Abstract
Progress in optical instrumentation for thermal expansion in the 1980s is reported. These instruments present some common features: (1) they are designed to operate at high temperatures; (2) they use optoelectronic detection so they can be linked to automatic data acquisition systems; and (3) they provide high-rate data acquisition. Three instruments follow a geometrical approach (profile projector or location with a laser beam), while two other ones are interferometric.
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