NCTM: Non Contact Tension Measurement
Fiber tension measurement device
CERSA is the first measurement system manufacturer to have developed in 2008 an instrument based on the optical principle of birefringence. This principle is much more accurate and reliable for measuring the tension applied during the fiber drawing process than the commonly used vibrating string method.
The NCTM is able to cover a measurement range of 0 to 400 grams with an uncertainty of +/-1 gram.
Non-contact drawing force measurement: an essential parameter
A system that has become indispensable for the perfect regulation of the fiber drawing process during the start-up, stabilization and stopping phases. A simple, accurate and robust instrument that has won over many optical fiber manufacturers worldwide for the analysis of fiber tower parameters.
Customized versions (higher tension range and larger diameters) are available upon request for manufacturers of special fibers.
NCTM features (1,000 measurements/s):
- Tension measurement of the bare optical fiber diameter
- Tension range: 0 - 400 grams, uncertainty :+/- 1 gr
- Diameter range: 80 to 240μm*
*other diameter ranges upon request.
- X&Y position sensors with uncertainty of +/- 0.1mm help aligning on the draw tower
Digital and analog inputs and outputs, RS232 output, fieldbus options, are used to connect the NCTM to the tower PLC for control loop needs and measurement analysis.
Our software solution
for fiber optic measurement
CIM Software - Instrument manager
Our advanced CIM PROD PC software is a complete, production quality management tool for operators.
It comes with our instruments to provide their parameter settings, to clearly display the production measurements as well as any detected defects, and to generate real-time parameters and record all the measurements and events in a data base.
The PROD Full version has been developed for IN-LINE fiber optics measurements. Adjustment of tolerances, triggering threshold, and spool replacement are specific features for the production environment.
Our other fiber optic measurement tools
LISG: Laser Interferometric Sensor for Glass
5 in 1 gauge ! Ultra fast detection.
The LISG is designed for bare optical fiber measurements and for checking for defects during drawing. It uses interferometric fringe patterns produced by a fiber when placed in a laser beam.
Primary features :
- Real-time, high accuracy diameter measurements
- Airline defect detection (bubbles in the preform)
- Cladding non-circularity measurements
- Spinning profile and frequency measurements
AIR: Ultra fine "airline"
100% glass cross-section coverage
The AIR is designed to detect airline defects (bubbles in the preform stretched during drawing) in optical fibers. It uses the interferometric fringe patterns produced by a fiber when placed in a laser beam.
The measurement principle provides ultra fine airline detection, down to 0.3µm. By using 3 measurement axes, the AIR is the only instrument able to detect 100% of the airlines (with or without spinning) by covering 100% of the cross-section. Measurements are fiber position and vibration independent.
CM5: Coating Monitor 5 axes
All-in-one! Diameter and lump & neck detection
The CM5 is designed for coated optical fiber measurements and for checking for defects during drawing.
With its 5 measuring axes that cover 100% of the surface, and its exceptional measuring speed, the CM5 is the perfect instrument for a complete inspection of the coated fiber :
- Measurement of the outer diameter of the coated optical fiber
- Continuous detection of lump and neckdown flaws
- Detection of internal and surface defects and impurities in the cladding
- Detection of flaws, bubbles, delamination within the coated layers
- Measurement of the asymmetry of the glass within coating layers.
Our accessory tool for fiber optic measurement
The CS-FO is an accessory specially designed for calibrating and testing our fiber optic measurement equipment.
At the request of our main customers, we have marketed this accessory, which can be used to check the correct behavior of each measuring instrument, and to adjust the nominal diameter or tension (drawing force) for a specific fiber.
Articles related to the measuring device for optical fiber category and NTCM product
The optical fiber production process
Everything starts with silica sand. High purified materials are then combined to manufacture a glass cylinder called a Preform: a multi layered pure glass cylinder of around 20 centimeters.
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