VCCI Dayori No.67

EMC on the Internet (No.6)

Sensational Sensor!

Nobuhiko Tsunefuka

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A firework is one of the essential items that give poetic charm to the summer in Japan. At one firework ceremony, over thousands fireworks goes off. At the Sumida River firework festival, pyrotechnics of Soke Hanabi Kagiya (one of the most traditional fireworks producers) demonstrate 20,000 fireworks in one hour or so. The price of each fireworks ranges from 10,000 yen to 100,000 yen. Then, the total cost for such firework festival is estimated to be a few ten thousands yen to a few ten million yen considering the management fee, arrangement, security and cleaning of venue. Considering that it is only few seconds that a firework can be viewed, it seems to be very expensive. However, if we look from different perspective, a firework festival is not expensive. A large-scale firework festival could attract more than a million visitors, so a cost per person would be a few hundreds yen. Since many people can simultaneously appreciate fireworks as the art of light from all-round angles, it is rather cost-effective and great entertainment of summer that every viewer can enjoy.

• Variety of fireworks

http://event.yahoo.co.jp/docs/event/hanabi2002/inf/2.html
(In Japanese)

In the relayed TV program on a firework event, no matter how much commentators and guests try to make the program exciting, such program cannot convey the real excitement of fireworks. It must be because we don?ft use only eyes to appreciate fireworks but also use other sensors; skin to feel wind and ear to hear the sounds of shooting and voices of crowd. In this way, various sensors are used depending on purposes. Therefore, we have to be very sensitive about selecting an appropriate sensor.

Photo 1: Fireworks

 Top news of 2002 Japan?fs science and technology society is the double winning of the Novel Prize by Masatoshi Koshiba, emeritus of University of Tokyo and Koichi Tanaka, fellow of Shimazu Corp. Both winners?f study has something in common. That is sensing technology.

 Prof. Koshiba was awarded "for pioneering contributions to astrophysics, in particular for the detection of cosmic neutrinos".

 Prof. Koshiba group had constructed Kamiokande 1000-meter underground of Kamioka mine in 1983. Since then, the group has continued observation. In February 23, 1987, the supernova of Large Magellanic Clouds exploded and released neutrino. Then, 20 trillion x 10 to the 3rd power of neutrino arrived to the tank filled with pure water. Only 11 of neutrino crashed with electron in the water and led to aproton decay that created Cerenkov light. Kamiokande that is constructed with 1000 of 20-inch diameter photo multiplier tube detected this light. IMB (Irvine Michigan Brookhaven) group in the United States has received the message from Prof. Koshiba and confirmed 8 neutrinos at the same time. Kamiokande completed its mission in 1996. Now, super Kamiokande that facilitates over 10,000 photo multiplier tubes and 50,000 tons of water tank took over its mission.

Photo 2: Photo multiplier tube

 The Novel Prize was granted to Mr. Tanaka ?gfor the development of methods for identification and structure analyses of biological macromolecules?h. Actually, it is the development of matrix assisted laser desorption/ionization, MALDI. It is the mass spectrometry that applies a laser light to a test sample of biopolymer to softly ionize the sample for the analysis. The analysis of human genome was completed the first phase and we are entering the era of proteome. The opportunities that MALDI mass spectrometry is utilized will increase further.

• The announcement from the Novel Prize foundation for the Novel Prize for Physics 2002

http://www.nobel.se/physics/laureates/2002/index.html

http://www.nobel.se/physics/laureates/2002/press.html

• The announcement from the Novel Prize foundation for the Novel Prize for Chemistry 2002.

http://www.nobel.se/chemistry/laureates/2002/index.html

http://www.nobel.se/chemistry/laureates/2002/press.html

• Supernova neutrino

http://www.s.u-tokyo.ac.jp/koshiba/kaisetu.html
(In Japanese)

&ull;b Super Kamiokande

http://www-sk.icrr.u-tokyo.ac.jp/doc/sk/index.html

 • Photo multiplier tube(20 inch-diameter)

http://www.hpk.co.jp/Jpn/products/etd/kamiokaj/kamiokaj.htm
(In Japanese)

 With an antenna electromagnetic wave emitted from system and equipment is sensed at a measurement site that conforms to the standard and regulation. Moreover, there is a device that uses magnetic probe to visualize the amount of electromagnetic wave from circuit board and LSI. These measurement facilities and equipment are often large-scale and expensive. What is expected now is the arrival of EMC scope that can be used as easy as a kaleidoscope visualizing the condition of electromagnetic filed around equipment according to the setting of frequency, electric field and magnetic field.

 David Brewster of Scotland invented a kaleidoscope and submitted a patent in 1816. A document says only three years after the innovation, in 1819, it was brought to Japan and people started producing its copy product.

• Visualization of electromagnetic wave emission and transmission and electric wave hologram

http://club.pep.ne.jp/~kitayoshi/paph1.htm
(In Japanese)

• Sir David Brewster

http://www.brewstersociety.com/brewster_bio.html

• Kaleidoscope in Japan

http://kaleido-japan.com/link/link1.shtml
(In Japanese)

• Kaleidoscope in the world

http://kaleido-japan.com/link/link2.shtml
(In Japanese)

 Because EMC is an important engineering technology wherethe emitted and transmitted noise from the circuit and equipment is decreased and the immunity of the circuit and equipment against the electromagnetic wave is improved, I hope that EMC researchers would make brilliant achievement that deserves the Novel Prize.

 

Nobuhiko Tsunefuka 1943 Born in Tokyo 1968 Graduated form Department of Engineering Science, Osaka University -1984 Worked on developing Information Technology Device at Taga Works, Hitachi, ltd. 1991- Engaged in education on EMC related matters at Hitachi Institute of Technology 1999- Planning Manager,