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  1. Filter Transmission Characteristics Filter1 Filter2 Peak value ½ Peak value fwhm1 fwhm2

  2. Filter Test Setup Filter under Test Broadband Light Source Scanning Calibrated Detector

  3. UV IR IR UV Filter Test Setup Test Filter output Broadband Light Source Scanning Calibrated Detector Output Display Filter under Test

  4. Scanning Calibrated Detector Tunable narrowband prefilter Incident Light from Filter under test Broadband Detector Passband of Tunable Narrowband Prefilter Center wavelength tuner Sweeps UV IR

  5. Tunable Narrowband Prefilter Resolution Bandwidth Resolution Bandwidth input UV IR Sampled waveform At discrete wavelengths

  6. Narrow Resolution Bandwidth faithfully reproduces passband

  7. Wide Resolution Bandwidth underreports passband

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