Multiple sensor ultrasonic monitoring device

• US 6,220,098 B1
• Filed: 07/29/1999
• Issued: 04/24/2001
• Est. Priority Date: 05/06/1998
• Status: Active Grant

• Current Assignee: Computational Systems Incorporated (Emerson Electric Company)
• Original Assignee: CSI Technology Incorporated (Emerson Electric Company)
• Inventors: Van Voorhis, James B., Robinson, James C., Johnson, William S., Piety, Kenneth R.
• Primary Examiner(s): Williams, Hezron
• Assistant Examiner(s): MILLER, ROSE MARY
• Application Number:
  US09/363,709
• Time in Patent Office: 635 Days
• Field of Search: 735/92, 736/49, 735/84, 735/87, 735/96, 73/405.A, 735/90, 735/93, 736/32, 738/665, 736/60, 736/58, 736/61, 340/825.36, 374/117
• US Class Current: 73/592
• CPC Class Codes: G01H 1/00 Measuring characteristics of vibrations in solids by using direct conduction to the detector G01H9/00, G01H11/00 take precedence
• CPC Class Codes: G01H 3/00 Measuring characteristics of vibrations by using a detector in a fluid G01H7/00, G01H9/00, G01H11/00 take precedence
• CPC Class Codes: G01N 2291/02863 Electric or magnetic parameters
• CPC Class Codes: G01N 2291/02881 Temperature

Abstract

An ultrasonic monitoring apparatus is provided for use by an operator in detecting ultrasonic vibrations and sound waves. The ultrasonic monitoring apparatus consists of a hand held device with a sensor socket that allows a variety of different types of sensors to be interchangeably installed in the hand held device. These sensors include both contact and airborne ultrasonic sensors as well as a combination temperature and ultrasonic sensor that allows the operator to simultaneously monitor the surface temperature of an object and the ultrasonic vibrations produced by the object. Identification information corresponding to the type of sensor is encoded on the individual sensors. The identification information is read by an identification circuit located in the hand held device. This identification information allows the hand held device to configure itself to operate with the type of sensor installed in the socket.

Claims

1. An ultrasonic monitoring device for detecting ultrasonic sound waves and vibrations, the device comprising:

a housing for containing the ultrasonic monitoring device in a manner that allows the ultrasonic monitoring device to be portably used by an operator;

at least one removable airborne ultrasonic sensor for detecting airborne ultrasonic sound waves and producing ultrasonic electrical signals related to said ultrasonic sound waves;

at least one removable contacting ultrasonic sensor for sensing ultrasonic vibrations be being placed in contact with an object and producing ultrasonic electrical signals related to said ultrasonic vibrations;

a sensor socket for receiving at least one of said removable sensors;

a digital processing means;

a split path signal conditioning means comprising a first circuit path for receiving and conditioning ultrasonic electrical signals wherein a logarithmic amplifier means provides an amplitude demodulated envelope of the ultrasonic electrical signals for input to said digital processing means; and

a second circuit path for receiving and conditioning ultrasonic electrical signals and providing said ultrasonic electrical signals to a frequency conversion means for translation to audible frequency electrical signals; and

an output means for communicating the results of the digital analysis to a user of the device.

2. The device of claim 1 wherein said removable sensors further comprise an information storage means for storing an identification code, a zero offset factor, frequency response data, and calibration data unique to the particular sensor.

3. The device of claim 2 wherein said output means provide information corresponding to the identification code stored in the selected sensor.

4. The device of claim 1 wherein said sensor socket further comprises a bayonet style locking groove mechanism for retention of said removable sensors.

5. The device of claim 4 wherein the removable sensors further incorporate at least one projection or pin for mating with the bayonet locking grooves in the device housing.

6. The device of claim 5 wherein said sensor socket further comprises a set of electrical contact pins wherein the contact pins are spring loaded for connection to said removable sensors.

7. The device of claim 1 further comprising a serial communications port for cabled communication with a computer or data logger.

8. The device of claim 1 further comprising at least one removable temperature sensor for sensing the temperature of an object and producing electrical signals corresponding to the temperature of the object.

9. The device of claim 1 further comprising a means for providing a referenced decibel value of the ultrasonic sound or the ultrasonic vibrations to the output means.

10. The device of claim 1 wherein a DC voltage value of any instantaneous point of the demodulated envelope corresponds to a referenced decibel value.

