Home / Appearance Testing Instruments / Haze Meters / Rhopoint ID Transparent Appearance Analysis Meter
rhopoint-id-logo

Advanced & Complete Analysis of Transparent Appearance

  • Haze measurement correlated with existing standards (ASTM D1003)
  • New parameters matched to human perception
VY4A2842-new-screen

Why measure the appearance quality of transparent materials?

Objects made from transparent materials are common in everyday life, clear plastic is used in packaging film and drinks bottles, windowpanes and windshields are made from glass, mobile phones are protected by a clear protective display.

The function of transparent materials is often to form a barrier which allows a clear view of a protected object or a scene beyond it. Manufactured products however, are rarely perfectly transparent-inhomogenieties in base material, surface texture caused during manufacture or scratches and abrasion reduce see-through quality.

As these effects can reduce the perceived quality and functionality it is important that they are accurately quantified. Accurate measurement provides opportunities to optimise materials or processes during manufacture.

Materials with high optical quality have low visual impact on objects viewed through them. The material itself is visually unobtrusive and almost invisible to the observer.

A hazy material causes colour seen through the material to appear washed out or faded. The severity of this loss of contrast is often related to the size of the gap between the object and the material.

A material which blurs the view of objects has low sharpness- this effect can be directional causing a visible pattern to be seen in the material.

Materials with poor optical qualities are visually intrusive and can be described as milky or opalescent. Patterns and texture which may be visible in the material drastically blur viewed objects.

What is the Rhopoint ID?

The Rhopoint ID is a haze and transmission meter that measures what the eye can see. It quantifies the see-through qualities of materials in a method that can be matched to real world conditions with results highly correlated to customer perception.

The unique Rhopoint ID method fully characterises the transparency of a material in a single measurement.

id-highlight-graticule

Step 01

A backlit, high accuracy, reference target graticule functions as the viewed object, creating a highly defined pattern of light intensities with optimally sharp transitions between the backlit and masked areas.

Lens-eye

Step 02

The camera works like the human eye quantifying changes in the transmission of the light caused by a test material.

id-hts-screen

Step 03

Image analysis techniques are used to characterise these effects into parameters which correlate closely with human perceptions.

Applications

ID measurements can be used to quantify the see-through quality of any transparent material: plastic films, plastic sheets, liquids, glass, PET bottles and more...

phone-film
sanitiser-gel-bottle
car-windscreen

Haze = 0%

Haze = 30%

Haze

Haze: quantifies the loss of contrast for objects viewed through a material.

When a material has haze, it changes the appearance of both the material and any objects viewed through it. This can lead to a reduction in perceived quality.

  • The product viewed through the material appears lifeless and dull - but details remain sharp
  • The colour of a viewed object appears washed-out and faded
  • The material itself appears cloudy or milky.

What affects Haze?

Haze can be affected by factors such as the choice of resin, the moulding process and any surface textures. Haze can be caused by:

Raw material choice: For example, a plastic with an incorrect melt viscosity for a particular process.

Process parameters: Cooling a plastic material too quickly can introduce micro textures onto the surface of the film or structures in the bulk which reduce optical quality.

Machine wear: Wear and tear in moulds, chill rollers and slip dies can induce visible surface defects in the material.

closeup-haze
  • Haze is measured directly by evaluating contrast of black and white areas on graticule

  • Measurements made with the Rhopoint ID are fully comparable with those made on an ASTM D1003 hazemeter

  • Automatically operates when ASTM Haze platen (8 mm thickness) is placed in position on instrument between the graticule and a sample

  • Factory calibrated to ASTM standards for a quantitative match

Distance Dependent Haze

Many materials exhibit a variation of transparency depending on whether the material is in contact with a viewed object, or separated by an ‘air gap’ distance between them.

Why is Distance Dependence important?

Matching the material exactly to the application allows quality improvements and production cost savings.

To match a specific material application the Rhopoint ID can measure ID Haze at any distance within 0–40 mm.

Using the ID it is possible to identify the air gap distance at which maximum Haze is obtained (typically <25 mm).

