10 September 2001 IR sensor performance testing with a double-slit method
Author Affiliations +
Abstract
Determination of the performance of undersampled IR cameras by means of four-bar patterns suffers from aliasing for spatial frequencies above the Nyquist limit. An alternative method, using two parallel line sources, is described. This method avoids the aliasing effect and allows a reproducible way for performance measurements by simple variation of the spacing between the two line sources and their temperatures. The modulation depth at optimum phase is measured in the camera display or electronics, similar to the classical Rayleigh criterion. Additional benefits of the new method are the simple target construction (only one target is required) and the ease to model line sources. The result of a performance measurement is similar to the standard MRTD (Minimum Resolvable Temperature Difference) method, where sensor resolution is coupled to range for a given target size and contrast. The new method has therefore the potential to be implemented into the present STANAG4347 and 4349. Results of performance measurements, carried out with the uncooled Thermacam PM395 camera and other cameras, are shown. Predicted and measured performance agree very well.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Arie N. de Jong, Arie N. de Jong, Hans Winkel, Hans Winkel, Rick I. Ghauharali, Rick I. Ghauharali, } "IR sensor performance testing with a double-slit method", Proc. SPIE 4372, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XII, (10 September 2001); doi: 10.1117/12.439141; https://doi.org/10.1117/12.439141
PROCEEDINGS
11 PAGES


SHARE
RELATED CONTENT

Miniature high-resolution laser radar operating at video rates
Proceedings of SPIE (September 04 2000)
Carrier-Based Automatic Phase-Shift Method
Proceedings of SPIE (December 19 1989)
Effects of phasing on MRT target visibility
Proceedings of SPIE (August 31 1991)
Phase-Locked Interferometry
Proceedings of SPIE (November 20 1977)

Back to Top