Optical detector calibrator system

US5561290A · kind A · utility

Assignee

• The United States of America as represented by the Administrator of the National Aeronautics and Space Administration · US

Inventors

• James Strobel · Titusville, US
• John S. Moerk · Titusville, US
• Robert C. Youngquist · Cocoa, US

Key dates

• Filing date: Jun 9, 1995
• Grant date: Oct 1, 1996
• Expiry date: Jun 9, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G01J1/0448
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An optical detector calibrator system simulates a source of optical radiation to which a detector to be calibrated is responsive. A light source selected to emit radiation in a range of wavelengths corresponding to the spectral signature of the source is disposed within a housing containing a microprocessor for controlling the light source and other system elements. An adjustable iris and a multiple aperture filter wheel are provided for controlling the intensity of radiation emitted from the housing by the light source to adjust the simulated distance between the light source and the detector to be calibrated. The geared iris has an aperture whose size is adjustable by means of a first stepper motor controlled by the microprocessor. The multiple aperture filter wheel contains neutral density filters of different attenuation levels which are selectively positioned in the path of the emitted radiation by a second stepper motor that is also controlled by the microprocessor. An operator can select a number of detector tests including range, maximum and minimum sensitivity, and basic functionality. During the range test, the geared iris and filter wheel are repeatedly adjusted by the m…