Optical Fibers measurement

Full inline quality certification

We have been investing for many years in specific R&D programs in close cooperation with the fiber producers to best answer their metrological needs and the continuous progresses of our product range. This historical CERSA investment and the experience acquired in production lines, represent an important expertise to best serve our customers.

Optical fiber measurement - a demand from large companies

We achieved our initial goal of a “Full in line quality certification” by choosing measurement principles and technologies that offer outstanding metrological performances and features at ultra-high frequencies. This allows a true real time measurement, true product characterization, process check and optimization, even on the fastest production lines.

The largest and the most demanding companies, choose CERSA instruments to certify their production and master their processes.

In 2018, more than 500 high speed lines are drawing with CERSA-MCI instruments worldwide.

Our advanced CIM PC software is a complete production quality management tool for the operators. It comes with our instruments for their parameter settings, to clearly display the production measurements as well as the detected defects, and generate real time parameters. The full option records all the measures and events on data base, compatible with any system.

Fiber thickness under control like many other paramaters

By implementaing these devices all along the draw tower, operators can monitor and adjust in near real time several parameters from the draw process and from the fiber.

Form bare fiber, cladding diameter measurement, airline detection, tension and spinning profile are ones of the most important data to analyse. After the coating cups, anothers instrument helps operators to measure final siameter, geometry defects like lump and neckdown and internal defects inside the coating ( bubbles, delamination, particles, impurities). All those data display by CIM software on screen, record, and analyse to globally sort and classify optical fiber.

All these data are transmitted via a classic RS232 serial link, or via field buses such as Profinet, Profibus, Modbus/TCP or EtherNet/IP. A large choice of communication interfaces Industry 4.0 compliant.

Our measuring devices


LIS-G: Laser Interferometric Sensor for Glass

5 in one gauge ! Ultra fast detection
For inline diameter measurements of bare optical fibres. The interferometric instruments are ideally suited for optical fibre diameter measurement and flaw detection on high-speed draw towers. Their very high performances open the way to complementary measures difficult to do before like spinning frequency and profile, ovality and diameter stability measurement.

AIR: Ultra fine "airline"

100% glass section coverage.
Airline detection with or without spinning. Mimum detectable : 0.3µm @400Hz.

NCTM: Non Contact Tension Measurement

Pure optical principle !
Absolute and high speed inline drawing force measurement. This apparatus allows the measure of the fibre drawing force without contact, without influence on the process. Range : 0 - 400 grams, uncertainty :+/- 1 gr.
CM5 1

CM5: Coating Monitor 5 axes

All in one ! Diameter and lump&neck detection
The CM5 is the only instrument able to show the real time process performances. It offers the fiber producers the capability to certify the whole production within the specification. Internal coating defect detection (bubbles, inclusions,...) and coating asymmetry measurement.

Our software solution

cim 1

CIM PROD Software

Our advanced CIM PROD PC software is a complete production quality management tool for the operators. It comes with our instruments for their parameter settings, to clearly display the production measurements as well as the detected defects and generate real time parametersand records all the measures and events on data base.
The PROD version has been developped for INLINE fiber optics measurements. Adjusting tolerances, triggering threshold, spool exchange are specific features for production environment.
draw tower

The drawing tower

In order to meet huge demand of optical fibre for telecommunications applications, many companies have had to build new plants and install new fibre facilities all around the world. Today the manufacturing process of optical fiber is quite similar regardless of...
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optical fiber

The drawing process

Everything starts with silica sand. High purified materials are then combined to manufacture a glass tube named Preform: a multi layered pure glass of around 20 centimetres round. Two perfect concentric tubes with different glass index for light transmission. Several different...
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