Development and Field Test of a Portable Camera System for Long Term Observation of Natural Dam Ken AKIYAMA (Tohoku Univ.), Genki YAMAUCHI (Tohoku Univ.), Shoya HIGA (Tohoku Univ.), Keiji NAGATANI (Tohoku Univ.), Kazuya YOSHIDA (Tohoku Univ.) Abstract A natural dam is sometimes built up when rivers are dammed by landslides caused by typhoon, hard rain, or earthquakes. In case that the dam failure, downstream area gets severe damage. Therefore, it is important for inhabitants to give them an alarm by observation of the dam continuously. However, it is difficult for human to approach such a natural dam typically. So, we developed a portable camera system to observe a natural dam from remote area. In this paper, we explain the camera system and report a result of long term observation test using the system. 1 2011 21 [1] 2011 9 12 17 [2] Fig. 112 Fig. 1: Akatani natural dam (Gozyo City Nara Pref, c Ministry of Land, Infrastructure, Transport and Tourism : MLIT) Fig. 2: Observation system of natural dam [3] 2 Fig. 2 [3] [4] Fig. 3 PTZ Pan-Tilt-Zoom
Fig. 4: FOMA module UM02-KO ( c NTT docomo) Fig. 3: PTZ-camera and observation camera system 1. 2. 3. 4. 2.4GHz LAN 3 3.1 1 2.4GHz LAN [5] docomo FOMA Fig. 4 RTA827L-2-SMAP AXIS P5522-E PTZ Fig. 3 Table 1 24 SH2/7144 FOMA PTZ PC ALIX.3c3, AMD 500MHz PC FOMA PTZ 15W 4W 16W1 3 1 (15+4+16) 3/60 = 1.75 Wh 6 612 30 1 1 24 1 42Wh24 1 24Wh1 66Wh 1 Q sys V B D K W B Table 1: Specification of network camera AXIS P5522-E PTZ Pan 360 deg, 0.2 deg 200 deg/s Tilt 180 deg, 0.2 deg 200 deg/s Zoom 18 optical zoom, 12 digital zoom Total 216 zoom Resolutions 720 480
)20$õñõžöîöòò óóö îöòò óóö ôöïöðžñ >PP@ óòòö 3& ôïðö )20$õñõžö >PP@ >PP@ Fig. 5: Prototype of an observation camera system Fig. 7: Portable observation camera system óóö îöòò ôöïöðžñ )20$õñõžö 3R( Fig. A photo taken by a prototype 0337 õñõžö óòòö ôïðö 3& W B = Q sysk V B D 1 66Wh 12V3 50% 33Ah 12V 36Ah 1 Q sys 1 A η P solar P solar = Q sys ηa (1) (2) 1 3.3 [6] 1 66Wh 0.7 28.6W 3.2 Fig. 5 Fig. 8: Control system of a portable camera system PC FOMA PTZFOMA 28.6W 20W SJS20 1 2012 6 10 10 6 6 30 1 1 12 Fig. 6 FOMA HTTP [7] 3.3 Fig. 7 Fig. 8 1440mm 800mm 1000mm 40kg
û ú ïõõ ôïöò Fig. 10: Asama Field test at Katafuta river to observe Mt. Fig. 9: Database of photos taken by a portable camera system (http://astro.frontier2012.live-on.net/) 40WKC40TJ Fig. 824 ON/OFF 1. PC FOMA PTZ ON 2. PC NTP 3. PC 4. PC HTTP 5. 6. PC PTZ 7. PC FOMA HTTP 8. PC FOMA PTZ OFF 9. PC FOMA PELICAN TM Fig. 8 MPPT Maximum Power Point Tracking IW1608-AL 1 2012 6 29 7 9 8 3 8 29 6 615 1 1 48 1 12 Fig. 9 4 2012 9 5 10 12 Fig. 10 5km 2012 10 12Fig. 11 Fig. 11 1783 6 61 4 1 12 Fig. 12 Fig. 12 6 6 9 23 1Fig. 12 14V 9 30 10 1 17 10 1
Fig. 11: Photos taken by a portable camera system at Katafuta river (2012/10/12 7:49 AM) Fig. 12: Power status of solar panel (AM 00 - PM 00)
5 FOMA PTZ 1 2kg [1] http://www.data.jma.go.jp/fcd/yoho/typhoon/ [2] 2312 2011-12 [3] 5 2011-12 [4] 4124 2008-12 [5] 12 pp.54-57 2011-12 [6] http://www.etech-japan.com/susume/ [7] http://astro.frontier2012.live-on.net/