Haze and Distance

The images below show the effect of air gap distance for a hazy plastic film held in front of an image.

haze-contact

Contact
H = 9.99

graticule-contact-distance
haze-8mm_distance

Haze to ASTM D1003 (8mm)
HASTM = 30.98

graticule-8mm-distance
haze-30mm_distance

30mm Distance
H = 76.74

graticule-30mm-distance
closeup-rhopoint-id
  • Direct measurement of haze from transmission image contrast

  • Measured in contact or at user-defined distance between material and object (0–40 mm)

  • Measures distance dependence on the same scale as ASTM Haze

  • Direct measurement of transparency via contrast of black and white areas
    on target graticule

  • Measure and understand distance dependent haze

security-glass-original-web

High distance dependence of haze is desirable for privacy/security glass and films which are designed to obscure a view without blocking light.

Sharpness

Sharpness quantifies the loss of perceived detail for objects viewed through a material.

What are the effects of reduced Sharpness?

When viewed through a material with high sharpness, an object appears sharp and distinct. As material sharpness decreases, the object appears blurry and obscured.

berries-high-sharpness

High Sharpness
(S = 98.71%)

high-sharpness-98.71-graticule
berries-medium-high-sharpness

Medium-High Sharpness
(S = 76.34%)

high-sharpness-76.34-graticule
berries-medium-low-sharpness

Medium-Low Sharpness
(S = 49.62%)

high-sharpness-49.62-graticule
berries-low-sharpness

Low Sharpness
(S = 18.02%)

low-sharpness-18.02-graticule

Anisotropic Sharpness. Only available with Rhopoint ID-L version.

A material can often exhibit optical effects which are directional. These phenomena are often induced in plastic parts by specific processing faults.

Visible texture is a common feature of plastic films and causes a significant reduction in their see- through quality.

Directional Effects

The Rhopoint ID is the only instrument that can measure directional effects in materials using the ID laboratory analysis software.

The images to the right show the visual impact of different ID Sharpness (S) values in vertical and horizontal directions.

Measuring directional effects can be used in advanced optical quality control and for adjusting processing parameters to obtain optimal transparency.

berries-anistrophic-horizontal

Horizontal

SV = 95%
SH = 70%

sharpness 99.86 horizontal blur
berries-anistrophic-vertical

Vertical

SV = 80%
SH = 95%

sharpness 99.86 vertical blur

Visible Transmittance

In consumer applications, it is essential to quantify how haze is transmitted to the human eye rather than how it is absorbed within the material.

id-front
id-diagram

Visible Transmission to human observer

  • Rhopoint Transmittance (TID) quantifies the amount of light passing through the material and reaching the camera/eye of the observer.
  • This measurement describes the brightness/ luminosity of the viewed object and is correlated to how one perceives the quality of the material.
Transmission-diagram
Visible Transmittance<br />96%
Visible Transmittance
96%
Visible Transmittance<br />56%
Visible Transmittance
56%

Applications

The Rhopoint ID is designed to measure transparent materials including the following applications.

film

Films

Analyse surface roughness and bulk irregularities of packaging films. Optimise distance related see- through quality.

car-windscreen

Windscreens

Analyse wiper wear resistance (wiper resistance test - ISO 12-103-1 A4) on automotive windscreen glass.

mobile-phone

Mobile phones

Measure the optical quality of display films and glass.

plastic-bottles

PET Bottles

Analyse wiper wear resistance (wiper resistance test - ISO 12-103-1 A4) on automotive windscreen glass.

Rhopoint-ID-new-screen-side-view
phone-film

Display films

Quantify the transparency of display films. Detect local defects.

sanitiser-gel-bottle

Liquids, gels and pastes

Safely quantify the transparency of liquid and semi- liquid materials.

tuppleware-box

Rigid plastics

Evaluate and optimise the use of clarifying additives in polypropylene packaging and containers.

detergent-bottle

Recycled materials

Ensure the quality of recycled materials in new products meets accepted standards for transparency.

