Optimized Pyroelectric Vidicon Thermal Imager. Volume I. Thermal Imager. Volume 1a. Rain Camera. Volume 1b. Reticulation.
Abstract
A technique for suppressing the noise resulting from pedestal generation in the pyroelectric vidicon has been developed. System modifications were implemented to provide reduced bandwidth and line rates in order to effect a factor of four bandwidth reduction. Under these conditions, the pedestal noise is completely dominant. Implementation of the pedestal noise suppression technique then results in a factor between three and four improvement in the MRT's. Performance of the chopped-mode system is close to the best performance reported for the pan mode. Reticulation of the TGS family of pyroelectric targets was demonstrated using standard ion-milling techniques. Reticulation of DTGFB was successfully demonstrated by reactive ion milling using aluminum as a mask. The optimum depth achieved in the latter case was 18-20 micrometers, which translates into an aspect ratio of about 4:1. Both reticulated DTGS and DTGFB target were successfully constructed wherein individual dice were completely isolated from neighboring dice such that thermal spread was minimized. Several PEVs with reticulated targets were evaluated which indicate significant improvement in performance of DTGS targets and some modest improvement of DTGFB targets over single crystal targets. The optimum effect of reticulation at high spatial frequencies has been realized with DTGS targets but not yet with DTGFB targets.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1979
- Accession Number
- ADA092565
Entities
People
- Barry Singer
- E. Stupp
- Peter Murau
- Richard Kurczewski