Wire diameter measurement, laser diffraction sensor, LDS

Fines wires

LDS: Laser Diffraction Sensor

For very fine wire diameter measurement

$laser diffraction sensor$ The original LDS instruments have been designed in 1987 to meet a specific demand for in line measurement of fine wire diameters (steel cord). Since, they have been widely used in the wire industry on production lines but also in laboratories.

The LDS, its new version, benefits of the very latest technologies but also of the CERSA’s experience in wire industries. More options and accessories have been added to simplify specific applications. That results of the continuous support and cooperation of our customers. The LDS are today one of our key products, used world wide.

very fine wire diameter measurement, shape measurement

“Display and keyboard options”
Sizes: 210x60x100mm

LDS0650-H2
2 axes High frequency

Ξ Main advantages

On machines: wire vibration measurement independents

In laboratory: low measurement uncertainty in % of the diameter.

Very high measurement stability and accuracy in time

Long lifetime, entirely static, no moving parts.

Metrological characteristics mentioned for each individual measures. No averaging

Ξ Measurement ranges

LDS2000 »» Ø 50 to 2000 µm (1.8 to 78.7 mils) 1 axis only today
LDS0650 »» Ø 15 to 650 µm (0.6 to 25.6 mils) 1 or 2 axes (H only)
LDS0200 »» Ø 5 to 200 µm (0.2 to 7.8 mils) 1 or 2 axes (H only)

Ξ Metrology

Frequency: 50Hz (Standard version) or 800Hz (1 axis) and 400 Hz (2 axis) for the H versions.
Repeatability: ±0.02 % of the diameter in laboratory, ±0.03% in production.

Limitations:
LDS2000: ±0,09 µm (±0.0035 mils)
LDS0650: ±0,03 µm (±0.001 mils)
LDS0200: ±0,01 µm (±0.0004 mils)

Ξ General functions

Temperature compensated measurements from 10 to 40°C (50 to 104°F).
Calibration according to international standards
RS232C/RS485 serial links
Local network connection
Wire feed count and speed computing
FStatistic functions
Max. and min. of diameter & position in the spool

Average diameter

Standard deviation

Ξ Options

Common options for LxS line:
Local display with I/O
Local keyboard
Portable battery powered instrument

Label printer
Pedal contact
Dust protection
Oscillating support for in line shape measurement.

Wire sample rotation at constant tension (ovality). (here on the right).

Wire Rotation System, for fine wires, fitted on the LDS, it let clamp the wire at each end and insure an adjustable constant tension. It allows getting diameter changes over one turn with a very high repeatability.

It displays the average, maximum, minimum, difference, roudness (%). It allows the linearization and the calibration according to the weight method.Specially made for die shops, final wire inspection.

Standard fine wires for LDSN calibration
The accurate calibration of the LDS in the very fine diameter range is made in relation with international laboratories.

We propose reference wires on supports designed for these instruments, to allow calibration check and update. Wires are maintained at constant tension.

- The stainless steel wires are drawn with an excellent surface quality.

- The diameter uncertainty is within ±0.1µm.

- They come in set box of 4 wires from 30 to 2000µm, depending of the range.

1 axes reference wire

Ξ PC Software for Windows

Parameter setting, display and measure recording
Production management for instruments in a network.

One PC software (mono sensor) comes with each first instrument delivered. It can be used for instrument setting, maintenance, data recording, etc.