Title:
ULTRASONIC METHOD FOR DETECTING GASEOUS PHASE APPEARING IN LIQUID PHASE IN CHAMBER
Document Type and Number:
Japanese Patent JP3041728
Kind Code:
B2
Abstract:
PURPOSE: To detect a gaseous phase which appears in a liquid phase in a chamber by detecting whole outlet signals of a liquid phase/chamber system and detecting the possible attenuation of the amplitude characteristic of the gaseous phase in the liquid phase by separating an effective part from the signals.
CONSTITUTION: A synchronous pulse generator 28 generates pulses 2 and 4. The pulses control a sine wave generator 30 at an ultrasonic frequency and generate wave trains 6 and 8. The wave trains are amplified by means of an amplifier 32 and excite a radiation transducer 34. The ultrasonic wave trains carried to the wall 22 of a steam generator 20 are collected by means of a waveguide 38 and a reception transducer 40. The received wave train IC is amplified 44 after pre-amplification 42. Received composite signals are filtrated to reduce background noise and shaped by means of a shaper 46. Synchronous detection which is delayed by time (t) by a window having a width Δt is synchronized to a synchronization generator 28 and a signal 1f is obtained at the outlet of a synchronous detector 48 and compared with an alarming threshold 18 at a comparator 50. When the peak of a signal 14 received by the comparator 50 is smaller than the threshold 18, the presence of a gaseous phase which attenuates the energy of the ultrasonic wave trains on an ultrasonic route can be inferred.
Inventors:
Pierre Garno
Linole De Mare
Linole De Mare
Application Number:
JP4459691A
Publication Date:
May 15, 2000
Filing Date:
January 24, 1991
Export Citation:
Assignee:
Komitsaria Talenergy Atomique
International Classes:
G01N29/00; G01N29/032; G21C17/025; G01N29/24; G01N29/34; G01N29/40; (IPC1-7): G21C17/025; G01N29/20
Domestic Patent References:
| JP62115358A | ||||
| JP5336295A |
Attorney, Agent or Firm:
Tadashi Hagino (3 outside)