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AET60 Reference Manual
Version 1.7
Page 24 of 24
www.acs.com.hk
Appendix C. Recommended Device Cleaning
Procedures
Appendix C.1. Introduction
The key elements of image quality are the consistency within the actual image and the background of
the image. Software algorithms are more accurate and generally faster when the image quality is
consistent and the background has not changed dramatically. Dirty residue, oils, or other material on
the surface of the TouchChip may obscure the image, leaving parts of the image unrecognizable, or
creating false features within the image. Regular use of the TouchChip may leave residue or other
foreign materials on the surface. Performance degradation in terms of False Match and False Non-
Match are indicative of such problems.
It is recommended that the sensor be visually inspected and periodically cleaned as described in
section D.2. It is also recommended that before each touch, the sensor be cleaned as described in
section D.3.
Appendix C.2. Periodic Cleaning
Dampen a lint-free cloth or cotton swab with alcohol or acetone. Gently rub the cloth across the
sensor surface in a left and right direction. Move slowly down the sensor to cover the entire surface
area. Repeat this process 4 times. Visually observe that no residual solution remains on the sensor.
After performing the periodic cleaning operation, a surface conditioning is suggested to obtain the
maximum performance from the TouchChip sensor. Dampen a lint-free cloth with fragrance-free
moisturizing lotion, and gently rub the cloth across the sensor. Make sure that all the lotion will be
removed as completion of the cleaning process.
Acid-based fluids, and abrasive materials are not recommended for cleaning the TouchChip.
Appendix C.3. User Cleaning
Before each authentication, it is recommended that the user simply wipe the sensor with her/his
finger, and then position the finger for the authentication. With this action we assure that residue from
previous usage will be removed hence giving the best surface conditioning.
