Microdielectrometer sensor

Fig. 6. Cross-Section of microdielectrometer sensor. The silicon dioxide insulator is much thinner than the electrode spacing. Y(eo) is the comb electrode admittance CL is the capacitance between the floating electrode and the substrate.

A schematic view of a microdielectrometer sensor is shown in Fig. 8 and illustrates the electrode array, the field-effect transistors and a silicon diode temperature indicator 15) which functions as a moderate accuracy ( 2 °C) thermometer between room temperature and 250 °C. The sensor is used either by placing a small sample of resin over the electrodes, or by embedding the sensor in a reaction vessel or laminate. Since all dielectric and conductivity properties are temperature dependent, the ability to make a temperature measurement at the same point as the dielectric measurement is a useful feature of this technique. 

Fig. 7. Calibration of the microdielectrometer sensor, showing contours of constant permittivity and loss factor as a function of the magnitude and phase of the transfer function H(o>). (Reprinted from Ref. 7) with permission of IEEE, 1985 IEEE.)...

Fig. 8. Schematic top view of actual microdielectrometer sensor, illustrating the comb electrode structure, field effect transistors and thermal diode temperature indicator. (Reprinted with permission of Micromet Instruments, Inc.)...

Fig. 17. Cole-Cole diagram of the dielectric properties of a DGEBA epoxy resin measured on a microdielectrometer sensor with blocking layers of indicated thickness. (Reprinted from Ref. 38> with permission of Gordon and Breach Science Publishers)...

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