Method and apparatus for detecting magnetostrictive resonator and traffic system
First Claim
1. A detecting method for a magnetostrictive resonator, comprising the steps of:
- a) inactivating a reception section while transmitting an electromagnetic wave at a frequency for generating an intrinsic mechanical resonance to the magnetostrictive resonator,b) activating the reception section after stopping transmission of said electromagnetic wave, andc) detecting the electromagnetic wave radiated by said magnetostrictive resonator resonating mechanically.
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Abstract
While transmitting an electromagnetic wave from a transmitting antenna to, for example, a magnetostrictive resonator, buried in a road, a reception section composed of a reception amplifier and signal processor is inactivated. After stopping transmission of the electromagnetic wave, the reception section is activated and a receiving antenna detects an electromagnetic wave radiated by the magnetostrictive resonator. In this method, a magnetostrictive resonator detection apparatus having a sufficient directivity and detection distance can be presented. The magnetostrictive resonator detection apparatus applying this detecting method is mounted aboard a vehicle, and a plurality of magnetostrictive resonators are buried in the road. By sequentially transmitting and receiving electromagnetic waves at different resonance frequencies thereof, and judging the configuration of the road and the vehicle, a safe traffic system is presented.
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Citations
21 Claims
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1. A detecting method for a magnetostrictive resonator, comprising the steps of:
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a) inactivating a reception section while transmitting an electromagnetic wave at a frequency for generating an intrinsic mechanical resonance to the magnetostrictive resonator, b) activating the reception section after stopping transmission of said electromagnetic wave, and c) detecting the electromagnetic wave radiated by said magnetostrictive resonator resonating mechanically.
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2. A magnetostrictive resonator detection apparatus comprising:
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a transmission section for transmitting an electromagnetic wave at a frequency for generating an intrinsic mechanical resonance to a magnetostrictive resonator, and a reception section having a function of making said reception section inactive while said transmission section is transmitting the electromagnetic wave, and for detecting the electromagnetic wave radiated by said magnetostrictive resonator resonating mechanically after said transmission of said electromagnetic wave is stopped. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification