NICS - IR-ENG Filters

The methane filters were manufactured by IR-Eng for the consortium of astronomers headed by Alan Tokunaga. They are mounted inside NICS un-tilted. Their transmission was measured directly inside the instrument by taking a series of spectra of a halogen lamp without and with the filter inserted before the AMICI, JH, and HK dispersers.
The resulting transmission curves, measured at a temperature of about 78 K, are available in the following ASCII files.

For any comments please contact Francesca Ghinassi.