High Altitude Balloon: Could you steadily release helium as you gain altitude to prevent bursting?
I have recently been researching privately made High Altitude Balloons. Making something that can travel a third of the way to space while taking pictures and/or measurements sounds like a very cool project. Typically these balloons pop before reaching anywhere near space. While researching I had a small "Eureka!" moment for a potential fix for this issue. It might be possible to take these balloons farther up if you slowly release helium in correlation with altitude. Perhaps by measuring the size of the balloon as it expands upwards and out, and then releasing helium with an electronic valve until it returns to proper size.
I have the nagging feeling however I am not considering everything though. Is there some principle of 'The way things be' that prevents this method from working correctly?
Would the lift of helium increase with distance from the earth significantly enough not to drag the craft down when you release helium? Or would the helium loose its effectiveness the thinner the atmosphere became?
Any help I can receive in being unflummoxed is greatly appreciated.