PIEZOELECTRIC CHARGER CD V-751X.
Abstract
The design, development and fabrication of a radiological dosimeter charger, which uses piezoelectric ceramic crystals to generate the electrical energy and a lens system for external ambient light only, is described. This charger, presently designated OCD No. CD V-751X, has been developed as a possible replacement for the transistorized charger, OCD Item No. CD V-750, but requires no batteries; therefore, it has long shelf life. The effects of static stress on the piezoelectric properties of different ceramic materials were studied and basic formulas derived. Studies showed that the charge generated by the application of force to the piezoelectric material was directly pro portional to force and to the material constant but was not dependent on the size. The material ''constants'' varied with stress, however, particularly at high stress values, so the size and shape affects the charge output indirectly. The charger is capable of using either natural sunlight or concentrated sources of light such as room light fixtures, flashlights or candles. All performance and environmental test require ments were passed on the prototype chargers except that for humidity. Modifications to the prototypes are suggested which should correct this humidity problem. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 09, 1963
- Accession Number
- AD0412337
Entities
People
- John Stirnkorb
- R. Lehman