C FTS S/N Curves: InSb Detectors

The following figures give achievable S/N ratios (where N is r.m.s. noise) in one hour integrations when observing with an intermediate modulation frequency of 143 Hz. The S/N for different resolutions is proportional to .

Note that under detector noise limited conditions (appropriate where the slope of the lines in the figures is 1) the S/N is improved by a factor of approximately two when a modulation frequency of 20 Hz is used.

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