G | PHYSICS |
01 | MEASURING; TESTING |
J | MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY |
1 | Photometry, e.g. photographic exposure meter |
02 | Details |
04 | Optical or mechanical part ; supplementary adjustable parts |
0407 | Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings |
0455 | having a throughhole enabling the optical element to fulfil an additional optical function, e.g. a mirror or grating having a through-hole for a light collecting or light injecting optical fibre |