MEASUREMENT OF REFRACTIVITY CHANGES

摘要

Adverse effect of light source movement on test cell readout is avoided by sweeping the source back and forth and electronically processing the output; improved cell temperature control is provided by heat exchange between cell inlet and cell outlet streams; more light for improved performance is supplied by reflecting light leaving the cell chamber back into it; an integral lens is provided to further improve lighting; accurate zeroing is had by causing any change in light intensity during measurement to equally affect both outputs being compared; and shortening analog circuit response by discharging its capacitor.