US 12,235,140 B2
Technique for spatially resolving temperature and strain measurements via brillouin scattering
Wieland Hill, Odenthal (DE); Alexander Rath, Hürtgenwald (DE); Benjamin Marx, Cologne (DE); and Thorben Jostmeier, Haan (DE)
Assigned to NKT Photonics GmbH, Cologne (DE)
Filed by NKT Photonics GmbH, Cologne (DE)
Filed on Nov. 24, 2021, as Appl. No. 17/535,043.
Claims priority of application No. 102020132210.0 (DE), filed on Dec. 3, 2020.
Prior Publication US 2022/0178724 A1, Jun. 9, 2022
Int. Cl. G01D 5/353 (2006.01); G01K 11/322 (2021.01); G01L 1/24 (2006.01)
CPC G01D 5/35364 (2013.01) [G01K 11/322 (2021.01); G01L 1/242 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An apparatus for digitizing an optical signal, comprising:
an optical detector to detect an optical signal and to generate an electric signal corresponding to the optical signal;
an envelope curve detector to determine the amplitude of the electric signal or a modified electric signal resulting from the electric signal, and to supply an amplitude signal corresponding to the amplitude;
an analog to digital converter to digitize the amplitude signal and to supply a corresponding digitized amplitude signal; and
a variable voltage source to generate a variable voltage signal to calibrate the envelope curve detector, wherein the variable voltage signal has the same or a similar frequency as the electric signal generated from the optical signal.