G - Physics – 01 – D
Patent
G - Physics
01
D
G01D 5/26 (2006.01) G01K 11/32 (2006.01) H01S 3/00 (2006.01)
Patent
CA 2743694
A device for spatially resolved measuring of a physical variable, comprising means for generating a first electrical signal (6) with a first frequency and a second electrical signal (7) with a second frequency, which differs from the first frequency by a difference frequency, an optical radiation source for generating an optical signal modulated by the first frequency, which optical signal can interact with a test object and be modified in the process, a mixer (11), which can mix an electrical signal (10) emerging from the optical signal with the second signal (7), a D/A converter (13) for digitizing the at least one mixed signal (12), and furthermore means, more particularly embodied as a DDS system (3), for generating a third electrical signal (8) with a third frequency, wherein the third frequency corresponds to the difference frequency or a multiple of the difference frequency, and wherein the D/A converter (13) can sample the mixed signal (12) at the third frequency in order to digitize it.
Fromme Martin
Hill Wieland
Kuebler Jochen
Roda Ingo
Lios Technology Gmbh
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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