urn:nasa:pds:vl_image_raw:calib:photosen 1.0 1.21.0.0 Product_Ancillary 2024-05-13 1.0 Initial version. 1976-07-20Z 1982-11-05Z Viking Mission urn:nasa:pds:context:investigation:mission.viking ancillary_to_investigation Viking Lander 1 Host urn:nasa:pds:context:instrument_host:spacecraft.vl1 is_instrument_host Camera 1 for VL1 Instrument urn:nasa:pds:context:instrument:cam1.vl1 is_instrument Camera 2 for VL1 Instrument urn:nasa:pds:context:instrument:cam2.vl1 is_instrument Viking Lander 2 Host urn:nasa:pds:context:instrument_host:spacecraft.vl2 is_instrument_host Camera 1 for VL2 Instrument urn:nasa:pds:context:instrument:cam1.vl2 is_instrument Camera 2 for VL2 Instrument urn:nasa:pds:context:instrument:cam2.vl2 is_instrument photosen.tab 1997-07-01 0 44 This table contains data for the photosensor characteristics needed for radiometric calibration of the Viking Lander cameras. Data for all four flight cameras are tabulated in this file. The data are taken from Huck et al., Radiometric Performance of the Viking Mars Lander Cameras, NASA TM X-72692, 1975. Carriage-Return Line-Feed 11 0 72 lander_number 1 1 ASCII_Integer 2 The Viking Lander number, either 1 or 2. camera_number 2 4 ASCII_Integer 2 The camera number on one of the Viking Landers, either 1 or 2. diode_name 3 8 ASCII_String 6 The commonly used name for a Viking Lander camera photodiode. calibration_factor 4 16 ASCII_Real 5 A factor to account for the differences between the camera model and calibration test hardware and the actual calibration test results. preamplifier_feedback_resistance 5 22 ASCII_Real 7 MegaOhms The resistance of the preamplifier feedback resistor for a given photodiode. channel_gain 6 30 ASCII_Real 6 The ratio of summing amplifier feedback resistance to the input resistance for a given photodiode (channel). aperture_radius 7 37 ASCII_Real 6 micrometers The radius for the aperture of a given photodiode. instantaneous_field_of_view 8 44 ASCII_Real 9 degree The angular size of the photodiode field of view. lens_diameter 9 54 ASCII_Real 5 cm The diameter of the lens in front of the photosensor array. lens_focal_length 10 60 ASCII_Real 5 cm The focal length of the lens in front of the photosensor array. in_focus_distance 11 66 ASCII_Real 5 meters The distance from the camera that an object is in focus. This distance is a function of the focal length of the camera lens and the distance between the lens and a given photodiode. photosen.lbl 0 PDS3 Carriage-Return Line-Feed