GB2110421A - Apparatus for dynamic analysis of analog signals - Google Patents
Apparatus for dynamic analysis of analog signals Download PDFInfo
- Publication number
- GB2110421A GB2110421A GB8122153A GB8122153A GB2110421A GB 2110421 A GB2110421 A GB 2110421A GB 8122153 A GB8122153 A GB 8122153A GB 8122153 A GB8122153 A GB 8122153A GB 2110421 A GB2110421 A GB 2110421A
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- Prior art keywords
- data
- data acquisition
- analog
- control module
- analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D1/00—Measuring arrangements giving results other than momentary value of variable, of general application
Abstract
Apparatus for dynamic analysis of a plurality of analog electrical signals and particularly for fatigue analysis of a structure subject to mechanical stress, comprises a control module, and a data acquisition unit containing a plurality of data acquisition modules to which input analog signals from sensors are fed. Each data acquisition unit includes a specially arranged analog to digital converter, random access memory, microprocessor, programmable read- only memory, and input/output port communicating with the control module. The control module includes a microprocessor for control purposes, a programmable read-only memory, and input/output port communicating with the data acquisition modules for acquiring data therefrom and for sending control information thereto. A further input/output port on the control module allows communication with an external computer for further processing of acquired data. A battery ensures retention of data stored in memory in absence of main power supply.
Description
SPECIFICATION
Apparatus for dynamic analysis of analog signals
This invention relates to apparatus for the dynamic analysis of a plurality of analog electrical signals. It particularly, but not exclusively, relates to apparatus for the dynamic analysis of analog electrical signals from a plurality of sensors of mechanical strain attached to a component or structure under test to enable an assessment of the fatigue life of the component or structure to be obtained. Such a component or structure may, for example, comprise or form part of, a motor vehicle, aircraft, machine, or bridge.
The apparatus of the invention is designed to be compact and portable and of modular form, and capable of realisation using semiconductor integrated circuit technology.
The present invention provides apparatus for dynamic analysis of a plurality of analog electrical signals comprising:
A control module;
A data acquisition unit containing a plurality of data acquisition modules, each module comprising:
Input means for an analog signal from a sensor;
Analog to digital conversion means for said signal with means of matching prescribed limits of the conversion range thereof with a user defined range;
A random access memory for storage of digital data derived from said sensor during a test period and for storage of any other required data relating to the sensor and one or more events during said period;
A microprocessor adapted to control said analog to digital conversion means and transfer of data to said memory and from said memory to said control module;
A programmable read-only memory containing a predetermined program for said analysis;;
An input/output port for connection to said control module for receipt of control information from said control module and for output to said control module of data stored in said memory; said control module comprising:
A microprocessor for controlling transfer of control data from external equipment to respective data acquisition modules and for controlling transfer to said external equipment of stored data in said memory of each said data acquisition module;
A programmable read-only memory containing a predetermined program for said analysis;
An input/output port for output of control information to, and for receipt of stored data from, said plurality of data acquisition modules;
A further input/output port adapted to be connected to permit output of said stored data to external equipment which is operable to further process the stored data;;
said apparatus further including a stabilised
D.C. power supply for said control module and said data acquisition modules;
each of said analog signals being provided with adjustable amplification means therefor.
A further input/output port may be provided in each said data acquisition module arranged to enable data to be entered into the data acquisition module relating to one or more parameters of said sensor and/or a related component or structure and capable of allowing output of signals to means providing indication of one or more operating conditions in said data acquisition module. The said means providing indication of one or more operating conditions in a said data acquisition module from output signals from said further input/output port suitably comprise indicator lamps; the said operating conditions indicated may include operation of the microprocessor and also that signals for analog to digital conversion are inside or outside of the range of levels of conversion set for the analog to digital conversion means.
Means are preferably provided in said data acquisition modules to enable connection of battery means to ensure retention of data stored in the random access memories in event of failure or disconnection of the power supply, or if memories with stored data are required to be removed from the apparatus. The said control module may also include analog to digital conversion means enabling operation of said control module by an external analog stimulus.
The said microprocessor in said control module may also serve to control transfer of control data from said external analog stimulus to respective data acquisition modules. A random access memory may be provided in said control module and serving as a buffer for the data transferred from each said data acquisition module to said external equipment. The said external equipment associated with said control module may comprise a computer.
The said input means for an analog signal in said data acquisition module preferably includes a filter, having a pass band selected according to the dynamic range of the signals in the analysis.
