Thick Film Sensors by Prudenziati, M.(eds.)

By Prudenziati, M.(eds.)

This article explores thick-film know-how. It identifies the functions of thick-film sensors and actions within the improvement of units. Hybrid circuits for sign processing; production of architectural constructions; and transducing parts derived from thick-film pastes are coated.

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The next stage of the process is to dry the film to remove the organic solvents from the paste. This task can be performed in a conventional box oven but is more often accomplished with an infra-red belt drier. After this stage the dried film is relatively immune to smudging and the substrates can be handled. Sometimes it is permissible to screen print the next layer directly after the drying stage, but this really depends on the nature of inks being deposited. The films themselves contain fine powders which must be exposed to a high temperature in order to form a solid, composite material.

The acceptable tolerances for positioning and repeatability of the substrate holder are similar to those quoted for the screen mounting. The two most common ways of holding the substrates are with a vacuum chuck or a recessed jig. In a vacuum chuck arrangement the substrates are registered by butting two of their edges against two datum faces. The alternative is a recessed chuck which is fitted with locating pins and a clamping edge. The depth of the recess is around 100 microns less than the thickness of a substrate.

Surfometer profile across a thick film resistor and end terminations. 15 material like sapphire or diamond and is therefore unsuitable for measuring the thickness of wet films. However, it is now possible to purchase laser systems which can replace the conventional stylus and transducer head, thereby providing a non-contact,accurate technique for obtaining detailed measurements of either wet, dried or fired films. Figure 8 shows the graphical output from a conventional surfometer which has scanned the length ofa resistor and its end terminations.

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