Measuring birefringence can be accomplished using a "compensator," a calibrated, graduated wedge that is placed in series with the measured item.
测量双折射能够做到用“补偿”，校准，毕业于楔这是摆在一系列与实测项目。
2
This paper presents a new method for measuring resistance by voltametry-bridge type voltametry. It can eliminate effects of internal resistance of electrimeter without a compensator.
Measuring with a compensator is a standard ASTM test procedure 2 and is a particularly effective laboratory tool for quality control of clear plastics.