Abstract: An angular rate of change sensing device of the type wherein angular rate of change, movement, or velocity is indicated by sensing a differential fluid velocity relative to a sensing apparatus in an underdeveloped laminar fluid flow field and is characterized primarily in that under conditions of no angular movement, there exists a constant or flat fluid velocity and density profile in a plane normal to the longitudinal axis of the flow channel. The device consists of a fluid flow inlet conditioner, a contoured inlet nozzle, a straight or slightly diffusing flow channel, a flow sensing apparatus inside the channel, and a device for pumping fluid through the flow conditioner and channel. Under conditions of angular rotation the velocity profile of a constant velocity, laminar fluid flow field relative to a sensing apparatus, is distorted due to fluid dynamic inertial effects and due to the effects of a relative velocity differential between sensing elements.

Abstract: An angular acceleration sensing device which operates on a principle whereby the relative motion of a volume of gas or fluid contained within an annular ring or torroid is sensed when the container is subjected to an angular acceleration about an axis perpendicular to the plane of the fluid ring. The apparatus includes an enclosed circular fluid-filled channel which can be an annular ring or torroid; thermally sensitive elements suspended within the fluid channel and an electronic circuit providing power to the sensing elements and output voltages.