In response to the need for a more accurate means of gauging NVIS compatibility, Gamma Scientific has developed its all new GS-1290-NVIS series of NVIS Spectroradiometers.
While the MIL-SPEC and competitive systems targeted a 10:1 signal-to-noise (SNR) measurement ratio, these new instruments from Gamma Scientific are designed and built to deliver SNR of 100:1 or greater.
This increase in the performance level in the metrology system enables manufacturers to ensure that that their products are fully compliant with the MIL-SPEC, without the downside of unnecessarily failing good product.
GS 1290-NVIS spectroradiometers also employ a dual-stage, thermoelectric cooling system that stabilizes the CCD at a lower ambient temperature than competing systems based on single-stage cooling designs. In Gamma Scientific products, the CCD is cooled and stabilized to -15°C, whereas competitive products are typically only cooled down to -5° or -10°.
Because of the non-linear dependence of CCD noise on operating temperature, this apparently small temperature difference makes about an order of magnitude difference in the noise floor.
Gamma Scientific GS-1290-NVIS series products utilize the RadOMAcam, a telescope with a lens system which collects light from the DUT and focuses it into a fiber optic cable. A series of selectable apertures allow the sampling field of view to be varied from 3.2 mm down to as little as 72 um.
The smaller fields of view enable the instrument to measure extremely small spot sizes on the DUT. This might be used, for example, to measure just a single character, or even an individual stroke on a character, on a display.
Many suppliers of spectroradiometers for NVIS compatibility testing claim that their product is compliant with the current MIL-SPEC. But for certain types of lighting components, such as LCDs, accurately measuring NVIS radiance levels is a challenge.
Gamma Scientific solves these problems with their GS-1290 series of NVIS Spectroradiometers. These instruments far surpass the requirements of the MIL-SPEC, while still remaining cost competitive with other systems that don’t. The result enables manufacturers to ensure NVIS compatibility without driving up their own development and production costs needlessly.