Home / Appearance Testing Instruments / Surface Texture Analysis and Defect Quantification / Robo-TAMS – Automated Total Appearance Measurement System
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Robo-TAMS Automated Total Appearance Measurement System

The new standard for paint appearance measurement

TAMS measurement sensor integrates fully into an inline inspection process

Measuring automotive paint finishes

The Rhopoint TAMS provides measurement data that closely correlates to human perception, is easier to understand and communicate

For maximum impact, an automotive paint finish must instantly produce an appealing visual sensation for the customer. This can only be achieved if the overall surface finish displays both high quality and harmony.

Rhopoint TAMS™ has become an industry standard way of quantifying appearance quality inspired by a four-year collaboration between Rhopoint, Volkswagen AG and AUDI AG.

This innovative new technology models the human perception of surface appearance quality, providing new parameters that revolutionise the understanding and communication of visual appearance information.

Improved correlation and easy communication gives Rhopoint TAMS™ a major advantage over existing methods that produce complex results relying on the user to interpret the values into a real-life visual experience.

TAMS technology provides opportunities to:

Improve surface finish

Establish improved quality criteria

Remove subjectivity in visual assessment

Robo-TAMS Automated Total Appearance Measurement System

TAMS measurement sensor integrates fully into an inline inspection process

Fast measurement time

Larger field of view

Integration into any SPC

Contactless measurements

Communicates via ethernet protocol

All measurements made with Robot-TAMS are compatible with measurements made with the Rhopoint TAMS™.

Robo-TAMS is designed for top coat evaluation as part of the production line or offline measurement cell. The sensor is able to able to capture high resolution maps of surfaces and has the possibility to measure e-coat and raw materials.

When viewing a vehicle surface, the eye naturally adjusts focus several times. Focusing on the environment, it looks at images of reflected objects observing distortion and clarity. Focusing on the surface the eye observes waviness, texture and defects.

Movement by the viewer during observation causes the reflected environment to move across the surface. This natural action increases the perception of waviness.

The brain processes this information and formulates sensations of quality and harmony.

TAMS technology defines:

Tech - Car-quality

Quality

One single value rates the total appearance quality of a surface. 100% indicates a smooth finish with perfect image forming characteristics.

TAMS quality is calculated using waviness and sharpness values predicting the visual rating of the customer.

Tech - Car-harmony

Harmony

Based on extensive human perception research by AUDI AG, this value indicates the acceptability of adjacent car parts. It is calculated using Waviness and Dimension parameters.

A value of >1.0 indicates parts are not similar and if viewed together will detract from overall visual quality.

TAMS Perception

Data from the TAMS vision system is processed using perception algorithms derived from extensive human perception studies.

Perception - Picture1.75-no-logo

Sharpness

Sharpness quantifies the accuracy of images reflected in the surface, 100% indicates a perfect reflection.

At close distances (<0.5m) SHARPNESS measures how well surface reflects fine details. At showroom viewing distance (1.5m) SHARPNESS quantifies haze and clarity.

Sharpness - Close-distance-unsharp-S65

Close Distance view of an unsharp surface: S=65%

Black and white high contrast image of the iconic 20 Fenchurch Street building in London. With its 180 meters height, it is one of the highest buildings in City of London.

Close Distance view of a sharp surface: S=98%

Black and white high contrast image of the iconic 20 Fenchurch Street building in London. With its 180 meters height, it is one of the highest buildings in City of London.

Showroom Distance view of an unsharp surface

Black and white high contrast image of the iconic 20 Fenchurch Street building in London. With its 180 meters height, it is one of the highest buildings in City of London.

Showroom Distance view of a sharp surface

Contrast

Contrast is related to the colour of the surface; white and metallic surfaces have low contrast, a deep black measures 100%. Contrast quantifies the visual impact of orange peel and haze effects both being more visible on high contrast dark colours.

Contrast - Reflection-white-surface

Reflection in a White surface

Contrast - Reflection-black-surface

Reflection in a Black surface

Dimension

Indicates the dominant structure size perceived at showroom viewing distance. Typical values are between 1–6mm, the dominant structure size is important in determining the harmony between adjacent panels/parts.

Black and white high contrast image of the iconic 20 Fenchurch Street building in London. With its 180 meters height, it is one of the highest buildings in City of London.

Small structure dominant surface: D=1.2mm

Black and white high contrast image of the iconic 20 Fenchurch Street building in London. With its 180 meters height, it is one of the highest buildings in City of London.

Large structure dominant surface: D=6.5mm

Waviness

Correlated to human perception, waviness quantifies the visible impact of surface waves to an observer at showroom distance (1.5m). The waviness of a surface is critical for determining appearance quality. Low waviness surfaces tend to be preferred by the viewer.

Black and white high contrast image of the iconic 20 Fenchurch Street building in London. With its 180 meters height, it is one of the highest buildings in City of London.

Flat surface: W=0

Waviness - Wavy-surface

Wavy surface

TAMS Vision

To achieve close correlation with human perception TAMS emulates the human evaluation of a reflective surface, changing its imaging system focus from surface to reflected image.

Vision - Calculate-sharpness-and-contrast.

The image transfer qualities of the surface are measured and used to calculate sharpness and contrast.

Black and white high contrast image of the iconic 20 Fenchurch Street building in London. With its 180 meters height, it is one of the highest buildings in City of London.

Waviness is calculated by quantifying distortion in a reflected image.

Vision - Surface-topography

Surface topography is analysed to identify the Dominant structure.

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Specifications

Sharpness
UnitsS (%)
Minimum (No visible reflection)0
Maximum (Perfect mirror)100
Resolution0.1
Repeatability0.1 (SD)
Reproducibility0.5 (SD)
Measurement TechniqueOptical Transfer Function
Contrast
UnitsC (%)
Minimum (Perfect Diffuse White)0
Maximum (Perfect Black)100
Resolution0.1
Repeatability0.1 (SD)
Reproducibility0.3 (SD)
Measurement TechniqueOptical Transfer Function
Waviness
UnitsW (W units)
Minimum0
Maximum (typical)30
Resolution0.1
Repeatability0.2 (SD)
Reproducibility1 (SD)
Measurement TechniqueReflected Image Line Deformation Analysis
CorrelationAUDI AG MDS Perception analysis
Dimension
UnitsD (mm)
Minimum0.5
Maximum (typical)8
Resolution0.1
Repeatability0.1 (SD)
Reproducibility0.4 (SD)
Measurement TechniquePhase Measurement Deflectometry
CorrelationAUDI AG MDS Perception analysis
Quality
UnitsQ (%)
Minimum0
Maximum (typical)100
Resolution0.1
Repeatability0.8 (SD)
Reproducibility1 (SD)
AlgorithmCalculated using Sharpness & Waviness
CorrelationAUDI AG MDS Perception analysis
Harmony
UnitsH (H units)
Minimum0
Maximum (typical)8.9
Resolution0.1
Repeatability0.1 (SD)
Reproducibility0.2 (SD)
AlgorithmCalculated using Waviness & Dimension
CorrelationAUDI AG MDS Perception analysis
Measurement sensor
Fully enclosed unit with integrated capture and analysis
Measurement Area50 x 60mm FOV (field of view)
Compatible resultswith Rhopoint TAMS™
Capture Time<2 Seconds
Spatial resolution32um / pixel
Results outputCSV
Positioning error detection
Calibration station for instrument check and focus setting
Inbuild optical component contamination reduction system
Power and Connectivity
ConnectionLAN Ethernet
Flexible connection options
Power24 Volts (max current 3 Amps)
Range of robot mounting options