Patent ID: 6020961
Filing Date: 2000-02-01
Classification: G01N

Abstract:
Nephelometer for optically detecting scattered light from an illuminated sample, comprisingan illumination device (10) for illuminating a sample, the illumination device (10) comprising a light source (11; 21), an exit lens arrangement (14) and an exit opening shutter (15) arranged, in this order, on a common optical axis originating in the light source (11; 21) anda detector device (19) for detecting the scattered light from the sample, the detector device (19) comprising a central shading element (17) for absorbing light directly passing through the sample from the light source (11; 21)and impinging on the detector device (19), a detector entrance lens arrangement (18), a second shading element (20) for absorbing light from the light source (11; 21) directly impinging on the detector device (19) from the exit opening shutter (15) of the illumination means (10) and a detector (22), which are arranged, in this order, on the optical axis,the exit opening shutter (15) of the illumination device (10) and the entrance lens arrangement (18) as well as the two shading elements (17, 20) of the detector device (19) being arranged such that the central shading element (17) is in a plane conjugate to the light source (11; 21) and the second shading element (20) is in a plane conjugate to the exit opening shutter (15).