Product information LensColour Analyser TFM-10 pages

LensColour Analyser TFM-1
The TFM-1 acquires the spectral characteristics
of ophthalmic lenses with refractive power of up
to ± 20 diopters. The lens transmission is measured over the wavelength range of 280 to 780nm.
The colour values L*a*b*, the UV transmission
TUV 380nm and TUV 400nm and the light transmis-

sion TV are determined in accordance with the
DIN EN ISO 8980-3 standard. Furthermore, the
values are displayed and saved to a database.
The system was developed in cooperation with
Rodenstock GmbH, Munich, Germany.

To obtain the transmission values with the necessary
accuracy,
a
second
spectrometer
module
simultaneously measures the optical power of each
individual flash, for perfect referencing.
The operation of the measurement system as well as
the transmission of the acquired data to a host computer is done via a USB interface.

Application Software
The included software is transparent in structure and
easy to use.
LensColour Analyser TFM-1

Applications

The software controls the measurement procedure,
processes the acquired spectral data, displays the
results graphically and numerically, and archives the
measured values.

The LensColour Analyser TFM-1 was designed and
developed for the use in dye bath development, in
production of lenses for stock, and in realization for
customer specific ophthalmic sunglasses.
The transmission of other optical components e.g.
filters can be measured of course, as well.

Instrument Hardware
The main parts of the TFM-1 are the illumination unit,
the sample holder, and the optical receiver unit. The
sample holder is easily accessible at the front side of
the instrument. Lens with diameters of 30 to 100mm
and various refractive powers fit into the same holder
for simplified handling.
A Xenon flash lamp with very high lifetime and a wide
spectral range is used for illumination. Special optics
form a quasi parallel light beam, 8mm in diameter, to
acquire data over a relatively large spot.
The transmitted light is detected by means of a highgrade spectrometer module from Carl Zeiss. Due to
their robust design, these devices provide an
outstanding reproducibility; no recalibration of the
wavelength scale is required.

User interface TFM-1 software
Two user levels are available:
The first - general user - level allows the performance
of all necessary measurement procedures.
The second - administrator - level is secured by
password and allows to set and/or change
parameters for the measurement procedure
respectively to control the principal funtions of the
system.