Abstract: Portable device for contactless measurement of a size, such as the diameter, of small and medium sized objects, such as wires, bars or tubes, even in movement, which comprises a light beam generator (1), two light beam deflector elements (2, 4) located opposite each other, a measuring region (3), an enlarging lens (5), a light beam splitting device (6). The light beam is split into two parts to form two separate images of the object (14) to be measured, being perceived by two linear image sensors (7.1, 7.2) and processed by two electronic circuits (8.1 and 8.2) and by an electronic processing component (9).

Abstract: System to automatically compensate the transversal oscillation of the scanning plane in a laser scanner used for profile measurement, by means of a special device.The invention concerns a system which automatically compensates the transversal oscillation of the scanning plane in a laser scanner used for profile measurement, by means of a device consisting in a triangular plane (1) integral with the gage, or by a mask photoengraved onto a plane-parallel glass plate (which is the last element of the optical chain) or onto the main lens, or by a pin in the shape of a truncated cone integral with the gage, or by opto-electronic components of different kind, such as, for example, multiple-element photo-sensitive devices, analogical photo-sensitive position sensors, linear arrays of photodiodes, etc.This system allows to determine the precise position of the scanning plane in comparison with the piece to be gaged, compensation achieved by means of one of the above-mentioned mechanical and opto-electronic devices.