urn:nasa:pds:context:instrument:multi-host.generic_gaas_hsp 1.0 1.14.0.0 Product_Context 2020-09-24 1.0 Initial submission Generic GaAs High Speed Photometer Photometer This is a generic high speed photometer which uses gallium arsenide (GaAs) as a detector. GaAs which is a direct band gap semiconductor, is sensitive to the intensity of infrared light. The nominal operating wavelength range is 865nm to 895nm. A large number of these were produced by several manufacturers and were in wide use in the last few decades of the 20th century.