The said adjustable amplification means for the
analog signals from said sensors may be provided within or external to said apparatus. When provided within the apparatus, they are conveniently incorporated in the said data acquisition modules. The said amplification means are suitably adjustable for gain and offset.
In a preferred embodiment, said plurality of analog signals are obtained from sensors of mechanical strain associated with a component or structure subjected to mechanical stress. The said dynamic analysis may be fatigue analysis of a said component or structure, and may suitably involve 'Rainflow' counting.
The said one or more parameters of said sensor and/or said related component or structure for which related data is enterable by way of said further input/output port of a said data acquisition module may comprise one or more of:
sensor reference numbers, sensor gauge factor(s), or component or structure material classification data.
The said user defined range matched with said prescribed limits of the conversion range of said analog to digital conversion means in a said data acquisition module comprises a mechanical strain range in said preferred embodiment.
The modular design of the apparatus readily allows adaptation to provide the required number of data acquisition modules according to the number of analog signal inputs to be accommodated. A specific embodiment of the invention is shown in schematic form in the accompanying drawing and is now described by way of example and although reference will be made in particular to fatigue analysis of a component or structure subjected to mechanical stress, the invention is not limited to this particular application.Requirements exist for carrying out dynamic fatigue analysis of a structure, such as a motor vehicle, aircraft, machine, bridge or structural components thereof, by providing a plurality of mechanical strain sensors on the structure or components and carrying out dynamic analysis of analog electrical signals received from the sensors, these signals representing a function of mechanical strain in the structure or components.
An embodiment of apparatus according to the invention for acquiring and analysing the plurality of signals from the sensors basically comprises a plurality of data acquisition modules housed in a unit and arranged such that a separate data acquisition module is connected to each sensor, and a single control module enabling communication between an operator and each data acquisition module. A stabilised DC. power supply (e.g. 5 volts) is provided for the modules and parallel bus lines extend between the modules.
Each data acquisition module is constructed as follows.
A two-lead signal input is provided to which is fed the analog signal from a strain sensor, by way of an amplifier with adjustable gain and offset and a suitable low or high pass filter having a cut-off frequency depending upon the dynamic test range. An Analog to digital converter, suitably of eight bits, for the analog signal is adapted and arranged whereby prescribed limits of the conversion range thereof are matched with a mechanical strain range, this being a particularly advantageous feature of the invention. A random access memory (RAM), e.g. of 2K to 16K bytes capacity, permits a storage of digital strain data derived from the sensor during a test period, storage of required data relating to the sensor, e.g. sensitivity, sensor identification etc., and storage of any required events during the test period.A battery is provided to enable data stored in the RAM to be retained in event of failure or switching off of the main power supply and may also be connected and arranged whereby the
RAM, with the battery connected thereto can be removed from the data acquisition module for transfer to appropriate apparatus where it may be desired to process the data stored therein. A microprocessor, e.g. a Zilog Z80, is used to control the analog to digital conversion and transfer of data to the RAM and from the RAM to the control module. A programmable read-only memory (PROM), e.g. of 2K byte capacity, is provided, containing a predetermined program selected according to a desired analysis schedule.
The PROM is arranged to be removable and replaceable by another with a different program therein should this be desired for different applications of the apparatus. A parallel input/output port is arranged on each data acquisition module for connection to the control module and operates for receipt of control information from the control module and for output to the control module of the data stored in the RAM. Each data acquisition module is suitably provided with a panel carrying controls and indicator lights connected to a further input/output port on the unit. A thumbwheel indicator permits input to the RAM of a two-digit number for entering strain sensor identification information and a further thumbwheel indicator is used for setting the required strain range.An indicator light is provided for giving a warning if the amplified analog strain signal from the sensor, applied to the analog to digital converter, is outside of the range of levels of conversion set for the converter. A further light may be provided for power supply on/off indication.
It is to be noted that although in the accompanying drawing the amplifiers for the analog signals are shown external to the apparatus, they need not be so and could be incorporated in the data acquisition modules if desired.
The control module contains a microprocessor, e.g. a Zilog Z80 microprocessor, which serves for controling transfer of control data to the data acquisition modules from external equipment such as a small computer, an example of a suitable computer being Model HP85 manufactured by Hewlett-Packard. This microprocessor also controls transfer to the external equipment of the data stored in the RAM of each data acquisition module, the external equipment, i.e. computer, being operable to further process the stored data. A parallel input/output port is provided on the control module for communication with the data acquisition modules. An input/output port on the control module adapted for connection to an
I.E.E.E. bus No. 488, or similar, is arranged to allow communication with the external computer, the selected computer having a suitably interfaced port for the I.E.E.E. bus and preferably having a mass storage capability for archiving of data and final results of the fatigue analysis. In addition to the Hewlett-Packard HP85 computer referred to above, other computers are available which are suitable for this purpose, e.g.
