Electro-optical leveler using CMOS image sensor

Jih Huah Wu, Rong Sen Chang

Research output: Contribution to journalConference articlepeer-review


A low cost, compact electronic image leveler using a CMOS image sensor is developed for level measurement. Optical system with two lenses is designed to get tilt information of total system. One lens is designed in bowl shape that can hold liquid. The gravity of the light spot on CMOS image sensor is converted into pixel coordinates proportional to the tilt angle to be measured. The reading tilt angle could be estimated with resolution better than 8 sec of arc.

Original languageEnglish
Article number28
Pages (from-to)186-191
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2005
EventProceedings of SPIE-IS and T Electronic Imaging - Sensors and Camera Ssytems for Scientific and Industrial Applications VI - San Jose, CA, United States
Duration: 18 Jan 200520 Jan 2005


  • CMOS image sensor
  • Centroid method
  • Level
  • Tilt angle measurement


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