Quartz resonator fluid monitors for vehicle applications
Abstract
Thickness shear mode (TSM) quartz resonators operating in a new 'Lever oscillator' circuit are used as monitors for critical automotive fluids. These monitors respond to the density and viscosity of liquids contacting the quartz surface. Sensors have been developed for determining the viscosity characteristics of engine lubricating oil, the state-of-charge of lead-acid storage batteries, and the concentration variations in engine coolant.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- 1994
- Bibcode:
- 1994STIN...9521546C
- Keywords:
-
- Circuits;
- Density (Mass/Volume);
- Fluids;
- Lubrication Systems;
- Mechanical Oscillators;
- Monitors;
- Quartz;
- Resonators;
- Viscosity;
- Automobile Engines;
- Engine Coolants;
- Lead Acid Batteries;
- Lubricating Oils;
- Mathematical Models;
- Thickness Ratio;
- Instrumentation and Photography