Apparatus and method to compensate for refraction of radiation
US4912529A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1987 |
| Grant date | Mar 27, 1990 |
| Priority date | — |
| Expiry date | Aug 7, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/0638
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus to compensate for refraction of radiation passing through a curved wall of an article is provided. The apparatus of a preferred embodiment is particularly advantageous for use in arc tube discharge diagnostics. The apparatus of the preferred embodiment includes means for pre-refracting radiation on a predetermined path by an amount equal and inverse to refraction which occurs when radiation passes through a first wall of the arc tube such that, when the radiation passes through the first wall of the arc tube and into the cavity thereof, the radiation passes through the cavity approximately on the predetermined path; means for releasably holding the article such that the radiation passes through the cavity thereof; and means for post-refracting radiation emerging from a point of the arc tube opposite its point of entry by an amount equal and inverse to refraction which occurs when radiation emerges from the arc tube. In one embodiment the means for pre-refracting radiation includes a first half tube comprising a longitudinally bisected tube obtained from a tube which is approximately identical to the arc tube's cylindrical portion and a first cylindrical lens, the first…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.