Abstract: A mass rate of flow meter with a first magnet and a sensing coil assembly for detecting the passage of an unrestrained rotor past the sensing coil assembly. The sensing coil assembly includes a coil wound on a copper coil form that provides phase shifts to start signals from the sensing coil assembly at low speeds to compensate phase shifts that are produced in a second coil assembly that generates stop pulses.

Abstract: A densitometer of the vibrator type is disclosed wherein a spring mass system is immersed in a liquid whose density is to be determined. The system includes a pair of coaxial cylindrical masses in the form of fluid couplers having spaces which are open to the liquid. A torsion spring connects both cylindrical masses through mechanically stiff coupling means. The coupling means include a pair of high impedance transducers positioned at the shear interfaces normal to the common axis of the system, so as to take substantially the full torsional shear load between the spring and the cylindrical fluid couplers without contributing to the spring effect. The compliance of the torsion spring allows oscillatory motion of the spring mass system around its axis. An output signal having a high signal-to-noise ratio is provided at the natural resonant system frequency.

Abstract: An improved cylindrical conduit for directing fluid flow to the swirl generator of an angular momentum type rate of flow meter commonly employed in measuring fuel flow rate in aircraft engines. The conduit includes a first set of longitudinally extending, resilient fingers and a second set of concentric sealing fingers that seal the resilient fingers in the first set. At low flow rates, the sealing fingers prevent leakage between the resilient fingers and the conduit directs substantially all fluid to the swirl generator.

Abstract: A mass rate of flow meter with a first magnet and sensing coil for detecting the passage of an unrestrained rotor past the sensing coil. The position of a restrained turbine reactor is sensed by locating an axially extending magnetic flux linkage near the periphery of the turbine with an extension that is disposed in an axially overlapping relationship with a magnet that extends from the periphery of the rotor. A flux collecting ring on the periphery of the turbine is coupled to the magnetic flux linkage to provide a low reluctance magnetic circuit that couples flux from the first magnet to the sensing coil.

Abstract: A compact, highly efficient, integral construction for a speed sensor is described which, in a preferred embodiment, utilizes a cup shaped magnetically soft body or housing as an integral core, sheath and flux return path for a rare earth permanent magnet. A reentrant center post is positioned within the cup shaped sensor housing and a thin disc shaped, rare earth permanent magnet is secured to the free end of the center post. The magnet is thus positioned directly adjacent to a rotating toothed gear, the speed of which is to be sensed but is shielded magnetically from extraneous magnetic effects because it is positioned in the housing. As the toothed wheel rotates past the magnet, the reluctance of the magnetic path varies with the varying air gap. The flux level generated by the thin magnet varies correspondingly and an AC signal is generated in a coil mounted on the center post.

Abstract: An electrical setback generator for ammunition fuses is provided which has a core which extracts energy from a magnetic field through a reverse saturation cycle.