Communications: electrical – Selective – System having rectifier
Patent
1977-09-02
1979-07-17
Queisser, Richard C.
Communications: electrical
Selective
System having rectifier
73149, 73627, 73643, 340 1R, 340 12R, G01S 170, G01F 1700, G01S 172
Patent
active
041617150
ABSTRACT:
An apparatus for measuring the interior dimensions of the walls of a hollow body. The apparatus is insertable into a restricted opening of the hollow body and includes means for transmitting a beam of electromagnetic energy toward an interior wall of the hollow body. When the electromagnetic energy illuminates the interior wall, acoustic waves are radiated back to the apparatus. The apparatus detects the acoustic waves and measures the elapsed time between transmission of the electromagnetic energy and detection of the acoustic waves. From elapsed time measurements the dimensions of the interior walls are obtained.
REFERENCES:
patent: 2595241 (1952-05-01), Goble
patent: 3049920 (1962-08-01), Allen
R. M. White, Generation of Elastic Waves by Transient Surface Heating, Journal of Applied Physics, vol. 34, No. 12, Dec. 1963, pp. 3559-3567.
P. M. Griffen et al., Development and Evaluation of an Ultrasonic Imaging System, G.E. Co., Publ. Report # N01-Hv-5-2966-1, Mar. 31, 1976, pp. 1, 2, 17 & 45.
M. Bruma et al., Quelques Experiences Relatant L'induction D'iondes Acoustiques, etc., Le Journal De Physique, Jun. 26, 1965, pp. 341-344.
Beauchamp John P.
Electric Power Research Institute Inc.
Queisser Richard C.
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