Method and apparatus for the generation of closely adjacent frequency signals, and at the same time a predetermined phase relationship, for optically not - interferometric and phases - measurements

摘要

procedurefor the production of at least two sinus or cosinusf & all rmigen signals;with very close to the frequencies using aan electronic circuit with the replica of aadditionstheorems r & t.; rtrigonometric functions, either sin (& ohgr plusmn; &; & dgr; t = sin (& ohgr; t) cos (& dgr; t) & plusmn; cos (& ohgr; t) sin (& dgr; t) or cos (& ohgr plusmn; &; & dgr; t = cos (& ohgr; t) cos (& dgr; t) & ndash; / + sin (& ohgr; t) sin (& dgr; t), and a signal with thefrequency of f & plusmn formed; df, which, together with a predetermined high frequencyf or a point from a generatorfrequenz.high frequency (signalpaar with close lyingfrequency is characterized dassa) low-frequencyimpart and cosinussignale with a frequency df the defaultthe frequenzdifferenz is adapted to be provided; (b)a high frequency clock with the generatorfrequenz is imposedfrom either & ndash; usingtwo d flip flops by point extracted frequencyf is generated or & ndash;the reproduction of the betragsfunktion sinus or analogue cosine functionshigh frequency digital sinus and...