Thermal optimization on micromachined convective accelerometer |
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Authors: | X B Luo Z X Li Z Y Guo Y J Yang |
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Institution: | (1) Department of Engineering Mechanics Tsinghua University, Beijing, 100084, China, CN;(2) Hebei Semiconductor Research Institute Shijiazhuang, 050051, China, CN |
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Abstract: | A kind of micromachined convective accelerometer without solid proof mass is numerically and experimentally studied in this
paper. The accelerometer consists of a micro heater and two temperature sensors which measure the temperature difference between
two symmetrical positions on both sides of the micro heater. The temperature difference is caused by free convection due to
acceleration. Thermal optimization on the accelerometer is conducted based on numerical simulation. Three important indexes
of the accelerometer, linearity, sensitivity and frequency response are discussed respectively. The results show that linearity
relates with the non-dimensional number Gr, only when Gr is in the range from 10−2 to 103, good linearity can be achieved. The optimum sensor position for high sensitivity and good linearity is near at x/D=0.3. An increase of heating power or cavity size leads to an increase in the sensitivity. The working media that has small
density ρ and large thermal diffusivity α is favorable for fast frequency response, the one having large density ρ and small
kinematic viscosity υ will be advantageous for high sensitivity. Experimental tests prove that the optimized convective accelerometer
has good linearity, high sensitivity and preferable frequency response.
Received on 9 March 2001 / Published online: 29 November 2001 |
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