UiPath Platform: The Backend Engine Powering Your Automation - Session 1
RuBee in Underground Coal Mines
1. RUBEE IN UNDERGROUND COAL
MINES
by:
Subhash Kumar*, P. K. Mishra, P. K. Mandal and A.
Kushwaha
CSIR-Central Institute of Mining and Fuel Research
Barwa Road, Dhanbad, Jharkhand -826015
2. WHAT IS RUBEE?
RuBee or P1902.1 is an on-demand, Bidirectional, peerto-peer network protocol that uses long wavelength
(under 450 kHz) transceiver mode.
The protocol is similar to WiFi (IEEE 802.11), ZigBee
(IEEE 802.15.4) and Bluetooth (IEEE 802.15).
It relies on low-frequency magnetic waves to track
products and transfer information, therefore, also called
LFID.
It excels in situation where RFID has limitations.
3. RUBEE VS RFID
RFID (IEEE 802.15.4)
RuBee (IEEE P 1902.1)
Signal Type
RF (EM) type
Magnetic type
Frequency
High and Ultra High
Low Frequency(<450kHz)
Read Speed (tags per sec)
100-200
6-10
Battery Life
1-4 years
More than 10 years
Range
1-100 m
1-20 m
Bandwidth
20-150 Kbps
Small
Data Storage Capacity
4 -32KB
5KB
Network Size (Nodes)
64,000
8
Security
Low
High
Node Cost
$0.05-$4
$0.1-$10
Base Station Cost
$500-$1,500
$1 - $200
7. BURIED OBJECTS DETECTION
In case of ROOF FALL, the mine machinery
goes underneath the coal. To detect their
location is a challenge.
This problem can be mitigated by attaching
these equipments with RuBee tags.
10. TRAPPED MINERS TRACING
A RuBee tag can be installed in the miner’s
caplamp; in case of accidents such as
STRATA FAILURE/FLOODING the miner’s
position can be easily traced.
13. DETECTION OF MISFIRE
In case of BLASTING, some explosives may
remain misfired.
If prior to BLASTING, RuBee tags are
attached with the explosives, the misfired
can be detected.
17. MAJOR CONCERNS OF RUBEE TO
IMPLEMENT IN UG MINES…
Design of a feasible and compatible antenna for low
frequency.
Microstrip Patch Antenna
18. MAJOR CONCERNS OF RUBEE TO
IMPLEMENT IN UG MINES…
Design of feasible and compatible antenna for low
frequency.
The readability of RuBee can be affected by the relative
position and orientation of the tag and the reader
antenna
RuBee protocol have to use anti-collision mechanism
Slow read rate (6-10 per second)
Shorter range
19. CONCLUDING REMARKS…
RuBee is not a replacement of RFID; it is
actually an alternative.
RuBee tag radiates very low power ( 40
nW) which is within the safety limit of
power rating for explosives.
The RuBee tags also satisfy the safety
rules of IEC 60079-0.
20. REFERENCES…
Accenture White Paper, 2001. Radio Frequency
Identification (RFID), White Paper.
August, J., Waterhouse, P., Stevens, J.
K., Vandenberg, M. L., Truong, K., 2007. Low
frequency tag and system, US Patent Application:
20070063895.
Bandyopadhyay, L. K., Chaulya, S. K. and Mishra, P.
K., 2010. Wireless Communication in Underground
Mines: RFID–based Sensor Networking, Springer.
Bolic, Miodrag (Editor), Simplot-Ryl, David (CoEditor), Stojmenovic, Ivan (Co-Editor), 2010. RFID
Systems: Research Trends and Challenges, Wiley.
21. CONTD…
Brown, W. C., 1984. The history of power transmission
by radio waves, IEEE on Microwave theory and
Technique, Vol. 32, No. 9, pp. 1230-1242.
Finkenzeller, K., 2003. RFID Handbook—Fundamentals
and Applications in Contactless Smart Cards and
Identification, second ed. Wiley, New York.
http://en.wikipedia.org/wiki/RuBee#RuBee_tag_details.
