| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for measuring the distribution, etc., of electric field intensity in a room, etc., together with the coordinate position of the measuring points. SOLUTION: In a local area 1 of a building, etc., to be measured, a communication radio wave W1 from a PHS(personal handy-phone system) relay station 30 passes through an opening such as a window 20, etc., and enters its inside, forming an electric field therein. A plurality of speakers 41, 42, 43, and 44 for generating ultrasonic waves are placed within the local area 1 so as to generate synthesized ultrasonic waves S1 , S2 , S3 , and S4 . A mobile vehicle 100 for measurement is provided with an antenna 150 for receiving the communication radio waves and a microphone 160 for receiving the ultrasonic waves. The vehicle 100 receives and processes the synthesized individual ultrasonic signals, so that the coordinate of present position of the vehicle 100 can be ontained, and further a graph be also prepared together with the received electric field intensity. |