Commodore Pet or Apple models.
A programmable read-only memory (PROM) in
the control module is arranged to contain a
predetermined program appropriate to the fatigue
analysis to be carried out. Suitably this PROM is
of 2K byte capacity.
An optional random access memory (RAM),
e.g. of 2K byte capacity, in the control module,
serves as a buffer for the data to be transferred from the data acquisition modules to the external
computer.
The operator can communicate with the data
acquisition modules by way of the control module
using the external computer. Alternatively, a two lead signal input may be provided on the control
module to which an analog voltage stimulus may be applied to allow voltage excitation control of the apparatus. An analog to digital converter, suitably of 8 bits, is used to convert the analog voltage stimulus for application to the control module. Typicaly operation of the apparatus to carry out fatigue analysis of a structure is as follows. A number of dynamic analog signals e.g. twelve signals, of magnitude within +2 volts and maximum frequency less than 30 Hz form the input signals for an equal number of data acquisition modules.The analog signals are obtained from strain sensors on the structure, onsite conditioning and amplification of the signals from the sensors being provided. Alternatively, strain data may be acquired and stored on site using an instrumentation analog tape recorder and processed by the apparatus of the invention in the laboratory.
The following description relates to the processing of the signal from one sensor by one data acquisition module but it is to be understood that processing of the signals from the other sensors by the other data acquisition modules is carried out in like manner.
The analog to digital converter in the data acquisition module converts the +2 volts signal from the sensor to a digital value of between 0 and 256 inclusive (i.e. eight bit conversion).
During the initial part of the processing cycle, the signal is sampled at speeds of 10,000 samples per second. The last three samples are stored in the RAM in the data acquisition module and are used to determine whether the penultimate reading constituted a turning point of the signal, i.e. a maximum or minimum value. Samples which are equal in magnitude to preceding samples are not retained in memory. Once a turning point magnitude is determined, the magnitude of the penultimate turning point is subtracted to determine the signal range.The sign and magnitude of the signal range are used to update a 64 element availability array and an intermediate or occurrence array in the RAM according to known 'Rainflow' analysis techniques, such techniques being described in
Paper No. 740278 entitled "A Cycle Counting
Algorithm for Fatigue Damage Analysis", presented to the Society of Automotive Engineers at the Automotive Engineering Congress, Detroit in 1974 by F. D. Richards and N. R. La Pointe of
Ford Motor Co. and R. M. Wetzel of Instron
Corporation. Upon completion of this update, the
main processing cycle restarts with the 10,000 samples per second analog to digital conversion to determine the next turning point. At the end of a test period the intermediate (i.e. occurrence) array can be further processed remote from the apparatus in order to assess the fatigue life of the structure under test.
As previously described, the operator can communicate with the data acquisition module by way of the control module and either a small computer or by applying "a series of analogue excitation voltage levels". After switching on the apparatus and with the structure to be tested at a steady state, the amplifier provided for the input signal from each sensor is adjusted to give zero voltage output. A datum reading is taken and stored.
For calibration purposes, a shunt with a known microstrain equivalent is applied to the appropriate arm of a Wheatstone bridge into which the sensor is connected, for each input channel. The three digit, thumbwheel indicator on the control panel of each data acquisition module is set to the required strain range with units of 10 microstrain and with the fourth digit implicitly zero. For example a strain setting of 4000 microstrain is employed to cover a range of -2000 to +2000 microstrain. The two digit thumbwheel indicator which is also provided on the panel of each data acquisition module is used to input the reference number of the strain sensor or gauge associated with each particular data acquisition module. A calibration reading is then taken.The datum reading is subtracted from this reading and the difference then multiplied by one half of the total range set on the three digit thumbwheel indicator and divided by the microstrain calibration level. With correct gain setting of the amplifier, the resulting value after conversion should equal 128 for the required analog to digital converter strain range. If this value of 128 is exceeded, a warning light on the panel of the data acquisition module is illuminated; if the value of 128 is not exceeded, the light is not illuminated. The processor enters a continuous loop in which a reading is taken, the limit value is compared with 128 and the condition of the warning light noted. The gain control on the amplifier can be adjusted continuously until the light either just goes out or just comes on. At this point, the correct strain range is achieved.With the continuous loop still operating and with the correct amplifier gain setting, the three digit thumbwheel indicator is adjusted to the value of the most positive strain level. This means that if a setting of 4000 was initially used to set a strain range of -2000 to +2000 microstrain, a new setting of 3000 can be used to obtain a strain range of -1000 to +3000 microstrain. This is achieved in approximately the same manner as for the initial range but this time the zero offset control of the amplifier is adjusted. The final setting on the three digit thumbwheel indicator is used in the analysis software as a limit which, once reached, causes the analysis to terminate. This limit can be lowered at this stage if required, or increased if it is to be over-ridden.