Accessed on 01-01-2013.
Landt, J., 2005. The history of RFID, IEEE potentials,
Vol. 24, No. 4, pp. 8-11.
Mishra, P. K., Bolic M., Yagoub, M. C. E. and Stewart, R.
F., 2012. RFID Technology for Tracking and Tracing
Explosives and Detonators in Mining Services
Applications, Journal of Applied Geophysics, Vol. 76,
pp.-33-43.
22. CONTD…
Nogee, A., 2004. RFID Tags and Chip: Changing the
World for Less than the Price of a Cup of Coffee. InStat/MDR.
Oracle & Visible Assets Inc., 2010. An introduction to
RuBee Technology, White Paper.
http://www.rubee.com/Partners/Oracle/RuBee%20White
%20Paper%20-%20v3.pdf. accessed on March 24,
2010.
Schuman, E., 2006. RuBee Offers an Alternative to
RFID.
Waterhouse, P., Verge, C. W., Vandenberg, M. L.,
Truong, K. , Stevens, J. K., August, J., 2006. Networked
RF tag for tracking freight, US Patent no.: 7049963.
Wyld, D. C., 2005. RFID: The right frequency for
Government, IBM Center for the Business of
24. FINDINGS…
RuBee is not a replacement of RFID; it is actually an
alternative.
Because RuBee uses such a low frequency it does not
consume much power and has a 5-years to 15-years
battery life using simple Lithium coin-size batteries
with a range of 1″ to 50 feet.
RuBee tags overcome many of the technological
problems seen with RF near steel and water.
RuBee is safe and cost effective as the power
consumption is very less.
Due to low frequency, penetration of obstructing materials (specially coal seams, metals, water) is relatively high. From wave theory, δ ∝ 1/f ; where δ=depth of penetration, f=frequency of wave Due to Inductive Coupling in RuBee technology i.e. energy transmission between tags and reader is in form of Magnetic Field, the chances of misfire become too low… with an added advantage of low frequency it becomes too secure.The explosive can be attached with RuBee tags. when the blasting takes place, most of the detonators will burstbut some of the detonators, which remains unfired, send the signal to the RuBee reader by acknowledging the operators about their locations.
As RuBee works at Low Frequency, and from wave theory length of antenna=λ/4 where λ= Wavelength of signal used This problem can be mitigated using micro strip patch antenna; in which an array of antennas are used, to over electric field problem LC oscillator is used. length of patch antenna L=λ/2(є)^(1/2)Advantages of Microstrip AntennasLow profile (can even be “conformal”).Easy to fabricate (use etching and phototlithography).Easy to feed (coaxial cable, microstrip line, etc.) .Easy to use in an array or incorporate with other microstrip circuit elements.Patterns are somewhat hemispherical, with a moderate directivity (about 6-8 dB is typical).Disadvantages of Microstrip AntennasLow bandwidth (but can be improved by a variety of techniques). Bandwidths of a few percent are typical. Bandwidth is roughly proportional to the substrate thickness. Efficiency may be lower than with other antennas. Efficiency is limited by conductor and dielectric losses*, and by surface-wave loss**.* Conductor and dielectric losses become more severe for thinner substrates.** Surface-wave losses become more severe for thicker substrates (unless air or foam is used).
Because antenna orientation affects power pattern of the signal.To prevent the collision interference of the signals coming from different tags simultaneously.
From wave theory, energy of wave, E ∝ f where f=frequency of signal usedIEC : International Electrotechnical Commission, HQ - GenevaIEC 60079 Parts 1–14 Electrical Installations in Hazardous AreasIEC 60079-0:2011 specifies the general requirements for construction, testing and marking of electrical equipment and Ex Components intended for use in explosive atmospheres.The standard atmospheric conditions (relating to the explosion characteristics of the atmosphere) under which it may be assumed that electrical equipment can be operated are:- temperature -20 °C to +60 °C;- pressure 80 kPa (0,8 bar) to 110 kPa (1,1 bar); and- air with normal oxygen content, typically 21 % v/v.