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Everyone should use two beams of light!
With abs(L) and abs(R) in hand, the exact measurement is made:
ABS(L) - ABS(R) = CD
Two spatially dispersed beams, identical in all ways other than their orthogonal state of polarization, pass through one sample simultaneously.
The effect on the two beams by the sample is constructively related and is non-zero.
The non-sample effects (‘noise’) are seen equally in the two beams. All ‘noise’ is destructively related, so that its contribution to the answer (CD) is zero.
The sample's effect on the beams is the only measurable difference between the signals detected by the two independent detectors.
Only a chiral sample can alter the two phase coherent beams differentially.
Read more about the benefits of Olis DSM CD.
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