Temperature-compensated fiber-optic gas flow speed sensor based on the ‘Hot-wire’ principle

Compared with the use of other types sensors, there are significant advantages in making measurements low speed gas flows by using a fiber-optic ‘hot-wire’ sensor. Measurements this type intrinsically safe fiber optic technology play an important role industry, especially coal mine clearance, roadway ventilation and fire safety warning. However, ‘line-diameter ratio’ wind sensor described previous work is far smaller than that for traditional electronic hot-wire requires investigation optimization. To do necessitates considering combined influence factors such as forced convection, natural radiation heat transfer conduction on operation probe, between element base, when analyzing performance flow modelling its characteristics. Based results model created, paper presents method to improve indeed further enhance sensor, having focus proportion convective total energy dissipation under different ambient conditions, well temperatures probe. The numerical simulation experimental verification carried out show measurement error was less ±0.2 m/s, used within range 0−6 m/s. situations before compensation applied, reduced significantly improved.