Single-heat-source cross-flow type micro-mechanical biaxial thin-film gyroscope

Abstract

The invention discloses a single-heat-source cross-flow type micro-mechanical biaxial thin-film gyroscope which comprises a sensitive layer and a cover plate, two pairs of heaters and two pairs of thermistors which are of a cross-shaped structure are arranged on the upper surface of the sensitive layer, and a cross-shaped groove is etched in the lower surface of the sensitive layer; one heater andone thermistor form a measuring unit; the electrifying mode of the four heaters is periodic square wave type electrifying; and a groove is etched on the cover plate and is hermetically connected withthe upper surface of the sensitive layer. According to the MEMS gyroscope based on the thermal expansion flow, convection type oscillation heat flow distributed in a cross shape is formed, and a rectangular isolation resistor is arranged at the tail end of the heat flow. The cross-flow type gyroscope is high in heat flow velocity, stable in air flow state, high in sensitivity, good in stability,capable of achieving simultaneous measurement of the spatial biaxial angular velocity, high in integration degree, small in size, low in power consumption and low in cost.

Description

technical field [0001] The invention relates to the technical field of using Coriolis force to deflect a heat flow sensitive body to detect angular velocity and attitude parameters of a moving body, in particular to a single heat source cross-flow micromechanical biaxial film gyroscope. Background technique [0002] The miniature inertial sensor made by MEMS (Micro-Electro-Mechanical-System) technology has many advantages such as mass production, low cost, small size, and low power consumption. It is an ideal product for medium and low-precision miniature inertial sensors in the future. . Gyroscopes and accelerometers are the core inertial sensors for the measurement and control of carrier motion attitude, and gyroscopes are sensors that are sensitive to angular parameters such as angular velocity and angular acceleration. The traditional miniature gyroscope (micromechanical gyroscope) is based on the Coriolis effect principle that exists when the high-frequency vibrating m...

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Problems solved by technology

Chinese patent: A miniature four-channel circulating flow dual-axis silicon jet gyroscope (patent application number: 201510385582.4), which belongs to the miniature jet gyroscope. The piezoelectric film in the sensitive element increases the processing difficulty and cost, and the premise of maintaining the flow rate It is difficult to further reduce its volume

In Chinese patents 201410140298.6 and 201210130318.2, the main components in the sensor sensitive element-heater and thermistor both adopt a suspended cantilever beam structure. Since the heater and thermistor are suspended above the cavity, after the cavity is etched to release the structure, Stress will cause the heater and thermistor to deform or even break, resulting in low yield, and warping deformation will produce an asymmetric gas flow field without angular velocity input, resulting in angular velocity detection errors

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