Patent ID: 9651429
Date: 2017-05-16
CPC Classifications: G01J

Claim:
1. An optical measuring device, for measuring a wavelength of a response from a sensing device, the optical measuring device comprising a light path coupled to an interface for coupling the light path to the sensing device; a periodic optical filter with an input coupled to the light path, to sample light that is supplied to or received from the sensing device; a first detector coupled to an output of the periodic optical filter; a continuous output optical filter with an input coupled the light path to sample light that is supplied to or received from the sensing device; a second detector coupled to an output of the continuous output optical filter; a computation circuit coupled to the first and second detector, and configured to process output signals from the first and second detector obtained during a wavelength scan of light supplied through the light path, using quantization of data derived from the second detector to identify a plurality of wavelengths, each associated with one of a plurality of respective time points at which the wavelength scan reaches corresponding positions in respective periods of the periodic optical filter, and to compute a wavelength associated with the response of the sensing device from the identified wavelengths on the basis of a time point of the response of the sensing device and at least a wavelength associated with a nearest lower or upper time point, selected from said plurality of respective time points, wherein said nearest lower time point or said nearest upper time point represents, respectively, (i) a time before or equal to the time point of the response of the sensing device or (ii) a time after or equal to the time point of the response of the sensing device.