The accurate measurement of the Casimir force and the search for hypothetic
al long-range interactions are subjects of growing interest. In this paper
we propose to use a suspended interferometric device to measure the Casimir
effect between metallic flat surfaces. This allows us to perform the measu
rement at distances much larger than the ones used in previous measurements
with spherical surfaces. The use of the proposed dynamic detection scheme
can also help in the discrimination of the different contributions to the m
easured force. Some considerations about the physical information which can
be obtained from this type of measurement are also made. [S0556-2821(99)04
502-6].