METHOD RELATING TO THREE DIMENSIONAL MEASUREMENT OF OBJECTS

A method for three dimensional measurement of objects being conveyed through or moved relative to a measurement frame for, by incremental measurements of height, width and length of the object to calculate cubical and circumscribed volume of the object. Each transmitter/receiver element pair of the measurement frame is calibrated by controlling the amount of the light emitted from the transmitter and the threshold level of the receiver, such that the signal/noise ratio of the receiver lies above a specific limit, simultaneously with the illumination time being kept the shortest possible. By incremental measurements at least one pair consisting of transmitter element and directly opposite receiver element in the measurement frame is activated at time, and an external signal being a function of the movement of the object relative to the measurement frame is compared with the registered signals from the receiver elements for calculation of the volumes. The measurement frame is constructed in the form of horizontal and vertical transmitter- and receiver modules consisting of the transmitter elements and receiver element respectively. A computer is connected to the measurement frame for calibration of the respective transmitter- and receiver elements of the measurement frame and for calculation of the volumes being derived as a result of shadow images of the object on the receiver elements. A display is associated with the computer for display of the volume magnitude of the object. Utilization for e.g. calculation of freight charges of objects.