Abstract
A novel method for flame radiant heat flux measurement based on bi-material micro-cantilever is developed. The theoretical analysis and optimization of the bi-material micro-cantilever, such as its shape, size and thickness ratio are discussed. The relationship between the thermal radiation and the deflection of the micro-cantilever is determined by the calibration tests with a standard blackbody. Radiant heat flux of practical flame is measured with this method and compared with the Captec total radiant flux sensor (Captec TS-30, France). The results show that the bi-material micro-cantilever made of silicon nitride and aluminum achieves its biggest sensitive coefficient when the thickness ratio is 3/2, and the suitable temperature rising scope of a commercially available triangular micro-cantilever is determined experimentally. The 200 μm bi-material micro-cantilever has higher sensitivity and stability when the radiant heat flux within the range of 450 W/m2 < q < 2300 W/m2.
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