2. Frequency Scanning Interferometry in detail 3 Oxford contributions to IWAA 2002 Multiple, simultaneous length measurements S. M. Gibson et al (After the next presentation) P. A. Coe et al (This presentation) Combination of FSI with other novel optical tools A. Mitra et al (Final presentation of IWAA 2002)

3. Frequency Scanning Interferometry Motivation : Measure any length (range 60 mm to 1.5 m) to 1  m Want to be able to - Measure inside ATLAS tracker during operation High radiation and low temperature -20 deg C Very little space : no access, have to measure remotely Components inside ATLAS must be low mass Must be maintenance free for 10 yr ATLAS lifetime AND…

4. … we want to make … 800 length measurements simultaneously! Motivation :

7. Frequency Scanning Interferometry Fine tuning subscans

15. (Reference phase)