Phase shifting grating-slit test utilizing a liquid crystal display

Chao Wen Liang, Chien Fu Ou

Research output: Contribution to journalReview articlepeer-review

2 Scopus citations


A quantified focal plane testing method, termed phase-shifting grating-slit test, is demonstrated by utilizing a micro liquid crystal display. In contrast to the setup in the Ronchi Test, an incoherent illuminating grating is used and an optical slit is located at the image plane of the tested lens to modulate the aberrated wavefront. With the micro liquid crystal display generating and phase shifting the incoherent illuminating grating with variable frequency, a higher measurement dynamic range can be achieved on demand.

Original languageEnglish
Pages (from-to)476-478
Number of pages3
JournalOptical Review
Issue number4
StatePublished - 2009


  • Grating
  • Grating-slit test
  • Liquid crystal display
  • Phase shifting
  • Surface testing


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