Correction:Highly Sensitive Hydrogen Sensing Based on Tunable Diode Laser Absorption Spectroscopy with a 2.1 μm Diode Laser(Chemosensors, (2022), 10, (321), 10.3390/chemosensors10080321)

Missing Citation and Citation Revision In the original publication [1], Avetisov, V.; Bjoroey, O.; Wang, J.; Geiser, P.; Paulsen, K.G. Hydrogen sensor based on tunable diode laser absorption spectroscopy. Sensors 2019, 19, 5313. was not cited. The citation has now been inserted in the third paragraph of 1. Introduction as Ref. [41] and a sentence is added for this new citation In the year of 2019, a TDLAS based H₂ sensing was performed, and a precision of 0.02 %v was achieved with 1 m of absorption pathlength and 1 s of integration time. Therefore, the third paragraph is modified as: . . . . . . The TDLAS technique is widely applied in the detection of various kinds of gases [38,39,40] because of the advantages of non-contact measurement, in situ detection, high selectivity, quick response, low cost, and multicomponent, multi-parameter measurement. In the year of 2019, a TDLAS based H2 sensing was performed, and a precision of 0.02 %v was achieved with 1mof absorption pathlength and 1 s of integration time [41]. Furthermore, some revisions for the reference in this third paragraph have also been made for a more precise citation. The original Refs. [23,24,28,30,35,36] are replaced by the new one. The original Ref. [41] is deleted. In the Section 2.4. the first paragraph of 2.4 The Selection of Multipass Gas Cell, the citation is modified due to the above revisions. The original is The line strength of the strongest absorption line of H2 (10^-26) is still much weaker than other gases (~10^-21) [38–41]. The revised is The line strength of the strongest absorption line of H2 (10^-26) is still much weaker than other gases (~10^-21) [38–40].