METHOD AND DEVICE TO MEASURE PHYSICAL VALUE WITH LOCAL RESOLUTION Russian patent published in 2012 - IPC G01J11/00 G02B27/32 

FIELD: measurement equipment.

SUBSTANCE: device for measurement of a physical value with local resolution, comprising facilities for generation of the first electric signal (6) with the first frequency and the second electric signal (7) with the second frequency, differing from the first one by the value of differential frequency, a source of optical radiation for generation of an optical signal, which is modulated by the first frequency and may interact with the object of measurement, as a result of which the following may be modified: a mixer (11), which may mix the electric signal (10) produced on the basis of the optical signal with the second signal (7), a digital-to-analogue converter (13) to digitise at least one mixed signal (12) and in particular the facilities for generation of the third electric signal (8) with the third frequency made in the form of a DDS system (3), besides, the third frequency corresponds to the differential frequency or exceeds it several times, at the same time the digital-to-analogue converter (13) may scan the mixed signal (12) for its digitisation with the third frequency.

EFFECT: measurement of a physical value with local resolution.

10 cl, 4 dwg