A 'start' command causes the analysis procedure to continue with calibration determined conversion factors stored in the RAM of each data acquisition module to convert digital values, resulting from the analog to digital conversion, to microstrain. The final setting on the three digit thumbwheel indicator is stored in memory as a limit which, if reached, causes the analysis process to be terminated. The strain sensor identification number entered on the two digit thumbwheel indicator is also stored in the RAM in the particular data acquisition module.
A 'stop' command is used to cause signal processing to cease.
A 'transfer' command is executed to cause the intermediate array to be transferred by addition to the absolute array, for transmission to the external computer. The intermediate array is then initialised again.
It is possible to carry out a further calibration at this stage using the datum and calibration reading procedures described above, but this time there is only one calibration reading taken. If the present calibration reading is within 1% of the initial set calibration, the intermediate array is transferred automatically and the extra calibration data stored. If this stage of testing is not successful because for example, the structure being tested fails or undergoes some uncharacteristic loading, a 'kill' command can be used to reinitialise the intermediate array.
A further stage of testing can then be carried out by execution of the 'start' instruction. If desired, however, the absolute array and other stored variables can be transferred to the external computer for further processing by execution of a 'dump' instruction. If required, the equipment can be switched off for transporting to a processing laboratory or office before the 'dump' instruction is executed or the RAM in the data acquisition module can be removed and inserted in another unit before the 'dump' instruction is executed.
This facility is useful and is made available by the provision of a battery power supply for the RAM and which can operate to maintain the stored data for up to one month. The 'dump' instruction is able to be executed to transfer the data at any current state of the test to the external computer, the 'start' instruction being used to continue the test.
If a different test should be required without addition to the existing absolute array, a 'reset' instruction can be executed which will cause the absolute array to be initialised plus the secondary calibration data. If the apparatus is completely switched off and then on again, a total reset is effected, necessitating complete recalibration before further testing can be carried out.
The data from each data acquisition module which is transferred to the external computer is processed, either on the test site or later in the laboratory, whereby the digital ranges of the intermediate (i.e. occurrence) array are converted to strain ranges and by subtraction, the total number of cycles at particular strain ranges are obtained. The processes involved at this stage are known in the art and are described in the publication by Richards and La Pointe referred to earlier in this specification. Summation of the ratios of total number of cycles at a particular strain range to total number of cycles to failure of the test component or structure at this particular strain range is used to provide an assessment of the remaining life of the component or structure.
Claims (Filed on 3 Dec 1982).
1. Apparatus for dynamic analysis of a plurality of analog electrical signals comprising:
A control module;
A data acquisition unit containing a plurality of data acquisition modules, each module comprising:
Input means for an analog signal from a sensor;
Analog to digital conversion means for said signal with means of matching prescribed limits of the conversion range thereof with a user defined range;
A random access memory for storage of digital data derived from said sensor during a test period and for storage of any other required data relating to the sensor and one or more events during said period;
A microprocessor adapted to control said analog to digital conversion means and transfer of data to said memory and from said memory to said control module;
A programmable read-only memory containing a pre-determined program for said analysis;;
An input/output port for connection to said control module for receipt of control information from said control module and for output to said control module of data stored in said memory;
said control module comprising.~ A microprocessor for controlling transfer of control data from external equipment to respective data acquisition modules and for controlling transfer to said external equipment of stored data in said memory of each said data acquisition module;
A programmable read-only memory containing a pre-determined program for said analysis;
An input/output port for output of control information to, and for receipt of stored data from, said plurality of data acquisition modules; ;
A further input/output port adapted to be connected to permit output of said stored data to external equipment which is operable to further process the stored data,
Said apparatus further including a stabilised
D.C. power supply for said control module and said data acquisition modules;
Each of said analog signals being provided with adjustable amplification means therefor.
