Sensor interrogation
First Claim
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1. A method for interrogating a sensor comprising the steps:
- applying a periodic coded electrical signal to the sensor, said periodic coded signal being characterized in that the periodic signal is a pseudo random binary signal, a Golay code, a Walsh function or a related periodic code;
obtaining a signal therefrom; and
performing an operation on the obtained signal to obtain the sensor response at a plurality of frequencies, said operation including a transformation to the frequency domain of said signal or a quantity related to said signal.
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Abstract
There is disclosed a method for interrogating a sensor comprising the steps: applying a periodic electrical signal to the sensor; obtaining a signal therefrom; and performing an operation on the obtained signal to obtain the sensor response at a plurality of frequencies, said operation including a transformation to the frequency domain of said signal or a quantity related to said signal.
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Citations
32 Claims
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1. A method for interrogating a sensor comprising the steps:
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applying a periodic coded electrical signal to the sensor, said periodic coded signal being characterized in that the periodic signal is a pseudo random binary signal, a Golay code, a Walsh function or a related periodic code;
obtaining a signal therefrom; and
performing an operation on the obtained signal to obtain the sensor response at a plurality of frequencies, said operation including a transformation to the frequency domain of said signal or a quantity related to said signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A sensor interrogation apparatus comprising:
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a sensor;
periodic electrical signal generator means for applying a periodic coded electrical signal to said sensor;
signal collection means for obtaining an electrical signal from said sensor;
time to frequency domain transformation means arranged to transform the obtained electrical signal to the frequency domain;
characterized in that the periodic signal is a pseudo random binary signal, a Golay code, a Walsh function or a related periodic code. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for interrogating a gas sensor comprising the steps:
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applying a periodic coded electrical signal to the gas sensor, said periodic coded signal being characterized in that the periodic signal is a pseudo random binary signal, a Golay code, a Walsh function or a related periodic code;
obtaining a signal therefrom; and
performing an operation on the obtained signal to obtain the gas sensor response at a plurality of frequencies, said operation including a transformation to the frequency domain of said signal or a quantity related to said signal. - View Dependent Claims (23, 24, 25, 26)
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27. A gas sensor interrogation apparatus comprising:
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a gas sensor;
periodic electrical signal generator means for applying coded electrical signal to said sensor, said periodic signal being characterized in that the periodic signal is a pseudo random binary signal, a Golay code, a Walsh function or a related periodic code;
signal collection means for obtaining an electrical signal from said sensor; and
time to frequency domain transformation means arranged to transform the obtained electrical signal to the frequency domain. - View Dependent Claims (28, 29, 30, 31, 32)
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Specification