Idea Man

I was practicing this morning and I always have my tuner on the stand (I don’t always look at it or believe what I see but that is just my own baggage). I wish there were a device that could measure the amount of air in my sound. Sometimes when I am playing and the sound is airy I can definitely hear it but this past week in my lesson we got to talking about sound and my teacher asked how a passage I played sounded. I thought it was okay but he said there was some air in the sound. I wonder if it is possible to build such a device. Can you measure pure sound?