Hong Kong Council for Testing and Certification
(HKCTC), Hong Kong Metropolitan University (HKMU), Government Laboratory (GL) and
Standards and Calibration Laboratory of Innovation and Technology Commission
(SCL) jointly organized the online Metrology Symposium 2022 on 12th Aug
2022. The theme is “Metrology and
Everyday Life”. Hong Kong Society for Quality (HKSQ) was one of supporting
organizations. Precise measurement can provide a solid foundation for the
development of science and technology, thereby improving people's quality of
life. The seminar aimed to share some applications of metrology that are
closely related to our everyday life, and introduce the scientific principles
behind them.
In the beginning, Dr. Eric Sze on behalf of Prof. Reggie
Kwan (Provost, HKMU) to give welcoming address. Then Mr. Arthur Au (Deputy Commissioner
for Innovation & Technology) gave an opening remark. After that all guests
took a group photo.
The first speaker was Mr. Andrew AU (Electronics
Engineer, SCL) and his topic entitled “What Makes Our Phones So Smart in Motion
Detection?” Firstly, Mr. AU explained smartphone sensor that is a small device
or module that analyzes the conditions around it and sends them to the
processor in quantitative form. Smartphone sensors measure various aspects such
as ambient light, device orientation, movement, etc. Different smartphone sensors
frequency use table was discussed.
Then Mr. AU selected two sensors for detailed
discussion and they were Accelerometer (detect linear motion) and Gyroscope
(detect rotational motion). They are module using MEMS for smartphone and its
SEM photo was demonstrated.
Finally, he demonstrated the principle of MEMS
Gyroscope – Coriolis effect. Gyroscope or gyro sensor is a device which is
designed based on conservation of angular momentum, measures or maintains
orientation and angular velocity.
The second speaker was Dr. Boris WONG (Chemist, GL)
and her topic was “Chemical Metrology and Our Daily Life”. Firstly, Dr. WONG
briefed chemical measurement in our daily life including commodities, toys,
foods, environment, etc.
And then Dr. WONG mentioned three key elements for
reliable measurement and they are Metrological Traceability, Metrological
Comparability and Measurement Uncertainty.
The Metrological Traceability and Comparability were
explained that Traceability through dissemination of CRM and Comparability
through instrument and test method comparison. Finally, he explained Calibration
and Measurement Capabilities (CMC) and government laboratory is designated
institute (DI capability is equivalent to NMI).
The third speaker was Dr. Alvis AU-YEUNG (Electronics
Engineer, SCL) and his presentation named “A Vanishing Second”. In the
beginning, Mr. AU-YEUNG briefed the significant of time in our daily life
including cooking, sport competition, photography, etc. Then he told us the
definition of second.
After that he introduced universal time (UT) including
UT0, UT1 (small movement of the Earth correction) and UT2 (Seasonal effect).
Finally, Mr. AU-YEUNG explained the leap
second between TAI and UTC. If leap second is positive, they can correct it.
But they met difficulty for negative leap second. Some possible solutions
including vanished the second at 23:59:59 or 00:00:00; or adjust the frequency
of clock over some interval, or increase the tolerance in |UT1 - UTC| to a new
limit; or Ignore lead seconds.
During the break, a video of SCL
was showed.
Mr.
George TANG (Electrical and Mechanical Engineer, SCL) was the fourth speaker
and his topic was “Length Measurement in Our Daily Life”. Firstly, he briefed
the role of SCL is to disseminate the knowledge and techniques of metrology through
other customer services. Then he introduced
Light Detection And Ranging (LiDAR).
After that Mr. TANG demonstrated Laser
Distance Meter (LDM) using time of flight principle. SCL is only HOKLAS
accredited calibration laboratory provide LDM service up to 20m.
Finally, Mr. TANG said it is much crucial for the top
metrology institute/national metrology institute (NMI) to provide a correct measurement
value (with true uncertainty level). SCL got a very good results from the
international comparison.
Dr. Eric TP SZE (Associate Professor, OUHK) was the fifth
speaker and his presentation entitled “Measuring Microplastics in Hong Kong
Environmental Water Samples”. In the beginning, Dr. SZE mentioned the plastic
waste in Hong Kong in 2020.
Then he explained microplastic type including primary
and secondary microplastics both within the range from 1 um to 5 mm.
After that Dr. SZE introduced the methodology to
identify the microplastics in environmental waters and to quantify small
microplastics down to 1 um. Finally, he shared their research and found microplastics
in bottled water.
Mr. Cliff SH Wong (Electronics Engineer, SCL) was the
last speaker and his topic named “Metrological Information Infrastructure in
Digital Era”. He mentioned the CIPM to undertake the development and promotion
of an SI Digital Framework including digital representation of the SI, digital
certificates and FAIR principles.
Data’s FAIR principles were discussed and they are
Findable, Accessible, Interoperable and Reusable.
Finally, he introduced the SI digital framework and
demonstrated some architecture for explanation.
Q&A Session
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