Patent ID: 9279723
Filing Date: 2016-03-08
CPC Classification: G01J,G01N

Claim Text:
1. A method for use in spectroscopic measurements of a sample, the method comprising: generating inspecting and reference electro-magnetic radiation components of substantially the same frequency contents, said inspecting and reference electro-magnetic radiation components being swept according to a predetermined frequency pattern, directing said inspecting and reference radiation components to a detector along first and second different paths, respectively, allowing interaction of the inspecting radiation component with a sample located in the first path, thereby inducing a frequency difference between a frequency content of the inspecting radiation component and the reference radiation component interacting at the detector a signal resulting from said interaction between said inspecting and reference radiation components being indicative of one or more properties of the sample at a location where said inspecting radiation interacts with the sample; and controlling at least one of said predetermined pattern and the propagation of the inspecting and reference radiation components to the detector; wherein said controlling of said predetermined pattern of the frequency sweeping comprises concurrently affecting a firs, global frequency sweeping rate during a certain time period and a local modulation of the frequency sweeping with a second higher sweeping rate.