Product Announcement from Andover Corporation

Andover Corp Spectrophotometer Calibration Filters-Image

Spectrophotometer Calibration Filters

Andover Corporation offers two filter sets for verifying the transmittance and absobance scales of visible absorption spectrophotometers with maximum bandwidths of 2.2nm and 6.5nm. Each set contains 3 glass filters for the verification of transmittance and 1 clear holder for use as a balancing filter.

Made of uncoated Schott NG-4 and NG-5 glass, the filters are polished over the central 5mm x 20mm area to a transmitted wavefront of 1/4 wave or better at 522nm and parallelism of 30 arc seconds or better. The transmission value of each filter is measured on a spectophotometer calibrated with standards directly traceable to the National Institute of Standards and Technology (NIST).

The AC-930 calibration filter set consists of three absorption glass filters and one blank holder to be used as a balancing filter. The nominal transmittance values of these filters are 10%, 20%, and 30%.

The AC-1930 calibration filter set consists of three absorption glass filters and one blank holder to be used as a balancing filter. The nominal transmittance values of these filters are 1%, 3%, and 50%.

 
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