| 摘要 |
FIELD: physics. ^ SUBSTANCE: device which is in form of a flow-measuring probe (1) has: a propeller (2) which is connected to a modulator (3), a fibre-optic system (4) for directing a beam IB from a laser source (41) to the modulator and for receiving the modulated return beam RB from the modulator and directing it to a detector (42) for conversion to an electrical signal. The modulator (3) has a coder (30) with at least a first corner sector, a second corner sector and a third corner sector, each having a defined attenuation coefficient such that the modulated signal contains at least a first part (64), a second part (65) and a third part (66) during each complete rotation of the coder. The device (1) also has an electronic circuit (5) with a microprocessor (6) for determining the flow speed and direction FF of the fluid based on at least the first (64), second (65) and third (66) parts of the modulated signal. ^ EFFECT: invention increases measurement accuracy at high pressure and high temperature and the device is compact. ^ 12 cl, 10 dwg |
