Laser differential confocal ultra-long focal length measurement
A new laser differential confocal focal-length measurement method is proposed for the measurement of an ultra-long focal-length. The approach proposed uses the property of an axial intensity curve that the absolute zero precisely corresponds to the focus of the objective in a differential confocal f...
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| Veröffentlicht in: | Optics express 2009-10, Vol.17 (22), p.20051-20062 |
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| container_end_page | 20062 |
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| container_issue | 22 |
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| container_title | Optics express |
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| creator | Zhao, Weiqian Sun, Ruoduan Qiu, Lirong Sha, Dingguo |
| description | A new laser differential confocal focal-length measurement method is proposed for the measurement of an ultra-long focal-length. The approach proposed uses the property of an axial intensity curve that the absolute zero precisely corresponds to the focus of the objective in a differential confocal focusing system (DCFS) to measure the variation in position of DCFS focus with and without a measured ultra-long focal-length lens (UFL), uses the distance between the two focuses to obtain the UFL focal-length, and thereby achieving the precise measurement of ultra-long focal-length. The method has a high focusing precision, a strong anti-interference capability and a short measurement light-path. The theoretical analyses and preliminary experimental results indicate that the relative measurement error is about 0.01% when the method is used for the measurement of back-focus-distance (BFD). |
| doi_str_mv | 10.1364/OE.17.020051 |
| format | Article |
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| source | MEDLINE; DOAJ Directory of Open Access Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection |
| subjects | Algorithms Equipment Design Equipment Failure Analysis - instrumentation Equipment Failure Analysis - methods Image Interpretation, Computer-Assisted - instrumentation Lenses Microscopy, Confocal - instrumentation Reproducibility of Results Sensitivity and Specificity |
| title | Laser differential confocal ultra-long focal length measurement |
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