US 12,332,123 B2
Temperature monitoring device, temperature monitoring method, and temperature monitoring system
Tomasz Nasilowski, Warsaw (PL); Marek Napierala, Warsaw (PL); Lukasz Szostkiewicz, Torun (PL); Alejandro Dominguez-Lopez, Granada (ES); Krzysztof Markiewicz, Warsaw (PL); Jakub Kaczorowski, Marki (PL); Mariusz Biela, Rakownia (PL); and Piotr Plaszczykowski, Osowiec (PL)
Assigned to INPHOTECH SP. Z O.O, Ołtarzew (PL)
Filed by INPHOTECH SP. Z O.O, Ołtarzew (PL)
Filed on Apr. 15, 2021, as Appl. No. 17/231,924.
Application 17/231,924 is a continuation of application No. PCT/IB2019/058859, filed on Oct. 17, 2019.
Claims priority of application No. 427454 (PL), filed on Oct. 18, 2018.
Prior Publication US 2021/0278289 A1, Sep. 9, 2021
Int. Cl. G01K 11/32 (2021.01); G01K 1/024 (2021.01); G01K 3/00 (2006.01); G07C 5/08 (2006.01)
CPC G01K 11/32 (2013.01) [G01K 1/024 (2013.01); G01K 3/005 (2013.01); G07C 5/0833 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A temperature monitoring device comprising:
a control system operable to generate a substantially periodic control waveform;
an ambient temperature sensor communicatively coupled to the control system operable to detect an ambient temperature;
a tunable wavelength light source with a control input coupled to an output of the control system;
an optical fiber interferometer with an input coupled to an output of the tunable wavelength light source;
an arm coupled to the optical fiber interferometer, the arm including a measuring optical fiber;
a detector with an input coupled to an output of the optical fiber interferometer;
an analogue to digital converter operably coupled to the detector; and
a signal processing module operably coupled to the detector via the analogue to digital converter, and operable to identify temperature changes along an optical fiber length of the measuring optical fiber and having an input coupled to an output of the detector, wherein the signal processing module is operable to determine a temperature based on the temperature changes and the ambient temperature and,
wherein:
a light source coherence length is longer than 0.5 m;
a period of the periodic control waveform is shorter than or equal to 20 s;
a wavelength tuning range of the tunable wavelength light source is higher than 3 μm; and
the measuring optical fiber is adapted to be placed in a proximity of at least one exoenergetic device in a running vehicle and is adapted to provide Rayleigh scattered signals to the interferometer.