Optical Array Transducers

Tuesday, October 17th, 2017 - Light, Photovoltaic

Optical Array Transducers

As well as the basic devices thus described, there are others that embody more than one elementary transducer in their construction and are thus referred to as ‘composite’ or, more specifically, ‘array’ transducers.

Optical array transducers

Figure 1 Optical array transducer

These devices are in fact based on arrays of photosensitive elements known as photosites, with each array element working on the same principles as the elementary transducers described in the previous paragraphs. The array can be two dimensional, and is then known as an area array or area imaging device (AID) as shown in Figure 1, or it can be one dimensional in which case it is called a linear array or linear imaging device (LID).

The technology used in the construction of these array transducers also allows a natural subdivision in to: vacuum and solid state devices which are more commonly known as, respectively, vacuum and solid state cameras, Solid state and, to a lesser extent, vacuum cameras are growing in importance in the automation and robotics fields due to their increasing use in applications requiring non-contact inspection and measurement (Batche­ lor, 1985; Pugh, 1983); this is particularly true, for solid state linear array transducers (sometimes referred to as linescan cameras) which are extensively used to measure edge positions in such diverse applications as arc welding path control (Drews et al., 1986), food manufacturing process control (Electronic Automation, 1985; Hollin­ gum, 1984) and automated car production (Austin Rover 1984; Hollingum, 1984).

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