2. Apparatus according to Claim 1 in which a further input/output port is provided in each said data acquistion module arranged to enable data
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (19)
1. Apparatus for dynamic analysis of a plurality of analog electrical signals comprising:
A control module;
A data acquisition unit containing a plurality of data acquisition modules, each module comprising:
Input means for an analog signal from a sensor;
Analog to digital conversion means for said signal with means of matching prescribed limits of the conversion range thereof with a user defined range;
A random access memory for storage of digital data derived from said sensor during a test period and for storage of any other required data relating to the sensor and one or more events during said period;
A microprocessor adapted to control said analog to digital conversion means and transfer of data to said memory and from said memory to said control module;
A programmable read-only memory containing a pre-determined program for said analysis;;
An input/output port for connection to said control module for receipt of control information from said control module and for output to said control module of data stored in said memory;
said control module comprising.~ A microprocessor for controlling transfer of control data from external equipment to respective data acquisition modules and for controlling transfer to said external equipment of stored data in said memory of each said data acquisition module;
A programmable read-only memory containing a pre-determined program for said analysis;
An input/output port for output of control information to, and for receipt of stored data from, said plurality of data acquisition modules;;
A further input/output port adapted to be connected to permit output of said stored data to external equipment which is operable to further process the stored data,
Said apparatus further including a stabilised
D.C. power supply for said control module and said data acquisition modules;
Each of said analog signals being provided with adjustable amplification means therefor.
2. Apparatus according to Claim 1 in which a further input/output port is provided in each said data acquistion module arranged to enable data
to be entered into the data acquisition module relating to one or more parameters of said sensor and/or related component or structure and capable of allowing output of signals to means providing indication of one or more operating conditions in said data acquisition module.
3. Apparatus according to Claim 1 or 2 in which said means providing indication of one or more operating conditions in a said data acquistion module from output signals from said further input/output port comprise indicator lamps.
4. Apparatus according to Claim 3 in which said operating conditions indicated include operation of the microprocessor and also that the signals for analog to digital conversion are inside or outside of the range of levels of conversion set for the analog to digital conversion means.
5. Apparatus according to any one of the preceding Claims in which means are provided in said data acquisition modules to enable connection of battery means to ensure retention of data stored in the random access memories in event of failure or disconnection of the power supply, or if memories with stored data are required to be removed from the apparatus.
6. Apparatus according to any one of the preceding Claims in which said control module also includes analog to digital conversion means enabling operation of said control module by an external analog stimulus.
7. Apparatus according to Claim 6 in which said microprocessor in said control module also serves to control transfer of control data from said external analog stimulus to respective data acquisition modules.
8. Apparatus according to any one of the preceding Claims in which a random access
memory is provided in said control module and serving as a buffer for the data transferred from
each said data acquisition module to said external
equipment.
9. Apparatus according to any one of the
preceding Claims in which said external equipment associated with said control module
comprises a computer.
10. Apparatus according to any one of the preceding Claims in which said input means for an analog signal in said data acquisition module includes a filter having a pass band selected according to the dynamic range of the signals in the analysis.
11. Apparatus according to any one of the preceding Claims in which said adjustable amplification means for the analog signals from said sensors are provided within or external to said apparatus.
12. Apparatus according to Claim 11, in which said amplification means are provided within said apparatus and incorporated in the said data acquisition modules.
13. Apparatus according to any one of the preceding Claims in which said amplifications means are adjustable for gain and offset.
14. Apparatus according to any one of the preceding Claims in which said plurality of analog signals are obtained from sensors of mechanical strain associated with a component or structure subjected to mechanical stress.
15. Apparatus according to Claim 14 in which said dynamic analysis is fatigue analysis of said component or structure.
16. Apparatus according to Claim 15 in which said analysis involves Rainflow counting.
17. Apparatus according to any one of Claims
14 to 16 in which said one or more parameters of said sensor and/or said related component or structure for which related data is enterable by way of said further input/output port of a said data acquisition module comprises one or more of; sensor reference numbers, sensor gauge factor(s), or component or structure material classification data.
18. Apparatus according to any one of Claims 14 to 17 in which said user defined range matched with said prescribed limits of the conversion range of said analog to digital conversion means in a said data acquisition module comprises a mechanical strain range.
