A differential method has been developed which determines displacement from the midpoint of optical transmission (±45°) and utilizes the coupled nature of the two signals for common mode noise rejection to enhance the detection of chiral species. A beam of light is modulated, applied to the chiral...http://www.google.com/patents/US7502111?utm_source=gb-gplus-sharePatent US7502111 - Differential optical technique for chiral analysis
