Light scanner web profile measurement apparatus and method

摘要: A method and apparatus provide for determining properties of a web traveling sheet material by scanning light including at least selected wavelengths such as IR and/or visible across the also two calibration samples. The signals generated in response to samples is used calibrate operation preferably on every scan. By providing samples, better estimates average parameters can be made detection faulty sample facilitated. are protected mounting them within scanner housing relatively close proximity beam generator. In addition, compensation supported substantially adjacent moving one positioned each side web. fault conditions or fouling either readily detected generate an signal. Compensation particularly advantageous accounting ambient operating process being manufacture material. Both encapsulated glass other appropriate maintain their defined characteristics without effecting monitoring operations optical scanner.