Interferometric device having a controllable Fabry-Perot
AssigneeHartmann & Braun Aktiengesellschaft
InventorMichael Zoechbauer
Life of this patent
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Abstract
An interferometric device for the detection of substances having a periodic or quasiperiodic absorption structure of their absorption spectrum includes a source of radiation, a chamber containing the material to be investigated and a downstream detector, a thermo-optically effective and temperature controlled interference filter means is interposed, its thickness determines the spacing of interference transmission lines and temperature control shifts these lines.
Claims6
Interferometric device for the detection of substances having a periodic or quasiperiodic absorption structure of their absorption spectrum including a source of radiation, a chamber containing the material to be investigated and interference filter means with a thickness that determines the spacing of interference transmission lines and a downstream detector, the improvement comprising,
- the filter being a thermooptically tunable filter including a plate made of thermooptical active material, and semitransparent mirror surfaces in the said radiation path;
- and
- means for variably controlling the temperature of said filter.
Dependencies are inferred from the claim text.