Sensors elaborated using sintered materials

As discussed in Chapter 7, this kind of sensor will, in this book, always be elaborated using tin dioxide. 

Only the micro-bars obtained by carving in a block of sintered tin dioxide have been used. These bars, in the shape of a parallelepiped, whose dimensions are 0.5 x 0.5 X 2 mm, can be fixed on two kinds of supports. 

The heating element is deposited using the same principle the deposit composed of platinum is located on the central part of the support. The sensitive bar is directly fixed at the back of the heating element using a gold paste. The cormections to the external circuits are elaborated using this very paste. 

Serigraphed gold lines on the snpport allow, in effect, the relay of these connections in the distant zones of the heating element sitnated at the other end of the snpport. The temperatnre of the lines is then compatible with a process of soldering nsing tin. 

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We will distinguish here two kinds of sensors the sensors which use sensitive elements elaborated using sintered materials, and those that exploit thick films. 

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