DEVICE FOR REGULATING A WIRE ANEMOMETER

• US 20110308312A1
• Filed: 12/18/2009
• Published: 12/22/2011
• Est. Priority Date: 12/19/2008
• Status: Active Grant

• Current Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Original Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Inventors: Moro, Jean-Paul
• Granted Patent: US 9,069,002 B2
• Time in Patent Office: Days
• US Class Current: 73/204.27
• CPC Class Codes: G01P 5/10 by measuring thermal variables

Abstract

An anemometer probe having a single wire or n wires (n>1) that are mutually parallel, for a measurement close to a wall, comprising, for each wire: a) two pins for holding the wire in place, the end of each pin having a flat zone for positioning and fastening the wire; and b) a straight portion of wire brazed onto said flat zones for positioning and fastening the wire.

Claims

1. Device for regulating a wire anemometer, at constant current, comprising:

means for supplying and means for regulating a supply current of the wire and a reference resistor,

means for establishing a difference between a signal at the terminals of the wire of the probe and a signal at the terminals of the reference resistor,

means for maintaining a constant temperature of the device.

2. Device according to claim 1, the wire and the reference resistor being current mirror mounted.

3. Device according to claim 1, the means for regulating a supply current comprising a diode mounted regulating transistor and a potentiometer.

4. Thermo-anemometer having a cold wire, comprising:

a wire anemometer,

a regulation device according to claim 1.

5. Thermo-anemometer having a cold wire, according to claim 4, the wire anemometer, comprising:

a) two pins for holding the wire in place, the end of each pin comprising a flat zone for positioning and fastening the wire,

b) a straight portion of wire, brazed onto said flat zones for positioning and fastening the wire.

6. Thermo-anemometer according to claim 5, wherein the ends of the pins are separated by a distance at least equal to 4 mm.

7. Thermo-anemometer according to claim 5, at least one of the wires comprising a central core, of diameter d between 0.35 and 0.6 μ

m, and a sheath, eliminated on a portion of wire, known as sensitive zone, of length between 0.4 mm and 0.5 mm.

8. Thermo-anemometer according to claim 5, wherein the wire is brazed onto the pins by means of a brazing based on lead or a tin-lead alloy.

9. Thermo-anemometer according to claim 5, wherein the wire has a curving contour.

10. Thermo-anemometer according to claim 5, wherein the pins are fastened to a probe body provided with a vibration dampening envelope.

11. Method for measuring temperature in a flowing fluid, comprising the use of a thermo-anemometer according to claim 5, maintained at constant temperature.

12. Method according to claim 11, wherein the measurement is carried out without additional means of thermistor or thermocouple type.

13. Method according to claim 11, wherein a variation in temperature and an average temperature are measured by means of the thermo-anemometer.

14. Thermo-anemometer according to claim 5, at least one of the wires comprising a central core, of diameter d, and a sheath, eliminated on a portion of wire, known as sensitive zone, of length l, with l/d between 600 and 1500.

15. Thermo-anemometer according to claim 5, comprising n wires (n>

1) that are mutually parallel, separated by a distance.

18. Thermo-anemometer having a cold wire according to claim 1, comprising:

a wire anemometer, and

a regulation device for regulating a wire anemometer, at constant current, having;

a battery for supplying and a potentiometer and a diode mounted regulating transistor for regulating a supply current of the wire and a reference resistor,

an amplifier for establishing a difference between a signal at the terminals of the wire of the probe and a signal at the terminals of the reference resistor,

a heating carpet for maintaining a constant temperature of the device.

19. Thermo-anemometer having a cold wire, according to claim 18, the wire anemometer, comprising:

a) two pins for holding the wire in place, the end of each pin comprising a flat zone for positioning and fastening the wire,

b) a straight portion of wire, brazed onto said flat zones for positioning and fastening the wire.

16. Device for regulating a wire anemometer, at constant current, comprising:

a battery for supplying and a potentiometer and a diode mounted regulating transistor for regulating a supply current of the wire and a reference resistor,

an amplifier for establishing a difference between a signal at the terminals of the wire of the probe and a signal at the terminals of the reference resistor,

a heating carpet for maintaining a constant temperature of the device.

17. Device according to claim 16, the wire and the reference resistor being current mirror mounted.