Abstract: Provided is a piezoelectric vibration type force sensor including a vibration body including a disk-shaped piezoelectric material and a pair of drive electrodes, for vibrating in a radial direction of the piezoelectric material when an AC voltage is applied to the pair of drive electrodes, a substrate to be brought into contact with a surface on one side of the vibration body, an elastic member that is disposed to be brought into contact with a surface on another side of the vibration body, and a holding member including a contact portion and a loose-fit portion that loosely fits in the hollow through hole. The holding member fixes the contact portion and the loose-fit portion to the substrate so that movements of the vibration body in a vibration direction and in a direction orthogonal to the vibration direction are restricted for positioning.

Abstract: Vibrating structure gyrometer with at least one tuning fork, produced by micro-machining from a thin plate, the said tuning fork comprising a pair of mobile inertial assemblies (EIM1, EIM2) linked by a coupling assembly (1). A tuning fork comprises two controlled electrodes (9, 9?) for equilibration of the sense resonator and electrostatic adjustment of the frequency of the sense resonator along the sense axis y which are respectively associated with the two mobile inertial assemblies (EIM1, EIM2) of the said tuning fork, and control means (UCE) adapted for applying two respective continuous electrical voltages V1 and V2 to the said two electrodes (9, 9?) simultaneously satisfying the relations: V 1 2 + V 1 2 = 2 ? ( f y ? ? _ ? ? initial - f y ? ? _ ? ? final ) ? f and V 1 2 - V 2 2 = c y ? ? _ ? ? initial a ? ? ? f .

Abstract: A flow measurement in a conduit is combined with a thermal flow measurement made in a bypass channel to provide an increased range of flows over which an accurate measurement can be made. The thermal flow sensor in this combination is responsive only to a modulated component of the flow and thus provides a means of calibrating the zero of the composite instrument.