Transcript Geo-Sensing Lab

SocDic Conference
Long-Term Operation of Landslide
Observation System Using ZigBee Modules
University of Tsukuba
Geo-Sensing Lab
Wang Rui
Contents
1
2
Geo-Sensing Lab
About landslide
Landslide observation system
3
About ZigBee
4
Our new system
5
Conclusion
About landslide
Geo-Sensing Lab
What is landslide?
A landslide is a geological phenomenon that rocks, earth, or
debris flows on slopes due to gravity. Landslide can occur in any
kind of terrain given the right conditions of soil, moisture and the
angle of slope.
Fig1. El Salvador.2001
About landslide
Geo-Sensing Lab
Landslide in Japan and Indonesia
West Java, 2010
Landslide in Japan
Landslide observation System is
western Sumatra , 2009
very important and strongly needed
Fig2. Landslide in Indonesia and Japan
Landslide observation System Geo-Sensing Lab
Function of the Landslide observation System
Landslide
monitoring
Landslide
observation
system
Effective measures for
landslide.
Necessary to measure before
occurring landslide.
Target of measurement




Landslide
warning
Displacement surface of the ground
Displacement in the ground
Water level in the ground
Amount of rainfall
Landslide observation System Geo-Sensing Lab
Current landslide observation system
Wired system
Wireless system
Fig4. Wireless monitoring system

Fig3. Wired monitoring system

wired observation system
→ breaking of wire
→ high-cost
other wireless standards
→ narrow observation area
→ Power is problem
→ If many nodes, high cost
Landslide observation System Geo-Sensing Lab
Our system
Based on ZigBee technology
Clinometers
Buried Clinometers
ZigBee
Advantage

Water Gauge
Fig5. Landslide observation system
using ZigBee
Fast installation(no drilling is necessary)
 Higher stability(no cables break)
 Data transmission is real-time
 Permanent data transmission and data collection
 Power saving(ZigBee device sleeping mode)
About ZigBee
Geo-Sensing Lab
What is ZigBee ?
ZigBee is a Ad-hoc networking technology
Based On IEEE 802.15.4 standard
Intended for 2.45 GHz , 868 MHz and 915 MHz Band.
Low in cost ,complexity & power consumption
Data rates touch 250Kbps for 2.45Ghz, 40 Kbps 915Mhz and
20Kbps for 868Mhz band.
Advantage




Network capacity
Low power consumption
Low cost
Bought freely
Fig6. ZigBee device
About ZigBee
Name
Communication
distance
Communication
speed
Network capacity
life
Application
Geo-Sensing Lab
Wi-Fi
Bluetooth
ZigBee
100m
10m
10～100m
11Mbps
1Mbps
250Kbps
32nodes
Several
hours
Wireless
LAN
7nodes
65,536nodes
Several months
Several days
or years
Instrumentation
Wireless Sound
control
Table1. Comparison with other wireless communication standards
Zigbee is especially suitable for instrument
measurement and control
Geo-Sensing Lab
About ZigBee
ZigBee Application
monitors
sensors
automation
control
INDUSTRIAL &
COMMERCIAL
PERSONAL
HEALTH CARE
consoles
portables
educational
ZigBee
CONSUMER
ELECTRONICS
LOW DATA-RATE
RADIO DEVICES
TOYS &
GAMES
HOME
AUTOMATION
TV
VCR
DVD/CD
remote
PC &
PERIPHERALS
security
HVAC
lighting
closures
Geo-Sensing Lab
About ZigBee
ZigBee Flexible network topology
Star
Cluster tree
RFD
Coodinator
FFD
FFD
RFD
wireless
wireless
Mesh
FFD
wireless
Fig7. Network topology
Our new system
Geo-Sensing Lab
network topology : mesh
Fig8. working process
Fig9. Network of our system
Our new system
System component
Geo-Sensing Lab
GeoSense
coodinator
EtherNet

GeoSense:
a.
c.
Network operations
Communicate external device
State transition

GeoSense Coordinator:
Fig9. Outline of system
a.
GeoSense Coordinator
b.
Formation of networks
Control GeoSense

AirSenseWare (software):
a.
Control GeoSense Coordinator
Monitor network
Collect and record data
b.
b.
c.
AirSenseWare
Zigbee NetWork
GeoSense
Measeument
Device
Sirial
communication
GeoSense
Fig10. GeoSense
Our new system
Geo-Sensing Lab
Problem using mesh network
To work as ZigBee-Router, loss of original power-saving
Improve Power-Saving of ZigBee is important for this study
GeoSense Coordinator
GeoSense
Fig10. GeoSense
Normal ZigBee device：
can not be set into sleeping mode when
using mesh network
Our laboratory’s ZigBee device(GeoSense)：
can be set into sleeping mode when
using mesh network
Our ZigBee system’s working time is much longer.
Geo-Sensing Lab
Our new system
Experiment of Small-Scale System
System component




AirSense Ware (1)
GeoSense Coodinator (1)
GeoSense (4)
GeoSense with external
measurement device(1)
Network topology
 Mesh topology
GeoSense
GeoSense
coodinator
MicroComputer
Sirial
Comunication
thermocouple
External measurement
device
wireless
EtherNet
Fig12. Experiment network
Fig11. Small-scale system
AirSenseWare
Our new system
Humidity sensor
GeoSense
Geo-Sensing Lab
Illuminometer Temperature sensor
Serial communication connector
Triaxial accelerometer
H8-3052
Fig13. Implementation and equipment of landslide observation system
Get environment data
 Temperature ,water
level , slope
Measurement time
 A day
Number of measurement
 72 times
Case
Geo-Sensing Lab
Our new system
170
171
175
0.4
加速度_Y [mN]
加速度_X [mN]
0.4
0.2
0.0
-0.2
170
171
175
0.6
0.2
0.0
-0.2
-0.4
-0.4
-0.6
-0.6
170
171
175
5
4
加速度_Z [mN]
0.6
3
2
1
0
-1
-2
-3
-4
時間(HH:MM)
時間(HH:MM)
170
171
110
100
温度[℃]
相対湿度[%]
90
80
70
60
50
40
30
14:52
15:21
15:50
時間(HH:MM)
16:19
-5
14:52 15:21 15:50 16:19 16:48 17:16 17:45 18:14
14:52 15:21 15:50 16:19 16:48 17:16 17:45 18:14
時間(HH:MM)
170
171
アメダス
22
20
18
16
14
12
10
8
6
4
2
0
13:5514:2414:5215:2115:5016:1916:4817:1617:4518:1418:43
500
時間(HH:MM)
300
200
100
0
14:52 15:21 15:50 16:19 16:48 17:16 17:45 18:14
時間(HH:MM)
Fig14. Accumulated environmental data



170
171
175
400
照度[lx]
14:52 15:21 15:50 16:19 16:48 17:16 17:45 18:14
Measure three times per hour properly
Confirmed the power saving function works properly
Get various environment data ,such as temperature and water
level , slope , etc to change sensor
Our new system
Geo-Sensing Lab
Conclusion

Landslide observation system is very useful for both
Japan and Indonesia.

ZigBee is much suitable for Landslide observation
system

GeoSense can be set into sleeping mode when using
mesh network. It is more power-saving.

Many types of data can be obtained for landslide early
warning
Geo-Sensing Lab