Auto-positioning ultrasonic transducer system

• US 7,762,118 B2
• Filed: 05/04/2007
• Issued: 07/27/2010
• Est. Priority Date: 05/05/2006
• Status: Expired due to Fees

• Current Assignee: University of Southern Mississippi
• Original Assignee: University of Southern Mississippi
• Inventors: Buchanan, Randy K.
• Primary Examiner(s): Raevis; Robert R
• Application Number:
  US11/800,424
• Publication Number:
  US 20080022776A1
• Time in Patent Office: 1,180 Days
• Field of Search: None
• US Class Current: 73/1.16
• CPC Class Codes: G01F 1/662 Constructional details
• CPC Class Codes: G01F 25/10 of flowmeters
• CPC Class Codes: G01N 2291/02836 Flow rate, liquid level

Abstract

An ultrasonic transducer apparatus and process for determining the optimal transducer position for flow measurement along a conduit outer surface. The apparatus includes a transmitting transducer for transmitting an ultrasonic signal, said transducer affixed to a conduit outer surface; a guide rail attached to a receiving transducer for guiding movement of a receiving transducer along the conduit outer surface, wherein the receiving transducer receives an ultrasonic signal from the transmitting transducer and sends a signal to a data acquisition system; and a motor for moving the receiving transducer along the guide rail, wherein the motor is controlled by a controller. The method includes affixing a transmitting transducer to an outer surface of a conduit; moving a receiving transducer on the conduit outer surface, wherein the receiving transducer is moved along a guide rail by a motor; transmitting an ultrasonic signal from the transmitting transducer that is received by the receiving transducer; communicating the signal received by the receiving transducer to a data acquisition and control system; and repeating the moving, transmitting, and communicating along a length of the conduit.

Claims

1. An ultrasonic transducer apparatus for determining the optimal transducer position for flow measurement along a conduit outer surface, comprising:

a transmitting transducer for transmitting an ultrasonic signal, said transducer affixed to a conduit outer surface;

a guide rail attached to a receiving transducer for guiding movement of a receiving transducer along the conduit outer surface, wherein the receiving transducer receives an ultrasonic signal from the transmitting transducer and sends a signal to a data acquisition system; and

a motor for moving the receiving transducer along the guide rail, wherein the motor is controlled by a controller.

2. The apparatus of claim 1, further comprising an encoder for determining a location of the receiving transducer.

3. The apparatus of claim 2, wherein the encoder is located remotely from the motor.

4. The apparatus of claim 2, wherein the encoder comprises a software program to track the location of the receiving transducer.

5. The apparatus of claim 1, further comprising an ultrasonic flowmeter that comprises the transmitting transducer and the receiving transducer to provide excitation signal for the transmitting transducer and for processing of an output signal from the receiving transducer.

6. The apparatus of claim 1, further comprising a programmable data acquisition and control system with digital and analog inputs/outputs for collecting output signal strength from transmitting and receiving transducers, creating a signal strength data file, searching of said data file for a user-defined parameter, and directing said motor to move the receiving transducer to a desired location along the conduit.

7. The apparatus of claim 6, wherein the data acquisition and control system comprises a user interface program for parameter input.

8. The apparatus of claim 1, wherein the transmitting transducer comprises a piezo electric material.

9. The apparatus of claim 1, wherein the receiving transducer comprises a piezo electric material.

10. The apparatus of claim 1, wherein the receiving transducer moves linearly along the conduit outer surface.

11. The apparatus of claim 1, wherein the receiving transducer moves linearly along the conduit outer surface parallel to that of the transmitting transducer.

12. The apparatus of claim 1, further comprising a shock absorber system to allow the receiving transducer to make continuous contact with the conduit outer surface.

13. A method for determining the optimum flow measurement receiving transducer position along a conduit outer surface, comprising:

a) affixing a transmitting transducer to a conduit outer surface;

b) moving a receiving transducer on the conduit outer surface, wherein the receiving transducer is moved along a guide rail by a motor;

c) transmitting an ultrasonic signal from the transmitting transducer that is received by the receiving transducer;

d) communicating the signal received by the receiving transducer to a data acquisition and control system; and

e) repeating steps b) through d) along a length of the conduit outer surface.

14. The method of claim 13, further comprising creating a data file of the signals received by the receiving transducer.

15. The method of claim 14, further comprising searching the data file for an optimum value of a parameter.

16. The method of claim 15, further comprising calculating an optimum receiving transducer location based the optimum value of a parameter.

17. The method of claim 16, further comprising positioning the receiving transducer to the optimum receiving transducer location.

18. The method of claim 17, further comprising using the data acquisition and control system to calculate the optimum receiving transducer location and to control the positioning the receiving transducer.

19. The method of claim 18, wherein the parameter to be optimized is a wave amplitude.

20. The method of claim 13, wherein the ultrasonic signal is communicated to the data acquisition and control system from at least 10 locations along the length of the conduit outer surface.