SGP/NIMFR/E13 - NIMFR Centrovision filter leakage

Testing of the batch of centrovision filters being used in the NIMFR EF13
instrument indicate that the first four filters leak 'out of band' light. The
leakage for each filter is (1)415nm 3%, (2)500nm 1-2%, (3)615nm 1-2%, (4)673nm
3%. Acceptable leakage is less than 0.5%.

This leakage causes an error in the irradiance values (too high) at these four
wavelengths and the optical depths calculated using this data will be too high.

• Direct Normal Narrowband Irradiance, Filter 1(direct_norm_narrowband_filter1)
• Direct Normal Narrowband Irradiance, Filter 3(direct_norm_narrowband_filter3)
• Direct Normal Narrowband Irradiance, Filter 2(direct_norm_narrowband_filter2)
• Direct Normal Narrowband Irradiance, Filter 4(direct_norm_narrowband_filter4)

• Direct Normal Narrowband Irradiance, Filter 4(direct_norm_narrowband_filter4)
• Direct Normal Narrowband Irradiance, Filter 1(direct_norm_narrowband_filter1)
• Direct Normal Narrowband Irradiance, Filter 2(direct_norm_narrowband_filter2)
• Direct Normal Narrowband Irradiance, Filter 3(direct_norm_narrowband_filter3)

SGP/NIMFR/E13 - Centrovision filter leakage

Testing of the batch of centrovision filters being used in the NIMFR EF13
instrument indicate that the first four filters leak 'out of band' light. The
leakage for each filter is (1)415nm 3%, (2)500nm 1-2%, (3)615nm 1-2%, (4)673nm
3%. Acceptable leakage is less than 0.5%.

This leakage causes an error in the irradiance values (too high) at these four
wavelengths and the optical depths calculated using this data will be too high

• Direct Normal Narrowband Irradiance, Filter 2(direct_norm_narrowband_filter2)
• Direct Normal Narrowband Irradiance, Filter 4(direct_norm_narrowband_filter4)
• Direct Normal Narrowband Irradiance, Filter 1(direct_norm_narrowband_filter1)
• Direct Normal Narrowband Irradiance, Filter 3(direct_norm_narrowband_filter3)