METHOD FOR OPTICAL MONITORING OF PARAMETERS OF STEEL CONTINUOUS CASTING AND OPTICAL METER Russian patent published in 2005 - IPC

FIELD: optical methods for monitoring technological parameters of steel continuous casting plant.

SUBSTANCE: method comprises steps of continuous frame by frame registration of irradiation of surface portion of continuously cast billet; converting signal to digital form; comparing several successive frames; calculating instantaneous motion of irradiation field of billet surface; determining current length of billet by summing instantaneous motions in desired time interval. Optical meter is arranged near sections of secondary cooling zone of plant for continuous casting of steel and orienting it to wide face of billet; registering image of surface in three ranges of wave length values, namely λ1 - λ2; λ2 - λ3; λ3 - λ4 and with use of known relationship of Wien - Planck temperature field of surface of continuous cast billet is obtained. Instantaneous motion of temperature field of cast billet in two directions is calculated, namely along edge of billet and along its central part for determining bulging degree of blank with use of given relation. Optical meter includes housing and successively arranged in it: lens, coordinate sensing photo-detector, unit for analog- to-digital processing, control unit and separate computer for storing archive data and displaying them. Prism is mounted behind lens and three coordinate-sensing photo detectors sensitive to different intervals of wavelength values are arranged behind prism. Outlet of each photo-detector is connected with inlet of analog-to-digital processing unit whose outlet is connected with inlet of control unit connected with computer.

EFFECT: enlarged functional possibilities of method due to measuring temperature field of lateral surface of continuously cast billet and bulging degree of billet by action of ferrostatic pressure.

2 cl, 6 dwg, 1 tbl, 1 ex