| 摘要 |
An optical analyser comprises a light source having a plurality of emitters 4 a . . . e selectably energisable by means of control unit 12 and computer 10. A tilting filter arrangement 8 is also provided having a plurality of optical interference filters 20 c say. Each filter is simultaneously tiltable to vary a wavelength of incident light from associated emitter, 4 c say, transmitted there through and along an associated light path 16 a . . . e, towards an analysing region 18. |
