FOV and speed calculator

Selecting appropriate lens

• All qtec camera heads are made with the C-mount type lens mount.
• Check the sensor list in order to determine the required lens size (based on sensor size)
  • fx: 1/2" (IMX990) or 1/4" (IMX991)
• Remember to select a lens with the appropriate resolution (pixel size)
  • A low resolution lens can result in the blurring of pixels

Calculating FOV and framerate

• Desired field of view (FOV) or pixel/mm resolution

• Desired working distance

• Sensor size (image and pixel sizes)

• Slit size for spectrograh (default: 20um)

• Formulas:

  • focal_length[mm] / sensor_size[mm] = distance_to_object[mm] / field_of_view[mm]
  • sensor_size[mm] = sensor_size[px]*pixel_size[um]*1000
  • resolution[mm/px] = field_of_view[mm] / sensor_size[px]
  • field_of_view[deg] = 2 * atan2(sensor_size[mm]/2, focal_length[mm]) * 180/PI
  • sensor_size_y[px] = slit_size[um] / pixel_size[um]
  • framerate = 1 / (resolution[mm/px] / belt_speed[mm/s]) for keeping aspect ratio
  • framerate = 1 / (sensor_size_y[px] * resolution[mm/px] / belt_speed[mm/s]) for 1 to 1 sampling