Title:
MEASURING APPARATUS OF SHAPE OF INSIDE OF TUBE
Document Type and Number:
Japanese Patent JPS6450903
Kind Code:
A
Abstract:
PURPOSE:To know an uneven state of the inside of a tubular body and to enable the reproduction of the shape of the inside of the tubular body, by using a water distance measuring means to obtain data on water distance while driving transducers for transmitting and receiving ultrasonic waves which are arranged in the circumferential direction of a main body of pig. CONSTITUTION:A main body 1 of pig loaded with a measuring instrument measures the data on the shape of the inside of a tube while it runs by a pressure difference inside a tubular body 2. For this purpose, the distance of transfer of the main body 1 is measured by a range finder 11 and the rotational angle in the circumferential direction of the main body 1 inside the tubular body 2 is detected by an angle gage 12. A thickness gage 21, which is connected to each group of several transducers 6 for transmission and reception of ultrasonic waves provided in a plurality at prescribed intervals in the circumferential direction of the main body 1, transmits and receives ultrasonic waves while driving the transducers 6 and measures data on water distance to the inner surface of the tubular body 2. Based on a predetermined threshold value or the like as a reference, an encoder 24 selects these data and makes them recorded in a recorder 8. After the main body 1 is withdrawn, the data are read out of the recorder 8 and the shape of the inside of the tubular body 2 is restored by a method of interpolation.
Inventors:
SUGAYA NOBUTADA
KONDO MUNETAKA
MURASHITA KIKUJI
KOBAYASHI MOTOI
KONDO MUNETAKA
MURASHITA KIKUJI
KOBAYASHI MOTOI
Application Number:
JP20798187A
Publication Date:
February 27, 1989
Filing Date:
August 21, 1987
Export Citation:
Assignee:
NIPPON KOKAN KK
International Classes:
F17D5/00; G01B17/02; G01B17/04; G01B17/06; G01B17/08; G01N29/07; G01N29/26; G01N29/265; (IPC1-7): G01B17/02
Domestic Patent References:
| JPS6283608A | 1987-04-17 | |||
| JPS61107112A | 1986-05-26 | |||
| JPS6033005A | 1985-02-20 | |||
| JPS60213854A | 1985-10-26 | |||
| JPS6125534A | 1986-02-04 |
Attorney, Agent or Firm:
Takehiko Suzue