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About the Rhopoint ID Imaging Transmission Appearance Meter
The Rhopoint ID Imaging Transmission Appearance Meter (IDTX) quantifies the
transmission appearance of transparent, semi-transparent and translucent samples
such as plastic, films, glass and liquids.
The instrument uses a high specification camera to take images of a specially
designed target graticule through the sample to be analysed.
These images are analysed using digital imaging techniques to quantify the
appearance qualities of the material in metrics that are highly correlated to human
visual perception.
The images can then be analysed using the optional viewer software to compare the
transmission characteristics of materials in conditions that replicate the final use of the
material.
Uniquely the instrument can quantify the see-through quality of a sample in contact
with an object or at variable viewing distances up to 45mm.
The instrument is supplied in 2 formats-
IDTX-E: a stand-alone, low cost instrument designed for the QA environments.
IDTX-L: a laboratory instrument with additional software for R&D environments.
Measurements made with the IDTX-E & IDTX-L are identical.
IDTX-E instruments can be upgraded at any time to IDTX-L version.
Measurement Technology
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.
A sample placed in direct contact (or at the desired separation) with the graticule is
photographically imaged and analysed to quantify the reduction in sharpness of the
backlit-to-masked (i.e. light-to-dark) transitions of the graticule compared with its
reference image.
At a separation distance of 7.86mm (referred to as 8mm) the instrument measures
transmission haze by calculating the reduction of contrast in black and white areas of
the target graticule
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