Method and system for measuring a characteristic loop sensitivity for an acoustic transducer
AssigneeBroadsound Corporation
InventorsYing-Wei YUAN, Fu-Chieh YANG, Jen-Chih YAO, Yi-Lung YU
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Abstract
A method and system is disclosed for measuring a characteristic loop sensitivity (SLC) for an acoustic transducer. A pulse signal is employed as a wideband reference signal Vr(t); and, in a pulse-echo measurement a corresponding wideband echo signal Ve(t) is obtained. A characteristic loop sensitivity (SLC) for the acoustic transducer is defined as a ratio of an energy density of Ve(t) to an energy density of Vr(t) in decibel, in which the energy density of a given signal is calculated as a ratio of an energy of the signal to a bandwidth of the signal.
Claims17
A method for measuring a characteristic loop sensitivity for an acoustic transducer, the measuring steps comprising:
- generating a pulse to create a wideband signal as a reference signal;
- obtaining a wideband reference signal Vr(t);
- obtaining a function {circumflex over (V)}r(f) that is a Fourier Transform of the wideband reference signal Vr(t);
- obtaining an energy spectrum of wideband reference signal based on the function {circumflex over (V)}r(f);
- calculating a bandwidth of reference signal (BWr) at a designated decibel for the energy spectrum of the wideband reference signal;
- calculating an energy of reference signal (Er) for the wideband reference signal Vr(t);
- and
- calculating an energy density of reference signal (Dr) for the wideband reference signal:
- Dr=Er/BWr.
A method for measuring a characteristic loop sensitivity for an acoustic transducer, the measuring steps comprising:
- generating a wideband acoustic wave from the acoustic transducer;
- obtaining a wideband echo signal Ve(t) after the wideband acoustic wave being reflected from an acoustic mirror;
- obtaining a function {circumflex over (V)}e(f) that is a Fourier Transform of the wideband echo signal Ve(t);
- obtaining an energy spectrum of wideband echo signal based on the function {circumflex over (V)}re(t);
- calculating a bandwidth of echo signal (BWe) at a designated decibel for the energy spectrum of wideband echo signal;
- calculating an energy of echo signal (Ee) for the wideband echo signal Ve(t);
- and
- calculating an energy density of echo signal (De) for the wideband echo signal:
- De=Ee/BWe.
A method for measuring a characteristic loop sensitivity for an acoustic transducer, the measuring step comprising:
- generating a pulse to create a wideband signal as a reference signal;
- obtaining a wideband reference signal Vr(t);
- obtaining a function {circumflex over (V)}r(f) that is a Fourier Transform of the wideband reference signal Vr(t);
- obtaining an energy spectrum of wideband reference signal based on the function {circumflex over (V)}r(f);
- calculating a bandwidth of reference signal (BWr) at a designated decibel for the energy spectrum of wideband reference signal;
- calculating an energy of reference signal (Er) for the wideband reference signal Vr(t);
- calculating an energy density of reference signal (Dr) for the wideband reference signal:
- Dr=Er/BWr;
- generating a wideband acoustic wave from the acoustic transducer;
- obtaining a wideband echo signal Ve(t) after the wideband acoustic wave being reflected from an acoustic mirror;
- obtaining a function {circumflex over (V)}r(f) that is a Fourier Transform of the wideband echo signal Ve(t);
- obtaining an energy spectrum of wideband echo signal based on the function {circumflex over (V)}re(f);
- calculating a bandwidth of echo signal (BWe) at a designated decibel for the energy spectrum of wideband echo signal;
- calculating an energy of echo signal (Ee) for the wideband echo signal Ve(t);
- calculating an energy density of echo signal (De) for the wideband echo signal:
- De=Ee/BWe;
- and
- defining a characteristic loop sensitivity (SLC) for the acoustic transducer:
- S
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- def
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A system for measuring a characteristic loop sensitivity for an acoustic transducer, comprises:
- a pulse generator electrically coupled to the acoustic transducer for generating a pulse to create a wideband acoustic wave;
- and
- a control unit electrically coupled to the pulse generator.
Dependencies are inferred from the claim text.