[2] [2] Muller M, Graf P, Meyer J, et al. Integration and calibration of non-dispersive infrared (NDIR) CO2 low-cost sensors and their operation in a sensor network covering Switzerland[J]. Atmospheric Measurement Techniques, 2020, 13(7): 3815-3834.

[3] [3] Dinh T V, Lee J Y, Ahn J W, et al. Development of a wide-range non-dispersive infrared analyzer for the continuous measurement of CO2 in indoor environments[J]. Atmosphere, 2020, 11(10): 1024.

[6] [6] GENG H, LIU J G, ZHANG Y J, et al. Ethanol vapor measurement based on tunable diode laser absorption spectroscopy[J]. Acta Physica Sinica, 2014, 63(4): 043301.

[7] [7] GAO H, XIE L, GONG P, et al. Detection of ethanol using a tunable interband cascade laser at 3.345 ?m[J]. Photonic Sensors, 2018(8): 303-309.

[11] [11] Mikuta R, Silinskas M, Bourouis R, et al. Characterization of nondispersive infrared gas detection system for multi gas applications[J]. Technisches Messen, 2016, 83(7-8): 410-416.

[12] [12] WU Y Z, SHI Z H. The design of the test chamber that offers environmental conditions to detect non-dispersive infrared gas concentration[J]. Applied Mechanics and Materials, 2014(602-605): 2285-2289.