19. Apparatus for the dynamic analysis of a plurality of analog electrical signals constructed and arranged substantially as herein described with reference to the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8122153A GB2110421B (en) | 1981-07-17 | 1981-07-17 | Apparatus for dynamic analysis of analog signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8122153A GB2110421B (en) | 1981-07-17 | 1981-07-17 | Apparatus for dynamic analysis of analog signals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2110421A true GB2110421A (en) | 1983-06-15 |
| GB2110421B GB2110421B (en) | 1985-02-27 |
Family
ID=10523328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8122153A Expired GB2110421B (en) | 1981-07-17 | 1981-07-17 | Apparatus for dynamic analysis of analog signals |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2110421B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2151364A (en) * | 1983-12-13 | 1985-07-17 | Bermount Dev Limited | Load recording |
| EP0277006A2 (en) * | 1987-01-30 | 1988-08-03 | Westinghouse Electric Corporation | Smart sensor system for diagnostic monitoring |
| EP0483945A1 (en) * | 1990-09-27 | 1992-05-06 | Tektronix Inc. | Analog acquisition system including a high speed timing generator |
| EP0501900A1 (en) * | 1991-03-01 | 1992-09-02 | Socam | Method of analysing and displaying stored values, taken from a fluid transporting network |
| EP0623900A1 (en) * | 1993-05-03 | 1994-11-09 | SONY DEUTSCHLAND GmbH | Recycable component with data storage for storing information for examining the component and product including such a component |
| FR2710026A1 (en) * | 1993-09-17 | 1995-03-24 | Aerospatiale | Device for monitoring the propulsion system of an aircraft |
| EP0992923A1 (en) * | 1998-10-08 | 2000-04-12 | Thomson-Csf | System for data acquisition, processing & control |
| WO2001061301A1 (en) * | 2000-02-15 | 2001-08-23 | Koivisto, Marja-Liisa | Method for determining the strain of construction |
| WO2001065228A1 (en) * | 2000-02-28 | 2001-09-07 | Metso Paper Automation Oy | Monitoring system and its use |
| GB2387912A (en) * | 2002-04-26 | 2003-10-29 | Messier Dowty Inc | Monitoring parameters in structural components |
-
1981
- 1981-07-17 GB GB8122153A patent/GB2110421B/en not_active Expired
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2151364A (en) * | 1983-12-13 | 1985-07-17 | Bermount Dev Limited | Load recording |
| EP0277006A2 (en) * | 1987-01-30 | 1988-08-03 | Westinghouse Electric Corporation | Smart sensor system for diagnostic monitoring |
| EP0277006A3 (en) * | 1987-01-30 | 1991-05-29 | Westinghouse Electric Corporation | Smart sensor system for diagnostic monitoring |
| EP0483945A1 (en) * | 1990-09-27 | 1992-05-06 | Tektronix Inc. | Analog acquisition system including a high speed timing generator |
| EP0501900A1 (en) * | 1991-03-01 | 1992-09-02 | Socam | Method of analysing and displaying stored values, taken from a fluid transporting network |
| FR2673466A1 (en) * | 1991-03-01 | 1992-09-04 | Socam Sa | METHOD FOR ANALYZING AND VISUALIZING MEASUREMENTS RECORDED ON A FLUID NETWORK |
| EP0623900A1 (en) * | 1993-05-03 | 1994-11-09 | SONY DEUTSCHLAND GmbH | Recycable component with data storage for storing information for examining the component and product including such a component |
| US5654902A (en) * | 1993-05-03 | 1997-08-05 | Sony Deutschland Gmbh | Recyclable component with data storage for storing information for examining the component and product including such a component |
| FR2710026A1 (en) * | 1993-09-17 | 1995-03-24 | Aerospatiale | Device for monitoring the propulsion system of an aircraft |
| US5608627A (en) * | 1993-09-17 | 1997-03-04 | Aerospatiale Societe Nationale Industrielle | Device for supervising the propulsion system of an aircraft |
| EP0992923A1 (en) * | 1998-10-08 | 2000-04-12 | Thomson-Csf | System for data acquisition, processing & control |
| FR2784481A1 (en) * | 1998-10-08 | 2000-04-14 | Thomson Csf | DATA ACQUISITION, PROCESSING AND CONTROL SYSTEM |
| WO2001061301A1 (en) * | 2000-02-15 | 2001-08-23 | Koivisto, Marja-Liisa | Method for determining the strain of construction |
| WO2001065228A1 (en) * | 2000-02-28 | 2001-09-07 | Metso Paper Automation Oy | Monitoring system and its use |
| GB2387912A (en) * | 2002-04-26 | 2003-10-29 | Messier Dowty Inc | Monitoring parameters in structural components |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2110421B (en) | 1985-02-27 |
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