MORSE .srf File

30JUN25
Description
Spectral Response Function (SRF) for a single filter channel sampled on a uniform spectral grid.

Filename(s)
Specified in the *SRF section of the driver table.

Structure
The SRF file consists of a record-structured header section, containing two non-comment records, followed by a data section containing the list of SRF values read as a single block of numbers.

It is similar to the structure of the .ils file, with the addition of the FILTER_ID and WNOM fields.

Header Section
!CMNT Comment record(s) (optional)
FILTER_ID Filter identifier, left justified, up to 8 characters
!CMNT Comment record(s) (optional)
NWNO   WMIN   WDEL   WMAX   WNOM Wavenumber axis parameters, single record
Data Section
SRF(1) SRF(2) ... Data section containing as many records as required
... SRF(NWNO)

Fields
Field Type Description Units Range
!CMNT C80 Comment records, starting with '!'
FILTER_ID C8 HSDI Channel Identifier, eg 'HSDI_01'
NWNO I No. data points ≥ 3
SRF(NWNO) R Tabulated Spectral Response Function [1]
WDEL R Wavenumber increment cm-1 > 0
WMAX R Upper Wavenumber limit cm-1 > WMIN
WMIN R Lower Wavenumber limit cm-1 0 ≤ : < WMAX
WNOM R Nominal Channel Wavenumber [2] cm-1 WMIN ≤ : ≤ WMAX
Type: I=Integer; R=Real; Cn=character string, max length n.
Notes
  1. Wavenumber of tabulated SRF at point i given by: Wno(i) = WMIN + ( i - 1 ) × WDEL

  2. Nominal wavenumber WNOM is, in principle, the weighted average of the SRF but is only included as a convenient means of referring to the channel.