Digitally based system for monitoring physical phenomena

• US 4,831,558 A
• Filed: 08/26/1986
• Issued: 05/16/1989
• Est. Priority Date: 08/26/1986
• Status: Expired due to Fees

• Current Assignee: The Slope Indicator Company
• Original Assignee: The Slope Indicator Company
• Inventors: Ernest, James E., Shoup, Dale W.
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): Cosimano, Edward R.
• Application Number:
  US06/900,543
• Time in Patent Office: 994 Days
• Field of Search: 340/825.06, 340/825.07, 340/825.08, 364/550
• US Class Current: 702/188
• CPC Class Codes: G01M 5/0041 by determining deflection or stress
• CPC Class Codes: G01M 5/0066 by exciting or detecting vibration or acceleration vibration testing of structures G01M7/00
• CPC Class Codes: G06F 11/10 Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's

Abstract

A system and apparatus for monitoring physical phenomena and changes in structures which includes a plurality of programmable intelligent transducers arranged in an array, each of which is uniquely addressable by a remote controller to perform its intended measurement functions, translate the analog measurement obtained into digital signals and transmit same to the controller. The monitoring is selective to each individual intelligent transducer. The intelligent transducers combine measurement functions, microprocessor functions and communication functions all programmed and activated from this central controller.

Claims

1. A digitally based monitoring system having, in locations remote from a controller means, a plurality of intelligent transducer modules for measuring and transmitting digital information on physical phenomena, the system comprising:

a controller means (1) to produce digital polling signals, said polling signals each having a unique address portion and an instruction portion to cause said intelligent transducer modules to perform programmed functions when said unique address portion of said polling signal is identical to said intelligent transducer module'"'"'s own unique address, and (2) to receive, record, and display digital responses from said intelligent transducer modules in an organized manner;

a plurality of intelligent transducer modules, each said module including transducer means, microprocessor means, and buffer circuitry means proximate to one another, wherein said transducer means generates signals corresponding to physical measurements of a particular physical phenomena, said microprocessor means includes memory means programmed to (1) receive a uniquely addressed digital polling signal and instruction from a remote controller means, (2) activate said transducer means to generate said signal, (3) translate said signal into a digital response, and (4) transmit said digital response to said controller means, and said buffer circuitry means directs incoming and outgoing data between said microprocessor means and said controller means;

power source means to power said intelligent transducer modules; and

means to conduct said polling signals and said digital responses between each of said intelligent transducer modules and said controller means, said means to conduct having a portion common to all of said intelligent transducer modules in said monitoring system.

2. The monitoring system of claim 1 wherein said microprocessor means and said memory means are further programmed to store said digital response temporarily and to transmit said digital response to said controller means only upon receiving a further uniquely addressed digital polling signal and instruction from said controller means.

3. The monitoring system as described in claim 1 wherein said intelligent transducer modules generate and transmit a redundant error code corresponding to said digital response, and said controller means receives said redundant error code, computes a redundant error code from said digital response received, compares the received redundant error code to the computed redundant error code, and rejects said digital response whenever the received redundant error code is not equivalent to the computed redundant error code.

4. The monitoring system as described in claim 3 wherein said controller means generates and transmits a redundant error code corresponding to said digital polling signal, and said intelligent transducer modules receive said redundant error code, compute a redundant error code from said digital polling signal received, compare the received redundant error code to the computed redundant error code and reject said digital polling signal whenever the received redundant error code is not equivalent to the computed redundant error code.

5. The monitoring system as described in claim 4 wherein said digital polling signals, said digital responses, and said redundant error code signals are transmitted and received serially from input/output serial transmission ports.

6. The monitoring system as described in claim 5 wherein said means to conduct comprises (1) an insulated conductor for transmission of said polling signals, digital responses and redundant error code signals, and (2) an insulated conductor to connect said power source means with said intelligent transducer modules, and (3) a ground reference conductor for said polling signals, digital responses, redundant error code signals and for ground return to said power source means.

7. The monitoring system as described in claim 5 wherein said means to conduct comprises (1) an insulated conductor for transmission of said polling signals, digital responses, redundant error code signals and power source means and (2) a ground reference conductor for said polling signals, digital responses, redundant error codes signals and for ground return for said power source means.

8. The monitoring system as described in claim 5 wherein said means to conduct comprises (1) two insulated conductors for transmission of said polling signals, digital responses, and redundant error code signals to said intelligent transducer modules and to said controller means, (2) an insulated conductor connecting said power source means with said intelligent transducer modules, and (3) a ground reference conductor for said polling signals, digital responses, response redundant error code signals and power return to said power source means.

9. The monitoring system as described in claim 5 wherein said means to conduct comprises a balanced pair of insulated conductors for transmitting said polling signals, digital responses, and redundant error code signals in a mirrored fashion, and a pair of insulated conductors to connect power supply means with said intelligent transducer modules.

10. The monitoring system as described in claim 5 wherein said means to conduct comprises a pair of insulated conductors for transmitting said polling signals, digital responses, and redundant error code signals superimposed on a relatively constant voltage, said voltage supplying power to said intelligent transducer modules.