Instrument features

The Rhopoint ID has been designed to measure samples for haze, transmittance and sharpness quickly and safely.

icon-solid-state

No moving parts

Eliminates risk of mechanical failure

icon-small

Stand-alone instrument

Small footprint reduces space required in laboratory

id-front-no-spacer

Touch screen

Single measurement time of 2 seconds to measure ALL parameters (up to 15 seconds on a comparable sphere instrument)

Large mounting area

Minimal sample preparation required possible to measure non flat samples without bending or deforming.

Fully sealed optics

Ideal for measuring liquid samples and solid materials impervious to damage through accidental spillage

icon-lightweight

Lightweight

Easy to move in the laboratory or production line

icon-durable

Resistant and durable

Made from durable, recyclable materials

id-live-view

Live view makes it easy to position test sample and locate specific areas of interest

Detailed analysis software

The Rhopoint ID-L analysis software enables detailed visual analysis of the sample using LIVE VIEW. Statistical analysis of multiple test results is shown for each measured parameter.

  • Saves all the results as a CSV file
  • Imports previous CSV results
  • Saves CSV results and all images as tiff
  • Imports CSV results and image tiff files
Production
Production
Laboratory
Laboratory
Research
Research

Rhopoint ID Options

The Rhopoint ID is available in two variants for laboratory or production use.

ID-E ID-L
Measure Haze, Transmission and Sharpness
Operate in stand-alone mode
Suitable for sheeted materials up to 300μm thickness
Measure (ID) with the sample material in contact with test target
Measure any planar material with thickness up to several mm
Measure non contact distance haze and transmittance up to 40mm
Detailed analysis software -
Anisotropic Sharpness measurement -
Live view makes it easy to position test sample and locate specific areas of interest -

Rhopoint ID-L Optional Accessories

id-front

Surface Roughness Adaptor

The Surface Roughness Adaptor allows the roughness of the film on each side to be isolated and measured without submersing the material in oil.

Abrasion Adaptor

Allows Taber abraded samples to be mounted on the Rhopoint ID. Results are highly correlated to ASTM D1044.

20mm Distance Haze Pack

Spacers for distance dependency haze measurement.

  • 2 x 5mm spacers.
  • 5 x 2mm spacers.
  • 2 packs of spacers can be combined for a 40mm distance.
  • Custom spacers are available.

Specifications

Measurement Specification Haze Measurement Specification Transmittance Measurement Specification Sharpness
Range 0-100% 0-100% 0-100%
Repeatability 0.05 SD 0.05 SD 0.05
Reproducibility 0.10 SD 0.10 SD 1.0
Resolution 0.01 0.1 Resolution - 0.1
Effective operating range Materials T > 50% Materials T>50%
ID-E ID-L
Measurement Mode Contact and Non Contact Contact and Non Contact
Non Contact Distance Up to 40mm Up to 40mm
Material Thickness <30mm <30mm
Software N/A Rhopoint ID-Analysis
Connection N/A Ethernet LAN
Spatial Resolution 12μm
Imaged Area 20mm x 20mm
Minimum measurement area (Haze, Sharpness) 12x8mm 6x2mm
Minimum measurement area (Transmittance) 12x8mm 2x2mm
Image Format N/A 16 Bit Tiff
Image Sensor Size N/A 1280x1024
Operating Temperature 10-40°C
Dimensions h x Ø 470 x 125 mm
Weight 3.95 Kg
Packed Weight 6.7 Kg
Power 110/230V
Product Included accessories Order code
Rhopoint ID-L 1 x USB drive (contains software / manual ) • 1 x checking standard • 1 x calibration certificate 1 x 8mm spacer (ASTM) • 1 x 5mm spacer • 1x LAN cable and 1x USB2 to LAN adaptor A3100-001
Rhopoint ID-E 1 x checking standard • 1 x calibration certificate • 1 x 8mm spacer (ASTM) • 1 x 5mm spacer A3100-002
Optional accessories for ID-L Order code
Abrasion adaptor B3100-002
Surface roughness adaptor B3100-003
20mm distance haze pack B3100-001

Try before you buy

We offer two options for you to try out the Rhopoint ID before buying.

Online demonstration: Online presentation of the Rhopoint ID with your samples measured LIVE on Zoom, TEAMS or Skype. Includes consultation with an application specialist.

Factory sample testing: Send in samples of your material for testing and receive a comprehensive test report.