Patent ID: 8453501

Claim:
A heat conduction type barometric sensor comprising a thin film thermally separated from a substrate, the thin film having at least one thin-film temperature sensor, a heating means for heating the thin film, and a excitation means that vibrates the thin film, the heat conduction type barometric sensor characterized in that the thin film consists of two or more thin-layers that have at least different expansion coefficients, the excitation means utilizes warpage and bending based on a difference in thermal expansions between two main layers constituting the thin film during intermittent heating by the heating means, and based on the warpage and bending, either the temperature difference generated by forced convection generated when the thin film starts vibrating when the heating means starts to heat the thin film, or the temperature difference generated by forced convection using vibration caused in the process of cooling when the heating means stopped heating the thin film, is measured, and a heat transmission from the heated thin film to an ambient gas is facilitated so that temperature change of the thin-film temperature sensor is increased, and the increased temperature change enhances measuring sensitivity to barometric pressure to be measured.