| 摘要 |
1. Device for detecting particles, particularly solid particles, in a fluid and particularly in natural gas, flowing through a conduit (2) of a type comprising a shock sensor comprising a head (6, 30) subjected to bombardement by particles and which can be displaced within the conduit at the level of points which are to be monitored, the said sensor being provided with a transducer, for example of the piezo electric type, adapted to convert shock waves from the aforesaid particles into electrical signals which can be processed by an electronic processing circuit (50) which is supplied with constant current from a supply means (54) and, through the medium of an electrical connecting cable (51), linked to a fixed station (52), the electrical signals sent to the said station being frequency modulated with effect from the said electronic circuit, the said device being characterised in that the aforesaid electronic processing circuit (50) is entirely freely suspended within the said conduit, being mechanically associated with the said head (6, 30) and in that there is associated with the constant current supply means (54), from the fixed station, a control member (55) which makes it possible to modify the intensity threshold of the current in order, via a command to reverse a control unit (59), a switch-over relay (58) of a high-pass filter (57) comprising a plurality of switch-off frequencies making it possible to differentiate the frequencies of the signals emitted by the said transducer. |
