Fluerics 40: LJARS, The Laminar Jet Angular Rate Sensor.
HARRY DIAMOND LABS ADELPHI MD
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This report presents an analysis and experimental data in its support for a laminar jet angular rate sensor LJARS. An LJARS is a device in which a Coriolis force causes a jet to deflect as a function of applied angular rate. This jet deflection is sensed as a differential pressure or flow. Both the theory and the data show that the differential pressure is a linear function of applied angular rate. The report considers the fluid mechanic and fluid dynamic aspects of the device and discusses in detail such areas as jet pressure recovery, dynamic response, and transport delay. In addition, the report expands considerably on the theory by presenting numerous empirical guidelines for the design and the implementation of these devices. Included is a brief heuristic argument for the determination of the transition-to-turbulence point and methods for effecting suitable temperature and null offset compensation. Environmental temperature and pressure effects are detailed. Finally, typical LJARS characteristics are summarized and presented. The important characteristic parameters are thresholds of less than 0.1 degs, offsets of less than 0.5 degs, and sensitivities of 0.04 Padegs. The LJARS output is easily amplified by laminar proportional amplifiers. Other desirable characteristics of the LJARS are an estimated cost of less than 100, high reliability, and instant-on performance. Author
- Fluidics and Fluerics