Optical fibers
LIS-G : Laser Interferometric Sensor for Glass : (Brevet international)
For
on line 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 ovality of the bare fibre.
Ξ High performance measurements
- Absolute diameter measurement within ±0.15 µm.
- Analog diameter measurement and flaw detection of 50KHz band pass
- Diameter reapetability and stability below ±0.02µm.
- Fibre vibration measurement independent.
- Real time diameter frequency spectrum measurement and analysis: Spinning
frequency, ovality of the fibre, process stability check.
- X-Y fibre position analog measurement band pass of 10 Khz, ±0.02mm
- X-Y self fibre frequency vibration measurement: drawing force evaluation
- Real time detection of diameter out of tolerance.
- Statistics computing.
Ξ Defects detection
- Real time internal and external flaw detection (100KHz).
- Very fine airline diameter detection: 0.7µm. Full coverage of
the glass section when spinning the fibre at 400Hz.
- Real time event recording (production reports).
Ξ Autre fonction
- Fiber feed pulse counting for length and speed computing.
Ξ Sorties
- Analog diameter measurement of ±10V, 100 KHz.
- X & Y fiber position or Energy & Contrast analog outputs ±10V,
10Khz.
- Analog fiber vibration frequency: refer to nominal value.
- Digital outputs: alarms, defects.
- RS232C serial link : access to internal parameters and measurement results.