11. The device of claim 1 wherein the frequency conversion means is a heterodyning circuit.

12. The device of claim 1 wherein said device is a passive device.

13. An ultrasonic monitoring device for monitoring ultrasonic sound waves, the device comprising:

a housing for containing the ultrasonic monitoring device in a manner that allows the ultrasonic monitoring device to be portably used by an operator;

a set of sensors, including at least one of a contact ultrasonic sensor for sensing ultrasonic vibrations by being placed in contact with an object producing ultrasonic vibrations, an airborne ultrasonic sensor for sensing ultrasonic sound waves being produced by an object without coming into contact with the object and an ultrasonic sensor for sensing ultrasonic vibrations having an integral temperature sensor for sensing temperature of an object, for producing electrical signals in response to a variety of different conditions wherein each sensor in the set of sensors has a plurality of electrical contacts;

a sensor socket located on the housing of the ultrasonic monitoring device that is designed to interchangeably and removably receive a sensor from the set of sensors wherein the sensor socket has a plurality of electrical contacts for electrically receiving electrical signals from the plurality of electrical contacts of a sensor installed in the sensor socket and providing the electrical signals from the sensor installed in the sensor socket to the ultrasonic monitoring device wherein the ultrasonic monitoring device is passive and each sensor in the set of sensors contains identification information encoded on the sensor and wherein the ultrasonic monitoring device contains an identification circuit for receiving and analyzing the identification information from a sensor installed in the sensor socket and configuring the ultrasonic monitoring device to operate with the sensor installed in the sensor socket; and

a wireless communications port for sending and receiving signals and for providing properties of the electrical signals from the sensor installed in the sensor socket to an external processing device for analysis.

14. The device of claim 13 further comprising at least one protrusion fixedly attached to the sides of each of the sensors in the set of sensors wherein the protrusions are shaped and positioned to be received in at least one groove in the sensor socket in a manner that removably secures the sensor in the sensor socket.

15. The device of claim 14 wherein the open receiving portion of the at least one groove is positioned so that the sensors will always be installed in the sensor socket with the same orientation.

16. The device of claim 15 further comprising installation guide means which prevent a sensor from the set of sensors from being improperly installed in the sensor socket.

17. The device of claim 13 further comprising focusing means having a large opening and a small opening such that said large opening fits around an installed sensor from the set of sensors and said small opening receives said ultasonic sound waves such that the area from which the sensors can receive the ultrasonic sound waves is focused.

18. The device of claim 13 further comprising a display for displaying properties of the electrical signals and displaying identification information concerning the sensor installed in the sensor socket.

19. The apparatus of claim 13 further comprising analysis means for performing time and frequency domain waveform analysis on the ultrasonic electrical signals.

20. The apparatus of claim 13 further comprising alarm means for indicating when an ultrasonic electrical signal exceeds a user selected threshold value.

21. An ultrasonic monitoring device for monitoring ultrasonic sound waves, the device comprising:

a housing for containing the ultrasonic monitoring device in a manner that allows the ultrasonic monitoring device to be portably used by an operator;

a set of sensors, including at least one of a contact ultrasonic sensor for sensing ultrasonic vibrations by being placed in contact with an object producing ultrasonic vibrations and producing electrical signals related to said ultrasonic vibrations, and an airborne ultrasonic sensor for sensing ultrasonic sound waves being produced by an object without coming into contact with the object and producing electrical signals related to said ultrasonic sound waves;

a sensor socket located on the housing of the ultrasonic monitoring device that is designed to interchangeably and removably receive a sensor from the set of sensors wherein the sensor socket has electrical contacts for electrically receiving electrical signals from electrical contacts on a sensor installed in the sensor socket and configuring said ultrasonic monitoring device to operate with said sensor installed in the sensor socket;

a digital microprocessor for receiving and processing said electrical signals from said sensor socket and producing digital output data; and

an RS 232 port for receiving said output data from said digital microprocessor and outputting said output data to an external device wherein said external device stores said output data and trends said output data over a period of time.

22. The device of claim 21 wherein said digital microprocessor is capable of producing a referenced decibel output based upon said electrical signals from said sensor in said sensor socket.

23. The device of claim 21 wherein said digital microprocessor is configured to receive software upgrades provided to said RS 232 port from an external source such that said ultrasonic device can be configured to process signals from newly designed sensors installed in said sensor socket.

24. A digital ultrasonic monitoring device for monitoring ultrasonic sound waves, the device comprising a sensor socket located on a housing of the ultrasonic monitoring device that is designed to interchangeably and removably receive a sensor from a set of sensors wherein the sensor socket has electrical contacts for electrically receiving electrical signals from electrical contacts on a sensor installed in the sensor socket and wherein said sensors in said set of sensors have different sensing properties and wherein each sensor contains an identification code such that said digital ultrasonic monitoring device can identify said sensors based upon said identification code.