Columbus, OH—Users of high-efficiency particulate air (HEPA) filters and ultra low penetration air (ULPA) filters (used in the nuclear industry and in cleanrooms) need to detect leaks as quickly and reliably as possible. A widely employed method of detecting leaks relies upon a photometer that measures light scattered from an aerosol. Typically, engineers atomize what's called a challenge agent, for example, dioctyl phthalate (DOP), upstream of the filter to generate the aerosol. A probe moving across the surface of the filter captures aerosol at the leak and delivers it to the photometer.
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