11. A structural monitoring system having a plurality of intelligent transducer modules attached to a structure in locations remote from a controller means, said modules adapted for measuring and transmitting digital information on physical phenomena occurring at said remote attachment sites of said intelligent transducer modules, the system comprising:

a controller means (1) to produce digital polling signals, said polling signals each having a unique address portion and an instruction portion to cause said intelligent transducer modules to perform programmed functions when said unique address portion of said polling signal is identical to said intelligent transducer module'"'"'s own unique address, and (2) to receive, record, and display digital responses from said intelligent transducer modules in an organized manner;

a plurality of intelligent transducer modules, each said module including transducer means, microprocessor means, and buffer circuitry means proximate to one another, wherein said transducer means generates signals corresponding to physical measurements of a particular physical phenomenon, said microprocessor means includes memory means programmed to (1) receive a uniquely addressed digital polling signal and instruction from a remote controller means, (2) activate said transducer means to generate said signal, (3) translate said signal into a digital response in compact binary form, and (4) transmit said digital response to said controller means, and said buffer circuitry means directs incoming and outgoing data between said microprocessor means and said controller means;

power source means to power said intelligent transducer modules; and

data bus means to conduct said polling signals and said digital responses between each of said intelligent transducer modules and said controller means.

12. The structural monitoring system of claim 11 wherein said transducer means is a vibratory wire strain gauge.

13. The structural monitoring system of claim 11 wherein said microprocessor means and said memory means are further programmed to store said digital response temporarily and to transmit said digital response to said controller means only upon receiving a further uniquely addressed digital polling signal and instruction from said controller means.

14. A structural monitoring system as described in claim 11 further comprising:

a plurality of input/output serial interfaces, each interface having a data port enabling said intelligent transducer modules and controller means to transmit and receive said polling signals and digital responses serially.

15. A structural monitoring system as described in claim 14 wherein said data bus means comprises a pair of conductors, a first conductor connected with a first set of data ports of said plurality of input/output serial interfaces, and a second conductor connected with a second set of data ports of said plurality of in/out serial interfaces, said second conductor carrying an inverted signal referenced to said first conductor.

16. A structural monitoring system as described in claim 11, wherein said memory means within said intelligent transducer modules further contains program instructions to generate a redundant error code corresponding to numerical values of said digital response to be transmitted, where said redundant error code is transmitted as part of said digital response, and wherein said controller means further comprises a means (1) to compare said redundant error code transmitted as part of said digital response to a redundant error code computed using said numerical values of said digital response and (2) to reject any digital response which does not have a received redundant error code corresponding to said computed redundant error code.

17. The structural monitoring system as described in claim 16 wherein said controller means further contains instructions to generate a redundant error code corresponding to numerical values of said polling signals to be transmitted, where said redundant error code is transmitted as part of said polling signal, and wherein said intelligent transducer modules further contain in said memory means instructions to compare said transmitted redundant error code to a redundant error code computed using numerical values of said polling signal and to reject any polling signal which does not have a received redundant error code corresponding to said computed redundant error code.

18. A structural monitoring system as described in claim 17 wherein said data bus means to conduct comprises a balanced pair of conductors for transmitting said polling signals, digital responses, and redundant error code signals in a mirrored fashion, and a pair of insulated conductors to connect power supply means with said intelligent transducer modules.

19. The structural monitoring system as described in claim 17 wherein said data bus means to conduct comprises a pair of conductors for transmitting said polling signals, digital responses, and redundant error code signals superimposed on a relatively constant voltage, said voltage supplying power to said intelligent transducer modules.

20. A method of monitoring physical phenomena at remote locations over a common communication path comprising the steps of:

programming a plurality of remote intelligent transducer modules with instructions to gather and transmit, when polled, information from a sensor means to a controller means in a digital response in compact binary form, each of said modules including transducer mean, microprocessor means, and buffer circuitry means proximate to each other, and each of said modules having a unique address;

generating and transmitting a digital polling signal from said controller means to said plurality of remote intelligent transducer modules, said digital polling signal having a unique address portion and an instruction portion;

the one intelligent transducer module having a unique address equivalent to said unique address portion of said digital polling signal then responding by translating to a digital response a signal from said sensor means, which said signal corresponds to a measurement of one of said physical phenomena, and transmitting said digital response in compact binary form to said controller means;

repeating said step of generating and transmitting a polling signal addressed to each of said remote intelligent transducer modules whereby information gathered by each of said intelligent transducer modules is transmitted to said controller means for the purpose of monitoring, displaying and storing said information.

21. The method of claim 20 wherein each intelligent transducer module prepares and transmits a pair of simultaneous digital responses on two conductors, said digital responses mirroring each other to cancel out extraneous noise.

22. The method of claim 20 wherein said step of responding by translating to a digital response a signal from said sensor means further includes the steps of storing said digital response in a memory means included in said intelligent transducer module and transmitting said digital response to said controller means upon receipt of another polling signal having the unique address of said intelligent transducer module.

23. The method of claim 20 wherein said intelligent transducer modules generate and transmit redundant error codes corresponding to said digital responses, and wherein said controller means computes a redundant error code from each of said digital response, compares said transmitted redundant error code to said computed redundant error code and rejects any digital response whenever said transmitted redundant error code is not equivalent to said computed redundant error code.

24. The method of claim 23 wherein said controller means generates and transmits a redundant error code corresponding to said polling signal, and wherein each said intelligent transducer module computes a redundant error code from said polling signal, compares said transmitted redundant error code to said computed redundant error code, and rejects polling signal whenever said transmitted redundant error code is not equivalent to said computed error code.

25. An intelligent transducer module, said module including transducer means, microprocessor means, and buffer circuitry means proximate to one another, said module comprising:

transducer means suitable for measuring a physical phenomenon and generating a signal corresponding to a measurement of said phenomenon;

proximate to said transducer means, a microprocessor means including memory means and programmed to (1) receive a uniquely addressed digital polling signal and instruction from a remote controller means, (2) activate said transducer means to generate said signal, (3) translate said signal into a digital response and store said digital response temporarily, and (4) transmit said digital response to said controller means upon instruction; and

integral to said microprocessor means, a buffer circuitry means to direct incoming and outgoing data between said microprocessor means and said controller means.