Thermal pulse flowmeter sensor

Details Thermal pulse flowmeter sensor Thermal pulse flowmeter sensor

G - Physics

01

F

G01F 1/688 (2006.01) E21B 49/08 (2006.01) G01K 7/04 (2006.01) G01N 9/00 (2006.01) G01F 1/74 (2006.01)

Patent

CA 2178175

A sensor for use in measuring flow rate or density of a fluid or gas in a well or similar environment comprises a solid plastic body having a relatively low thermal conductivity. A coiled thermocouple is formed around the body so that a temperature difference between opposite sides of the body will generate a voltage from the thermocouple. The coiled thermocouple consists of a series of turns of constantan wire wound around the body thereby forming a coil, and having plated onto each turn along one side of the coil a layer of copper, thereby forming an area of continuous thermocouple under the plated copper on each turn of the wire. A heater wire is positioned along one side of the thermocouple coil to generate heat energy into the body as well as into the fluid or gas to be measured. The resulting temperature differential across the body causes a thermocouple voltage to be generated which has a calibrated relationship to the flow rate or density of the fluid or gas to which the sensor is exposed.

Capteur servant à mesurer le débit ou la densité d'un fluide ou d'un gaz dans un puits ou un environnement analogue, constitué d'un corps rigide en plastique ayant un coefficient de conductivité thermique relativement bas. Un thermocouple enroulé autour du corps crée, grâce à la différence de température entre les côtés opposés du corps, une tension électrique. Le thermocouple est constitué d'une série d'enroulements de fil de constantan autour du corps, formant ainsi une bobine, et d'un placage de cuivre sur chaque enroulement, d'un côté, formant une surface de thermocouple continu sous le placage de cuivre, sur chaque enroulement de fil. Une résistance chauffante, le long d'un côté de la bobine de thermocouple, réchauffe le corps ainsi que le fluide ou le gaz à mesurer. La différence de température dans le corps cause la tension de thermocouple à générer, dont le rapport est gradué selon le débit ou la densité du fluide ou du gaz auquel le capteur est exposé.

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