Optical Fibers measurement
Full inline quality certification

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

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.

Optical fiber measurement - a demand from large companies

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 fiber 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 logs all fiber data  such as mesures and  events into databases, 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 nearly in 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 datas 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 these datas are displayed by CIM software on screen, recorded, and analyzed to globally sort and classify optical fiber.

All these datas 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 for industries 4.0 compliant.

Our measuring devices

LISG 1

LISG: Laser Interferometric Sensor for Glass

5 in one gauge ! Ultra fast detection
The LISG is designed for bare optical fiber measurement and defect check during drawing. It uses the interferometric fringes pattern produced by a fiber when placed in a laser beam. Main features :
- Real-time, high accurante diameter measurement
- Airline defect detection (bubble into the preform)
- Spinning profile and frequency measurement
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AIR 1

AIR: Ultra fine "airline"

100% glass section coverage.
The AIR is designed to detect airline defect (bubbles into the preform stretched during drawing) into optical fiber.
It uses the interferometric fringes pattern produced by a fiber when placed in a laser beam. The measurement principle allows ultra fine airline detection, down to 0.3µm. It's the only instrument able to detect 100% airline (with or without spinning). Measurment is fiber position and vibration independent.
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NCTM 1

NCTM: Non Contact Tension Measurement

Pure optical principle !
The NCTM is designed to measure the drawing force (tension) during optical fiber production. It uses a pure optical principle based on birefringence (light polarization).
Measurement capability from the startup to the end of the drawing process. Range : 0 - 400 grams, uncertainty :+/- 1 gr.
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CM5 1

CM5: Coating Monitor 5 axes

All in one ! Diameter and lump&neck detection
The CM5 is designed for coated optical fiber measurement and defect check during drawing. It includes several different principles :
- laser diffraction for diameter measurement.
- shadow energy on 5 axes for Lump&Neck detection
- diffused energy for internal defect detection
- laser interferometry for asymmetry measurement
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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 parameters and records all the measures and events on data base.
The PROD version has been developed for INLINE fiber optics measurements. Adjusting tolerances, triggering threshold, spool exchange are specific features for production environment.
Specifications
 
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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