Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the wp-slimstat domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /var/www/wordpress/wp-includes/functions.php on line 6114

Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the ninja-forms domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /var/www/wordpress/wp-includes/functions.php on line 6114

Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the updraftplus domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /var/www/wordpress/wp-includes/functions.php on line 6114
SPC2 Camera – Scripps Plankton Camera System

SPC2 Camera

Technical Specifications

  • Camera – 9 MP USB 3.0 Color Point Grey Grashopper 3
  • Imaging Lens – 0.508X, 1″ Format Telecentric Lens
  • Illumination – Pulsed White LED, Darkfield
  • Exposure Time – 10 to 60 μs
  • Field of View – 2.5 cm x 2.0 cm
  • Pixel Size (Object Space) – 7.4 μm
  • Optical Resolution – 32 lp/mm @ 30% contrast
  • Depth of Field – 400 μm @ 32 lp/mm @ 20% contrast
  • High-Resolution Imaged Volume – 0.2 mL
  • Blob-Detection Imaged Volume – Up to 10 mL
  • Embedded System – 1.8 GHz Big-Little Quad Core ODROID-XU3, 2 GB RAM
  • Image Processing – OpenCV


SPC2_res_targ_90mm_50mm
The image to the right shows the 1951 USAF resolution test chart as recorded by the SPC2 camera. The chart features groups of line-pairs of increasing spatial frequency (decreasing distance between bars). The image shows groups 2 through 5 are being resolved by the camera with Group 5, element 1 being the spatial frequency at which the camera is no longer able to resolve the bars with sufficient contrast. Group 5, Element 1 corresponds to a spatial frequency of 32 line-pairs-per-millimeter (lp/mm) and a bar width of 15.63 μm. The line plot below confirms this result and shows that we achieve a contrast of better than 30% at 32 lp/mm.