Radiometric Calibration Methodology for Near-Infrared Instrumentation
Abstract
This document describes the selection of a laboratory-based, spectroradiometric standard to provide for the calibration of the near-infrared instrumentation of the Remote Sensing Department of the Space Sciences Application Laboratory. The goal is to provide a source whose spectral emittance is known to better than 1% over the entire near-infrared spectral region (0.8-2.5 mironm) and which can be calibrated directly at the National Institute of Standards (NIST). The source selected is a freeze-point cavity blackbody that uses a copper melt with a temperature of 1084.62C and provides an on-axis effective emissivity of > 0.999. The nominal temperature uncertainty provided by the vendor is +/-O.5C, sufficient to meet our specification. However, through the calibration (and certification) by NIST, the intent is to reduce this value to <O.15C with respect to the Nation's primary radiometric standard. Acquisition of a transfer radiometer will make it possible to extend the calibration to other cavity and variable-temperature blackbodies resident in the department. The freeze-point has the spectral coverage to provide accurate spectroradiometric calibrations in the optical, mid-wave, and longwave infrared spectral regions as well as the near-IR.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 20, 2002
- Accession Number
- ADA406925
Entities
People
- R. J. Rudy
Organizations
- The Aerospace Corporation