Transducer-based sensor system
First Claim
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1. A transducer-based sensor system, comprising:
- a transducer configured to produce electrical output based on movement of the transducer;
a synchronous detector operatively coupled to the transducer and configured to produce, in response to application of electrical output from the transducer, plural signal components in an operative range of frequencies, where such plural signal components are subject to subsequent downstream processing to extract a desired, substantially noise-free output signal associated with the transducer; and
a matching device coupled with the synchronous detector and configured to present the synchronous detector with a substantially matched output impedance over the operative range of frequencies, to enhance linearity in processing of electrical output from the transducer.
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Abstract
A transducer-based sensor system including a drive signal generator for generating a drive signal, a transducer coupled to the drive signal generator and configured to receive the drive signal, a mixer coupled to the transducer and configured to receive output from the transducer where such output results at least in part from physical movement of the transducer, and a diplexer operatively coupled with an output of the mixer and configured to present a substantially matched output impedance to the mixer over an operative range of output frequencies.
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Citations
17 Claims
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1. A transducer-based sensor system, comprising:
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a transducer configured to produce electrical output based on movement of the transducer; a synchronous detector operatively coupled to the transducer and configured to produce, in response to application of electrical output from the transducer, plural signal components in an operative range of frequencies, where such plural signal components are subject to subsequent downstream processing to extract a desired, substantially noise-free output signal associated with the transducer; and a matching device coupled with the synchronous detector and configured to present the synchronous detector with a substantially matched output impedance over the operative range of frequencies, to enhance linearity in processing of electrical output from the transducer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A transducer-based sensor system, comprising:
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a plurality of transducers configured to be placed into operative proximity to a sample material; a drive signal generator configured to apply electrical drive signals to the transducers to cause the transducers to move; and an output processing subsystem configured to process electrical output produced by movement of the transducers, the output processing subsystem including; a mixer configured to mix electrical output of at least one of the transducers with an oscillatory signal that is synchronous with an expected component of the transducer'"'"'s electrical output, the oscillatory signal being thereby configured to facilitate synchronous detection of the expected component, and an impedance coupled within an output signal path associated with the at least one of the transducers, the impedance being configured to present a substantially matched output impedance to the mixer over an operative range of frequencies, the impedance being further configured to inhibit signal reflections so as to simplify downstream rejection of unwanted signal components, where the drive signal generator is programmable to adjustably provide an oscillatory drive signal having a frequency corresponding to a resonant frequency of one of the transducers. - View Dependent Claims (10, 11, 12)
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13. A transducer-based sensor method, comprising;
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producing an electrical output signal based at least in part on movements of a transducer; applying the electrical output signal to a synchronous detector; applying a local oscillator signal to the synchronous detector, thereby causing the synchronous detector to output plural output signal components in an operative range of frequencies; and outputting the plural output signal components to a computing device along an output signal path having an impedance, where the impedance is configured to present a substantially matched output impedance to the synchronous detector over the operative range of frequencies.
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14. A transducer-based sensor method, comprising:
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driving a transducer array to cause transducer movement and a corresponding electrical output signal; applying the electrical output signal to a synchronous detector; applying an oscillatory signal to the synchronous detector, thereby causing the synchronous detector to output plural output signal components in an operative range of frequencies; and providing the plural output signal components to a computing device along an output signal path having an impedance, where the impedance is configured to provide a substantially matched output impedance to the synchronous detector for the operative range of frequencies. - View Dependent Claims (15, 16, 17)
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Specification