Detection method and device of resonance frequency of ultrasonic transducer and ultrasonic transducer
A technology of ultrasonic transducer and resonant frequency, applied in the direction of measuring ultrasonic/sound wave/infrasonic wave, measuring device, adopting electrical device, etc., to achieve the effect of small error and easy determination of error range
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Embodiment 1
[0031] According to the first aspect of the present invention, this embodiment provides a method for detecting the resonance frequency of an ultrasonic transducer, see figure 1 , the detection method comprises the following specific steps:
[0032] S11, during the frequency sweeping process, detecting the change state of the current value of the excitation signal output loop in the ultrasonic transducer.
[0033] In this step, the excitation signal output loop (hereinafter also referred to as: loop or output loop) refers to the excitation power output system that transmits the excitation signal to the electric energy storage element in the ultrasonic transducer to cause the electric field or magnetic field to change and generate vibration.
[0034] Among them, if the operating frequency of the ultrasonic transducer is the resonant frequency, the performance of the entire ultrasonic system is the best, so how to accurately find the resonant frequency of the ultrasonic transduce...
Embodiment 2
[0050] According to the first aspect of the present invention, it can be seen that the method of gradually increasing the output frequency of the excitation signal from low to high can better protect the ultrasonic transducer, which is a preferred implementation mode, so this embodiment will combine the frequency sweep process and figure 1 The described method, more specifically a detection method for the resonance frequency of an ultrasonic transducer, is given in image 3 , the detection method comprises the following specific steps:
[0051] S21. Determine the range of the frequency sweep, and start the frequency sweep from a low frequency point.
[0052] Wherein, the real resonance frequency of the ultrasonic transducer should be within the range of the set frequency sweep.
[0053] S22. Gradually increase the range of the frequency sweep.
[0054] S23, sampling the current value of the excitation signal output loop.
[0055] S24, judging whether the current has an upwa...
Embodiment 3
[0069] According to the second aspect of the present invention, this embodiment also provides a detection device for the resonant frequency of the transducer, see Figure 4 , the detection device 300 includes a frequency sweep module 310, a first frequency detection module 320 and a second frequency detection module 330, wherein the frequency sweep module 310 is used to detect where the excitation signal in the ultrasonic transducer is during the frequency sweep process The current value change state of the loop; the first frequency detection module 320 is used to determine the first frequency value when the ultrasonic transducer works to the anti-resonance point according to the current value change state; the second frequency detection module 330 is used to A second frequency value is calculated according to the preset bandwidth of the ultrasonic transducer and the first frequency value, and the second frequency value is used as the working frequency of the ultrasonic transdu...
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