Log In Sign Up

NOTE: This is an unformatted excerpt from our online fire protection training library.

Nature of Smoke

Visibility through Smoke

Measuring Transmittance

Transmittance is measured by monitoring the attenuation of a beam of light passing through a path length, x, of smoke as illustrated below.

The light can be from a columnated source or a laser. When the atmosphere is "smoke free," the intensity of light remaining after it has passed through the path length is almost exactly the same as the intensity at the beginning of the path length, and the transmittance is almost one. It follows that the transmittance of a beam passing through "visible smoke" is less than one.
NOTE: This is an unformatted excerpt from our online fire protection training library.

Contact Us:

Please fill in the fields below:

    Privacy Policy
    Please choose all that interest you.

    Contact Customer Service at AcademySupport@jensenhughes.com or 800-930-9414 option 1.

    Our regular support hours are 9:00 AM to 5:00 PM, Monday through Friday, except holidays...