Transducer with integral memory

• US 4,868,476 A
• Filed: 10/30/1987
• Issued: 09/19/1989
• Est. Priority Date: 10/30/1987
• Status: Expired due to Term

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Hewlett-Packard Company (HP Inc.)
• Inventors: Respaut, James E.
• Primary Examiner(s): Ro, Bentsu
• Application Number:
  US07/115,689
• Time in Patent Office: 690 Days
• Field of Search: 73/587, 73/597, 73/599, 73/607, 73/609, 73/611, 73/618, 73/619, 73/620, 73/625, 73/626, 73/628-629, 73/632-634, 128/633, 128/660, 318/490, 318/632, 318/652, 318/653, 318/656, 318/657, 342/185, 367/103, 367/105, 368/9
• US Class Current: 318/632
• CPC Class Codes: G10K 11/355 Arcuate movement

Abstract

A memory means is provided which is adapted to be mounted integral with the transducer element used in a transducer system. The memory may store nonlinearity error information or other information concerning errors in the positioning or scan control for the particular transducer, which information may be utilized by the transducer system to compensate for such errors. The memory may also be utilized to store selected information concerning the measured output characteristics of the transducer element which may be utilized by the transducer system to assure that a desired output level is achieved from the transducer element or that the output otherwise is in conformance with that desired. One or more bytes may be provided in the memory which may be utilized to inhibit use of the associated transducer element for particular fields of use or classes of service. The memory element may also store other selected information concerning the particular transducer element, including various operating constants for the element, which information may be utilized by the transducer system to control the operation of the transducer element, to evaluate responses obtained from the transducer, for service, or for other selected purposes. If an erasable memory is used, an area of the memory may also be utilized to store information concerning the operation of the transducer element, such as its duration of use, which information is periodically updated in the memory by the processor.

Claims

1. A servo-controlled scanning transducer system of the type having a transducer including a transducer element to be scanned, means for sensing the position of the element in its scan path and means responsive to the position sensed by said sensing means for controlling the movement of said element, a means for compensating for errors in transducer element scanning, comprising:

memory means for storing correcting information for said errors; and

means for mounting the memory means integral with the transducer element;

said means for controlling including means for generating a reference signal, means for comparing the position of the transducer element sensed by said position sensing means at a point in time with the reference signal for the corresponding point in time, drive means responsive to a difference output from the means for comparing for controlling the scanning of the transducer element, and means for utilizing the correcting information stored in said memory means to warp the reference signal in a manner to permit a substantially uniform scan speed for said transducer element.

2. A system as claimed in claim 1 wherein said transducer is a scanning ultrasonic transducer.

3. A system as claimed in claim 1 wherein said transducer included a head containing said transducer element, an electrical connector for connecting the transducer element into said system and a cable connecting said head and connector;

and

wherein said means for mounting includes means for mounting the memory means in the electrical connector.

4. A system as claimed in claim 1 wherein said transducer element generates an output signal as it is scanned;

wherein said memory means stores an indication of a selected output signal characteristic from said transducer element for selected conditions; and

including means for utilizing the output signal characteristic indications stored in said memory means to control the selected output signal characteristic from said transducer element.

5. A system as claimed in claim 4 wherein the selected output signal characteristic is output power.

6. A system as claimed in claim 4 including a field-of-use control indication stored in said memory means;

and

means responsive to the field of use control indication for limiting the fields of use for the transducer element.

7. A system as claimed in claim 1 wherein said memory means is at least selectively erasable;

and including means for storing in said memory means selected information concerning operation of the transducer element.

8. A system as claimed in claim 7 wherein said means for storing includes means for storing information concerning duration of service for said transducer element.

9. A system as claimed in claim 1 wherein said memory means also stores selected additional information concerning said transducer element.

10. A system as claimed in claim 9 wherein said additional information includes various operating constants for said transducer element.

11. A system as claimed in claim 1 wherein the errors in transducer element scanning are caused by the position sensing means for the transducer element which sensing means has nonlinearity errors;

including means for storing a table of selected positions in said scan path at which selected actions are to be taken with respect to the transducer element;

means for utilizing said table to control where in the scan path the selected actions are taken; and

means for utilizing the stored correcting information to modify positions stored in the table so that actions are taken at uniform intervals.

12. A system as claimed in claim 11 wherein the action to be taken is the energizing of said transducer to generate an output.

13. A transducer system having a transducer element adapted to generate a scanning output signal, a means for controlling the output power of said scanning output signal, comprising:

memory means for storing an indication of the output power characteristic from said transducer element for selected driving signals applied thereto;

means for mounting the memory means integral with the transducer element; and

means for utilizing the output power characteristic indication stored in said memory means to control the output power of the scanning output signal from said transducer element.

14. A system as claimed in claim 13 including a field of use control indication stored in said memory means;

and

means responsive to the field of use control indication for limiting the fields of use for the transducer element.

15. A system as claimed in claim 13 wherein said transducer element is an ultrasonic transducer;

and wherein said power characteristic indication is a power table indicating the ultrasonic power output from the transducer element for at least selected settings of the transducer system.

16. A transducer system having a servo-controlled scanning transducer element, a means for providing selected current information concerning the operation of the transducer element, comprising:

memory means for storing the selected information concerning the transducer element, said memory means being a read-write memory at least in the area thereof in which said selected information is stored;

means for mounting the memory means integral with the transducer element; and

means responsive to the operation of the transducer element for periodically updating the selected information stored therein to keep such information current.

17. A system as claimed in claim 16 wherein said selected information is information concerning duration of service for said transducer element.

18. In a servo-controlled scanning transducer system of the type having a transducer element to be scanned, the transducer system including at least one element adapted for use in controlling the scanning of the transducer element which one element has a measurable error characteristic, a method for compensating for errors in transducer element scanning comprising the steps of:

storing integral with the transducer element correcting information for said error characteristic;

generating a reference signal;

continuously sensing the position of the transducer element;

comparing the position sensed for the transducer element at a point in time with the reference signal for the corresponding point in time;

utilizing the difference in output from the comparing step to control the scanning of the transducer element;

reading the stored correcting information; and

utilizing the stored correcting information to warp the reference signal in a manner to permit a substantially uniform scan speed for the transducer element.

19. A method as claimed in claim 18 wherein the element having the error characteristic is a position sensor for the transducer element which sensor has nonlinearity errors;

and

including the steps of performing selected actions with respect to the transducer element at selected positions in the scanning of the element;

storing a table of selected positions in said element scanning, utilizing said table to control where in the scanning of the element said selected actions are taken;

and utilizing the stored correcting information to modify positions stored in the table.

20. In a transducer system having a scanning transducer element adapted to generate a scanning output signal, a method for controlling the output power of the scanning output signal comprising the steps of:

storing integral with the transducer element an indication of the output power characteristic for the transducer element for selected driving signals applied thereto; and

utilizing the stored output power characteristic indication to control the output signal power of the scanning output signal from the transducer element.

21. In a transducer system having a servo-controlled scanning transducer element, a method for providing current selected information concerning the operation of the transducer element comprising the steps of:

storing the selected information concerning the operation of the transducer element in a read-write memory means mounted integral with the transducer element; and

selectively updating the selected information stored in the memory means in response to the operation of the transducer element to keep such information current.

22. A method as claimed in claim 21 wherein the selected information stored in the memory means is information concerning the duration of service of the transducer element.