Title:
ACOUSTIC CONDUIT LENGTH METER
Document Type and Number:
Japanese Patent JPH04297815
Kind Code:
A
Abstract:
PURPOSE:To measure the length of conduit accurately regardless of the type or temperature of gas passing through the conduit. CONSTITUTION:A conduit length meter measures the length of a tubular member 28 by transmitting a pulse sound from a speaker 25 disposed at one end of the tubular member 28, receiving the pulse sound reflected on the other end thereof by means of a microphone 26 and then executing an operation based on the relationship between the propagation time and the sound speed. Sound speed data at a reference temperature are stored for various type of gases passing through the tubular member 28. On the other hand, temperature of gas in the tubular member 28 is detected and the sound speed at the temperature of measuring time is operated using sound speed data corresponding to the type of gas and then the length of the tubular member 28 is calculated based on thus operated sound speed and propagation time.
Inventors:
NAKAMURA HIROSHI
ITO TAKANORI
NATORI MASAKI
ITO TAKANORI
NATORI MASAKI
Application Number:
JP8792191A
Publication Date:
October 21, 1992
Filing Date:
March 27, 1991
Export Citation:
Assignee:
TOKYO GAS CO LTD
International Classes:
G01B17/00; G01S15/88; (IPC1-7): G01B17/00; G01S15/88
Domestic Patent References:
| JPH0438415A | 1992-02-07 |
Attorney, Agent or Firm:
Hiroo Suzuki