| 摘要 |
PROBLEM TO BE SOLVED: To search the state on the inner surface of a pipe or a cylinder without touching and to display that state while developing and reproducing planarly by transmitting light received at a forward end light receiving part to a photoelectric conversion display section through a rear end light transmitting section and converting variation of light photoelectrically. SOLUTION: The display comprises a forward end light receiving part 7 annularly arranged with a light source and a large number of optical fiber 6, and a light regulator 5. Immediately before the display moves through a pipe 1 to be searched, the light from the light source and the light regulator 5 reflected on the inner surface of a pipe 1 is received at the forward end light receiving part 7 in order to search the state on the inner surface as the variation of light. The display 3 comprises a rear end light transmitting section 8 arranged with optical fibers 6 in rows, and a photoelectric conversion display section 9 connected therewith through a cable 12. The rear end light transmitting section 8 receives the light, received at annularly arranged forward ends 6a, through the optical fibers 6 and delivers an amplified light signal to the photoelectric conversion display section 9 through the cable 12. The photoelectric conversion display section 9 converts the received signal and displays a visible image on a Braun tube.
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