Patent ID: 7141141

Claim:
Apparatus for on-machine determination of paper web qualities during the manufacture of said paper web, comprising: a dryer section of a papermaking machine; a scanning beam measurement device located in said dryer section for determining profiles of paper web qualities measured in a given direction; and said scanning beam measurement device being located in substantially close proximity to a doctor element or blow tube so as to form an integrated structure therewith; said scanning beam measurement device providing a scanning beam for scanning said paper web, including at least one sensor, whereby the sensor and its actuating elements are located in the interior of a box-section beam enclosure so as to leave only a lens portion of the sensor flush with the exterior surface of the enclosure, said box-section beam enclosure having a sealed structure and being provided with ventilation air blowing equipment serving to keep the interior space of the beam at a controlled temperature and pressurized atmosphere in regard to the ambient environment.