a chemically selective ion sensor, a reference electrode (20) positioned adjacent the ISFET (12), an amplifier (22) coupled to the ISFET and control/correction circuitry (30) coupled to the ISFET (12), to the refer- ence electrode (20) and to the amplifier (22). The con- trol/correction circuitry (30) is operable to maintain the drain-source current IDS of the ISFET (12) at a constant value and to correct drift effects of the ISFET (12) on the basis of the logarithmic equation: .DELTA.vp = A 1n(t/to +1) where: .DELTA.Vp = potential drift A = scale factor for drift and amplitude to = time constant defining the dependence on time t = time during which the sensor is operative in the event of continuous operation.
466881
Leuveld Jozef G.m.
Ligtenberg Hendrikus C.g.
Borden Ladner Gervais Llp
Sentron V.o.f.
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