Equipment for Radio Transmission of Electrical Strain Gauge Data
Abstract
The object of this problem was to design and construct two transmitters for transmitting the vibration pick-up voltage from airplane to ground and to design receiving equipment to receive the transmitted vibration pick-up on the ground, for study on a string oscillograph. The system described in these tests is a complex system, and the results indicate that the possibility of errors entering into the results is very great unless extreme care is used in operation. The fact that very small voltages are generated by the pick-up strips requires high amplification in the modulators, thereby increasing the difficulties in the amplifying circuits such as tube microphonics which show up in the receiver output as complex vibrations. The system requires battery leads to the pick-up strip, which may cause feed-back into the system and may cause loading of the point to be measured. It is recommended that the equipment be tested for comparison with present systems at the Naval Aircraft Factory, Philadelphia.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 25, 1939
- Accession Number
- AD1158910
Entities
People
- G. C. Schleter
Organizations
- United States Naval Research Laboratory