Multi-Ray Ablation Sensor Development Program.
Abstract
This report documents the design analyses and test results that were performed in the development of a Multi-Ray Ablation Sensor. The sensor was designed to measure nosetip ablation along nine individual rays with a single photon counting tube (Digicon tube). The sensor measures ablation by measuring the change in gamma-ray activity of radioactive sources located in the nosetip. Nine CsI scintillators convert the incident gamma-rays into photons (light) which are coupled to the photon counting tube with flexible fiber optic light guides. The light guides are positioned on the Digicon tube's photocathode so that the photoelectrons generated by light guide photons are electrostatically focused to a corresponding diode on the anode end of the tube. The nine light guide images on the photocathode are focused, one-to-one, on a corresponding array of diodes. The photoelectrons are accelerated and focused with -15 kV and an electrostatic lens. The signal outputs from the diodes are amplified and shaped for imput into conventional reentry vehicle telemetry interface electronics.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1977
- Accession Number
- ADA058366
Entities
People
- H. L. Moody