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How Does It Works?

The AEROEL laser gauges series XLS use a visible Laser Diode as a high intensity, monochromatic light source: a thin beam of this light is then collimated onto the object to be measured. The laser beam is deflected at constant speed by a turning mirror positioned at the focus of a transmitting lens, so as to obtain a parallel-moving scanning beam in the measuring field. During the scanning period, the laser beam intercepts the object being measured and casts its shadow onto the receiver.

The duration of the shadow is proportional to the transversal dimension of the measured object, while the duration of the light is related to the object position in the measuring field. Inside the receiver a lens gathers all the light from the transmitter and concentrates it on a high-speed photo diode. The photodiode signal, after suitable manipulation, is processed by the microprocessor which calculates the edge detection times and takes the measurement of the diameter and the position. Other measurements that are determined by edge detection can also be measured with great precision and in fractions of a second: in whichever case where the edges of one or more shades can represent the dimension to be measured, laser gauges are the ideal solution to the problem of control.

In practice, the instrument consists of a transmitter that contains the laser diode and the optical/mechanical scanning system and a receiver fitted with the detection photodiode and the electronics to process the optical signal. The electronic system inside the gauge consists of 4 boards that are common to all Aeroel gauges (Unica system)


schemaBoard 1: supply unit

Board 2: motor and diode laser driver

Board 3
: video signal processing and edge detecting

Board 4
: CPU and communications


At board 3 output there are binary signals (impulses) which when transmitted to an Aeroel CE-10 or IBU electronic unit allow the piece diameter and position to be calculated. In this case the signals are processed by the microprocessor in the external electronic unit -: the XLS gauges are thereby compatible with the previous generation ALS gauges to all effects. The signal processing methods and performance of the gauge are determined by the external unit’s EPROM resident software.

Board 4, fitted with its own Flash memory resident software and reprogrammable externally, allows internal processing of the measurements and use of the gauge as a real intelligent sensor : the results of the measurements are transmitted externally by means of Ethernet / Rs232 / Rs485 communication lines. The measurement type and method and the communication protocols essentially depend on the software installed in the gauge and are described in the software manual.


Logo UeLogo MinisteroFriuli venezia GiluliaFonfo SviluppoProgetto cofinanziato con il Fondo Europeo di Sviluppo Regionale del Programma Operativo Regionale del Friuli Venezia Giulia Obiettivo "Competitività Regionale e Occupazione" programmazione 2007/2013