Patent ID: 7528951

Claim:
A measurement system comprising: a light source directed along a first axis and configured to illuminate a sample volume; a first sensor aligned along a second axis and configured to detect scattered light in the sample volume; a first lens system aligned along the second axis and located between the sample volume and the first sensor, first sensor, with the first lens system comprising: a first reflecting lens aligned along the second axis where the first reflecting lens has a first focus on the second axis and a second focus on the second axis where the second focus is between the first focus and the first reflecting lens and where the second focus is positioned in the sample volume; a first field lens located on the second axis and positioned such that the second focus of the first reflecting lens occurs inside the first field lens; a first relay lens system aligned to the second axis where the first relay lens system forms a first focus at the second focus of the first reflecting lens; a second sensor aligned along a third axis and configured to detect scattered light in the sample volume; and a second lens system aligned along the third axis and located between the sample volume and the sensor, with the second lens system comprising: a second reflecting lens aligned along the third axis where the second reflecting lens has a first focus on the third axis and a second focus on the third axis where the second focus is between the first focus and the second reflecting lens and where the second focus is positioned in the sample volume; a second field lens located on the third axis and positioned such that the second focus of the second reflecting lens occurs inside the second field lens; a second relay lens system aligned to the third axis where the second relay lens system forms a first focus at the second focus of the second reflecting lens.