Interference Filters and Coatings for Mid-Infrared Astronomy (8-30μm)
Proceedings of SPIE SPIE, the international society for optics and photonics 4842 (2003) 43-55
Infrared filters and coatings for the High Resolution Dynamics Limb Sounder (6-18 microm).
Applied optics 39:28 (2000) 5221-5230
Abstract:
We describe the spectral design and manufacture of the narrow-bandpass filters and 6-18-microm broadband antireflection coatings for the 21-channel High Resolution Dynamics Limb Sounder. A method of combining the measured spectral characteristics of each filter and antireflection coating, together with the spectral response of the other optical elements in the instrument, to obtain a predicted system throughput response is presented. The design methods that are used to define the filter and coating spectral requirements, choice of filter materials, multilayer designs, and deposition techniques are discussed.A spectral performance model for the High Resolution Dynamics Limb Sounder (6–18 μm)
Infrared Physics & Technology Elsevier BV 41:4 (2000) 239-246
Abstract:
A spectral performance model, designed to simulate the system spectral throughput for each of the 21 channels in the HIRDLS radiometer, is described. This model uses the measured spectral characteristics of each of the components in the optical train, appropriately corrected for their optical environment, to determine the end-to-end spectral throughput profile for each channel. This profile is then combined with the predicted thermal emission from the atmosphere, arising from the height of interest, to establish an in-band (wanted) to out-of-band (unwanted) radiance ratio. The results from the use of the model demonstrate that the instrument level radiometric requirements for the instrument will be achieved. The optical arrangement and spectral design requirements for filtering in the HIRDLS instrument are described together with a presentation of the performance achieved for the complete set of manufactured filters. Compliance of the predicted passband throughput model to the spectral positioning requirements of the instrument is also demonstrated.Manufacture and spectral assessment of the filters and antireflection coatings for use in the HIRDLS instrument
Infrared Spaceborne Remote Sensing VI SPIE (1998)
Abstract:
This paper describes the design and manufacture of the filters and antireflection coatings used in the HIRDLS instrument. The multilayer design of the filters and coatings, choice of layer materials, and the deposition techniques adopted to ensure adequate layer thickness control is discussed. The spectral assessment of the filters and coatings is carried out using a FTIR spectrometer; some measurement results are presented together with discussion of measurement accuracy and the identification and avoidance of measurement artefacts. The post-deposition processing of the filters by sawing to size, writing of an identification code onto the coatings and the environmental testing of the finished filters are also described.Spectral design and verification of HIRDLS filters and antireflection coatings using an integrated system performance approach
Infrared Spaceborne Remote Sensing VI SPIE (1998)