color sensor systems for quality control in textile...

MAZeT GmbH – JENCOLOR Innovation Forum 2013 | 1 Registrierte Produktmarke der MAZeT GmbH für Farb- und Spektralsensorik

Color Sensor Systems for Quality Control in Textile Industry Dr. Winfried Mahler – JENCOLOR Innovations Forum 2013


Color Sensor Systems for Quality Control in Textile Industry

Requirements

Speed of textile rolls: 60 m / min

Measurements: 500 samples / s 2 ms / sample

Spot: 20 mm

Distance: 10 ... 15 mm

Measurement method: Tristimulus / True Color

(Based on human eye perception)


Requirements

Accuracy : Delta E < 0.5 class two

Delta E < 0.3 class one

For comparison: Delta E < 3 no visual difference

Color Sensor Systems for Quality Control in Textile Industry


Comparison of Filter Shapes

Round shaped filters Square shaped filters Hexacomb shaped filters


Sensor and Filter areas of the MTCSiCS / MTCSiCF

• Perfect for fiber optics

• Perfect for lenses


• Not suitable for fiber optics

• Not suitable for lenses

• Suitable for monitors and TV,

• Suitable for mobile phones

Unusable areas ~ 21,3 % loss

Benefits and Disadvantages of Filter Shapes


Interference filters vs Absorbtion filters

Color filters

Interference Absorption

organic

inorganic

Filter characteristics are

independent from light level

Filters are stable even in

sun light over years

Filters bleach / lose color

due to influences of

time in light intensity


Transmission factor of interference vs absorption filters

100 % 100 % 30 % minimum absorption

No minimum absorption

Interference filters Absorption filters


Reasons for using MAZeT Color Sensors for Textiles

The reasons are:

• Dark colors

• Distance to garment surface, materials

• Motion of the materials

• In-line measurement requires sample & hold timing

Spectrometers are not suitable:

• One shot measurement evaluates the color of different locations

• The accuracy of spectrometer is a question of the calibration

• The high spectrum values gives no additional information for the human eye

Each measurement is a scaled comparison between sample and a reference

(These values are taken from a data memory)


Realisation of Hardware I

The eye: sensor board with MTCSiCS

Colors → currents → digital values → serial data protocol


Realisation of Hardware II

Si-CM-1 Interface Board

Data SPI bus (several color sensors) → data USB2.0


Optical Mechanical Construction of Color Sensor Device

Sensor Aperture Measurement Spot


Accuracy based on human eye perception and not machine vision

Applications of MAZeT´s True Color Sensors


Further Applications of MAZeT´s True Color Sensors

Devices from Sensor Instruments GmbH / Germany

Further industries for example: plastic, paper, bottles, and more...

color sensor systems for quality control in textile...

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