主题：【讨论】PE公司FTIR的AVC（空气和蒸汽补偿技术）和AVI是怎么实现的？

PE公司FTIR说明中好像很重点提到了两个技术：

AVC: Atmospheric Vapor Compensation, AVC features an advanced digital filtering algorithm designed to substract out CO2 and H2O absorptions in real time. AVC effectively eliminates interference from these atmospheric constitunents, allowing your lab to achieve the most accurate and reproducible results.

AVI: Absolute Virtual Instrument, AVIapproach to calibration allows the same standardization used on individual measurements to be applied to measurements collected over time. AVI standardizes the instrument's wavenumber scale to a higher accuracy than can be achieved with conventional calibration methods, resulting in transmission spectra that can be related easily and directly to theory. AVI's internal, traceable protocol allows data to be transferred quickly and accurately between instruments - whether they are side-by-side or across the world.

好像还有一个Sigma-Delta conversion 。 看过之后有点迷惑，AVC技术好像是实时的消除红外样周围空气中二氧化碳和水蒸气浓度变化引起的光谱变化，我们现在用的380一般就是直接做个背景，然后扣除，好像没有像PE这样实时的扣除，不知道这个功能PE是怎么实现的？

对于AVI技术，看到另外一份质料上讲是以内置的绝对标样来校正谱峰的形状和位置，保证测量的准确性及数据在仪器于仪器之间比较和传递的绝对一致性。我们使用nicolet 380时也就用PS标样做一下检定，好像没有说有这种内置的标样来进行校正，这种技术是怎么实现的？

迷惑 ^_^