What is a laser micrometer ?

A laser micrometer is a tool generally used for non contact inspection and measurement of physical quantities like dimension, shape and geometry of an object. What distinguishes it from a conventional measuring device is that this measurement is made without contact thanks to a laser beam. This laser measurement is characterized by a very high measuring accuracy and a very fast acquisition speed.

A tool to measure diameter of a wire

For small object measurement, the use of laser micrometers is very useful because of their performance and non contact technology. There are many measuring instruments on the market that use scanning laser technology. A transmitting unit emits a laser beam that scans at a very high speed an object located in the measuring window. This object "cut" the beam and produce a shadow on the receiver located behind. In the case of measuring the diameter of a wire, the shadow time measurement corresponds to the diameter of the wire. Then, all measured data can be stored, analysed, stored and printed by operators for process control or quality certification.

Laser scanning is done through a system of rotating mirrors. However, this widespread technology is limited by its scanning speed and the use of rotating mechanical parts that reduce the reliability and lifetime of the laser micrometer. Also, this technology is highly sensitive to the wire vibration, and so it is indispensable to use averaging.

 

CERSA diameter measurement sensor

Laser micrometers have used a variety of light sources: laser diodes, helium-neon (HeNe) laser tubes, and LEDs. Our gauge also uses laser beam to measure wire diameter. But without any mechanical moving parts inside. Our measurement technology based on diffraction principle provides very high accuracy for each measurement and high repeatability. Our LDS instruments are also wire vibration independent. So, the measures don't need averaging  and offer a real tracking of the diameter fluctuation. Because CERSA has mastered diffraction measurement for many years, our instruments are able to measure the diameter of very thin wires from 2mm down to 5µm !