Radiometric Calibration Methodology for Near-Infrared Instrumentation

摘要

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