[introduction]Turbine flowmeter already had history of more than 50 years in the application on industry, it is passed inside magnetism type sensor detects the rotate speed of turbine and implementation discharge is measured, it is a kind of discharge with extensive use measures meter.

Turbine flowmeter already had history of more than 50 years in the application on industry, it is passed inside magnetism type sensor detects the rotate speed of turbine and implementation discharge is measured, it is a kind of discharge with extensive use measures meter.

Turbine type flow transducer uses the rotate speed of the impeller that is put in the fluid to undertake discharge checks, if pursue 3, 27 are shown. The lamina of impeller can be used guide magnetism material is made, by the magnet inside magnetism cable converter, core, coil and impeller blades 2 form magnetic circuit, when blade rotates, magnetoresistive will produce periodic change, make the induction in coil gives voltage pulse signal thereby. This signal is outputted after classics enlarge, plastics, regard the pulse that for detecting rotate speed uses as signal.

Realize discharge to measure, it is a kind of discharge with extensive use measures meter.

Turbine type flow transducer uses the rotate speed of the impeller that is put in the fluid to undertake discharge checks, if pursue 3, 27 are shown. The lamina of impeller can be used guide magnetism material is made, by the magnet inside magnetism cable converter, core, coil and impeller blades 2 form magnetic circuit, when blade rotates, magnetoresistive will produce periodic change, make the induction in coil gives voltage pulse signal thereby. This signal is outputted after classics enlarge, plastics, regard the pulse that for detecting rotate speed uses as signal.

Flowmeter of fiber-optic sensor turbine, have turbine blade transforming namely, make its lamina end panel reflexes the light aptly, use reflection smooth fiber sensor and photoelectricity change-over circuit to detect of turbine lamina rotate, measure a flow thereby. If its principle pursues 3, 28 are shown.

Reflection smooth fiber sensor uses much model glass commonly fiber-optic, diameter of core of odd root fine 200 μ M, bore diameter is 0.3mm, by two fiber-optic composition, include to launch fine and light to receive fine solely, detect upright solidify is inside jacket of one aluminium alloy, can replace inside installation of magnetism type sensor is on turbine flowmeter. the letter a confusion of voices that raises reflection smooth fiber sensor is compared, assure to receive the resolution that reflexes signal, the modulation light that the illuminant in photoelectricity converter shoots electric design to be 10 ～ 12kHz is outputted, launch lamina of fine classics turbine to reflex through light, shoot signal from what receive fine to receive modulation light solely again, the changeover after classics filter wave is discharge pulse signal, signal answers time to be less than 0.2ms, detect limits is 1mm.

Traditional inside magnetism type sensor suffers its structure limitation to be able to detect only the rotate speed of blade, because bulk of reflection smooth fiber sensor is petty, two consequently reflection fiber-optic sensor stands side by side assemble go up in turbine flowmeter, two such sensor can detect same turbine

Blade is different reflection signal of the position, and noninterference of each other of two sensor signal, if pursue 3, 29 are shown. The F1 that sensor outputs and 2 signal classics are phasic after differentiating circuit, can output flowmeter to flow metric signal is mixed retrorse flow is metric signal.
Of S and tradition inside flowmeter of magnetism type turbine is compared, flowmeter of fiber-optic sensor turbine was had, the performance that countercurrent quantity measures. Detecting on the principle, gram of smooth fiber sensor was reached inside the influence that polarity of magnetism type sensor brings, enlarged turbine effectively to flow

Graph 3, 29 two-way reflex fiber-optic the span that passes feeling plan is compared. Because fiber-optic sensor is nonexistent inside the error that magnetism type sensor measures a principle to graph and turbine lamina produce magnetoresistive and be caused in discharge of low velocity of flow, also overcame inside magnetism type sensor produces saturated problem in signal of high flow area, its modulation smooth parameter still can follow overall design ask and change, for plan created advantage.

Additional, fiber-optic sensor is had what contact with flowmeter directly without electric signal is explosion proof, special the discharge that applies to the transparent medium such as gas, light qualitative oil plants is measured.

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