US 12,241,880 B2
Method of controlling heater systems
Christoph Glacer, Munich (DE); Guillaume Dumas, Munich (DE); and Johannes Manz, Munich (DE)
Assigned to Infineon Technologies AG, Neubiberg (DE)
Filed by Infineon Technologies AG, Neubiberg (DE)
Filed on Oct. 12, 2021, as Appl. No. 17/499,285.
Claims priority of application No. 20204685 (EP), filed on Oct. 29, 2020.
Prior Publication US 2022/0137016 A1, May 5, 2022
Int. Cl. G01N 33/00 (2006.01); G01N 21/17 (2006.01); G01N 21/3504 (2014.01); G01N 21/3577 (2014.01); G01N 29/02 (2006.01); G01N 29/24 (2006.01)
CPC G01N 33/0016 (2013.01) [G01N 21/3504 (2013.01); G01N 21/3577 (2013.01); G01N 29/02 (2013.01); G01N 29/2418 (2013.01); G01N 33/0062 (2013.01); G01N 33/0073 (2013.01); G01N 2021/1704 (2013.01); G01N 2291/02809 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An emitter comprising:
a Joule-heated emitting electrical conductor configured to emit radiation at a specific wavelength;
a controller configured to control a variable voltage applied to the Joule-heated emitting electrical conductor and modulated according to a duty cycle, the duty cycle being variable between:
a high-average power duty cycle, during hot periods, so that the Joule-heated emitting electrical conductor is subjected to a high-average power in order to reach and maintain an emission temperature so that the Joule-heated emitting electrical conductor emits the radiation at the specific wavelength; and
a low-average power duty cycle, during cold periods alternated to the hot periods, so that the Joule-heated emitting electrical conductor is subjected to a low-average power in order to reach a temperature that is smaller than the emission temperature so that the Joule-heated emitting electrical conductor does not emit the radiation at the specific wavelength, wherein the low-average power duty cycle is smaller than the high-average power duty cycle; and
a temperature sensor configured to obtain at least one temperature-indicative measured value indicative of an ambient temperature,
wherein the high-average power duty cycle and the low-average power duty cycle are defined based on the at least one temperature-indicative measured value, and
wherein the specific wavelength is a characteristic wavelength of a particular fluid.